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
18namespace LIBC_NAMESPACE {
19
20LLVM_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, ts: fd, ts: path,
24 ts: buf, ts: 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

source code of libc/src/unistd/linux/readlinkat.cpp