[libc-commits] [llvm] [libc] [reland][libc] add epoll_wait functions (PR #79635)
via libc-commits
libc-commits at lists.llvm.org
Fri Jan 26 11:05:17 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc
Author: None (michaelrj-google)
<details>
<summary>Changes</summary>
The epoll_wait functions are syscall wrappers that were requested by
upstream users. This patch adds them, as well as their header and types.
The tests are currently incomplete since they require epoll_create to
properly test epoll_wait. That will be added in a followup patch since
this one is already very large.
---
Patch is 28.75 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/79635.diff
34 Files Affected:
- (modified) libc/config/linux/aarch64/entrypoints.txt (+6)
- (modified) libc/config/linux/aarch64/headers.txt (+2)
- (modified) libc/config/linux/api.td (+8-4)
- (modified) libc/config/linux/arm/entrypoints.txt (+7)
- (modified) libc/config/linux/arm/headers.txt (+3)
- (modified) libc/config/linux/riscv/entrypoints.txt (+6)
- (modified) libc/config/linux/riscv/headers.txt (+2)
- (modified) libc/config/linux/syscall_numbers.h.inc (+4)
- (modified) libc/config/linux/x86_64/entrypoints.txt (+5)
- (modified) libc/config/linux/x86_64/headers.txt (+1)
- (modified) libc/include/CMakeLists.txt (+11)
- (modified) libc/include/llvm-libc-types/CMakeLists.txt (+2)
- (added) libc/include/llvm-libc-types/struct_epoll_data.h (+21)
- (added) libc/include/llvm-libc-types/struct_epoll_event.h (+19)
- (added) libc/include/sys/epoll.h.def (+16)
- (modified) libc/spec/gnu_ext.td (+3-1)
- (modified) libc/spec/linux.td (+77)
- (modified) libc/src/sys/CMakeLists.txt (+1)
- (added) libc/src/sys/epoll/CMakeLists.txt (+24)
- (added) libc/src/sys/epoll/epoll_pwait.h (+23)
- (added) libc/src/sys/epoll/epoll_pwait2.h (+24)
- (added) libc/src/sys/epoll/epoll_wait.h (+21)
- (added) libc/src/sys/epoll/linux/CMakeLists.txt (+41)
- (added) libc/src/sys/epoll/linux/epoll_pwait.cpp (+39)
- (added) libc/src/sys/epoll/linux/epoll_pwait2.cpp (+41)
- (added) libc/src/sys/epoll/linux/epoll_wait.cpp (+37)
- (modified) libc/test/src/sys/CMakeLists.txt (+1)
- (added) libc/test/src/sys/epoll/CMakeLists.txt (+3)
- (added) libc/test/src/sys/epoll/linux/CMakeLists.txt (+39)
- (added) libc/test/src/sys/epoll/linux/epoll_pwait2_test.cpp (+20)
- (added) libc/test/src/sys/epoll/linux/epoll_pwait_test.cpp (+20)
- (added) libc/test/src/sys/epoll/linux/epoll_wait_test.cpp (+20)
- (modified) utils/bazel/llvm-project-overlay/libc/BUILD.bazel (+32)
- (added) utils/bazel/llvm-project-overlay/libc/test/src/sys/epoll/BUILD.bazel (+35)
``````````diff
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 52f1d2bce34f4c4..5ad0c12f97b8d84 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -172,6 +172,12 @@ set(TARGET_LIBC_ENTRYPOINTS
# sys/auxv.h entrypoints
libc.src.sys.auxv.getauxval
+ # sys/epoll.h entrypoints
+ # Disabled due to epoll_wait syscalls not being available on this platform.
+ # libc.src.sys.epoll.epoll_wait
+ # libc.src.sys.epoll.epoll_pwait
+ # libc.src.sys.epoll.epoll_pwait2
+
# termios.h entrypoints
libc.src.termios.cfgetispeed
libc.src.termios.cfgetospeed
diff --git a/libc/config/linux/aarch64/headers.txt b/libc/config/linux/aarch64/headers.txt
index 60d978bcaa76e44..f1f0e2e20245c51 100644
--- a/libc/config/linux/aarch64/headers.txt
+++ b/libc/config/linux/aarch64/headers.txt
@@ -24,4 +24,6 @@ set(TARGET_PUBLIC_HEADERS
libc.include.unistd
libc.include.sys_ioctl
+ # Disabled due to epoll_wait syscalls not being available on this platform.
