[libc-commits] [libc] e5a743c - Add implementations of POSIX mmap and munmap functions.

Siva Chandra Reddy via libc-commits libc-commits at lists.llvm.org
Mon Dec 23 14:07:46 PST 2019 

Author: Siva Chandra Reddy
Date: 2019-12-23T14:04:02-08:00
New Revision: e5a743c4f6e3639ba3bee778c894a996ef96391a

URL: https://github.com/llvm/llvm-project/commit/e5a743c4f6e3639ba3bee778c894a996ef96391a
DIFF: https://github.com/llvm/llvm-project/commit/e5a743c4f6e3639ba3bee778c894a996ef96391a.diff

LOG: Add implementations of POSIX mmap and munmap functions.

Summary:
A set of of linux x86_64 internal syscall helpers have also been added.

This change does not try to be perfect with respect to OS and machine
abstractions. A TODO note has been added at places where such abstractions
would help and make the arrangement scalable and cleaner. Addressing the
TODOs and building such abstractions is not in the scope of this change.
It is hoped that follow up changes cleaning up the problem areas and
addressing the TODOs will better illustrate the need for the changes.

This change also does not try to imitate mmap and munmap implementations
of other libcs. The idea here is to put in the bare minimum required to
obtain a working mmap and munmap, and then add the rest of the
functionality on an as needed basis.

Reviewers: abrachet, phosek, stanshebs, theraven

Subscribers: mgorny, MaskRay, jfb, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D71634

Added: 
    libc/config/CMakeLists.txt
    libc/config/linux/CMakeLists.txt
    libc/config/linux/platfrom_defs.h.inc
    libc/config/linux/syscall_numbers.h.inc
    libc/config/linux/x86_64/CMakeLists.txt
    libc/config/linux/x86_64/syscall.h.inc
    libc/config/linux/x86_64/syscall_test.cpp
    libc/include/__posix-types.h
    libc/include/sys/mman.h.def
    libc/include/sys/syscall.h.def
    libc/src/sys/CMakeLists.txt
    libc/src/sys/mman/CMakeLists.txt
    libc/src/sys/mman/mmap.cpp
    libc/src/sys/mman/mmap.h
    libc/src/sys/mman/mmap_test.cpp
    libc/src/sys/mman/munmap.cpp
    libc/src/sys/mman/munmap.h
    libc/src/unistd/CMakeLists.txt
    libc/src/unistd/syscall.h.def

Modified: 
    libc/CMakeLists.txt
    libc/cmake/modules/LLVMLibCRules.cmake
    libc/config/linux/api.td
    libc/include/CMakeLists.txt
    libc/lib/CMakeLists.txt
    libc/spec/linux.td
    libc/spec/posix.td
    libc/spec/spec.td
    libc/spec/stdc.td
    libc/src/CMakeLists.txt
    libc/src/__support/CMakeLists.txt
    libc/src/__support/common.h.def

Removed: 
    libc/src/__support/linux/entrypoint_macro.h.inc


################################################################################
diff  --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index eb6812b82586..d07646d7701f 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -19,7 +19,8 @@ set(LIBC_TARGET_MACHINE ${CMAKE_SYSTEM_PROCESSOR})
 include(CMakeParseArguments)
 include(LLVMLibCRules)
 
-add_subdirectory(include)
 add_subdirectory(src)
+add_subdirectory(config)
+add_subdirectory(include)
 add_subdirectory(lib)
 add_subdirectory(utils)

diff  --git a/libc/cmake/modules/LLVMLibCRules.cmake b/libc/cmake/modules/LLVMLibCRules.cmake
index 2ea727ea2111..ae186c59bde1 100644
--- a/libc/cmake/modules/LLVMLibCRules.cmake
+++ b/libc/cmake/modules/LLVMLibCRules.cmake
@@ -250,7 +250,7 @@ function(add_redirector_object target_name)
   )
 endfunction(add_redirector_object)
 
-# Rule to build a shared library of redirector objects
+# Rule to build a shared library of redirector objects.
 function(add_redirector_library target_name)
   cmake_parse_arguments(
     "REDIRECTOR_LIBRARY"
@@ -287,6 +287,15 @@ function(add_redirector_library target_name)
   )
 endfunction(add_redirector_library)
 
+# Rule to add a gtest unittest.
+# Usage
+#    add_libc_unittest(
+#      <target name>
+#      SUITE <name of the suite this test belongs to>
+#      SRCS  <list of .cpp files for the test>
+#      HDRS  <list of .h files for the test>
+#      DEPENDS <list of dependencies>
+#    )
 function(add_libc_unittest target_name)
   if(NOT LLVM_INCLUDE_TESTS)
     return()
@@ -306,15 +315,19 @@ function(add_libc_unittest target_name)
     message(FATAL_ERROR "'add_libc_unittest' target requires a DEPENDS list of 'add_entrypoint_object' targets.")
   endif()
 
-  set(entrypoint_objects "")
+  set(library_deps "")
   foreach(dep IN LISTS LIBC_UNITTEST_DEPENDS)
     get_target_property(dep_type ${dep} "TARGET_TYPE")
-    string(COMPARE EQUAL ${dep_type} ${ENTRYPOINT_OBJ_TARGET_TYPE} dep_is_entrypoint)
-    if(NOT dep_is_entrypoint)
-      message(FATAL_ERROR "Dependency '${dep}' of 'add_entrypoint_unittest' is not an 'add_entrypoint_object' target.")
+    if (dep_type)
+      string(COMPARE EQUAL ${dep_type} ${ENTRYPOINT_OBJ_TARGET_TYPE} dep_is_entrypoint)
+      if(dep_is_entrypoint)
+        get_target_property(obj_file ${dep} "OBJECT_FILE_RAW")
+        list(APPEND library_deps ${obj_file})
+        continue()
+      endif()
     endif()
-    get_target_property(obj_file ${dep} "OBJECT_FILE_RAW")
-    list(APPEND entrypoint_objects "${obj_file}")
+    # TODO: Check if the dep is a normal CMake library target. If yes, then add it
+    # to the list of library_deps.
   endforeach(dep)
 
   add_executable(
@@ -329,8 +342,13 @@ function(add_libc_unittest target_name)
       ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest/include
       ${LLVM_MAIN_SRC_DIR}/utils/unittest/googlemock/include
       ${LIBC_SOURCE_DIR}
+      ${LIBC_BUILD_DIR}
   )
-  target_link_libraries(${target_name} PRIVATE ${entrypoint_objects} gtest_main gtest)
+
+  if(library_deps)
+    target_link_libraries(${target_name} PRIVATE ${library_deps})
+  endif()
+
   set_target_properties(${target_name} PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
 
   add_dependencies(
@@ -338,6 +356,9 @@ function(add_libc_unittest target_name)
     ${LIBC_UNITTEST_DEPENDS}
     gtest
   )
+
+  target_link_libraries(${target_name} PRIVATE gtest_main gtest)
+
   add_custom_command(
     TARGET ${target_name}
     POST_BUILD

diff  --git a/libc/config/CMakeLists.txt b/libc/config/CMakeLists.txt
new file mode 100644
index 000000000000..a1034f995474
--- /dev/null
+++ b/libc/config/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(linux)

diff  --git a/libc/config/linux/CMakeLists.txt b/libc/config/linux/CMakeLists.txt
new file mode 100644
index 000000000000..7e2608e595f5
--- /dev/null
+++ b/libc/config/linux/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(x86_64)

diff  --git a/libc/config/linux/api.td b/libc/config/linux/api.td
index 7568620b7000..8376eefb3ac9 100644
--- a/libc/config/linux/api.td
+++ b/libc/config/linux/api.td
@@ -4,18 +4,6 @@ include "spec/linux.td"
 include "spec/posix.td"
 include "spec/stdc.td"
 
-def FloatT : TypeDecl<"float_t"> {
-  let Decl = [{
-    #if __FLT_EVAL_METHOD__ == 1
-      typedef float float_t
-    #elif __FLT_EVAL_METHOD__ == 2
-      ...
-    #else
-      ...
-    #endif
-  }]; // This is only an example and not exactly how it will appear
-}
-
 def SizeT : TypeDecl<"size_t"> {
   let Decl = [{
     #define __need_size_t
@@ -23,6 +11,13 @@ def SizeT : TypeDecl<"size_t"> {
   }];
 }
 
+def OffT : TypeDecl<"off_t"> {
+  let Decl = [{
+    #define __need_off_t
+    #include <__posix-types.h>
+  }];
+}
+
 def NullMacro : MacroDef<"NULL"> {
   let Defn = [{
     #define __need_NULL
@@ -42,10 +37,6 @@ def MathAPI : PublicAPI<"math.h"> {
    "acos",
    "acosl",
   ];
-
-  let TypeDeclarations = [
-    FloatT,
-  ];
 }
 
 def StringAPI : PublicAPI<"string.h"> {
@@ -111,3 +102,34 @@ def ErrnoAPI : PublicAPI<"errno.h"> {
     MacroDefineIfNot<"EHWPOISON", "133">,
   ];
 }
+
+def SysMManAPI : PublicAPI<"sys/mman.h"> {
+  let Macros = [
+    SimpleMacroDef<"PROT_NONE", "0">,
+    SimpleMacroDef<"PROT_READ", "1">,
+    SimpleMacroDef<"PROT_WRITE", "2">,
+    SimpleMacroDef<"PROT_EXEC", "4">,
+
+    SimpleMacroDef<"MAP_FIXED", "1">,
+    SimpleMacroDef<"MAP_PRIVATE", "2">,
+    SimpleMacroDef<"MAP_SHARED", "4">,
+
+    SimpleMacroDef<"MAP_FAILED", "((void*)-1)">,
+
+    // TODO: The value of 0x20 is good for x86_64, but has to be extended
+    // in some manner to accommodate other machine architectures.
+    SimpleMacroDef<"MAP_ANONYMOUS", "0x20">
+
+    // TODO: Add other MAP_* macros used by Linux.
+  ];
+
+  let TypeDeclarations = [
+    SizeT,
+    OffT,
+  ];
+
+  let Functions = [
+    "mmap",
+    "munmap",
+  ];
+}

diff  --git a/libc/src/__support/linux/entrypoint_macro.h.inc b/libc/config/linux/platfrom_defs.h.inc
similarity index 54%
rename from libc/src/__support/linux/entrypoint_macro.h.inc
rename to libc/config/linux/platfrom_defs.h.inc
index 8f873f90b486..19bf3f7593c1 100644
--- a/libc/src/__support/linux/entrypoint_macro.h.inc
+++ b/libc/config/linux/platfrom_defs.h.inc
@@ -1,4 +1,4 @@
-//===---- Definition of LLVM_LIBC_ENTRYPOINT macro for ELF paltforms ----*-===//
+//===----- Definition of platform specific macros for ELF paltforms -------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -11,3 +11,9 @@
 #define ENTRYPOINT_SECTION_ATTRIBUTE(name) \
     __attribute__((section(".llvm.libc.entrypoint."#name)))
 #define LLVM_LIBC_ENTRYPOINT(name) ENTRYPOINT_SECTION_ATTRIBUTE(name) name
+
+// TODO: Get rid of the PAGE_SIZE macro. It is present only as an interim
+// measure until we can move the implementations of mmap and munmap to under
+// the config/linux directory. After that, the implementations can use
+// EXEC_PAGESIZE until page size can be read from the aux vector. 
+#define PAGE_SIZE 4096

