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 44