+ # libc.include.sys_epoll
)
diff --git a/libc/config/linux/api.td b/libc/config/linux/api.td
index 85f6b59264eb06d..b8fe16cc0c79ea3 100644
--- a/libc/config/linux/api.td
+++ b/libc/config/linux/api.td
@@ -1,11 +1,11 @@
include "config/public_api.td"
-include "spec/bsd_ext.td"
-include "spec/gnu_ext.td"
+include "spec/stdc.td"
+include "spec/posix.td"
include "spec/linux.td"
+include "spec/gnu_ext.td"
+include "spec/bsd_ext.td"
include "spec/llvm_libc_ext.td"
-include "spec/posix.td"
-include "spec/stdc.td"
def AssertMacro : MacroDef<"assert"> {
let Defn = [{
@@ -242,6 +242,10 @@ def SysUtsNameAPI : PublicAPI<"sys/utsname.h"> {
let Types = ["struct utsname"];
}
+def SysEpollAPI : PublicAPI<"sys/epoll.h"> {
+ let Types = ["struct epoll_event", "struct epoll_data", "sigset_t", "struct timespec"];
+}
+
def SpawnAPI : PublicAPI<"spawn.h"> {
let Types = ["mode_t", "pid_t", "posix_spawnattr_t", "posix_spawn_file_actions_t"];
}
diff --git a/libc/config/linux/arm/entrypoints.txt b/libc/config/linux/arm/entrypoints.txt
index c75ac2302d4ac45..de3411636f7a7a2 100644
--- a/libc/config/linux/arm/entrypoints.txt
+++ b/libc/config/linux/arm/entrypoints.txt
@@ -95,6 +95,13 @@ set(TARGET_LIBC_ENTRYPOINTS
# sys/prctl.h entrypoints
libc.src.sys.prctl.prctl
+
+ # sys/epoll.h entrypoints
+ # Disabled due to epoll_wait syscalls not being available on this platform.
+ # libc.src.sys.epoll.epoll_wait
+ # libc.src.sys.epoll.epoll_pwait
+ # libc.src.sys.epoll.epoll_pwait2
+
)
set(TARGET_LIBM_ENTRYPOINTS
diff --git a/libc/config/linux/arm/headers.txt b/libc/config/linux/arm/headers.txt
index 9e6ee51675916e3..57e26914668c015 100644
--- a/libc/config/linux/arm/headers.txt
+++ b/libc/config/linux/arm/headers.txt
@@ -9,4 +9,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.string
libc.include.strings
libc.include.search
+
+ # Disabled due to epoll_wait syscalls not being available on this platform.
+ # libc.include.sys_epoll
)
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index a257f3f8d64ab98..7c4e8b188c9bc6c 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -178,6 +178,12 @@ set(TARGET_LIBC_ENTRYPOINTS
# sys/auxv.h entrypoints
libc.src.sys.auxv.getauxval
+ # sys/epoll.h entrypoints
+ # Disabled due to epoll_wait syscalls not being available on this platform.
+ # libc.src.sys.epoll.epoll_wait
+ # libc.src.sys.epoll.epoll_pwait
+ # libc.src.sys.epoll.epoll_pwait2
+
# termios.h entrypoints
libc.src.termios.cfgetispeed
libc.src.termios.cfgetospeed
diff --git a/libc/config/linux/riscv/headers.txt b/libc/config/linux/riscv/headers.txt
index 0ade63dc5933b53..ce00409a6123e77 100644
--- a/libc/config/linux/riscv/headers.txt
+++ b/libc/config/linux/riscv/headers.txt
@@ -29,6 +29,8 @@ set(TARGET_PUBLIC_HEADERS
libc.include.arpa_inet
libc.include.sys_auxv
+ # Disabled due to epoll_wait syscalls not being available on this platform.
