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74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/* Copyright (C) 1995, 1997, 1998, 2000, 2002 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 <sys/syscall.h>
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#include <nptl/pthreadP.h>
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#include <tls.h>
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#include <bp-checks.h>
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/* Kludge to work around Linux' restriction of only up to five
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arguments to a system call. */
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struct ipc_kludge
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{
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void *__unbounded msgp;
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long int msgtyp;
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};
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int
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__libc_msgrcv (msqid, msgp, msgsz, msgtyp, msgflg)
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int msqid;
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void *msgp;
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size_t msgsz;
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long int msgtyp;
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int msgflg;
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{
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/* The problem here is that Linux' calling convention only allows up to
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fives parameters to a system call. */
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struct ipc_kludge tmp;
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tmp.msgp = CHECK_N (msgp, msgsz);
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tmp.msgtyp = msgtyp;
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#ifndef NOT_IN_libc
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if (__builtin_expect (THREAD_GETMEM (THREAD_SELF,
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header.data.multiple_threads) == 0, 1))
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return INLINE_SYSCALL (ipc, 5, IPCOP_msgrcv, msqid, msgsz, msgflg,
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__ptrvalue (&tmp));
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int oldtype = LIBC_CANCEL_ASYNC ();
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#endif
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int result = INLINE_SYSCALL (ipc, 5, IPCOP_msgrcv, msqid, msgsz, msgflg,
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__ptrvalue (&tmp));
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#ifndef NOT_IN_libc
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LIBC_CANCEL_RESET (oldtype);
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#endif
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return result;
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}
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weak_alias (__libc_msgrcv, msgrcv)
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