sysdeps/unix/sysv/linux/mq_open.c

   1 /* Copyright (C) 2004-2024 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <mqueue.h>
  20 #include <stdarg.h>
  21 #include <stddef.h>
  22 #include <stdio.h>
  23 #include <sysdep.h>
  24 #include <shlib-compat.h>
  25
  26 /* Establish connection between a process and a message queue NAME and
  27    return message queue descriptor or (mqd_t) -1 on error.  OFLAG determines
  28    the type of access used.  If O_CREAT is on OFLAG, the third argument is
  29    taken as a `mode_t', the mode of the created message queue, and the fourth
  30    argument is taken as `struct mq_attr *', pointer to message queue
  31    attributes.  If the fourth argument is NULL, default attributes are
  32    used.  */
  33 mqd_t
  34 __mq_open (const char *name, int oflag, ...)
  35 {
  36   if (name[0] != '/')
  37     return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
  38
  39   mode_t mode = 0;
  40   struct mq_attr *attr = NULL;
  41   if (oflag & O_CREAT)
  42     {
  43       va_list ap;
  44
  45       va_start (ap, oflag);
  46       mode = va_arg (ap, mode_t);
  47       attr = va_arg (ap, struct mq_attr *);
  48       va_end (ap);
  49     }
  50
  51   return INLINE_SYSCALL (mq_open, 4, name + 1, oflag, mode, attr);
  52 }
  53 versioned_symbol (libc, __mq_open, mq_open, GLIBC_2_34);
  54 #if OTHER_SHLIB_COMPAT (librt, GLIBC_2_3_4, GLIBC_2_34)
  55 compat_symbol (libc, __mq_open, mq_open, GLIBC_2_3_4);
  56 #endif
  57
  58 mqd_t
  59 ___mq_open_2 (const char *name, int oflag)
  60 {
  61   if (oflag & O_CREAT)
  62     __fortify_fail ("invalid mq_open call: O_CREAT without mode and attr");
  63
  64   return __mq_open (name, oflag);
  65 }
  66 versioned_symbol (libc, ___mq_open_2, __mq_open_2, GLIBC_2_34);
  67 #if OTHER_SHLIB_COMPAT (librt, GLIBC_2_7, GLIBC_2_34)
  68 compat_symbol (libc, ___mq_open_2, __mq_open_2, GLIBC_2_7);
  69 #endif