+ # libc.include.sys_epoll
libc.include.sys_ioctl
libc.include.sys_mman
libc.include.sys_prctl
diff --git a/libc/config/linux/syscall_numbers.h.inc b/libc/config/linux/syscall_numbers.h.inc
index 5bbb08878ef9df9..9f910c5f9042a81 100644
--- a/libc/config/linux/syscall_numbers.h.inc
+++ b/libc/config/linux/syscall_numbers.h.inc
@@ -258,6 +258,10 @@
#define SYS_epoll_pwait __NR_epoll_pwait
#endif
+#ifdef __NR_epoll_pwait2
+#define SYS_epoll_pwait2 __NR_epoll_pwait2
+#endif
+
#ifdef __NR_epoll_wait
#define SYS_epoll_wait __NR_epoll_wait
#endif
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 3812d9586121e7d..f0e5a0f3bd8f06c 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -136,6 +136,11 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.stdio.scanf
libc.src.stdio.fscanf
+ # sys/epoll.h entrypoints
+ libc.src.sys.epoll.epoll_wait
+ libc.src.sys.epoll.epoll_pwait
+ libc.src.sys.epoll.epoll_pwait2
+
# sys/mman.h entrypoints
libc.src.sys.mman.madvise
libc.src.sys.mman.mmap
diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
index d103176897a74a8..e2bea1fb31f36df 100644
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -29,6 +29,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.arpa_inet
libc.include.sys_auxv
+ libc.include.sys_epoll
libc.include.sys_ioctl
libc.include.sys_mman
libc.include.sys_prctl
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 89fffd1022758ea..24e50fb6a47e019 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -332,6 +332,17 @@ add_gen_header(
.llvm-libc-macros.sys_auxv_macros
)
+add_gen_header(
+ sys_epoll
+ DEF_FILE sys/epoll.h.def
+ GEN_HDR sys/epoll.h
+ DEPENDS
+ .llvm_libc_common_h
+ .llvm-libc-types.struct_epoll_event
+ .llvm-libc-types.struct_epoll_data
+ .llvm-libc-types.sigset_t
+)
+
add_gen_header(
sys_ioctl
DEF_FILE sys/ioctl.h.def
diff --git a/libc/include/llvm-libc-types/CMakeLists.txt b/libc/include/llvm-libc-types/CMakeLists.txt
index 500900ffa0bbb05..6f004d2d6469705 100644
--- a/libc/include/llvm-libc-types/CMakeLists.txt
+++ b/libc/include/llvm-libc-types/CMakeLists.txt
@@ -96,3 +96,5 @@ add_header(rpc_opcodes_t HDR rpc_opcodes_t.h)
add_header(ACTION HDR ACTION.h)
add_header(ENTRY HDR ENTRY.h)
add_header(struct_hsearch_data HDR struct_hsearch_data.h)
+add_header(struct_epoll_event HDR struct_epoll_event.h)
+add_header(struct_epoll_data HDR struct_epoll_data.h)
diff --git a/libc/include/llvm-libc-types/struct_epoll_data.h b/libc/include/llvm-libc-types/struct_epoll_data.h
new file mode 100644
index 000000000000000..c363171089f116f
--- /dev/null
+++ b/libc/include/llvm-libc-types/struct_epoll_data.h
@@ -0,0 +1,21 @@
+//===-- Definition of epoll_data type -------------------------------------===//
+//
+// 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_TYPES_EPOLL_DATA_H__
+#define __LLVM_LIBC_TYPES_EPOLL_DATA_H__
+
+union epoll_data {
+ void *ptr;
+ int fd;
+ __UINT32_TYPE__ u32;
+ __UINT64_TYPE__ u64;
+};
+
+typedef union epoll_data epoll_data_t;
+
+#endif // __LLVM_LIBC_TYPES_EPOLL_DATA_H__
diff --git a/libc/include/llvm-libc-types/struct_epoll_event.h b/libc/include/llvm-libc-types/struct_epoll_event.h
new file mode 100644
index 000000000000000..f902a74838146c2
