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a334319f | 1 | /* Copyright (C) 1995, 1997, 1998, 2000, 2002 Free Software Foundation, Inc. |
3e5f5557 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995. | |
28f540f4 | 4 | |
3e5f5557 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 9 | |
3e5f5557 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
28f540f4 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
28f540f4 | 19 | |
e9dcb080 | 20 | #include <errno.h> |
d2f5be2a | 21 | #include <sys/msg.h> |
973209d8 | 22 | #include <ipc_priv.h> |
28f540f4 | 23 | |
6ee8d334 | 24 | #include <sysdep-cancel.h> |
e9dcb080 UD |
25 | #include <sys/syscall.h> |
26 | ||
d25c879d | 27 | #include <bp-checks.h> |
977bfd77 UD |
28 | |
29 | /* Kludge to work around Linux' restriction of only up to five | |
30 | arguments to a system call. */ | |
31 | struct ipc_kludge | |
32 | { | |
d25c879d | 33 | void *__unbounded msgp; |
977bfd77 UD |
34 | long int msgtyp; |
35 | }; | |
36 | ||
37 | ||
a334319f | 38 | int |
6166815d | 39 | __libc_msgrcv (msqid, msgp, msgsz, msgtyp, msgflg) |
d2f5be2a UD |
40 | int msqid; |
41 | void *msgp; | |
42 | size_t msgsz; | |
3e5f5557 | 43 | long int msgtyp; |
d2f5be2a UD |
44 | int msgflg; |
45 | { | |
46 | /* The problem here is that Linux' calling convention only allows up to | |
47 | fives parameters to a system call. */ | |
48 | struct ipc_kludge tmp; | |
28f540f4 | 49 | |
d25c879d | 50 | tmp.msgp = CHECK_N (msgp, msgsz); |
d2f5be2a UD |
51 | tmp.msgtyp = msgtyp; |
52 | ||
6ee8d334 UD |
53 | if (SINGLE_THREAD_P) |
54 | return INLINE_SYSCALL (ipc, 5, IPCOP_msgrcv, msqid, msgsz, msgflg, | |
55 | __ptrvalue (&tmp)); | |
56 | ||
57 | int oldtype = LIBC_CANCEL_ASYNC (); | |
58 | ||
a334319f UD |
59 | int result = INLINE_SYSCALL (ipc, 5, IPCOP_msgrcv, msqid, msgsz, msgflg, |
60 | __ptrvalue (&tmp)); | |
6ee8d334 UD |
61 | |
62 | LIBC_CANCEL_RESET (oldtype); | |
63 | ||
64 | return result; | |
d2f5be2a | 65 | } |
6166815d | 66 | weak_alias (__libc_msgrcv, msgrcv) |