diff  --git a/libc/config/linux/syscall_numbers.h.inc b/libc/config/linux/syscall_numbers.h.inc
new file mode 100644
index 000000000000..c5d49b80f51d
--- /dev/null
+++ b/libc/config/linux/syscall_numbers.h.inc
@@ -0,0 +1,2320 @@
+//===---------------------- Linux syscall number macros -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+%%begin()
+
+#include <asm/unistd.h>
+
+#ifdef __NR_FAST_atomic_update
+#define SYS_FAST_atomic_update __NR_FAST_atomic_update
+#endif
+
+#ifdef __NR_FAST_cmpxchg
+#define SYS_FAST_cmpxchg __NR_FAST_cmpxchg
+#endif
+
+#ifdef __NR_FAST_cmpxchg64
+#define SYS_FAST_cmpxchg64 __NR_FAST_cmpxchg64
+#endif
+
+#ifdef __NR__llseek
+#define SYS__llseek __NR__llseek
+#endif
+
+#ifdef __NR__newselect
+#define SYS__newselect __NR__newselect
+#endif
+
+#ifdef __NR__sysctl
+#define SYS__sysctl __NR__sysctl
+#endif
+
+#ifdef __NR_accept
+#define SYS_accept __NR_accept
+#endif
+
+#ifdef __NR_accept4
+#define SYS_accept4 __NR_accept4
+#endif
+
+#ifdef __NR_access
+#define SYS_access __NR_access
+#endif
+
+#ifdef __NR_acct
+#define SYS_acct __NR_acct
+#endif
+
+#ifdef __NR_acl_get
+#define SYS_acl_get __NR_acl_get
+#endif
+
+#ifdef __NR_acl_set
+#define SYS_acl_set __NR_acl_set
+#endif
+
+#ifdef __NR_add_key
+#define SYS_add_key __NR_add_key
+#endif
+
+#ifdef __NR_adjtimex
+#define SYS_adjtimex __NR_adjtimex
+#endif
+
+#ifdef __NR_afs_syscall
+#define SYS_afs_syscall __NR_afs_syscall
+#endif
+
+#ifdef __NR_alarm
+#define SYS_alarm __NR_alarm
+#endif
+
+#ifdef __NR_alloc_hugepages
+#define SYS_alloc_hugepages __NR_alloc_hugepages
+#endif
+
+#ifdef __NR_arch_prctl
+#define SYS_arch_prctl __NR_arch_prctl
+#endif
+
+#ifdef __NR_arm_fadvise64_64
+#define SYS_arm_fadvise64_64 __NR_arm_fadvise64_64
+#endif
+
+#ifdef __NR_arm_sync_file_range
+#define SYS_arm_sync_file_range __NR_arm_sync_file_range
+#endif
+
+#ifdef __NR_atomic_barrier
+#define SYS_atomic_barrier __NR_atomic_barrier
+#endif
+
+#ifdef __NR_atomic_cmpxchg_32
+#define SYS_atomic_cmpxchg_32 __NR_atomic_cmpxchg_32
+#endif
+
+#ifdef __NR_attrctl
+#define SYS_attrctl __NR_attrctl
+#endif
+
+#ifdef __NR_bdflush
+#define SYS_bdflush __NR_bdflush
+#endif
+
+#ifdef __NR_bind
+#define SYS_bind __NR_bind
+#endif
+
+#ifdef __NR_bpf
+#define SYS_bpf __NR_bpf
+#endif
+
+#ifdef __NR_break
+#define SYS_break __NR_break
+#endif
+
+#ifdef __NR_brk
+#define SYS_brk __NR_brk
+#endif
+
+#ifdef __NR_cachectl
+#define SYS_cachectl __NR_cachectl
+#endif
+
+#ifdef __NR_cacheflush
+#define SYS_cacheflush __NR_cacheflush
+#endif
+
+#ifdef __NR_capget
+#define SYS_capget __NR_capget
+#endif
+
+#ifdef __NR_capset
+#define SYS_capset __NR_capset
+#endif
+
+#ifdef __NR_chdir
+#define SYS_chdir __NR_chdir
+#endif
+
+#ifdef __NR_chmod
+#define SYS_chmod __NR_chmod
+#endif
+
+#ifdef __NR_chown
+#define SYS_chown __NR_chown
+#endif
+
+#ifdef __NR_chown32
+#define SYS_chown32 __NR_chown32
+#endif
+
+#ifdef __NR_chroot
+#define SYS_chroot __NR_chroot
+#endif
+
+#ifdef __NR_clock_adjtime
+#define SYS_clock_adjtime __NR_clock_adjtime
+#endif
+
+#ifdef __NR_clock_getres
+#define SYS_clock_getres __NR_clock_getres
+#endif
+
+#ifdef __NR_clock_gettime
+#define SYS_clock_gettime __NR_clock_gettime
+#endif
+
+#ifdef __NR_clock_nanosleep
+#define SYS_clock_nanosleep __NR_clock_nanosleep
+#endif
+
+#ifdef __NR_clock_settime
+#define SYS_clock_settime __NR_clock_settime
+#endif
+
+#ifdef __NR_clone
+#define SYS_clone __NR_clone
+#endif
+
+#ifdef __NR_clone2
+#define SYS_clone2 __NR_clone2
+#endif
+
+#ifdef __NR_close
+#define SYS_close __NR_close
+#endif
+
+#ifdef __NR_cmpxchg_badaddr
+#define SYS_cmpxchg_badaddr __NR_cmpxchg_badaddr
+#endif
+
+#ifdef __NR_connect
+#define SYS_connect __NR_connect
+#endif
+
+#ifdef __NR_copy_file_range
+#define SYS_copy_file_range __NR_copy_file_range
+#endif
+
+#ifdef __NR_creat
+#define SYS_creat __NR_creat
+#endif
+
+#ifdef __NR_create_module
+#define SYS_create_module __NR_create_module
+#endif
+
+#ifdef __NR_delete_module
+#define SYS_delete_module __NR_delete_module
+#endif
+
+#ifdef __NR_dipc
+#define SYS_dipc __NR_dipc
+#endif
+
+#ifdef __NR_dup
+#define SYS_dup __NR_dup
+#endif
+
+#ifdef __NR_dup2
+#define SYS_dup2 __NR_dup2
+#endif
+
+#ifdef __NR_dup3
+#define SYS_dup3 __NR_dup3
+#endif
+
+#ifdef __NR_epoll_create
+#define SYS_epoll_create __NR_epoll_create
+#endif
+
+#ifdef __NR_epoll_create1
+#define SYS_epoll_create1 __NR_epoll_create1
+#endif
+
+#ifdef __NR_epoll_ctl
+#define SYS_epoll_ctl __NR_epoll_ctl
+#endif
+
+#ifdef __NR_epoll_ctl_old
+#define SYS_epoll_ctl_old __NR_epoll_ctl_old
+#endif
+
+#ifdef __NR_epoll_pwait
+#define SYS_epoll_pwait __NR_epoll_pwait
+#endif
+
+#ifdef __NR_epoll_wait
+#define SYS_epoll_wait __NR_epoll_wait
+#endif
+
+#ifdef __NR_epoll_wait_old
+#define SYS_epoll_wait_old __NR_epoll_wait_old
+#endif
+
+#ifdef __NR_eventfd
+#define SYS_eventfd __NR_eventfd
+#endif
+
+#ifdef __NR_eventfd2
+#define SYS_eventfd2 __NR_eventfd2
+#endif
+
+#ifdef __NR_exec_with_loader
+#define SYS_exec_with_loader __NR_exec_with_loader
+#endif
+
+#ifdef __NR_execv
+#define SYS_execv __NR_execv
+#endif
+
+#ifdef __NR_execve
+#define SYS_execve __NR_execve
+#endif
+
+#ifdef __NR_execveat
+#define SYS_execveat __NR_execveat
+#endif
+
+#ifdef __NR_exit
+#define SYS_exit __NR_exit
+#endif
+
+#ifdef __NR_exit_group
+#define SYS_exit_group __NR_exit_group
+#endif
+
+#ifdef __NR_faccessat
+#define SYS_faccessat __NR_faccessat
+#endif
+
+#ifdef __NR_fadvise64
+#define SYS_fadvise64 __NR_fadvise64
+#endif
+
+#ifdef __NR_fadvise64_64
+#define SYS_fadvise64_64 __NR_fadvise64_64
+#endif
+
+#ifdef __NR_fallocate
+#define SYS_fallocate __NR_fallocate
+#endif
+
+#ifdef __NR_fanotify_init
+#define SYS_fanotify_init __NR_fanotify_init
+#endif
+
+#ifdef __NR_fanotify_mark
+#define SYS_fanotify_mark __NR_fanotify_mark
+#endif
+
+#ifdef __NR_fchdir
+#define SYS_fchdir __NR_fchdir
+#endif
+
+#ifdef __NR_fchmod
+#define SYS_fchmod __NR_fchmod
+#endif
+
+#ifdef __NR_fchmodat
+#define SYS_fchmodat __NR_fchmodat
+#endif
+
+#ifdef __NR_fchown
+#define SYS_fchown __NR_fchown
+#endif
+
+#ifdef __NR_fchown32
+#define SYS_fchown32 __NR_fchown32
+#endif
+
+#ifdef __NR_fchownat
+#define SYS_fchownat __NR_fchownat
+#endif
+
+#ifdef __NR_fcntl
+#define SYS_fcntl __NR_fcntl
+#endif
+
+#ifdef __NR_fcntl64
+#define SYS_fcntl64 __NR_fcntl64
+#endif
+
+#ifdef __NR_fdatasync
+#define SYS_fdatasync __NR_fdatasync
+#endif
+
+#ifdef __NR_fgetxattr
+#define SYS_fgetxattr __NR_fgetxattr
+#endif
+
+#ifdef __NR_finit_module
+#define SYS_finit_module __NR_finit_module
+#endif
+
+#ifdef __NR_flistxattr
+#define SYS_flistxattr __NR_flistxattr
+#endif
+
+#ifdef __NR_flock
+#define SYS_flock __NR_flock
+#endif
+
+#ifdef __NR_fork
+#define SYS_fork __NR_fork
+#endif
+
+#ifdef __NR_free_hugepages
+#define SYS_free_hugepages __NR_free_hugepages
+#endif
+
+#ifdef __NR_fremovexattr
+#define SYS_fremovexattr __NR_fremovexattr
+#endif
+
+#ifdef __NR_fsetxattr
+#define SYS_fsetxattr __NR_fsetxattr
+#endif
+
+#ifdef __NR_fstat
+#define SYS_fstat __NR_fstat
+#endif
+
+#ifdef __NR_fstat64
+#define SYS_fstat64 __NR_fstat64
+#endif
+
+#ifdef __NR_fstatat64
+#define SYS_fstatat64 __NR_fstatat64
+#endif
+
+#ifdef __NR_fstatfs
+#define SYS_fstatfs __NR_fstatfs
+#endif
+
+#ifdef __NR_fstatfs64
+#define SYS_fstatfs64 __NR_fstatfs64
+#endif
+
+#ifdef __NR_fsync
+#define SYS_fsync __NR_fsync
+#endif
+
+#ifdef __NR_ftime
+#define SYS_ftime __NR_ftime
+#endif
+
+#ifdef __NR_ftruncate
+#define SYS_ftruncate __NR_ftruncate
+#endif
+
+#ifdef __NR_ftruncate64
+#define SYS_ftruncate64 __NR_ftruncate64
+#endif
+
+#ifdef __NR_futex
+#define SYS_futex __NR_futex
+#endif
+
+#ifdef __NR_futimesat
+#define SYS_futimesat __NR_futimesat
+#endif
+
+#ifdef __NR_get_kernel_syms
+#define SYS_get_kernel_syms __NR_get_kernel_syms
+#endif
+
+#ifdef __NR_get_mempolicy
+#define SYS_get_mempolicy __NR_get_mempolicy
+#endif
+
+#ifdef __NR_get_robust_list
+#define SYS_get_robust_list __NR_get_robust_list
+#endif
+
+#ifdef __NR_get_thread_area
+#define SYS_get_thread_area __NR_get_thread_area
+#endif
+
+#ifdef __NR_getcpu
+#define SYS_getcpu __NR_getcpu
+#endif
+
+#ifdef __NR_getcwd
+#define SYS_getcwd __NR_getcwd
+#endif
+
+#ifdef __NR_getdents
+#define SYS_getdents __NR_getdents
+#endif
+
+#ifdef __NR_getdents64
+#define SYS_getdents64 __NR_getdents64
+#endif
+
+#ifdef __NR_getdomainname
+#define SYS_getdomainname __NR_getdomainname
+#endif
+
+#ifdef __NR_getdtablesize
+#define SYS_getdtablesize __NR_getdtablesize
+#endif
+
+#ifdef __NR_getegid
+#define SYS_getegid __NR_getegid
+#endif
+
+#ifdef __NR_getegid32
+#define SYS_getegid32 __NR_getegid32
+#endif
+
+#ifdef __NR_geteuid
+#define SYS_geteuid __NR_geteuid
+#endif
+
+#ifdef __NR_geteuid32
+#define SYS_geteuid32 __NR_geteuid32
+#endif
+
+#ifdef __NR_getgid
+#define SYS_getgid __NR_getgid
+#endif
+
+#ifdef __NR_getgid32
+#define SYS_getgid32 __NR_getgid32
+#endif
+
+#ifdef __NR_getgroups
+#define SYS_getgroups __NR_getgroups
+#endif
+
+#ifdef __NR_getgroups32
+#define SYS_getgroups32 __NR_getgroups32
+#endif
+
+#ifdef __NR_gethostname
+#define SYS_gethostname __NR_gethostname
+#endif
+
+#ifdef __NR_getitimer
+#define SYS_getitimer __NR_getitimer
+#endif
+
+#ifdef __NR_getpagesize
+#define SYS_getpagesize __NR_getpagesize
+#endif
+
+#ifdef __NR_getpeername
+#define SYS_getpeername __NR_getpeername
+#endif
+
+#ifdef __NR_getpgid
+#define SYS_getpgid __NR_getpgid
+#endif
+
+#ifdef __NR_getpgrp
+#define SYS_getpgrp __NR_getpgrp
+#endif
+
+#ifdef __NR_getpid
+#define SYS_getpid __NR_getpid
+#endif
+
+#ifdef __NR_getpmsg
+#define SYS_getpmsg __NR_getpmsg
+#endif
+
+#ifdef __NR_getppid
+#define SYS_getppid __NR_getppid
+#endif
+
+#ifdef __NR_getpriority
+#define SYS_getpriority __NR_getpriority
+#endif
+
+#ifdef __NR_getrandom
+#define SYS_getrandom __NR_getrandom
+#endif
+
+#ifdef __NR_getresgid
+#define SYS_getresgid __NR_getresgid
+#endif
+
+#ifdef __NR_getresgid32
+#define SYS_getresgid32 __NR_getresgid32
+#endif
+
+#ifdef __NR_getresuid
+#define SYS_getresuid __NR_getresuid
+#endif
+
+#ifdef __NR_getresuid32
+#define SYS_getresuid32 __NR_getresuid32
+#endif
+
+#ifdef __NR_getrlimit
+#define SYS_getrlimit __NR_getrlimit
+#endif
+
+#ifdef __NR_getrusage
+#define SYS_getrusage __NR_getrusage
+#endif
+
+#ifdef __NR_getsid
+#define SYS_getsid __NR_getsid
+#endif
+
+#ifdef __NR_getsockname
+#define SYS_getsockname __NR_getsockname
+#endif
+
+#ifdef __NR_getsockopt
+#define SYS_getsockopt __NR_getsockopt
+#endif
+
+#ifdef __NR_gettid
+#define SYS_gettid __NR_gettid
+#endif
+
+#ifdef __NR_gettimeofday
+#define SYS_gettimeofday __NR_gettimeofday
+#endif
+
+#ifdef __NR_getuid
+#define SYS_getuid __NR_getuid
+#endif
+
+#ifdef __NR_getuid32
+#define SYS_getuid32 __NR_getuid32
+#endif
+
+#ifdef __NR_getunwind
+#define SYS_getunwind __NR_getunwind
+#endif
+
+#ifdef __NR_getxattr
+#define SYS_getxattr __NR_getxattr
+#endif
+
+#ifdef __NR_getxgid
+#define SYS_getxgid __NR_getxgid
+#endif
+
+#ifdef __NR_getxpid
+#define SYS_getxpid __NR_getxpid
+#endif
+
+#ifdef __NR_getxuid
+#define SYS_getxuid __NR_getxuid
+#endif
+
+#ifdef __NR_gtty
+#define SYS_gtty __NR_gtty
+#endif
+
+#ifdef __NR_idle
+#define SYS_idle __NR_idle
+#endif
+
+#ifdef __NR_init_module
+#define SYS_init_module __NR_init_module
+#endif
+
+#ifdef __NR_inotify_add_watch
+#define SYS_inotify_add_watch __NR_inotify_add_watch
+#endif
+
+#ifdef __NR_inotify_init
+#define SYS_inotify_init __NR_inotify_init
+#endif
+
+#ifdef __NR_inotify_init1
+#define SYS_inotify_init1 __NR_inotify_init1
+#endif
+
+#ifdef __NR_inotify_rm_watch
+#define SYS_inotify_rm_watch __NR_inotify_rm_watch
+#endif
+
+#ifdef __NR_io_cancel
+#define SYS_io_cancel __NR_io_cancel
+#endif
+
+#ifdef __NR_io_destroy
+#define SYS_io_destroy __NR_io_destroy
+#endif
+
+#ifdef __NR_io_getevents
+#define SYS_io_getevents __NR_io_getevents
+#endif
+
+#ifdef __NR_io_pgetevents
+#define SYS_io_pgetevents __NR_io_pgetevents
+#endif
+
+#ifdef __NR_io_setup
+#define SYS_io_setup __NR_io_setup
+#endif
+
+#ifdef __NR_io_submit
+#define SYS_io_submit __NR_io_submit
+#endif
+
+#ifdef __NR_ioctl
+#define SYS_ioctl __NR_ioctl
+#endif
+
+#ifdef __NR_ioperm
+#define SYS_ioperm __NR_ioperm
+#endif
+
+#ifdef __NR_iopl
+#define SYS_iopl __NR_iopl
+#endif
+
+#ifdef __NR_ioprio_get
+#define SYS_ioprio_get __NR_ioprio_get
+#endif
+
+#ifdef __NR_ioprio_set
+#define SYS_ioprio_set __NR_ioprio_set
+#endif
+
+#ifdef __NR_ipc
+#define SYS_ipc __NR_ipc
+#endif
+
+#ifdef __NR_kcmp
+#define SYS_kcmp __NR_kcmp
+#endif
+
+#ifdef __NR_kern_features
+#define SYS_kern_features __NR_kern_features
+#endif
+
+#ifdef __NR_kexec_file_load
+#define SYS_kexec_file_load __NR_kexec_file_load
+#endif
+
+#ifdef __NR_kexec_load
+#define SYS_kexec_load __NR_kexec_load
+#endif
+
+#ifdef __NR_keyctl
+#define SYS_keyctl __NR_keyctl
+#endif
+
+#ifdef __NR_kill
+#define SYS_kill __NR_kill
+#endif
+
+#ifdef __NR_lchown
+#define SYS_lchown __NR_lchown
+#endif
+
+#ifdef __NR_lchown32
+#define SYS_lchown32 __NR_lchown32
+#endif
+
+#ifdef __NR_lgetxattr
+#define SYS_lgetxattr __NR_lgetxattr
+#endif
+
+#ifdef __NR_link
+#define SYS_link __NR_link
+#endif
+
+#ifdef __NR_linkat
+#define SYS_linkat __NR_linkat
+#endif
+
+#ifdef __NR_listen
+#define SYS_listen __NR_listen
+#endif
+
+#ifdef __NR_listxattr
+#define SYS_listxattr __NR_listxattr
+#endif
+
+#ifdef __NR_llistxattr
+#define SYS_llistxattr __NR_llistxattr
+#endif
+
+#ifdef __NR_llseek
+#define SYS_llseek __NR_llseek
+#endif
+
+#ifdef __NR_lock
+#define SYS_lock __NR_lock
+#endif
+
+#ifdef __NR_lookup_dcookie
+#define SYS_lookup_dcookie __NR_lookup_dcookie
+#endif
+
+#ifdef __NR_lremovexattr
+#define SYS_lremovexattr __NR_lremovexattr
+#endif
+
+#ifdef __NR_lseek
+#define SYS_lseek __NR_lseek
+#endif
+
+#ifdef __NR_lsetxattr
+#define SYS_lsetxattr __NR_lsetxattr
+#endif
+
+#ifdef __NR_lstat
+#define SYS_lstat __NR_lstat
+#endif
+
+#ifdef __NR_lstat64
+#define SYS_lstat64 __NR_lstat64
+#endif
+
+#ifdef __NR_madvise
+#define SYS_madvise __NR_madvise
+#endif
+
+#ifdef __NR_mbind
+#define SYS_mbind __NR_mbind
+#endif
+
+#ifdef __NR_membarrier
+#define SYS_membarrier __NR_membarrier
+#endif
+
+#ifdef __NR_memfd_create
+#define SYS_memfd_create __NR_memfd_create
+#endif
+
+#ifdef __NR_memory_ordering