--- /dev/null
+++ b/libc/include/llvm-libc-types/struct_epoll_event.h
@@ -0,0 +1,19 @@
+//===-- Definition of epoll_event type ------------------------------------===//
+//
+// 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_TYPES_EPOLL_EVENT_H__
+#define __LLVM_LIBC_TYPES_EPOLL_EVENT_H__
+
+#include <llvm-libc-types/struct_epoll_data.h>
+
+struct epoll_event {
+ __UINT32_TYPE__ events;
+ epoll_data_t data;
+};
+
+#endif // __LLVM_LIBC_TYPES_EPOLL_EVENT_H__
diff --git a/libc/include/sys/epoll.h.def b/libc/include/sys/epoll.h.def
new file mode 100644
index 000000000000000..490fad91db3c3a5
--- /dev/null
+++ b/libc/include/sys/epoll.h.def
@@ -0,0 +1,16 @@
+//===-- Linux header epoll.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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SYS_EPOLL_H
+#define LLVM_LIBC_SYS_EPOLL_H
+
+#include <__llvm-libc-common.h>
+
+%%public_api()
+
+#endif // LLVM_LIBC_SYS_EPOLL_H
diff --git a/libc/spec/gnu_ext.td b/libc/spec/gnu_ext.td
index cb0407c84d4e212..1b1b35b4d028be0 100644
--- a/libc/spec/gnu_ext.td
+++ b/libc/spec/gnu_ext.td
@@ -238,7 +238,9 @@ def GnuExtensions : StandardSpec<"GNUExtensions"> {
[], // Macros
[], // Types
[], // Enumerations
- [] // Functions
+ [
+ //TODO: Add getauxval here
+ ] // Functions
>;
HeaderSpec SendFile = HeaderSpec<
diff --git a/libc/spec/linux.td b/libc/spec/linux.td
index eab0a987b920cd9..9fa8734db7eba66 100644
--- a/libc/spec/linux.td
+++ b/libc/spec/linux.td
@@ -1,3 +1,8 @@
+def StructEpollEvent : NamedType<"struct epoll_event">;
+def StructEpollEventPtr : PtrType<StructEpollEvent>;
+
+def StructEpollData : NamedType<"struct epoll_data">;
+
def Linux : StandardSpec<"Linux"> {
HeaderSpec Errno = HeaderSpec<
"errno.h",
@@ -137,6 +142,77 @@ def Linux : StandardSpec<"Linux"> {
[] // Functions
>;
+
+ HeaderSpec SysEpoll = HeaderSpec<
+ "sys/epoll.h",
+ [], // Macros
+ [
+ StructEpollEvent,
+ StructEpollData,
+ SigSetType,
+ StructTimeSpec,
+ ], // Types
+ [], // Enumerations
+ [
+ FunctionSpec<
+ "epoll_create",
+ RetValSpec<IntType>,
+ [
+ ArgSpec<IntType>
+ ]
+ >,
+ FunctionSpec<
+ "epoll_create1",
+ RetValSpec<IntType>,
+ [
+ ArgSpec<IntType>
+ ]
+ >,
+ FunctionSpec<
+ "epoll_ctl",
+ RetValSpec<IntType>,
+ [
+ ArgSpec<IntType>,
+ ArgSpec<IntType>,
+ ArgSpec<IntType>,
+ ArgSpec<StructEpollEventPtr>
+ ]
+ >,
+ FunctionSpec<
+ "epoll_wait",
+ RetValSpec<IntType>,
+ [
+ ArgSpec<IntType>,
+ ArgSpec<StructEpollEventPtr>,
+ ArgSpec<IntType>,
+ ArgSpec<IntType>
+ ]
+ >,
+ FunctionSpec<
+ "epoll_pwait",
+ RetValSpec<IntType>,
+ [
+ ArgSpec<IntType>,
+ ArgSpec<StructEpollEventPtr>,
+ ArgSpec<IntType>,
+ ArgSpec<IntType>,
+ ArgSpec<SigSetPtrType>
+ ]
+ >,
+ FunctionSpec<
+ "epoll_pwait2",
+ RetValSpec<IntType>,
+ [
+ ArgSpec<IntType>,
+ ArgSpec<StructEpollEventPtr>,
+ ArgSpec<IntType>,
+ ArgSpec<ConstStructTimeSpecPtr>,
+ ArgSpec<SigSetPtrType>
+ ]
+ >,
+ ] // Functions
+ >;
+
HeaderSpec Signal = HeaderSpec<
"signal.h",
[
@@ -181,6 +257,7 @@ def Linux : StandardSpec<"Linux"> {
let Headers = [
Errno,
+ SysEpoll,
SysMMan,
SysPrctl,
SysRandom,
diff --git a/libc/src/sys/CMakeLists.txt b/libc/src/sys/CMakeLists.txt
index 81098294176ad5b..57ea7b4beaca1bf 100644
