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 "src/errno/libc_errno.h" 15 #include <fcntl.h> 16 #include <sys/stat.h> 17 #include <sys/syscall.h> // For syscall numbers. 18 19 namespace LIBC_NAMESPACE { 20 21 LLVM_LIBC_FUNCTION(int, chmod, (const char *path, mode_t mode)) { 22 #ifdef SYS_chmod 23 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_chmod, path, mode); 24 #elif defined(SYS_fchmodat2) 25 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_fchmodat2, AT_FDCWD, path, 26 mode, 0, AT_SYMLINK_NOFOLLOW); 27 #elif defined(SYS_fchmodat) 28 int ret = 29 LIBC_NAMESPACE::syscall_impl<int>(SYS_fchmodat, AT_FDCWD, path, mode, 0); 30 #else 31 #error "chmod, fchmodat and fchmodat2 syscalls not available." 32 #endif 33 34 if (ret < 0) { 35 libc_errno = -ret; 36 return -1; 37 } 38 return 0; 39 } 40 41 } // namespace LIBC_NAMESPACE 42