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 "src/errno/libc_errno.h" 15 #include <fcntl.h> 16 #include <sys/syscall.h> // For syscall numbers. 17 18 namespace LIBC_NAMESPACE { 19 20 LLVM_LIBC_FUNCTION(ssize_t, readlinkat, 21 (int fd, const char *__restrict path, char *__restrict buf, 22 size_t bufsize)) { 23 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_readlinkat, fd, path, 24 buf, bufsize); 25 if (ret < 0) { 26 libc_errno = static_cast<int>(-ret); 27 return -1; 28 } 29 return ret; 30 } 31 32 } // namespace LIBC_NAMESPACE 33