sysdeps/unix/sysv/linux/renameat2.c

   1 /* Linux implementation for renameat2 function.
   2    Copyright (C) 2018-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <sysdep.h>
  22
  23 int
  24 __renameat2 (int oldfd, const char *old, int newfd, const char *new,
  25            unsigned int flags)
  26 {
  27 #if !defined (__NR_renameat) || defined (__ASSUME_RENAMEAT2)
  28   return INLINE_SYSCALL_CALL (renameat2, oldfd, old, newfd, new, flags);
  29 #else
  30   if (flags == 0)
  31     return __renameat (oldfd, old, newfd, new);
  32
  33   /* For non-zero flags, try the renameat2 system call.  */
  34   int ret = INLINE_SYSCALL_CALL (renameat2, oldfd, old, newfd, new, flags);
  35   if (ret != -1 || errno != ENOSYS)
  36     /* Preserve non-error/non-ENOSYS return values.  */
  37     return ret;
  38
  39   /* No kernel support for renameat2.  All flags are unknown.  */
  40   __set_errno (EINVAL);
  41   return -1;
  42 #endif
  43 }
  44 libc_hidden_def (__renameat2)
  45 weak_alias (__renameat2, renameat2)