sysdeps/unix/sysv/linux/mq_open.c

   1 /* Copyright (C) 2004, 2005 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <mqueue.h>
  21 #include <stdarg.h>
  22 #include <stddef.h>
  23 #include <sysdep.h>
  24
  25 #ifdef __NR_mq_open
  26
  27 /* Establish connection between a process and a message queue NAME and
  28    return message queue descriptor or (mqd_t) -1 on error.  OFLAG determines
  29    the type of access used.  If O_CREAT is on OFLAG, the third argument is
  30    taken as a `mode_t', the mode of the created message queue, and the fourth
  31    argument is taken as `struct mq_attr *', pointer to message queue
  32    attributes.  If the fourth argument is NULL, default attributes are
  33    used.  */
  34 mqd_t
  35 mq_open (const char *name, int oflag, ...)
  36 {
  37   if (name[0] != '/')
  38     {
  39       __set_errno (EINVAL);
  40       return -1;
  41     }
  42
  43   mode_t mode = 0;
  44   struct mq_attr *attr = NULL;
  45   if (oflag & O_CREAT)
  46     {
  47       va_list ap;
  48
  49       va_start (ap, oflag);
  50       mode = va_arg (ap, mode_t);
  51       attr = va_arg (ap, struct mq_attr *);
  52       va_end (ap);
  53     }
  54
  55   return INLINE_SYSCALL (mq_open, 4, name + 1, oflag, mode, attr);
  56 }
  57
  58 #else
  59 # include <rt/mq_open.c>
  60 #endif