1  /* Linux implementation for renameat2 function.
       2     Copyright (C) 2018-2023 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)