+#define SYS_memory_ordering __NR_memory_ordering
+#endif
+
+#ifdef __NR_migrate_pages
+#define SYS_migrate_pages __NR_migrate_pages
+#endif
+
+#ifdef __NR_mincore
+#define SYS_mincore __NR_mincore
+#endif
+
+#ifdef __NR_mkdir
+#define SYS_mkdir __NR_mkdir
+#endif
+
+#ifdef __NR_mkdirat
+#define SYS_mkdirat __NR_mkdirat
+#endif
+
+#ifdef __NR_mknod
+#define SYS_mknod __NR_mknod
+#endif
+
+#ifdef __NR_mknodat
+#define SYS_mknodat __NR_mknodat
+#endif
+
+#ifdef __NR_mlock
+#define SYS_mlock __NR_mlock
+#endif
+
+#ifdef __NR_mlock2
+#define SYS_mlock2 __NR_mlock2
+#endif
+
+#ifdef __NR_mlockall
+#define SYS_mlockall __NR_mlockall
+#endif
+
+#ifdef __NR_mmap
+#define SYS_mmap __NR_mmap
+#endif
+
+#ifdef __NR_mmap2
+#define SYS_mmap2 __NR_mmap2
+#endif
+
+#ifdef __NR_modify_ldt
+#define SYS_modify_ldt __NR_modify_ldt
+#endif
+
+#ifdef __NR_mount
+#define SYS_mount __NR_mount
+#endif
+
+#ifdef __NR_move_pages
+#define SYS_move_pages __NR_move_pages
+#endif
+
+#ifdef __NR_mprotect
+#define SYS_mprotect __NR_mprotect
+#endif
+
+#ifdef __NR_mpx
+#define SYS_mpx __NR_mpx
+#endif
+
+#ifdef __NR_mq_getsetattr
+#define SYS_mq_getsetattr __NR_mq_getsetattr
+#endif
+
+#ifdef __NR_mq_notify
+#define SYS_mq_notify __NR_mq_notify
+#endif
+
+#ifdef __NR_mq_open
+#define SYS_mq_open __NR_mq_open
+#endif
+
+#ifdef __NR_mq_timedreceive
+#define SYS_mq_timedreceive __NR_mq_timedreceive
+#endif
+
+#ifdef __NR_mq_timedsend
+#define SYS_mq_timedsend __NR_mq_timedsend
+#endif
+
+#ifdef __NR_mq_unlink
+#define SYS_mq_unlink __NR_mq_unlink
+#endif
+
+#ifdef __NR_mremap
+#define SYS_mremap __NR_mremap
+#endif
+
+#ifdef __NR_msgctl
+#define SYS_msgctl __NR_msgctl
+#endif
+
+#ifdef __NR_msgget
+#define SYS_msgget __NR_msgget
+#endif
+
+#ifdef __NR_msgrcv
+#define SYS_msgrcv __NR_msgrcv
+#endif
+
+#ifdef __NR_msgsnd
+#define SYS_msgsnd __NR_msgsnd
+#endif
+
+#ifdef __NR_msync
+#define SYS_msync __NR_msync
+#endif
+
+#ifdef __NR_multiplexer
+#define SYS_multiplexer __NR_multiplexer
+#endif
+
+#ifdef __NR_munlock
+#define SYS_munlock __NR_munlock
+#endif
+
+#ifdef __NR_munlockall
+#define SYS_munlockall __NR_munlockall
+#endif
+
+#ifdef __NR_munmap
+#define SYS_munmap __NR_munmap
+#endif
+
+#ifdef __NR_name_to_handle_at
+#define SYS_name_to_handle_at __NR_name_to_handle_at
+#endif
+
+#ifdef __NR_nanosleep
+#define SYS_nanosleep __NR_nanosleep
+#endif
+
+#ifdef __NR_newfstatat
+#define SYS_newfstatat __NR_newfstatat
+#endif
+
+#ifdef __NR_nfsservctl
+#define SYS_nfsservctl __NR_nfsservctl
+#endif
+
+#ifdef __NR_ni_syscall
+#define SYS_ni_syscall __NR_ni_syscall
+#endif
+
+#ifdef __NR_nice
+#define SYS_nice __NR_nice
+#endif
+
+#ifdef __NR_old_adjtimex
+#define SYS_old_adjtimex __NR_old_adjtimex
+#endif
+
+#ifdef __NR_oldfstat
+#define SYS_oldfstat __NR_oldfstat
+#endif
+
+#ifdef __NR_oldlstat
+#define SYS_oldlstat __NR_oldlstat
+#endif
+
+#ifdef __NR_oldolduname
+#define SYS_oldolduname __NR_oldolduname
+#endif
+
+#ifdef __NR_oldstat
+#define SYS_oldstat __NR_oldstat
+#endif
+
+#ifdef __NR_oldumount
+#define SYS_oldumount __NR_oldumount
+#endif
+
+#ifdef __NR_olduname
+#define SYS_olduname __NR_olduname
+#endif
+
+#ifdef __NR_open
+#define SYS_open __NR_open
+#endif
+
+#ifdef __NR_open_by_handle_at
+#define SYS_open_by_handle_at __NR_open_by_handle_at
+#endif
+
+#ifdef __NR_openat
+#define SYS_openat __NR_openat
+#endif
+
+#ifdef __NR_osf_adjtime
+#define SYS_osf_adjtime __NR_osf_adjtime
+#endif
+
+#ifdef __NR_osf_afs_syscall
+#define SYS_osf_afs_syscall __NR_osf_afs_syscall
+#endif
+
+#ifdef __NR_osf_alt_plock
+#define SYS_osf_alt_plock __NR_osf_alt_plock
+#endif
+
+#ifdef __NR_osf_alt_setsid
+#define SYS_osf_alt_setsid __NR_osf_alt_setsid
+#endif
+
+#ifdef __NR_osf_alt_sigpending
+#define SYS_osf_alt_sigpending __NR_osf_alt_sigpending
+#endif
+
+#ifdef __NR_osf_asynch_daemon
+#define SYS_osf_asynch_daemon __NR_osf_asynch_daemon
+#endif
+
+#ifdef __NR_osf_audcntl
+#define SYS_osf_audcntl __NR_osf_audcntl
+#endif
+
+#ifdef __NR_osf_audgen
+#define SYS_osf_audgen __NR_osf_audgen
+#endif
+
+#ifdef __NR_osf_chflags
+#define SYS_osf_chflags __NR_osf_chflags
+#endif
+
+#ifdef __NR_osf_execve
+#define SYS_osf_execve __NR_osf_execve
+#endif
+
+#ifdef __NR_osf_exportfs
+#define SYS_osf_exportfs __NR_osf_exportfs
+#endif
+
+#ifdef __NR_osf_fchflags
+#define SYS_osf_fchflags __NR_osf_fchflags
+#endif
+
+#ifdef __NR_osf_fdatasync
+#define SYS_osf_fdatasync __NR_osf_fdatasync
+#endif
+
+#ifdef __NR_osf_fpathconf
+#define SYS_osf_fpathconf __NR_osf_fpathconf
+#endif
+
+#ifdef __NR_osf_fstat
+#define SYS_osf_fstat __NR_osf_fstat
+#endif
+
+#ifdef __NR_osf_fstatfs
+#define SYS_osf_fstatfs __NR_osf_fstatfs
+#endif
+
+#ifdef __NR_osf_fstatfs64
+#define SYS_osf_fstatfs64 __NR_osf_fstatfs64
+#endif
+
+#ifdef __NR_osf_fuser
+#define SYS_osf_fuser __NR_osf_fuser
+#endif
+
+#ifdef __NR_osf_getaddressconf
+#define SYS_osf_getaddressconf __NR_osf_getaddressconf
+#endif
+
+#ifdef __NR_osf_getdirentries
+#define SYS_osf_getdirentries __NR_osf_getdirentries
+#endif
+
+#ifdef __NR_osf_getdomainname
+#define SYS_osf_getdomainname __NR_osf_getdomainname
+#endif
+
+#ifdef __NR_osf_getfh
+#define SYS_osf_getfh __NR_osf_getfh
+#endif
+
+#ifdef __NR_osf_getfsstat
+#define SYS_osf_getfsstat __NR_osf_getfsstat
+#endif
+
+#ifdef __NR_osf_gethostid
+#define SYS_osf_gethostid __NR_osf_gethostid
+#endif
+
+#ifdef __NR_osf_getitimer
+#define SYS_osf_getitimer __NR_osf_getitimer
+#endif
+
+#ifdef __NR_osf_getlogin
+#define SYS_osf_getlogin __NR_osf_getlogin
+#endif
+
+#ifdef __NR_osf_getmnt
+#define SYS_osf_getmnt __NR_osf_getmnt
+#endif
+
+#ifdef __NR_osf_getrusage
+#define SYS_osf_getrusage __NR_osf_getrusage
+#endif
+
+#ifdef __NR_osf_getsysinfo
+#define SYS_osf_getsysinfo __NR_osf_getsysinfo
+#endif
+
+#ifdef __NR_osf_gettimeofday
+#define SYS_osf_gettimeofday __NR_osf_gettimeofday
+#endif
+
+#ifdef __NR_osf_kloadcall
+#define SYS_osf_kloadcall __NR_osf_kloadcall
+#endif
+
+#ifdef __NR_osf_kmodcall
+#define SYS_osf_kmodcall __NR_osf_kmodcall
+#endif
+
+#ifdef __NR_osf_lstat
+#define SYS_osf_lstat __NR_osf_lstat
+#endif
+
+#ifdef __NR_osf_memcntl
+#define SYS_osf_memcntl __NR_osf_memcntl
+#endif
+
+#ifdef __NR_osf_mincore
+#define SYS_osf_mincore __NR_osf_mincore
+#endif
+
+#ifdef __NR_osf_mount
+#define SYS_osf_mount __NR_osf_mount
+#endif
+
+#ifdef __NR_osf_mremap
+#define SYS_osf_mremap __NR_osf_mremap
+#endif
+
+#ifdef __NR_osf_msfs_syscall
+#define SYS_osf_msfs_syscall __NR_osf_msfs_syscall
+#endif
+
+#ifdef __NR_osf_msleep
+#define SYS_osf_msleep __NR_osf_msleep
+#endif
+
+#ifdef __NR_osf_mvalid
+#define SYS_osf_mvalid __NR_osf_mvalid
+#endif
+
+#ifdef __NR_osf_mwakeup
+#define SYS_osf_mwakeup __NR_osf_mwakeup
+#endif
+
+#ifdef __NR_osf_naccept
+#define SYS_osf_naccept __NR_osf_naccept
+#endif
+
+#ifdef __NR_osf_nfssvc
+#define SYS_osf_nfssvc __NR_osf_nfssvc
+#endif
+
+#ifdef __NR_osf_ngetpeername
+#define SYS_osf_ngetpeername __NR_osf_ngetpeername
+#endif
+
+#ifdef __NR_osf_ngetsockname
+#define SYS_osf_ngetsockname __NR_osf_ngetsockname
+#endif
+
+#ifdef __NR_osf_nrecvfrom
+#define SYS_osf_nrecvfrom __NR_osf_nrecvfrom
+#endif
+
+#ifdef __NR_osf_nrecvmsg
+#define SYS_osf_nrecvmsg __NR_osf_nrecvmsg
+#endif
+
+#ifdef __NR_osf_nsendmsg
+#define SYS_osf_nsendmsg __NR_osf_nsendmsg
+#endif
+
+#ifdef __NR_osf_ntp_adjtime
+#define SYS_osf_ntp_adjtime __NR_osf_ntp_adjtime
+#endif
+
+#ifdef __NR_osf_ntp_gettime
+#define SYS_osf_ntp_gettime __NR_osf_ntp_gettime
+#endif
+
+#ifdef __NR_osf_old_creat
+#define SYS_osf_old_creat __NR_osf_old_creat
+#endif
+
+#ifdef __NR_osf_old_fstat
+#define SYS_osf_old_fstat __NR_osf_old_fstat
+#endif
+
+#ifdef __NR_osf_old_getpgrp
+#define SYS_osf_old_getpgrp __NR_osf_old_getpgrp
+#endif
+
+#ifdef __NR_osf_old_killpg
+#define SYS_osf_old_killpg __NR_osf_old_killpg
+#endif
+
+#ifdef __NR_osf_old_lstat
+#define SYS_osf_old_lstat __NR_osf_old_lstat
+#endif
+
+#ifdef __NR_osf_old_open
+#define SYS_osf_old_open __NR_osf_old_open
+#endif
+
+#ifdef __NR_osf_old_sigaction
+#define SYS_osf_old_sigaction __NR_osf_old_sigaction
+#endif
+
+#ifdef __NR_osf_old_sigblock
+#define SYS_osf_old_sigblock __NR_osf_old_sigblock
+#endif
+
+#ifdef __NR_osf_old_sigreturn
+#define SYS_osf_old_sigreturn __NR_osf_old_sigreturn
+#endif
+
+#ifdef __NR_osf_old_sigsetmask
+#define SYS_osf_old_sigsetmask __NR_osf_old_sigsetmask
+#endif
+
+#ifdef __NR_osf_old_sigvec
+#define SYS_osf_old_sigvec __NR_osf_old_sigvec
+#endif
+
+#ifdef __NR_osf_old_stat
+#define SYS_osf_old_stat __NR_osf_old_stat
+#endif
+
+#ifdef __NR_osf_old_vadvise
+#define SYS_osf_old_vadvise __NR_osf_old_vadvise
+#endif
+
+#ifdef __NR_osf_old_vtrace
+#define SYS_osf_old_vtrace __NR_osf_old_vtrace
+#endif
+
+#ifdef __NR_osf_old_wait
+#define SYS_osf_old_wait __NR_osf_old_wait
+#endif
+
+#ifdef __NR_osf_oldquota
+#define SYS_osf_oldquota __NR_osf_oldquota
+#endif
+
+#ifdef __NR_osf_pathconf
+#define SYS_osf_pathconf __NR_osf_pathconf
+#endif
+
+#ifdef __NR_osf_pid_block
+#define SYS_osf_pid_block __NR_osf_pid_block
+#endif
+
+#ifdef __NR_osf_pid_unblock
+#define SYS_osf_pid_unblock __NR_osf_pid_unblock
+#endif
+
+#ifdef __NR_osf_plock
+#define SYS_osf_plock __NR_osf_plock
+#endif
+
+#ifdef __NR_osf_priocntlset
+#define SYS_osf_priocntlset __NR_osf_priocntlset
+#endif
+
+#ifdef __NR_osf_profil
+#define SYS_osf_profil __NR_osf_profil
+#endif
+
+#ifdef __NR_osf_proplist_syscall
+#define SYS_osf_proplist_syscall __NR_osf_proplist_syscall
+#endif
+
+#ifdef __NR_osf_reboot
+#define SYS_osf_reboot __NR_osf_reboot
+#endif
+
+#ifdef __NR_osf_revoke
+#define SYS_osf_revoke __NR_osf_revoke
+#endif
+
+#ifdef __NR_osf_sbrk
+#define SYS_osf_sbrk __NR_osf_sbrk
+#endif
+
+#ifdef __NR_osf_security
+#define SYS_osf_security __NR_osf_security
+#endif
+
+#ifdef __NR_osf_select
+#define SYS_osf_select __NR_osf_select
+#endif
+
+#ifdef __NR_osf_set_program_attributes
+#define SYS_osf_set_program_attributes __NR_osf_set_program_attributes
+#endif
+
+#ifdef __NR_osf_set_speculative
+#define SYS_osf_set_speculative __NR_osf_set_speculative
+#endif
+
+#ifdef __NR_osf_sethostid
+#define SYS_osf_sethostid __NR_osf_sethostid
+#endif
+
+#ifdef __NR_osf_setitimer
+#define SYS_osf_setitimer __NR_osf_setitimer
+#endif
+
+#ifdef __NR_osf_setlogin
+#define SYS_osf_setlogin __NR_osf_setlogin
+#endif
+
+#ifdef __NR_osf_setsysinfo
+#define SYS_osf_setsysinfo __NR_osf_setsysinfo
+#endif
+
+#ifdef __NR_osf_settimeofday
+#define SYS_osf_settimeofday __NR_osf_settimeofday
+#endif
+
+#ifdef __NR_osf_shmat
+#define SYS_osf_shmat __NR_osf_shmat
+#endif
+
+#ifdef __NR_osf_signal
+#define SYS_osf_signal __NR_osf_signal
+#endif
+
+#ifdef __NR_osf_sigprocmask
+#define SYS_osf_sigprocmask __NR_osf_sigprocmask
+#endif
+
+#ifdef __NR_osf_sigsendset
+#define SYS_osf_sigsendset __NR_osf_sigsendset
+#endif
+
+#ifdef __NR_osf_sigstack
+#define SYS_osf_sigstack __NR_osf_sigstack
+#endif
+
+#ifdef __NR_osf_sigwaitprim
+#define SYS_osf_sigwaitprim __NR_osf_sigwaitprim
+#endif
+
+#ifdef __NR_osf_sstk
+#define SYS_osf_sstk __NR_osf_sstk
+#endif
+
+#ifdef __NR_osf_stat
+#define SYS_osf_stat __NR_osf_stat
+#endif
+
+#ifdef __NR_osf_statfs
+#define SYS_osf_statfs __NR_osf_statfs
+#endif
+
+#ifdef __NR_osf_statfs64
+#define SYS_osf_statfs64 __NR_osf_statfs64
+#endif
+
+#ifdef __NR_osf_subsys_info
+#define SYS_osf_subsys_info __NR_osf_subsys_info
+#endif
+
+#ifdef __NR_osf_swapctl
+#define SYS_osf_swapctl __NR_osf_swapctl
+#endif
+
+#ifdef __NR_osf_swapon
+#define SYS_osf_swapon __NR_osf_swapon
+#endif
+
+#ifdef __NR_osf_syscall
+#define SYS_osf_syscall __NR_osf_syscall
+#endif
+
+#ifdef __NR_osf_sysinfo
+#define SYS_osf_sysinfo __NR_osf_sysinfo
+#endif
+
+#ifdef __NR_osf_table
+#define SYS_osf_table __NR_osf_table
+#endif
+
+#ifdef __NR_osf_uadmin
+#define SYS_osf_uadmin __NR_osf_uadmin
+#endif
+
+#ifdef __NR_osf_usleep_thread
+#define SYS_osf_usleep_thread __NR_osf_usleep_thread
+#endif
+
+#ifdef __NR_osf_uswitch
+#define SYS_osf_uswitch __NR_osf_uswitch
+#endif
+
+#ifdef __NR_osf_utc_adjtime
+#define SYS_osf_utc_adjtime __NR_osf_utc_adjtime
+#endif
+
+#ifdef __NR_osf_utc_gettime
+#define SYS_osf_utc_gettime __NR_osf_utc_gettime
+#endif
+
+#ifdef __NR_osf_utimes
+#define SYS_osf_utimes __NR_osf_utimes
+#endif
+
+#ifdef __NR_osf_utsname
+#define SYS_osf_utsname __NR_osf_utsname
+#endif
+
+#ifdef __NR_osf_wait4
+#define SYS_osf_wait4 __NR_osf_wait4
+#endif
+
+#ifdef __NR_osf_waitid
+#define SYS_osf_waitid __NR_osf_waitid
+#endif
+
+#ifdef __NR_pause
+#define SYS_pause __NR_pause
+#endif
+
+#ifdef __NR_pciconfig_iobase
+#define SYS_pciconfig_iobase __NR_pciconfig_iobase
+#endif
+
+#ifdef __NR_pciconfig_read
+#define SYS_pciconfig_read __NR_pciconfig_read
+#endif
+
+#ifdef __NR_pciconfig_write
+#define SYS_pciconfig_write __NR_pciconfig_write
+#endif
+
+#ifdef __NR_perf_event_open
+#define SYS_perf_event_open __NR_perf_event_open
+#endif
+
+#ifdef __NR_perfctr
+#define SYS_perfctr __NR_perfctr
+#endif
+
+#ifdef __NR_perfmonctl
+#define SYS_perfmonctl __NR_perfmonctl
+#endif
+
+#ifdef __NR_personality
+#define SYS_personality __NR_personality
+#endif
+
+#ifdef __NR_pipe
+#define SYS_pipe __NR_pipe
+#endif
+
+#ifdef __NR_pipe2
+#define SYS_pipe2 __NR_pipe2
+#endif
+
+#ifdef __NR_pivot_root
+#define SYS_pivot_root __NR_pivot_root
+#endif
+
+#ifdef __NR_pkey_alloc
+#define SYS_pkey_alloc __NR_pkey_alloc
+#endif
+
+#ifdef __NR_pkey_free
+#define SYS_pkey_free __NR_pkey_free
+#endif
+
+#ifdef __NR_pkey_mprotect
+#define SYS_pkey_mprotect __NR_pkey_mprotect
+#endif
+
+#ifdef __NR_poll
+#define SYS_poll __NR_poll
+#endif
+
+#ifdef __NR_ppoll
+#define SYS_ppoll __NR_ppoll
+#endif
+
+#ifdef __NR_prctl
+#define SYS_prctl __NR_prctl
+#endif
+
+#ifdef __NR_pread64
+#define SYS_pread64 __NR_pread64
+#endif
+
+#ifdef __NR_preadv
+#define SYS_preadv __NR_preadv
+#endif
+
+#ifdef __NR_preadv2
+#define SYS_preadv2 __NR_preadv2
+#endif
+
+#ifdef __NR_prlimit64
+#define SYS_prlimit64 __NR_prlimit64
+#endif
+
+#ifdef __NR_process_vm_readv
+#define SYS_process_vm_readv __NR_process_vm_readv
+#endif
+
+#ifdef __NR_process_vm_writev
+#define SYS_process_vm_writev __NR_process_vm_writev
+#endif
+
+#ifdef __NR_prof
+#define SYS_prof __NR_prof
+#endif
+
+#ifdef __NR_profil
+#define SYS_profil __NR_profil
+#endif
+
+#ifdef __NR_pselect6
