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/__support/macros/config.h" 14 #include "src/errno/libc_errno.h" 15 16 #include "hdr/fcntl_macros.h" 17 #include <sys/syscall.h> // For syscall numbers. 18 19 namespace LIBC_NAMESPACE_DECL { 20 21 LLVM_LIBC_FUNCTION(int, link, (const char *path1, const char *path2)) { 22 #ifdef SYS_link 23 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_link, path1, path2); 24 #elif defined(SYS_linkat) 25 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_linkat, AT_FDCWD, path1, 26 AT_FDCWD, path2, 0); 27 #else 28 #error "link or linkat syscalls not available." 29 #endif 30 if (ret < 0) { 31 libc_errno = -ret; 32 return -1; 33 } 34 return ret; 35 } 36 37 } // namespace LIBC_NAMESPACE_DECL 38