--- a/libc/src/sys/CMakeLists.txt
+++ b/libc/src/sys/CMakeLists.txt
@@ -1,4 +1,5 @@
add_subdirectory(auxv)
+add_subdirectory(epoll)
add_subdirectory(mman)
add_subdirectory(random)
add_subdirectory(resource)
diff --git a/libc/src/sys/epoll/CMakeLists.txt b/libc/src/sys/epoll/CMakeLists.txt
new file mode 100644
index 000000000000000..d4991a238e2a77f
--- /dev/null
+++ b/libc/src/sys/epoll/CMakeLists.txt
@@ -0,0 +1,24 @@
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+ add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+endif()
+
+add_entrypoint_object(
+ epoll_wait
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.epoll_wait
+)
+
+add_entrypoint_object(
+ epoll_pwait
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.epoll_pwait
+)
+
+add_entrypoint_object(
+ epoll_pwait2
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.epoll_pwait2
+)
diff --git a/libc/src/sys/epoll/epoll_pwait.h b/libc/src/sys/epoll/epoll_pwait.h
new file mode 100644
index 000000000000000..b64470a49db040b
--- /dev/null
+++ b/libc/src/sys/epoll/epoll_pwait.h
@@ -0,0 +1,23 @@
+//===-- Implementation header for epoll_pwait 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_EPOLL_EPOLL_PWAIT_H
+#define LLVM_LIBC_SRC_SYS_EPOLL_EPOLL_PWAIT_H
+
+#include "include/llvm-libc-types/sigset_t.h"
+#include "include/llvm-libc-types/struct_epoll_event.h"
+
+namespace LIBC_NAMESPACE {
+
+// TODO: sigmask should be nullable
+int epoll_pwait(int epfd, struct epoll_event *events, int maxevents,
+ int timeout, const sigset_t *sigmask);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_SYS_EPOLL_EPOLL_PWAIT_H
diff --git a/libc/src/sys/epoll/epoll_pwait2.h b/libc/src/sys/epoll/epoll_pwait2.h
new file mode 100644
index 000000000000000..e35bfb86829a6dd
--- /dev/null
+++ b/libc/src/sys/epoll/epoll_pwait2.h
@@ -0,0 +1,24 @@
+//===-- Implementation header for epoll_pwait2 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_EPOLL_EPOLL_PWAIT2_H
+#define LLVM_LIBC_SRC_SYS_EPOLL_EPOLL_PWAIT2_H
+
+#include "include/llvm-libc-types/sigset_t.h"
+#include "include/llvm-libc-types/struct_epoll_event.h"
+#include "include/llvm-libc-types/struct_timespec.h"
+
+namespace LIBC_NAMESPACE {
+
+// TODO: sigmask and timeout should be nullable
+int epoll_pwait2(int epfd, struct epoll_event *events, int maxevents,
+ const struct timespec *timeout, const sigset_t *sigmask);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_SYS_EPOLL_EPOLL_PWAIT2_H
diff --git a/libc/src/sys/epoll/epoll_wait.h b/libc/src/sys/epoll/epoll_wait.h
new file mode 100644
index 000000000000000..e21b0a72a7a420f
--- /dev/null
+++ b/libc/src/sys/epoll/epoll_wait.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for epoll_wait 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_EPOLL_EPOLL_WAIT_H
+#define LLVM_LIBC_SRC_SYS_EPOLL_EPOLL_WAIT_H
+
+#include "include/llvm-libc-types/struct_epoll_event.h"
+
+namespace LIBC_NAMESPACE {
+
+int epoll_wait(int epfd, struct epoll_event *events, int maxevents,
+ int timeout);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_SYS_EPOLL_EPOLL_WAIT_H
diff --git a/libc/src/sys/epoll/linux/CMakeLists.txt b/libc/src/sys/epoll/linux/CMakeLists.txt
