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

   1 /* Copyright (C) 1995-2013 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 #include <bp-checks.h>
  27
  28 #include <shlib-compat.h>
  29
  30 struct __old_msqid_ds
  31 {
  32   struct __old_ipc_perm msg_perm;       /* structure describing operation permission */
  33   struct msg *__unbounded __msg_first;  /* pointer to first message on queue */
  34   struct msg *__unbounded __msg_last;   /* pointer to last message on queue */
  35   __time_t msg_stime;                   /* time of last msgsnd command */
  36   __time_t msg_rtime;                   /* time of last msgrcv command */
  37   __time_t msg_ctime;                   /* time of last change */
  38   struct wait_queue *__unbounded __wwait; /* ??? */
  39   struct wait_queue *__unbounded __rwait; /* ??? */
  40   unsigned short int __msg_cbytes;      /* current number of bytes on queue */
  41   unsigned short int msg_qnum;          /* number of messages currently on queue */
  42   unsigned short int msg_qbytes;        /* max number of bytes allowed on queue */
  43   __ipc_pid_t msg_lspid;                /* pid of last msgsnd() */
  44   __ipc_pid_t msg_lrpid;                /* pid of last msgrcv() */
  45 };
  46
  47 /* Allows to control internal state and destruction of message queue
  48    objects.  */
  49 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  50 int __old_msgctl (int, int, struct __old_msqid_ds *);
  51 #endif
  52 int __new_msgctl (int, int, struct msqid_ds *);
  53
  54 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  55 int
  56 attribute_compat_text_section
  57 __old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf)
  58 {
  59   return INLINE_SYSCALL (ipc, 5, IPCOP_msgctl,
  60                          msqid, cmd, 0, CHECK_1 (buf));
  61 }
  62 compat_symbol (libc, __old_msgctl, msgctl, GLIBC_2_0);
  63 #endif
  64
  65 int
  66 __new_msgctl (int msqid, int cmd, struct msqid_ds *buf)
  67 {
  68   return INLINE_SYSCALL (ipc, 5, IPCOP_msgctl,
  69                          msqid, cmd | __IPC_64, 0, CHECK_1 (buf));
  70 }
  71
  72 versioned_symbol (libc, __new_msgctl, msgctl, GLIBC_2_2);