libc/src/stdio/linux/remove.cpp

   1 //===-- Linux implementation of remove ------------------------------------===//
   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/stdio/remove.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>       // For AT_* macros.
  16 #include <sys/syscall.h> // For syscall numbers.
  17
  18 namespace LIBC_NAMESPACE {
  19
  20 LLVM_LIBC_FUNCTION(int, remove, (const char *path)) {
  21   // We first try unlinking it as a file. If it is ia file, it will succeed. If
  22   // it fails with EISDIR, we will try unlinking it as a directory.
  23   int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_unlinkat, AT_FDCWD, path, 0);
  24   if (ret == -EISDIR)
  25     ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_unlinkat, AT_FDCWD, path,
  26                                             AT_REMOVEDIR);
  27   if (ret >= 0)
  28     return 0;
  29   libc_errno = -ret;
  30   return -1;
  31 }
  32
  33 } // namespace LIBC_NAMESPACE