+#define SYS_pselect6 __NR_pselect6
+#endif
+
+#ifdef __NR_ptrace
+#define SYS_ptrace __NR_ptrace
+#endif
+
+#ifdef __NR_putpmsg
+#define SYS_putpmsg __NR_putpmsg
+#endif
+
+#ifdef __NR_pwrite64
+#define SYS_pwrite64 __NR_pwrite64
+#endif
+
+#ifdef __NR_pwritev
+#define SYS_pwritev __NR_pwritev
+#endif
+
+#ifdef __NR_pwritev2
+#define SYS_pwritev2 __NR_pwritev2
+#endif
+
+#ifdef __NR_query_module
+#define SYS_query_module __NR_query_module
+#endif
+
+#ifdef __NR_quotactl
+#define SYS_quotactl __NR_quotactl
+#endif
+
+#ifdef __NR_read
+#define SYS_read __NR_read
+#endif
+
+#ifdef __NR_readahead
+#define SYS_readahead __NR_readahead
+#endif
+
+#ifdef __NR_readdir
+#define SYS_readdir __NR_readdir
+#endif
+
+#ifdef __NR_readlink
+#define SYS_readlink __NR_readlink
+#endif
+
+#ifdef __NR_readlinkat
+#define SYS_readlinkat __NR_readlinkat
+#endif
+
+#ifdef __NR_readv
+#define SYS_readv __NR_readv
+#endif
+
+#ifdef __NR_reboot
+#define SYS_reboot __NR_reboot
+#endif
+
+#ifdef __NR_recv
+#define SYS_recv __NR_recv
+#endif
+
+#ifdef __NR_recvfrom
+#define SYS_recvfrom __NR_recvfrom
+#endif
+
+#ifdef __NR_recvmmsg
+#define SYS_recvmmsg __NR_recvmmsg
+#endif
+
+#ifdef __NR_recvmsg
+#define SYS_recvmsg __NR_recvmsg
+#endif
+
+#ifdef __NR_remap_file_pages
+#define SYS_remap_file_pages __NR_remap_file_pages
+#endif
+
+#ifdef __NR_removexattr
+#define SYS_removexattr __NR_removexattr
+#endif
+
+#ifdef __NR_rename
+#define SYS_rename __NR_rename
+#endif
+
+#ifdef __NR_renameat
+#define SYS_renameat __NR_renameat
+#endif
+
+#ifdef __NR_renameat2
+#define SYS_renameat2 __NR_renameat2
+#endif
+
+#ifdef __NR_request_key
+#define SYS_request_key __NR_request_key
+#endif
+
+#ifdef __NR_restart_syscall
+#define SYS_restart_syscall __NR_restart_syscall
+#endif
+
+#ifdef __NR_rmdir
+#define SYS_rmdir __NR_rmdir
+#endif
+
+#ifdef __NR_rseq
+#define SYS_rseq __NR_rseq
+#endif
+
+#ifdef __NR_rt_sigaction
+#define SYS_rt_sigaction __NR_rt_sigaction
+#endif
+
+#ifdef __NR_rt_sigpending
+#define SYS_rt_sigpending __NR_rt_sigpending
+#endif
+
+#ifdef __NR_rt_sigprocmask
+#define SYS_rt_sigprocmask __NR_rt_sigprocmask
+#endif
+
+#ifdef __NR_rt_sigqueueinfo
+#define SYS_rt_sigqueueinfo __NR_rt_sigqueueinfo
+#endif
+
+#ifdef __NR_rt_sigreturn
+#define SYS_rt_sigreturn __NR_rt_sigreturn
+#endif
+
+#ifdef __NR_rt_sigsuspend
+#define SYS_rt_sigsuspend __NR_rt_sigsuspend
+#endif
+
+#ifdef __NR_rt_sigtimedwait
+#define SYS_rt_sigtimedwait __NR_rt_sigtimedwait
+#endif
+
+#ifdef __NR_rt_tgsigqueueinfo
+#define SYS_rt_tgsigqueueinfo __NR_rt_tgsigqueueinfo
+#endif
+
+#ifdef __NR_rtas
+#define SYS_rtas __NR_rtas
+#endif
+
+#ifdef __NR_s390_guarded_storage
+#define SYS_s390_guarded_storage __NR_s390_guarded_storage
+#endif
+
+#ifdef __NR_s390_pci_mmio_read
+#define SYS_s390_pci_mmio_read __NR_s390_pci_mmio_read
+#endif
+
+#ifdef __NR_s390_pci_mmio_write
+#define SYS_s390_pci_mmio_write __NR_s390_pci_mmio_write
+#endif
+
+#ifdef __NR_s390_runtime_instr
+#define SYS_s390_runtime_instr __NR_s390_runtime_instr
+#endif
+
+#ifdef __NR_s390_sthyi
+#define SYS_s390_sthyi __NR_s390_sthyi
+#endif
+
+#ifdef __NR_sched_get_affinity
+#define SYS_sched_get_affinity __NR_sched_get_affinity
+#endif
+
+#ifdef __NR_sched_get_priority_max
+#define SYS_sched_get_priority_max __NR_sched_get_priority_max
+#endif
+
+#ifdef __NR_sched_get_priority_min
+#define SYS_sched_get_priority_min __NR_sched_get_priority_min
+#endif
+
+#ifdef __NR_sched_getaffinity
+#define SYS_sched_getaffinity __NR_sched_getaffinity
+#endif
+
+#ifdef __NR_sched_getattr
+#define SYS_sched_getattr __NR_sched_getattr
+#endif
+
+#ifdef __NR_sched_getparam
+#define SYS_sched_getparam __NR_sched_getparam
+#endif
+
+#ifdef __NR_sched_getscheduler
+#define SYS_sched_getscheduler __NR_sched_getscheduler
+#endif
+
+#ifdef __NR_sched_rr_get_interval
+#define SYS_sched_rr_get_interval __NR_sched_rr_get_interval
+#endif
+
+#ifdef __NR_sched_set_affinity
+#define SYS_sched_set_affinity __NR_sched_set_affinity
+#endif
+
+#ifdef __NR_sched_setaffinity
+#define SYS_sched_setaffinity __NR_sched_setaffinity
+#endif
+
+#ifdef __NR_sched_setattr
+#define SYS_sched_setattr __NR_sched_setattr
+#endif
+
+#ifdef __NR_sched_setparam
+#define SYS_sched_setparam __NR_sched_setparam
+#endif
+
+#ifdef __NR_sched_setscheduler
+#define SYS_sched_setscheduler __NR_sched_setscheduler
+#endif
+
+#ifdef __NR_sched_yield
+#define SYS_sched_yield __NR_sched_yield
+#endif
+
+#ifdef __NR_seccomp
+#define SYS_seccomp __NR_seccomp
+#endif
+
+#ifdef __NR_security
+#define SYS_security __NR_security
+#endif
+
+#ifdef __NR_select
+#define SYS_select __NR_select
+#endif
+
+#ifdef __NR_semctl
+#define SYS_semctl __NR_semctl
+#endif
+
+#ifdef __NR_semget
+#define SYS_semget __NR_semget
+#endif
+
+#ifdef __NR_semop
+#define SYS_semop __NR_semop
+#endif
+
+#ifdef __NR_semtimedop
+#define SYS_semtimedop __NR_semtimedop
+#endif
+
+#ifdef __NR_send
+#define SYS_send __NR_send
+#endif
+
+#ifdef __NR_sendfile
+#define SYS_sendfile __NR_sendfile
+#endif
+
+#ifdef __NR_sendfile64
+#define SYS_sendfile64 __NR_sendfile64
+#endif
+
+#ifdef __NR_sendmmsg
+#define SYS_sendmmsg __NR_sendmmsg
+#endif
+
+#ifdef __NR_sendmsg
+#define SYS_sendmsg __NR_sendmsg
+#endif
+
+#ifdef __NR_sendto
+#define SYS_sendto __NR_sendto
+#endif
+
+#ifdef __NR_set_mempolicy
+#define SYS_set_mempolicy __NR_set_mempolicy
+#endif
+
+#ifdef __NR_set_robust_list
+#define SYS_set_robust_list __NR_set_robust_list
+#endif
+
+#ifdef __NR_set_thread_area
+#define SYS_set_thread_area __NR_set_thread_area
+#endif
+
+#ifdef __NR_set_tid_address
+#define SYS_set_tid_address __NR_set_tid_address
+#endif
+
+#ifdef __NR_setdomainname
+#define SYS_setdomainname __NR_setdomainname
+#endif
+
+#ifdef __NR_setfsgid
+#define SYS_setfsgid __NR_setfsgid
+#endif
+
+#ifdef __NR_setfsgid32
+#define SYS_setfsgid32 __NR_setfsgid32
+#endif
+
+#ifdef __NR_setfsuid
+#define SYS_setfsuid __NR_setfsuid
+#endif
+
+#ifdef __NR_setfsuid32
+#define SYS_setfsuid32 __NR_setfsuid32
+#endif
+
+#ifdef __NR_setgid
+#define SYS_setgid __NR_setgid
+#endif
+
+#ifdef __NR_setgid32
+#define SYS_setgid32 __NR_setgid32
+#endif
+
+#ifdef __NR_setgroups
+#define SYS_setgroups __NR_setgroups
+#endif
+
+#ifdef __NR_setgroups32
+#define SYS_setgroups32 __NR_setgroups32
+#endif
+
+#ifdef __NR_sethae
+#define SYS_sethae __NR_sethae
+#endif
+
+#ifdef __NR_sethostname
+#define SYS_sethostname __NR_sethostname
+#endif
+
+#ifdef __NR_setitimer
+#define SYS_setitimer __NR_setitimer
+#endif
+
+#ifdef __NR_setns
+#define SYS_setns __NR_setns
+#endif
+
+#ifdef __NR_setpgid
+#define SYS_setpgid __NR_setpgid
+#endif
+
+#ifdef __NR_setpgrp
+#define SYS_setpgrp __NR_setpgrp
+#endif
+
+#ifdef __NR_setpriority
+#define SYS_setpriority __NR_setpriority
+#endif
+
+#ifdef __NR_setregid
+#define SYS_setregid __NR_setregid
+#endif
+
+#ifdef __NR_setregid32
+#define SYS_setregid32 __NR_setregid32
+#endif
+
+#ifdef __NR_setresgid
+#define SYS_setresgid __NR_setresgid
+#endif
+
+#ifdef __NR_setresgid32
+#define SYS_setresgid32 __NR_setresgid32
+#endif
+
+#ifdef __NR_setresuid
+#define SYS_setresuid __NR_setresuid
+#endif
+
+#ifdef __NR_setresuid32
+#define SYS_setresuid32 __NR_setresuid32
+#endif
+
+#ifdef __NR_setreuid
+#define SYS_setreuid __NR_setreuid
+#endif
+
+#ifdef __NR_setreuid32
+#define SYS_setreuid32 __NR_setreuid32
+#endif
+
+#ifdef __NR_setrlimit
+#define SYS_setrlimit __NR_setrlimit
+#endif
+
+#ifdef __NR_setsid
+#define SYS_setsid __NR_setsid
+#endif
+
+#ifdef __NR_setsockopt
+#define SYS_setsockopt __NR_setsockopt
+#endif
+
+#ifdef __NR_settimeofday
+#define SYS_settimeofday __NR_settimeofday
+#endif
+
+#ifdef __NR_setuid
+#define SYS_setuid __NR_setuid
+#endif
+
+#ifdef __NR_setuid32
+#define SYS_setuid32 __NR_setuid32
+#endif
+
+#ifdef __NR_setxattr
+#define SYS_setxattr __NR_setxattr
+#endif
+
+#ifdef __NR_sgetmask
+#define SYS_sgetmask __NR_sgetmask
+#endif
+
+#ifdef __NR_shmat
+#define SYS_shmat __NR_shmat
+#endif
+
+#ifdef __NR_shmctl
+#define SYS_shmctl __NR_shmctl
+#endif
+
+#ifdef __NR_shmdt
+#define SYS_shmdt __NR_shmdt
+#endif
+
+#ifdef __NR_shmget
+#define SYS_shmget __NR_shmget
+#endif
+
+#ifdef __NR_shutdown
+#define SYS_shutdown __NR_shutdown
+#endif
+
+#ifdef __NR_sigaction
+#define SYS_sigaction __NR_sigaction
+#endif
+
+#ifdef __NR_sigaltstack
+#define SYS_sigaltstack __NR_sigaltstack
+#endif
+
+#ifdef __NR_signal
+#define SYS_signal __NR_signal
+#endif
+
+#ifdef __NR_signalfd
+#define SYS_signalfd __NR_signalfd
+#endif
+
+#ifdef __NR_signalfd4
+#define SYS_signalfd4 __NR_signalfd4
+#endif
+
+#ifdef __NR_sigpending
+#define SYS_sigpending __NR_sigpending
+#endif
+
+#ifdef __NR_sigprocmask
+#define SYS_sigprocmask __NR_sigprocmask
+#endif
+
+#ifdef __NR_sigreturn
+#define SYS_sigreturn __NR_sigreturn
+#endif
+
+#ifdef __NR_sigsuspend
+#define SYS_sigsuspend __NR_sigsuspend
+#endif
+
+#ifdef __NR_socket
+#define SYS_socket __NR_socket
+#endif
+
+#ifdef __NR_socketcall
+#define SYS_socketcall __NR_socketcall
+#endif
+
+#ifdef __NR_socketpair
+#define SYS_socketpair __NR_socketpair
+#endif
+
+#ifdef __NR_splice
+#define SYS_splice __NR_splice
+#endif
+
+#ifdef __NR_spu_create
+#define SYS_spu_create __NR_spu_create
+#endif
+
+#ifdef __NR_spu_run
+#define SYS_spu_run __NR_spu_run
+#endif
+
+#ifdef __NR_ssetmask
+#define SYS_ssetmask __NR_ssetmask
+#endif
+
+#ifdef __NR_stat
+#define SYS_stat __NR_stat
+#endif
+
+#ifdef __NR_stat64
+#define SYS_stat64 __NR_stat64
+#endif
+
+#ifdef __NR_statfs
+#define SYS_statfs __NR_statfs
+#endif
+
+#ifdef __NR_statfs64
+#define SYS_statfs64 __NR_statfs64
+#endif
+
+#ifdef __NR_statx
+#define SYS_statx __NR_statx
+#endif
+
+#ifdef __NR_stime
+#define SYS_stime __NR_stime
+#endif
+
+#ifdef __NR_stty
+#define SYS_stty __NR_stty
+#endif
+
+#ifdef __NR_subpage_prot
+#define SYS_subpage_prot __NR_subpage_prot
+#endif
+
+#ifdef __NR_swapcontext
+#define SYS_swapcontext __NR_swapcontext
+#endif
+
+#ifdef __NR_swapoff
+#define SYS_swapoff __NR_swapoff
+#endif
+
+#ifdef __NR_swapon
+#define SYS_swapon __NR_swapon
+#endif
+
+#ifdef __NR_switch_endian
+#define SYS_switch_endian __NR_switch_endian
+#endif
+
+#ifdef __NR_symlink
+#define SYS_symlink __NR_symlink
+#endif
+
+#ifdef __NR_symlinkat
+#define SYS_symlinkat __NR_symlinkat
+#endif
+
+#ifdef __NR_sync
+#define SYS_sync __NR_sync
+#endif
+
+#ifdef __NR_sync_file_range
+#define SYS_sync_file_range __NR_sync_file_range
+#endif
+
+#ifdef __NR_sync_file_range2
+#define SYS_sync_file_range2 __NR_sync_file_range2
+#endif
+
+#ifdef __NR_syncfs
+#define SYS_syncfs __NR_syncfs
+#endif
+
+#ifdef __NR_sys_debug_setcontext
+#define SYS_sys_debug_setcontext __NR_sys_debug_setcontext
+#endif
+
+#ifdef __NR_sys_epoll_create
+#define SYS_sys_epoll_create __NR_sys_epoll_create
+#endif
+
+#ifdef __NR_sys_epoll_ctl
+#define SYS_sys_epoll_ctl __NR_sys_epoll_ctl
+#endif
+
+#ifdef __NR_sys_epoll_wait
+#define SYS_sys_epoll_wait __NR_sys_epoll_wait
+#endif
+
+#ifdef __NR_syscall
+#define SYS_syscall __NR_syscall
+#endif
+
+#ifdef __NR_sysfs
+#define SYS_sysfs __NR_sysfs
+#endif
+
+#ifdef __NR_sysinfo
+#define SYS_sysinfo __NR_sysinfo
+#endif
+
+#ifdef __NR_syslog
+#define SYS_syslog __NR_syslog
+#endif
+
+#ifdef __NR_sysmips
+#define SYS_sysmips __NR_sysmips
+#endif
+
+#ifdef __NR_tee
+#define SYS_tee __NR_tee
+#endif
+
+#ifdef __NR_tgkill
+#define SYS_tgkill __NR_tgkill
+#endif
+
+#ifdef __NR_time
+#define SYS_time __NR_time
+#endif
+
+#ifdef __NR_timer_create
+#define SYS_timer_create __NR_timer_create
+#endif
+
+#ifdef __NR_timer_delete
+#define SYS_timer_delete __NR_timer_delete
+#endif
+
+#ifdef __NR_timer_getoverrun
+#define SYS_timer_getoverrun __NR_timer_getoverrun
+#endif
+
+#ifdef __NR_timer_gettime
+#define SYS_timer_gettime __NR_timer_gettime
+#endif
+
+#ifdef __NR_timer_settime
+#define SYS_timer_settime __NR_timer_settime
+#endif
+
+#ifdef __NR_timerfd
+#define SYS_timerfd __NR_timerfd
+#endif
+
+#ifdef __NR_timerfd_create
+#define SYS_timerfd_create __NR_timerfd_create
+#endif
+
+#ifdef __NR_timerfd_gettime
+#define SYS_timerfd_gettime __NR_timerfd_gettime
+#endif
+
+#ifdef __NR_timerfd_settime
+#define SYS_timerfd_settime __NR_timerfd_settime
+#endif
+
+#ifdef __NR_times
+#define SYS_times __NR_times
+#endif
+
+#ifdef __NR_tkill
+#define SYS_tkill __NR_tkill
+#endif
+
+#ifdef __NR_truncate
+#define SYS_truncate __NR_truncate
+#endif
+
+#ifdef __NR_truncate64
+#define SYS_truncate64 __NR_truncate64
+#endif
+
+#ifdef __NR_tuxcall
+#define SYS_tuxcall __NR_tuxcall
+#endif
+
+#ifdef __NR_ugetrlimit
+#define SYS_ugetrlimit __NR_ugetrlimit
+#endif
+
+#ifdef __NR_ulimit
+#define SYS_ulimit __NR_ulimit
+#endif
+
+#ifdef __NR_umask
+#define SYS_umask __NR_umask
+#endif
+
+#ifdef __NR_umount
+#define SYS_umount __NR_umount
+#endif
+
+#ifdef __NR_umount2
+#define SYS_umount2 __NR_umount2
+#endif
+
+#ifdef __NR_uname
+#define SYS_uname __NR_uname
+#endif
+
+#ifdef __NR_unlink
+#define SYS_unlink __NR_unlink
+#endif
+
+#ifdef __NR_unlinkat
+#define SYS_unlinkat __NR_unlinkat
+#endif
+
+#ifdef __NR_unshare
+#define SYS_unshare __NR_unshare
+#endif
+
+#ifdef __NR_uselib
+#define SYS_uselib __NR_uselib
+#endif
+
+#ifdef __NR_userfaultfd
+#define SYS_userfaultfd __NR_userfaultfd
+#endif
+
+#ifdef __NR_ustat
+#define SYS_ustat __NR_ustat
+#endif
+
+#ifdef __NR_utime
+#define SYS_utime __NR_utime
+#endif
+
+#ifdef __NR_utimensat
+#define SYS_utimensat __NR_utimensat
+#endif
+
+#ifdef __NR_utimes
+#define SYS_utimes __NR_utimes
+#endif
+
+#ifdef __NR_utrap_install
+#define SYS_utrap_install __NR_utrap_install
+#endif
+
+#ifdef __NR_vfork
+#define SYS_vfork __NR_vfork
+#endif
+
+#ifdef __NR_vhangup
+#define SYS_vhangup __NR_vhangup
+#endif
+
+#ifdef __NR_vm86
+#define SYS_vm86 __NR_vm86
+#endif
+
+#ifdef __NR_vm86old
+#define SYS_vm86old __NR_vm86old
+#endif
+
+#ifdef __NR_vmsplice
+#define SYS_vmsplice __NR_vmsplice
+#endif
+
+#ifdef __NR_vserver
+#define SYS_vserver __NR_vserver
+#endif
+
+#ifdef __NR_wait4
+#define SYS_wait4 __NR_wait4
+#endif
+
+#ifdef __NR_waitid
+#define SYS_waitid __NR_waitid
+#endif
+
+#ifdef __NR_waitpid
+#define SYS_waitpid __NR_waitpid
+#endif
+
+#ifdef __NR_write
+#define SYS_write __NR_write
+#endif
+
+#ifdef __NR_writev
+#define SYS_writev __NR_writev
+#endif
+

