libc/src/unistd/linux/symlink.cpp

   1 //===-- Linux implementation of symlink -----------------------------------===//
   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/symlink.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 __llvm_libc {
  19
  20 LLVM_LIBC_FUNCTION(int, symlink, (const char *path1, const char *path2)) {
  21 #ifdef SYS_symlink
  22   long ret = __llvm_libc::syscall_impl(SYS_symlink, path1, path2);
  23 #elif defined(SYS_symlinkat)
  24   long ret = __llvm_libc::syscall_impl(SYS_symlinkat, path1, AT_FDCWD, path2);
  25 #else
  26 #error "symlink or symlinkat syscalls not available."
  27 #endif
  28   if (ret < 0) {
  29     libc_errno = -ret;
  30     return -1;
  31   }
  32   return ret;
  33 }
  34
  35 } // namespace __llvm_libc