1 //===-- Linux implementation of readlinkat --------------------------------===// 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/readlinkat.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(ssize_t, readlinkat, 22 (int fd, const char *__restrict path, char *__restrict buf, 23 size_t bufsize)) { 24 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_readlinkat, fd, path, 25 buf, bufsize); 26 if (ret < 0) { 27 libc_errno = static_cast<int>(-ret); 28 return -1; 29 } 30 return ret; 31 } 32 33 } // namespace LIBC_NAMESPACE_DECL 34