libc/src/sys/stat/linux/chmod.cpp

   1 //===-- Linux implementation of chmod -------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/sys/stat/chmod.h"
  10
  11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
  12 #include "src/__support/common.h"
  13
  14 #include "hdr/fcntl_macros.h"
  15 #include "hdr/types/mode_t.h"
  16 #include "src/__support/macros/config.h"
  17 #include "src/errno/libc_errno.h"
  18 #include <sys/stat.h>
  19 #include <sys/syscall.h> // For syscall numbers.
  20
  21 namespace LIBC_NAMESPACE_DECL {
  22
  23 LLVM_LIBC_FUNCTION(int, chmod, (const char *path, mode_t mode)) {
  24 #ifdef SYS_chmod
  25   int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_chmod, path, mode);
  26 #elif defined(SYS_fchmodat2)
  27   int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_fchmodat2, AT_FDCWD, path,
  28                                               mode, 0, AT_SYMLINK_NOFOLLOW);
  29 #elif defined(SYS_fchmodat)
  30   int ret =
  31       LIBC_NAMESPACE::syscall_impl<int>(SYS_fchmodat, AT_FDCWD, path, mode, 0);
  32 #else
  33 #error "chmod, fchmodat and fchmodat2 syscalls not available."
  34 #endif
  35
  36   if (ret < 0) {
  37     libc_errno = -ret;
  38     return -1;
  39   }
  40   return 0;
  41 }
  42
  43 } // namespace LIBC_NAMESPACE_DECL