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122 lines
4.1 KiB
C
122 lines
4.1 KiB
C
/* Copyright (C) 1995, 1997, 1998, 2000, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <sys/msg.h>
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#include <ipc_priv.h>
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#include <sysdep.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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#include "kernel-features.h"
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struct __old_msqid_ds
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{
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struct __old_ipc_perm msg_perm; /* structure describing operation permission */
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struct msg *__unbounded __msg_first; /* pointer to first message on queue */
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struct msg *__unbounded __msg_last; /* pointer to last message on queue */
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__time_t msg_stime; /* time of last msgsnd command */
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__time_t msg_rtime; /* time of last msgrcv command */
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__time_t msg_ctime; /* time of last change */
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struct wait_queue *__unbounded __wwait; /* ??? */
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struct wait_queue *__unbounded __rwait; /* ??? */
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unsigned short int __msg_cbytes; /* current number of bytes on queue */
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unsigned short int msg_qnum; /* number of messages currently on queue */
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unsigned short int msg_qbytes; /* max number of bytes allowed on queue */
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__ipc_pid_t msg_lspid; /* pid of last msgsnd() */
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__ipc_pid_t msg_lrpid; /* pid of last msgrcv() */
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};
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/* Allows to control internal state and destruction of message queue
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objects. */
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int __new_msgctl (int, int, struct msqid_ds *);
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int
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__new_msgctl (int msqid, int cmd, struct msqid_ds *buf)
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{
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/* This is a misnomer -- Alpha had 32-bit uids at the beginning
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of time. However, msg_qnum and msg_qbytes changed size at
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the same time the size of uid changed elsewhere. */
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#if __ASSUME_32BITUIDS > 0
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return INLINE_SYSCALL (msgctl, 3, msqid, cmd | __IPC_64, CHECK_1 (buf));
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#else
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switch (cmd) {
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case MSG_STAT:
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case IPC_STAT:
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case IPC_SET:
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break;
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default:
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return INLINE_SYSCALL (msgctl, 3, msqid, cmd, CHECK_1 (buf));
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}
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{
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int save_errno = errno, result;
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struct __old_msqid_ds old;
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/* Unfortunately there is no way how to find out for sure whether
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we should use old or new msgctl. */
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result = INLINE_SYSCALL (msgctl, 3, msqid, cmd | __IPC_64, CHECK_1 (buf));
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if (result != -1 || errno != EINVAL)
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return result;
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__set_errno(save_errno);
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if (cmd == IPC_SET)
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{
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old.msg_perm.uid = buf->msg_perm.uid;
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old.msg_perm.gid = buf->msg_perm.gid;
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old.msg_perm.mode = buf->msg_perm.mode;
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old.msg_qbytes = buf->msg_qbytes;
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if (old.msg_perm.uid != buf->msg_perm.uid ||
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old.msg_perm.gid != buf->msg_perm.gid ||
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old.msg_qbytes != buf->msg_qbytes)
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{
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__set_errno (EINVAL);
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return -1;
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}
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}
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result = INLINE_SYSCALL (msgctl, 3, msqid, cmd, __ptrvalue (&old));
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if (result != -1 && cmd != IPC_SET)
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{
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memset(buf, 0, sizeof(*buf));
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buf->msg_perm.__key = old.msg_perm.__key;
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buf->msg_perm.uid = old.msg_perm.uid;
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buf->msg_perm.gid = old.msg_perm.gid;
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buf->msg_perm.cuid = old.msg_perm.cuid;
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buf->msg_perm.cgid = old.msg_perm.cgid;
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buf->msg_perm.mode = old.msg_perm.mode;
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buf->msg_perm.__seq = old.msg_perm.__seq;
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buf->msg_stime = old.msg_stime;
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buf->msg_rtime = old.msg_rtime;
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buf->msg_ctime = old.msg_ctime;
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buf->__msg_cbytes = old.__msg_cbytes;
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buf->msg_qnum = old.msg_qnum;
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buf->msg_qbytes = old.msg_qbytes;
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buf->msg_lspid = old.msg_lspid;
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buf->msg_lrpid = old.msg_lrpid;
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}
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return result;
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}
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#endif
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}
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#include <shlib-compat.h>
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versioned_symbol (libc, __new_msgctl, msgctl, GLIBC_2_2);
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