diff  --git a/libc/config/linux/x86_64/CMakeLists.txt b/libc/config/linux/x86_64/CMakeLists.txt
new file mode 100644
index 000000000000..8ed89823261f
--- /dev/null
+++ b/libc/config/linux/x86_64/CMakeLists.txt
@@ -0,0 +1,10 @@
+add_custom_target(libc_linux_x86_64_unittests)
+
+add_libc_unittest(
+  libc_linux_x86_64_syscall_unittest
+  SUITE libc_linux_x86_64_unittests
+  SRCS syscall_test.cpp
+  DEPENDS
+   syscall_impl_h
+   support_common_h
+)

diff  --git a/libc/config/linux/x86_64/syscall.h.inc b/libc/config/linux/x86_64/syscall.h.inc
new file mode 100644
index 000000000000..944ac99e51a8
--- /dev/null
+++ b/libc/config/linux/x86_64/syscall.h.inc
@@ -0,0 +1,93 @@
+//===------------ inline implementation of x86_64 syscalls --------------*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+%%begin()
+
+#include "src/__support/common.h"
+
+#define SYSCALL_CLOBBER_LIST "rcx", "r11", "memory"
+
+namespace __llvm_libc {
+
+inline long syscall(long __number) {
+  long retcode;
+  LIBC_INLINE_ASM("syscall" :
+             "=a"(retcode) :
+             "a"(__number) :
+             SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+inline long syscall(long __number, long __arg1) {
+  long retcode;
+  LIBC_INLINE_ASM("syscall" :
+             "=a"(retcode) :
+             "a"(__number), "D"(__arg1) :
+             SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+inline long syscall(long __number, long __arg1, long __arg2) {
+  long retcode;
+  LIBC_INLINE_ASM("syscall" :
+             "=a"(retcode) :
+             "a"(__number), "D"(__arg1), "S"(__arg2) :
+             SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+inline long syscall(long __number, long __arg1, long __arg2, long __arg3) {
+  long retcode;
+  LIBC_INLINE_ASM("syscall" :
+             "=a"(retcode) :
+             "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3) :
+             SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+inline long syscall(
+    long __number, long __arg1, long __arg2, long __arg3, long __arg4) {
+  long retcode;
+  register long r10 __asm__("r10") = __arg4;
+  LIBC_INLINE_ASM("syscall" :
+             "=a"(retcode) :
+             "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3), "r"(r10) :
+             SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+inline long syscall(long __number, long __arg1, long __arg2, long __arg3,
+                    long __arg4, long __arg5) {
+  long retcode;
+  register long r10 __asm__("r10") = __arg4;
+  register long r8 __asm__("r8") = __arg5;
+  LIBC_INLINE_ASM(
+      "syscall" :
+      "=a"(retcode) :
+      "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3), "r"(r10), "r"(r8) :
+      SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+inline long syscall(long __number, long __arg1, long __arg2, long __arg3,
+                    long __arg4, long __arg5, long __arg6) {
+  long retcode;
+  register long r10 __asm__("r10") = __arg4;
+  register long r8 __asm__("r8") = __arg5;
+  register long r9 __asm__("r9") = __arg6;
+  LIBC_INLINE_ASM(
+      "syscall" :
+      "=a"(retcode) :
+      "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3), "r"(r10), "r"(r8), "r"(r9) :
+      SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+#undef SYSCALL_CLOBBER_LIST
+
+} // namespace __llvm_libc

