1  /* Create a named fifo.
       2     Copyright (C) 2009-2023 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 */