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Linux/Alpha specific msgctl implementation.

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This commit is contained in:
Ulrich Drepper 2000-02-11 21:00:09 +00:00
parent 6753cccf4b
commit 9e683793e4
1 changed files with 120 additions and 0 deletions
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120
sysdeps/unix/sysv/linux/alpha/msgctl.c Normal file
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/* Copyright (C) 1995, 1997, 1998, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <sys/msg.h>
#include <ipc_priv.h>
#include <sysdep.h>
#include <string.h>
#include <sys/syscall.h>
#include "kernel-features.h"
struct __old_msqid_ds
{
struct __old_ipc_perm msg_perm; /* structure describing operation permission */
struct msg *__msg_first; /* pointer to first message on queue */
struct msg *__msg_last; /* pointer to last message on queue */
__time_t msg_stime; /* time of last msgsnd command */
__time_t msg_rtime; /* time of last msgrcv command */
__time_t msg_ctime; /* time of last change */
struct wait_queue *__wwait; /* ??? */
struct wait_queue *__rwait; /* ??? */
unsigned short int __msg_cbytes; /* current number of bytes on queue */
unsigned short int msg_qnum; /* number of messages currently on queue */
unsigned short int msg_qbytes; /* max number of bytes allowed on queue */
__ipc_pid_t msg_lspid; /* pid of last msgsnd() */
__ipc_pid_t msg_lrpid; /* pid of last msgrcv() */
};
/* Allows to control internal state and destruction of message queue
objects. */
int __new_msgctl (int, int, struct msqid_ds *);
int
__new_msgctl (int msqid, int cmd, struct msqid_ds *buf)
{
#if __ASSUME_32BITUIDS > 0
return INLINE_SYSCALL (msgctl, 3, msqid, cmd | __IPC_64, buf);
#else
switch (cmd) {
case MSG_STAT:
case IPC_STAT:
case IPC_SET:
break;
default:
return INLINE_SYSCALL (msgctl, 3, msqid, cmd, buf);
}
{
int save_errno = errno, result;
struct __old_msqid_ds old;
/* Unfortunately there is no way how to find out for sure whether
we should use old or new msgctl. */
result = INLINE_SYSCALL (msgctl, 3, msqid, cmd | __IPC_64, buf);
if (result != -1 || errno != EINVAL)
return result;
__set_errno(save_errno);
if (cmd == IPC_SET)
{
old.msg_perm.uid = buf->msg_perm.uid;
old.msg_perm.gid = buf->msg_perm.gid;
old.msg_perm.mode = buf->msg_perm.mode;
old.msg_qbytes = buf->msg_qbytes;
if (old.msg_perm.uid != buf->msg_perm.uid ||
old.msg_perm.gid != buf->msg_perm.gid ||
old.msg_qbytes != buf->msg_qbytes)
{
__set_errno (EINVAL);
return -1;
}
}
result = INLINE_SYSCALL (msgctl, 3, msqid, cmd, &old);
if (result != -1 && cmd != IPC_SET)
{
memset(buf, 0, sizeof(*buf));
buf->msg_perm.__key = old.msg_perm.__key;
buf->msg_perm.uid = old.msg_perm.uid;
buf->msg_perm.gid = old.msg_perm.gid;
buf->msg_perm.cuid = old.msg_perm.cuid;
buf->msg_perm.cgid = old.msg_perm.cgid;
buf->msg_perm.mode = old.msg_perm.mode;
buf->msg_perm.__seq = old.msg_perm.__seq;
buf->msg_stime = old.msg_stime;
buf->msg_rtime = old.msg_rtime;
buf->msg_ctime = old.msg_ctime;
buf->__msg_cbytes = old.__msg_cbytes;
buf->msg_qnum = old.msg_qnum;
buf->msg_qbytes = old.msg_qbytes;
buf->msg_lspid = old.msg_lspid;
buf->msg_lrpid = old.msg_lrpid;
}
return result;
}
#endif
}
#if defined PIC && DO_VERSIONING
default_symbol_version (__new_msgctl, msgctl, GLIBC_2.2);
#else
weak_alias (__new_msgctl, msgctl);
#endif