sysdeps/unix/sysv/linux/i386/msgctl.c

   1 /* Copyright (C) 1995-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sys/msg.h>
  21 #include <ipc_priv.h>
  22
  23 #include <sysdep.h>
  24 #include <string.h>
  25 #include <sys/syscall.h>
  26
  27 #include <shlib-compat.h>
  28
  29 struct __old_msqid_ds
  30 {
  31   struct __old_ipc_perm msg_perm;       /* structure describing operation permission */
  32   struct msg *__msg_first;              /* pointer to first message on queue */
  33   struct msg *__msg_last;               /* pointer to last message on queue */
  34   __time_t msg_stime;                   /* time of last msgsnd command */
  35   __time_t msg_rtime;                   /* time of last msgrcv command */
  36   __time_t msg_ctime;                   /* time of last change */
  37   struct wait_queue *__wwait;           /* ??? */
  38   struct wait_queue *__rwait;           /* ??? */
  39   unsigned short int __msg_cbytes;      /* current number of bytes on queue */
  40   unsigned short int msg_qnum;          /* number of messages currently on queue */
  41   unsigned short int msg_qbytes;        /* max number of bytes allowed on queue */
  42   __ipc_pid_t msg_lspid;                /* pid of last msgsnd() */
  43   __ipc_pid_t msg_lrpid;                /* pid of last msgrcv() */
  44 };
  45
  46 /* Allows to control internal state and destruction of message queue
  47    objects.  */
  48 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  49 int __old_msgctl (int, int, struct __old_msqid_ds *);
  50 #endif
  51 int __new_msgctl (int, int, struct msqid_ds *);
  52
  53 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  54 int
  55 attribute_compat_text_section
  56 __old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf)
  57 {
  58   return INLINE_SYSCALL (ipc, 5, IPCOP_msgctl, msqid, cmd, 0, buf);
  59 }
  60 compat_symbol (libc, __old_msgctl, msgctl, GLIBC_2_0);
  61 #endif
  62
  63 int
  64 __new_msgctl (int msqid, int cmd, struct msqid_ds *buf)
  65 {
  66   return INLINE_SYSCALL (ipc, 5, IPCOP_msgctl,
  67                          msqid, cmd | __IPC_64, 0, buf);
  68 }
  69
  70 versioned_symbol (libc, __new_msgctl, msgctl, GLIBC_2_2);