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d4697bc9 | 1 | /* Copyright (C) 1995-2014 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 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 18 | |
e9dcb080 | 19 | #include <errno.h> |
d2f5be2a | 20 | #include <sys/msg.h> |
973209d8 | 21 | #include <ipc_priv.h> |
28f540f4 | 22 | |
6ee8d334 | 23 | #include <sysdep-cancel.h> |
e9dcb080 UD |
24 | #include <sys/syscall.h> |
25 | ||
977bfd77 UD |
26 | /* Kludge to work around Linux' restriction of only up to five |
27 | arguments to a system call. */ | |
28 | struct ipc_kludge | |
29 | { | |
70d9946a | 30 | void *msgp; |
977bfd77 UD |
31 | long int msgtyp; |
32 | }; | |
33 | ||
34 | ||
a5852807 | 35 | ssize_t |
6166815d | 36 | __libc_msgrcv (msqid, msgp, msgsz, msgtyp, msgflg) |
d2f5be2a UD |
37 | int msqid; |
38 | void *msgp; | |
39 | size_t msgsz; | |
3e5f5557 | 40 | long int msgtyp; |
d2f5be2a UD |
41 | int msgflg; |
42 | { | |
43 | /* The problem here is that Linux' calling convention only allows up to | |
44 | fives parameters to a system call. */ | |
45 | struct ipc_kludge tmp; | |
28f540f4 | 46 | |
a2da1673 | 47 | tmp.msgp = msgp; |
d2f5be2a UD |
48 | tmp.msgtyp = msgtyp; |
49 | ||
6ee8d334 | 50 | if (SINGLE_THREAD_P) |
70d9946a | 51 | return INLINE_SYSCALL (ipc, 5, IPCOP_msgrcv, msqid, msgsz, msgflg, &tmp); |
6ee8d334 UD |
52 | |
53 | int oldtype = LIBC_CANCEL_ASYNC (); | |
54 | ||
a5852807 | 55 | ssize_t result = INLINE_SYSCALL (ipc, 5, IPCOP_msgrcv, msqid, msgsz, msgflg, |
70d9946a | 56 | &tmp); |
6ee8d334 UD |
57 | |
58 | LIBC_CANCEL_RESET (oldtype); | |
59 | ||
60 | return result; | |
d2f5be2a | 61 | } |
6166815d | 62 | weak_alias (__libc_msgrcv, msgrcv) |