lib/mkfifo.c

   1 /* Create a named fifo.
   2    Copyright (C) 2009-2024 Free Software Foundation, Inc.
   3
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation, either version 3 of the
   7    License, or (at your option) any later version.
   8
   9    This file 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
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* written by Eric Blake */
  18
  19 #include <config.h>
  20
  21 #include <sys/stat.h>
  22
  23 #include <errno.h>
  24 #include <string.h>
  25
  26 #if !HAVE_MKFIFO
  27 /* Mingw lacks mkfifo; always fail with ENOSYS.  */
  28
  29 int
  30 mkfifo (_GL_UNUSED char const *name, _GL_UNUSED mode_t mode)
  31 {
  32   errno = ENOSYS;
  33   return -1;
  34 }
  35
  36 #else /* HAVE_MKFIFO */
  37
  38 # undef mkfifo
  39
  40 /* Create a named fifo FILE, with access permissions in MODE.  Work
  41 around trailing slash bugs.  */
  42
  43 int
  44 rpl_mkfifo (char const *name, mode_t mode)
  45 {
  46 # if MKFIFO_TRAILING_SLASH_BUG
  47   size_t len = strlen (name);
  48   if (len && name[len - 1] == '/')
  49     {
  50       struct stat st;
  51       if (stat (name, &st) == 0 || errno == EOVERFLOW)
  52         errno = EEXIST;
  53       return -1;
  54     }
  55 # endif
  56   return mkfifo (name, mode);
  57 }
  58 #endif /* HAVE_MKFIFO */