[libc-commits] [libc] [libc] implement pathconf/fpathconf (PR #87165)

via libc-commits libc-commits at lists.llvm.org
Sat Mar 30 11:15:05 PDT 2024


llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: Nhat Nguyen  (changkhothuychung)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/87165.diff


7 Files Affected:

- (modified) libc/config/linux/aarch64/entrypoints.txt (+2) 
- (modified) libc/config/linux/riscv/entrypoints.txt (+2) 
- (modified) libc/config/linux/x86_64/entrypoints.txt (+2) 
- (modified) libc/src/unistd/CMakeLists.txt (+14) 
- (modified) libc/src/unistd/linux/CMakeLists.txt (+26) 
- (added) libc/src/unistd/linux/pathconf.cpp (+68) 
- (added) libc/src/unistd/pathconf.h (+20) 


``````````diff
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 78da7f0b334b1f..be0c4bebfd95ad 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -282,6 +282,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.dup3
     libc.src.unistd.execve
     libc.src.unistd.fchdir
+    libc.src.unistd.fpathconf
     libc.src.unistd.fsync
     libc.src.unistd.ftruncate
     libc.src.unistd.getcwd
@@ -293,6 +294,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.link
     libc.src.unistd.linkat
     libc.src.unistd.lseek
+    libc.src.unistd.pathconf
     libc.src.unistd.pread
     libc.src.unistd.pwrite
     libc.src.unistd.read
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 5aae4e246cfb3c..2d8f9b1f6dd82c 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -287,6 +287,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.dup3
     libc.src.unistd.execve
     libc.src.unistd.fchdir
+    libc.src.unistd.fpathconf
     libc.src.unistd.fsync
     libc.src.unistd.ftruncate
     libc.src.unistd.getcwd
@@ -298,6 +299,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.link
     libc.src.unistd.linkat
     libc.src.unistd.lseek
+    libc.src.unistd.pathconf
     libc.src.unistd.pread
     libc.src.unistd.pwrite
     libc.src.unistd.read
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 5b428e51aee620..0f00f264ea1490 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -297,6 +297,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.dup3
     libc.src.unistd.execve
     libc.src.unistd.fchdir
+    libc.src.unistd.fpathconf
     libc.src.unistd.fsync
     libc.src.unistd.ftruncate
     libc.src.unistd.getcwd
@@ -308,6 +309,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.link
     libc.src.unistd.linkat
     libc.src.unistd.lseek
+    libc.src.unistd.pathconf
     libc.src.unistd.pread
     libc.src.unistd.pwrite
     libc.src.unistd.read
diff --git a/libc/src/unistd/CMakeLists.txt b/libc/src/unistd/CMakeLists.txt
index e22b0e1872caa1..20c87f668b381b 100644
--- a/libc/src/unistd/CMakeLists.txt
+++ b/libc/src/unistd/CMakeLists.txt
@@ -58,6 +58,13 @@ add_entrypoint_object(
     .${LIBC_TARGET_OS}.fork
 )
 
+add_entrypoint_object(
+  fpathconf
+  ALIAS
+  DEPENDS
+    .${LIBC_TARGET_OS}.fpathconf
+)
+
 add_entrypoint_object(
   execv
   ALIAS
@@ -149,6 +156,13 @@ add_entrypoint_object(
     .${LIBC_TARGET_OS}.lseek
 )
 
+add_entrypoint_object(
+  pathconf
+  ALIAS
+  DEPENDS
+    .${LIBC_TARGET_OS}.pathconf
+)
+
 add_entrypoint_object(
   pread
   ALIAS
diff --git a/libc/src/unistd/linux/CMakeLists.txt b/libc/src/unistd/linux/CMakeLists.txt
index df85d44e9e9edc..0ee59d5391ac5e 100644
--- a/libc/src/unistd/linux/CMakeLists.txt
+++ b/libc/src/unistd/linux/CMakeLists.txt
@@ -105,6 +105,19 @@ add_entrypoint_object(
     libc.src.errno.errno
 )
 
+add_entrypoint_object(
+  fpathconf
+  SRCS
+    fpathconf.cpp
+  HDRS
+    ../fpathconf.h
+  DEPENDS
+    libc.include.unistd
+    libc.include.sys_syscall
+    libc.src.__support.OSUtil.osutil
+    libc.src.errno.errno
+)
+
 add_entrypoint_object(
   execv
   SRCS
@@ -273,6 +286,19 @@ add_entrypoint_object(
     libc.src.errno.errno
 )
 
+add_entrypoint_object(
+  pathconf
+  SRCS
+  pathconf.cpp
+  HDRS
+    ../pathconf.h
+  DEPENDS
+    libc.include.unistd
+    libc.include.sys_syscall
+    libc.src.__support.OSUtil.osutil
+    libc.src.errno.errno
+)
+
 add_entrypoint_object(
   pread
   SRCS
diff --git a/libc/src/unistd/linux/pathconf.cpp b/libc/src/unistd/linux/pathconf.cpp
new file mode 100644
index 00000000000000..fed94e7d423716
--- /dev/null
+++ b/libc/src/unistd/linux/pathconf.cpp
@@ -0,0 +1,68 @@
+//===-- Linux implementation of pathconf ----------------------------------===//
+//
+// 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/pread.h"
+
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+#include "src/__support/macros/sanitizer.h" // for MSAN_UNPOISON
+#include "src/errno/libc_errno.h"
+#include <stdint.h> // For uint64_t.
+#include <sys/statvfs.h>
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace LIBC_NAMESPACE {
+
+static long pathconfig(const struct statvfs &s, int name) {
+  switch (name) {
+  case _PC_LINK_MAX:
+    return _POSIX_LINK_MAX;
+
+  case _PC_MAX_CANON:
+    return _POSIX_MAX_CANON;
+
+  case _PC_MAX_INPUT:
+    return _POSIX_MAX_INPUT;
+
+  case _PC_NAME_MAX:
+    return _POSIX_NAME_MAX;
+
+  case _PC_PATH_MAX:
+    return _POSIX_PATH_MAX;
+
+  case _PC_PIPE_BUF:
+    return _POSIX_PIPE_BUF;
+
+  case _PC_CHOWN_RESTRICTED:
+    return _POSIX_CHOWN_RESTRICTED;
+
+  case _PC_NO_TRUNC:
+    return _POSIX_NO_TRUNC;
+
+  case _PC_VDISABLE:
+    return _POSIX_VDISABLE;
+  }
+}
+
+LLVM_LIBC_FUNCTION(long, pathconf, (char *path, int name)) {
+  struct statvfs sb;
+  if (statvfs(path, &sb) == -1) {
+    return -1;
+  }
+  return pathconfig(sb, name);
+}
+
+LLVM_LIBC_FUNCTION(long, fpathconf, (int fd, int name)) {
+  struct statvfs sb;
+  if (statvfs(path, &sb) == -1) {
+    return -1;
+  }
+  return pathconfig(sb, name);
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/unistd/pathconf.h b/libc/src/unistd/pathconf.h
new file mode 100644
index 00000000000000..a397cd9323bbb8
--- /dev/null
+++ b/libc/src/unistd/pathconf.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for pathconf ----------------------*- 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_UNISTD_PREAD_H
+#define LLVM_LIBC_SRC_UNISTD_PREAD_H
+
+#include <unistd.h>
+
+namespace LIBC_NAMESPACE {
+
+long pathconf(char *path, int name);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_UNISTD_PREAD_H

``````````

</details>


https://github.com/llvm/llvm-project/pull/87165


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