diff  --git a/libc/config/linux/x86_64/syscall_test.cpp b/libc/config/linux/x86_64/syscall_test.cpp
new file mode 100644
index 000000000000..6a92142625c6
--- /dev/null
+++ b/libc/config/linux/x86_64/syscall_test.cpp
@@ -0,0 +1,40 @@
+//===------------------ Unittests for x86_64 syscalls ---------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/unistd/syscall.h"
+
+#include "gtest/gtest.h"
+
+#include <functional>
+
+TEST(X86_64_SyscallTest, APITest) {
+  // We only do a signature test here. Actual functionality tests are
+  // done by the unit tests of the syscall wrappers like mmap.
+
+  std::function<long(long)> f([](long n) { return __llvm_libc::syscall(n); });
+  std::function<long(long, long)> f1(
+      [](long n, long a1) { return __llvm_libc::syscall(n, a1); });
+  std::function<long(long, long, long)> f2(
+      [](long n, long a1, long a2) { return __llvm_libc::syscall(n, a1, a2); });
+  std::function<long(long, long, long, long)> f3(
+      [](long n, long a1, long a2, long a3) {
+        return __llvm_libc::syscall(n, a1, a2, a3);
+      });
+  std::function<long(long, long, long, long, long)> f4(
+      [](long n, long a1, long a2, long a3, long a4) {
+        return __llvm_libc::syscall(n, a1, a2, a3, a4);
+      });
+  std::function<long(long, long, long, long, long, long)> f5(
+      [](long n, long a1, long a2, long a3, long a4, long a5) {
+        return __llvm_libc::syscall(n, a1, a2, a3, a4, a5);
+      });
+  std::function<long(long, long, long, long, long, long, long)> f6(
+      [](long n, long a1, long a2, long a3, long a4, long a5, long a6) {
+        return __llvm_libc::syscall(n, a1, a2, a3, a4, a5, a6);
+      });
+}

