io/mkfifoat.c

   1 /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <stddef.h>
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23
  24
  25 /* Create a named pipe (FIFO) named PATH relative to FD with
  26    protections MODE.  */
  27 int
  28 mkfifoat (int fd, const char *path, mode_t mode)
  29 {
  30   if (path == NULL)
  31     {
  32       __set_errno (EINVAL);
  33       return -1;
  34     }
  35
  36   if (fd != AT_FDCWD && path[0] != '/')
  37     {
  38       /* Check FD is associated with a directory.  */
  39       struct stat64 st;
  40       if (__fstat64 (fd, &st) != 0)
  41         return -1;
  42
  43       if (!S_ISDIR (st.st_mode))
  44         {
  45           __set_errno (ENOTDIR);
  46           return -1;
  47         }
  48     }
  49
  50   __set_errno (ENOSYS);
  51   return -1;
  52 }
  53
  54
  55 stub_warning (mkfifoat)