1 //===-- Linux implementation of access ------------------------------------===// 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/unistd/access.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 "src/__support/macros/config.h" 16 #include "src/errno/libc_errno.h" 17 #include <sys/syscall.h> // For syscall numbers. 18 19 namespace LIBC_NAMESPACE_DECL { 20 21 LLVM_LIBC_FUNCTION(int, access, (const char *path, int mode)) { 22 #ifdef SYS_access 23 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_access, path, mode); 24 #elif defined(SYS_faccessat) 25 int ret = 26 LIBC_NAMESPACE::syscall_impl<int>(SYS_faccessat, AT_FDCWD, path, mode, 0); 27 #else 28 #error "access and faccessat syscalls not available." 29 #endif 30 31 if (ret < 0) { 32 libc_errno = -ret; 33 return -1; 34 } 35 return 0; 36 } 37 38 } // namespace LIBC_NAMESPACE_DECL 39