diff  --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 8d1c53297b1b..7773be6227a3 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -5,6 +5,12 @@ add_header(
     __llvm-libc-common.h
 )
 
+add_header(
+  libc_posix_types_h
+  HDR
+    __posix-types.h
+)
+
 add_header(
   ctype_h
   HDR
@@ -38,3 +44,26 @@ add_gen_header(
   DATA_FILES
     ../config/${LIBC_TARGET_OS}/errno.h.in
 )
+
+# TODO: Not all platforms will have a include/sys directory. Add the sys
+# directory and the targets for sys/*.h files conditional to the OS requiring
+# them.
+file(MAKE_DIRECTORY "sys")
+
+add_gen_header(
+  sys_mman_h
+  DEF_FILE sys/mman.h.def
+  GEN_HDR sys/mman.h
+  DEPENDS
+    libc_posix_types_h
+)
+
+add_gen_header(
+  sys_syscall_h
+  DEF_FILE sys/syscall.h.def
+  GEN_HDR sys/syscall.h
+  PARAMS
+    syscall_numbers=../config/${LIBC_TARGET_OS}/syscall_numbers.h.inc
+  DATA_FILES
+    ../config/${LIBC_TARGET_OS}/syscall_numbers.h.inc
+)

diff  --git a/libc/include/__posix-types.h b/libc/include/__posix-types.h
new file mode 100644
index 000000000000..0cbe623ce27c
--- /dev/null
+++ b/libc/include/__posix-types.h
@@ -0,0 +1,16 @@
+//===----------------- Definitions of common POSIX types ------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// This header file does not have a header guard. It is internal to LLVM libc
+// and intended to be used to pick specific definitions without polluting the
+// public headers with unneccesary definitions.
+
+#if defined(__need_off_t) && !defined(__llvm_libc_off_t_defined)
+typedef __INT64_TYPE__ off_t;
+#define __llvm_libc_off_t_defined
+#endif // __need_off_t

diff  --git a/libc/include/sys/mman.h.def b/libc/include/sys/mman.h.def
new file mode 100644
index 000000000000..d61006661c79
--- /dev/null
+++ b/libc/include/sys/mman.h.def
@@ -0,0 +1,11 @@
+//===------------------------- POSIX header mman.h ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <__llvm-libc-common.h>
+
+%%public_api()

diff  --git a/libc/include/sys/syscall.h.def b/libc/include/sys/syscall.h.def
new file mode 100644
index 000000000000..30ae9f98f274
--- /dev/null
+++ b/libc/include/sys/syscall.h.def
@@ -0,0 +1,12 @@
+//===---------------------- Linux like sys/syscall.h ----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+<!> If syscall.h were a linux only file, then we do not need this indirection.
+<!> However, to keep the option of a non-linux OS requiring a syscall.h file,
+<!> with its own special syscall numbers, we use this indirection.
+%%include_file(${syscall_numbers})

diff  --git a/libc/lib/CMakeLists.txt b/libc/lib/CMakeLists.txt
index dd1975ba8548..7177248c415b 100644
--- a/libc/lib/CMakeLists.txt
+++ b/libc/lib/CMakeLists.txt
@@ -8,6 +8,10 @@ add_entrypoint_library(
     # string.h entrypoints
     strcpy
     strcat
+
+    # sys/mman.h entrypoints
+    mmap
+    munmap
 )
 
 add_entrypoint_library(

diff  --git a/libc/spec/linux.td b/libc/spec/linux.td
index da6812f88104..2e773860d1eb 100644
--- a/libc/spec/linux.td
+++ b/libc/spec/linux.td
@@ -60,7 +60,15 @@ def Linux : StandardSpec<"Linux"> {
       []  // Functions
   >;
 
+  HeaderSpec SysMMan = HeaderSpec<
+      "sys/mman.h",
+      [Macro<"MAP_ANONYMOUS">],
+      [], // Types
+      []  // Functions
+  >;
+
   let Headers = [
     Errno,
+    SysMMan,
   ];
 }

diff  --git a/libc/spec/posix.td b/libc/spec/posix.td
index ce7fd43aa83e..094eaea04ef5 100644
--- a/libc/spec/posix.td
+++ b/libc/spec/posix.td
@@ -1,4 +1,6 @@
 def POSIX : StandardSpec<"POSIX"> {
+  NamedType OffTType = NamedType<"off_t">;
+
   HeaderSpec Errno = HeaderSpec<
       "errno.h",
       [
@@ -85,7 +87,47 @@ def POSIX : StandardSpec<"POSIX"> {
       []  // Functions
   >;
 
+  HeaderSpec SysMMan = HeaderSpec<
+      "sys/mman.h",
+      [
+        // TODO: Add a facility to bunch macros into bitwise-or-able groups.
+        // POSIX requires it, so such thing should be captured in this spec.
+        Macro<"PROT_EXEC">,
+        Macro<"PROT_NONE">,
+        Macro<"PROT_READ">,
+        Macro<"PROT_WRITE">,
+
+        Macro<"MAP_FIXED">,
+        Macro<"MAP_PRIVATE">,
+        Macro<"MAP_SHARED">,
+
+        Macro<"MAP_FAILED">,
+      ],
+      [
+        SizeTType,
+        OffTType,
+      ],
+      [
+        FunctionSpec<
+            "mmap",
+            RetValSpec<VoidPtr>,
+            [ArgSpec<VoidPtr>,
+             ArgSpec<SizeTType>,
+             ArgSpec<IntType>,
+             ArgSpec<IntType>,
+             ArgSpec<IntType>,
+             ArgSpec<OffTType>]
+        >,
+        FunctionSpec<
+            "munmap",
+            RetValSpec<IntType>,
+            [ArgSpec<VoidPtr>, ArgSpec<SizeTType>]
+        >,
+      ]
+  >;
+
   let Headers = [
     Errno,
+    SysMMan,
   ];
 }

diff  --git a/libc/spec/spec.td b/libc/spec/spec.td
index 855dd6aaa772..61c1f899fda7 100644
--- a/libc/spec/spec.td
+++ b/libc/spec/spec.td
@@ -35,6 +35,10 @@ def DoubleType : NamedType<"double">;
 def LongDoubleType : NamedType<"long double">;
 def CharType : NamedType<"char">;
 
