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/* Copyright (C) 1995-2013 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sys/msg.h>
#include <ipc_priv.h>
#include <sysdep-cancel.h>
#include <sys/syscall.h>
#include <bp-checks.h>
/* Kludge to work around Linux' restriction of only up to five
arguments to a system call. */
struct ipc_kludge
{
void *__unbounded msgp;
long int msgtyp;
};
ssize_t
__libc_msgrcv (msqid, msgp, msgsz, msgtyp, msgflg)
int msqid;
void *msgp;
size_t msgsz;
long int msgtyp;
int msgflg;
{
/* The problem here is that Linux' calling convention only allows up to
fives parameters to a system call. */
struct ipc_kludge tmp;
tmp.msgp = CHECK_N (msgp, msgsz);
tmp.msgtyp = msgtyp;
if (SINGLE_THREAD_P)
return INLINE_SYSCALL (ipc, 5, IPCOP_msgrcv, msqid, msgsz, msgflg,
__ptrvalue (&tmp));
int oldtype = LIBC_CANCEL_ASYNC ();
ssize_t result = INLINE_SYSCALL (ipc, 5, IPCOP_msgrcv, msqid, msgsz, msgflg,
__ptrvalue (&tmp));
LIBC_CANCEL_RESET (oldtype);
return result;
}
weak_alias (__libc_msgrcv, msgrcv)
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