1 //===-- Linux implementation of link --------------------------------------===// 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/link.h" 10 11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 12 #include "src/__support/common.h" 13 #include "src/errno/libc_errno.h" 14 15 #include <fcntl.h> 16 #include <sys/syscall.h> // For syscall numbers. 17 18 namespace LIBC_NAMESPACE { 19 20 LLVM_LIBC_FUNCTION(int, link, (const char *path1, const char *path2)) { 21 #ifdef SYS_link 22 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_link, path1, path2); 23 #elif defined(SYS_linkat) 24 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_linkat, AT_FDCWD, path1, 25 AT_FDCWD, path2, 0); 26 #else 27 #error "link or linkat syscalls not available." 28 #endif 29 if (ret < 0) { 30 libc_errno = -ret; 31 return -1; 32 } 33 return ret; 34 } 35 36 } // namespace LIBC_NAMESPACE 37