+// Common types
+def VoidPtr : PtrType<VoidType>;
+def SizeTType : NamedType<"size_t">;
+
 class Macro<string name> {
   string Name = name;
 }

diff  --git a/libc/spec/stdc.td b/libc/spec/stdc.td
index a17a3872fa27..3f9cdb0de9cb 100644
--- a/libc/spec/stdc.td
+++ b/libc/spec/stdc.td
@@ -1,5 +1,4 @@
 def StdC : StandardSpec<"stdc"> {
-  PtrType VoidPtr = PtrType<VoidType>;
   ConstType ConstVoidPtr = ConstType<VoidPtr>;
   RestrictedPtrType VoidRestrictedPtr = RestrictedPtrType<VoidType>;
   ConstType ConstVoidRestrictedPtr = ConstType<VoidRestrictedPtr>;
@@ -9,8 +8,6 @@ def StdC : StandardSpec<"stdc"> {
   RestrictedPtrType CharRestrictedPtr = RestrictedPtrType<CharType>;
   ConstType ConstCharRestrictedPtr = ConstType<CharRestrictedPtr>;
 
-  NamedType SizeTType = NamedType<"size_t">;
-
   HeaderSpec String = HeaderSpec<
       "string.h",
       [

diff  --git a/libc/src/CMakeLists.txt b/libc/src/CMakeLists.txt
index f9a86af7652a..28084cd9a9be 100644
--- a/libc/src/CMakeLists.txt
+++ b/libc/src/CMakeLists.txt
@@ -1,5 +1,8 @@
 add_subdirectory(errno)
 add_subdirectory(math)
 add_subdirectory(string)
+# TODO: Add this target conditional to the target OS.
+add_subdirectory(sys)
+add_subdirectory(unistd)
 
 add_subdirectory(__support)

diff  --git a/libc/src/__support/CMakeLists.txt b/libc/src/__support/CMakeLists.txt
index a536e9025d7c..1db25102a969 100644
--- a/libc/src/__support/CMakeLists.txt
+++ b/libc/src/__support/CMakeLists.txt
@@ -2,8 +2,8 @@ add_gen_header(
   support_common_h
   DEF_FILE common.h.def
   PARAMS
-    entrypoint_macro=${LIBC_TARGET_OS}/entrypoint_macro.h.inc
+    platform_defs=../../config/${LIBC_TARGET_OS}/platfrom_defs.h.inc
   GEN_HDR common.h
   DATA_FILES
-    ${LIBC_TARGET_OS}/entrypoint_macro.h.inc
+    ../../config/${LIBC_TARGET_OS}/platfrom_defs.h.inc
 )

diff  --git a/libc/src/__support/common.h.def b/libc/src/__support/common.h.def
index b2605a712d87..62f69b86a524 100644
--- a/libc/src/__support/common.h.def
+++ b/libc/src/__support/common.h.def
@@ -9,10 +9,10 @@
 #ifndef LLVM_LIBC_SUPPORT_COMMON_H
 #define LLVM_LIBC_SUPPORT_COMMON_H
 
-#define INLINE_ASM __asm__ __volatile__
+#define LIBC_INLINE_ASM __asm__ __volatile__
 
-<!> The entrypoint macro has a platform specific definition. So, we include the
-<!> right definition at build time.
-%%include_file(${entrypoint_macro})
+<!> Include the platform specific definitions at build time. For example, that
+<!> of entrypoint macro.
+%%include_file(${platform_defs})
 
 #endif // LLVM_LIBC_SUPPORT_COMMON_H

diff  --git a/libc/src/sys/CMakeLists.txt b/libc/src/sys/CMakeLists.txt
new file mode 100644
index 000000000000..03c59bfc4a0b
--- /dev/null
+++ b/libc/src/sys/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(mman)

diff  --git a/libc/src/sys/mman/CMakeLists.txt b/libc/src/sys/mman/CMakeLists.txt
new file mode 100644
index 000000000000..f2d98a455181
--- /dev/null
+++ b/libc/src/sys/mman/CMakeLists.txt
@@ -0,0 +1,41 @@
+#TODO: The sources and target listed here should ideally live in config/linux.
+
+add_entrypoint_object(
+  mmap
+  SRCS
+    mmap.cpp
+  HDRS
+    mmap.h
+  DEPENDS
+    sys_mman_h
+    sys_syscall_h
+    syscall_impl_h
+    __errno_location
+)
+
+add_entrypoint_object(
+  munmap
+  SRCS
+    munmap.cpp
+  HDRS
+    munmap.h
+  DEPENDS
+    sys_mman_h
+    sys_syscall_h
+    syscall_impl_h
+    __errno_location
+)
+
+add_custom_target(libc_sys_mman_unittests)
+
+add_libc_unittest(
+  mmap_test
+  SUITE
+    libc_sys_mman_unittests
+  SRCS
+    mmap_test.cpp
+  DEPENDS
+    mmap
+    munmap
+    __errno_location
+)

diff  --git a/libc/src/sys/mman/mmap.cpp b/libc/src/sys/mman/mmap.cpp
new file mode 100644
index 000000000000..bcf653141760
--- /dev/null
+++ b/libc/src/sys/mman/mmap.cpp
@@ -0,0 +1,57 @@
+//===-------------- Implementation of the POSIX mmap function -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/sys/mman/mmap.h"
+#include "src/__support/common.h"
+#include "src/errno/llvmlibc_errno.h"
+
+#include "src/unistd/syscall.h" // For internal syscall function.
+
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace __llvm_libc {
+
+// This function is currently linux only. It has to be refactored suitably if
+// mmap is to be supported on non-linux operating systems also.
+void *LLVM_LIBC_ENTRYPOINT(mmap)(void *addr, size_t size, int prot, int flags,
+                                 int fd, off_t offset) {
+  // A lot of POSIX standard prescribed validation of the parameters is not
+  // done in this function as modern linux versions do it in the syscall.
+  // TODO: Perform argument validation not done by the linux syscall.
+
+#ifdef SYS_mmap2
+  offset /= PAGE_SIZE;
+  long syscall_number = SYS_mmap2;
+#elif SYS_mmap
+  long syscall_number = SYS_mmap;
+#else
+#error "Target platform does not have SYS_mmap or SYS_mmap2 defined"
+#endif
+
+  long ret_val =
+      __llvm_libc::syscall(syscall_number, reinterpret_cast<long>(addr), size,
+                           prot, flags, fd, offset);
+
+  // The mmap/mmap2 syscalls return negative values on error. These negative
+  // values are actually the negative values of the error codes. So, fix them
+  // up in case an error code is detected.
+  //
+  // A point to keep in mind for the fix up is that a negative return value
+  // from the syscall can also be an error-free value returned by the syscall.
+  // However, since a valid return address cannot be within the last page, a
+  // return value corresponding to a location in the last page is an error
+  // value.
+  if (ret_val < 0 && ret_val > -PAGE_SIZE) {
+    llvmlibc_errno = -ret_val;
+    return MAP_FAILED;
+  }
+
+  return reinterpret_cast<void *>(ret_val);
+}
+
+} // namespace __llvm_libc

diff  --git a/libc/src/sys/mman/mmap.h b/libc/src/sys/mman/mmap.h
new file mode 100644
index 000000000000..f34a5ab76152
--- /dev/null
+++ b/libc/src/sys/mman/mmap.h
@@ -0,0 +1,20 @@
+//===-------------- Implementation header for mmap function ------ *-C++-* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_SYS_MMAN_MMAP_H
+#define LLVM_LIBC_SRC_SYS_MMAN_MMAP_H
+
+#include <sys/mman.h> // For size_t and off_t
+
+namespace __llvm_libc {
+
+void *mmap(void *addr, size_t size, int prot, int flags, int fd, off_t offset);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_SYS_MMAN_MMAP_H

diff  --git a/libc/src/sys/mman/mmap_test.cpp b/libc/src/sys/mman/mmap_test.cpp
new file mode 100644
index 000000000000..ab2e6ceb4a93
--- /dev/null
+++ b/libc/src/sys/mman/mmap_test.cpp
@@ -0,0 +1,48 @@
+//===------------------ Unittests for mmap and munmap ---------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/errno/llvmlibc_errno.h"
+#include "src/sys/mman/mmap.h"
+#include "src/sys/mman/munmap.h"
+
+#include "gtest/gtest.h"
+
+#include "errno.h"
+#include "sys/mman.h"
+
+TEST(MMapTest, NoError) {
+  size_t alloc_size = 128;
+  llvmlibc_errno = 0;
+  void *addr = __llvm_libc::mmap(nullptr, alloc_size, PROT_READ,
+                                 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+  EXPECT_EQ(0, llvmlibc_errno);
+  EXPECT_NE(addr, MAP_FAILED);
+
+  int *array = reinterpret_cast<int *>(addr);
+  // Reading from the memory should not crash the test.
+  // Since we used the MAP_ANONYMOUS flag, the contents of the newly
+  // allocated memory should be initialized to zero.
+  EXPECT_EQ(array[0], 0);
+
+  int ret_val = __llvm_libc::munmap(addr, alloc_size);
+  EXPECT_EQ(0, ret_val);
+  EXPECT_EQ(0, llvmlibc_errno);
+}
+
+TEST(MMapTest, Error_InvalidSize) {
+  llvmlibc_errno = 0;
+  void *addr = __llvm_libc::mmap(nullptr, 0, PROT_READ,
+                                 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+  EXPECT_EQ(EINVAL, llvmlibc_errno);
+  EXPECT_EQ(addr, MAP_FAILED);
+
+  llvmlibc_errno = 0;
+  int ret_val = __llvm_libc::munmap(0, 0);
+  EXPECT_EQ(-1, ret_val);
+  EXPECT_EQ(EINVAL, llvmlibc_errno);
+}

diff  --git a/libc/src/sys/mman/munmap.cpp b/libc/src/sys/mman/munmap.cpp
new file mode 100644
index 000000000000..6a8b4f77769f
--- /dev/null
+++ b/libc/src/sys/mman/munmap.cpp
@@ -0,0 +1,35 @@
+//===------------- Implementation of the POSIX munmap function ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/sys/mman/munmap.h"
+#include "src/__support/common.h"
+#include "src/errno/llvmlibc_errno.h"
+
+#include "src/unistd/syscall.h" // For internal syscall function.
+
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace __llvm_libc {
+
+// This function is currently linux only. It has to be refactored suitably if
+// mmap is to be supported on non-linux operating systems also.
+int LLVM_LIBC_ENTRYPOINT(munmap)(void *addr, size_t size) {
+  long ret_val =
+      __llvm_libc::syscall(SYS_munmap, reinterpret_cast<long>(addr), size);
+
+  // A negative return value indicates an error with the magnitude of the
+  // value being the error code.
+  if (ret_val < 0) {
+    llvmlibc_errno = -ret_val;
+    return -1;
+  }
+
+  return 0;
+}
+
+} // namespace __llvm_libc

diff  --git a/libc/src/sys/mman/munmap.h b/libc/src/sys/mman/munmap.h
new file mode 100644
index 000000000000..2c01cbd87cd7
--- /dev/null
+++ b/libc/src/sys/mman/munmap.h
@@ -0,0 +1,20 @@
+//===-------------- Implementation header for mumap function ----- *-C++-* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_SYS_MMAN_MUNMAP_H
+#define LLVM_LIBC_SRC_SYS_MMAN_MUNMAP_H
+
+#include <sys/mman.h> // For size_t
+
+namespace __llvm_libc {
+
+int munmap(void *addr, size_t size);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_SYS_MMAN_MUNMAP_H

diff  --git a/libc/src/unistd/CMakeLists.txt b/libc/src/unistd/CMakeLists.txt
new file mode 100644
index 000000000000..ed23b704dfe7
--- /dev/null
+++ b/libc/src/unistd/CMakeLists.txt
@@ -0,0 +1,9 @@
+add_gen_header(
+  syscall_impl_h
+  DEF_FILE syscall.h.def
+  GEN_HDR syscall.h
+  PARAMS
+    inline_syscalls=../../config/${LIBC_TARGET_OS}/${LIBC_TARGET_MACHINE}/syscall.h.inc
+  DATA_FILES
+    ../../config/${LIBC_TARGET_OS}/${LIBC_TARGET_MACHINE}/syscall.h.inc
+)

diff  --git a/libc/src/unistd/syscall.h.def b/libc/src/unistd/syscall.h.def
new file mode 100644
index 000000000000..7f52a26ff0e7
--- /dev/null
+++ b/libc/src/unistd/syscall.h.def
@@ -0,0 +1,9 @@
+//===--------------- Internal syscall declarations --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+%%include_file(${inline_syscalls})

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