new file mode 100644
index 000000000000000..a27905d962dc57e
--- /dev/null
+++ b/libc/src/sys/epoll/linux/CMakeLists.txt
@@ -0,0 +1,41 @@
+add_entrypoint_object(
+ epoll_wait
+ SRCS
+ epoll_wait.cpp
+ HDRS
+ ../epoll_wait.h
+ DEPENDS
+ libc.include.sys_epoll
+ libc.include.sys_syscall
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ epoll_pwait
+ SRCS
+ epoll_pwait.cpp
+ HDRS
+ ../epoll_pwait.h
+ DEPENDS
+ libc.include.sys_epoll
+ libc.include.signal
+ libc.include.sys_syscall
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ epoll_pwait2
+ SRCS
+ epoll_pwait2.cpp
+ HDRS
+ ../epoll_pwait2.h
+ DEPENDS
+ libc.include.sys_epoll
+ libc.include.signal
+ libc.include.time
+ libc.include.sys_syscall
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
diff --git a/libc/src/sys/epoll/linux/epoll_pwait.cpp b/libc/src/sys/epoll/linux/epoll_pwait.cpp
new file mode 100644
index 000000000000000..61389a7b2f5fa9b
--- /dev/null
+++ b/libc/src/sys/epoll/linux/epoll_pwait.cpp
@@ -0,0 +1,39 @@
+//===---------- Linux implementation of the epoll_pwait 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/epoll/epoll_pwait.h"
+
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+
+#include "src/errno/libc_errno.h"
+#include <sys/syscall.h> // For syscall numbers.
+
+#include "include/llvm-libc-types/sigset_t.h"
+#include "include/llvm-libc-types/struct_epoll_event.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, epoll_pwait,
+ (int epfd, struct epoll_event *events, int maxevents,
+ int timeout, const sigset_t *sigmask)) {
+ int ret = LIBC_NAMESPACE::syscall_impl<int>(
+ SYS_epoll_pwait, epfd, reinterpret_cast<long>(events), maxevents, timeout,
+ reinterpret_cast<long>(sigmask), sizeof(sigset_t));
+
+ // A negative return value indicates an error with the magnitude of the
+ // value being the error code.
+ if (ret < 0) {
+ libc_errno = -ret;
+ return -1;
+ }
+
+ return 0;
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/sys/epoll/linux/epoll_pwait2.cpp b/libc/src/sys/epoll/linux/epoll_pwait2.cpp
new file mode 100644
index 000000000000000..ab2d7e6d8309199
--- /dev/null
+++ b/libc/src/sys/epoll/linux/epoll_pwait2.cpp
@@ -0,0 +1,41 @@
+//===---------- Linux implementation of the epoll_pwait2 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/epoll/epoll_pwait2.h"
+
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+
+#include "src/errno/libc_errno.h"
+#include <sys/syscall.h> // For syscall numbers.
+
+#include "include/llvm-libc-types/sigset_t.h"
+#include "include/llvm-libc-types/struct_epoll_event.h"
+#include "include/llvm-libc-types/struct_timespec.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, epoll_pwait2,
+ (int epfd, struct epoll_event *events, int maxevents,
+ const struct timespec *timeout, const sigset_t *sigmask)) {
+ int ret = LIBC_NAMESPACE::syscall_impl<int>(
+ SYS_epoll_pwait2, epfd, reinterpret_cast<long>(events), maxevents,
+ reinterpret_cast<long>(timeout), reinterpret_cast<long>(sigmask),
+ sizeof(sigset_t));
+
+ // A negative return value indicates an error wi...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/79635
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