sysdeps/unix/sysv/linux/mq_open.c

   1 /* Copyright (C) 2004, 2005, 2007 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 <stdio.h>
  24 #include <sysdep.h>
  25
  26 #ifdef __NR_mq_open
  27
  28 /* Establish connection between a process and a message queue NAME and
  29    return message queue descriptor or (mqd_t) -1 on error.  OFLAG determines
  30    the type of access used.  If O_CREAT is on OFLAG, the third argument is
  31    taken as a `mode_t', the mode of the created message queue, and the fourth
  32    argument is taken as `struct mq_attr *', pointer to message queue
  33    attributes.  If the fourth argument is NULL, default attributes are
  34    used.  */
  35 mqd_t
  36 __mq_open (const char *name, int oflag, ...)
  37 {
  38   if (name[0] != '/')
  39     {
  40       __set_errno (EINVAL);
  41       return -1;
  42     }
  43
  44   mode_t mode = 0;
  45   struct mq_attr *attr = NULL;
  46   if (oflag & O_CREAT)
  47     {
  48       va_list ap;
  49
  50       va_start (ap, oflag);
  51       mode = va_arg (ap, mode_t);
  52       attr = va_arg (ap, struct mq_attr *);
  53       va_end (ap);
  54     }
  55
  56   return INLINE_SYSCALL (mq_open, 4, name + 1, oflag, mode, attr);
  57 }
  58 strong_alias (__mq_open, mq_open);
  59
  60 mqd_t
  61 __mq_open_2 (const char *name, int oflag)
  62 {
  63   if (oflag & O_CREAT)
  64     __fortify_fail ("invalid mq_open call: O_CREAT without mode and attr");
  65
  66   return __mq_open (name, oflag);
  67 }
  68 #else
  69 # include <rt/mq_open.c>
  70 #endif