libc/src/unistd/linux/link.cpp

   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