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glibc  2.9
mq_open.c
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00001 /* Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <mqueue.h>
00021 #include <stdarg.h>
00022 #include <stddef.h>
00023 #include <stdio.h>
00024 #include <sysdep.h>
00025 
00026 #ifdef __NR_mq_open
00027 
00028 /* Establish connection between a process and a message queue NAME and
00029    return message queue descriptor or (mqd_t) -1 on error.  OFLAG determines
00030    the type of access used.  If O_CREAT is on OFLAG, the third argument is
00031    taken as a `mode_t', the mode of the created message queue, and the fourth
00032    argument is taken as `struct mq_attr *', pointer to message queue
00033    attributes.  If the fourth argument is NULL, default attributes are
00034    used.  */
00035 mqd_t
00036 __mq_open (const char *name, int oflag, ...)
00037 {
00038   if (name[0] != '/')
00039     {
00040       __set_errno (EINVAL);
00041       return -1;
00042     }
00043 
00044   mode_t mode = 0;
00045   struct mq_attr *attr = NULL;
00046   if (oflag & O_CREAT)
00047     {
00048       va_list ap;
00049 
00050       va_start (ap, oflag);
00051       mode = va_arg (ap, mode_t);
00052       attr = va_arg (ap, struct mq_attr *);
00053       va_end (ap);
00054     }
00055 
00056   return INLINE_SYSCALL (mq_open, 4, name + 1, oflag, mode, attr);
00057 }
00058 strong_alias (__mq_open, mq_open);
00059 
00060 mqd_t
00061 __mq_open_2 (const char *name, int oflag)
00062 {
00063   if (oflag & O_CREAT)
00064     __fortify_fail ("invalid mq_open call: O_CREAT without mode and attr");
00065 
00066   return __mq_open (name, oflag);
00067 }
00068 #else
00069 # include <rt/mq_open.c>
00070 #endif