1 /* Copyright (C) 2010-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Andreas Schwab <schwab@redhat.com>, 2010.
5 The GNU C Library is free software; you can redistribute it and/or
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.
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
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
20 #include <sys/socket.h>
22 #include <sysdep-cancel.h>
23 #include <sys/syscall.h>
24 #include <kernel-features.h>
26 /* Do not use the recvmmsg syscall on socketcall architectures unless
27 it was added at the same time as the socketcall support or can be
28 assumed to be present. */
29 #if defined __ASSUME_SOCKETCALL \
30 && !defined __ASSUME_RECVMMSG_SYSCALL_WITH_SOCKETCALL \
31 && !defined __ASSUME_RECVMMSG_SYSCALL
37 recvmmsg (int fd
, struct mmsghdr
*vmessages
, unsigned int vlen
, int flags
,
41 return INLINE_SYSCALL (recvmmsg
, 5, fd
, vmessages
, vlen
, flags
, tmo
);
43 int oldtype
= LIBC_CANCEL_ASYNC ();
45 int result
= INLINE_SYSCALL (recvmmsg
, 5, fd
, vmessages
, vlen
, flags
, tmo
);
47 LIBC_CANCEL_RESET (oldtype
);
51 #elif defined __NR_socketcall
52 # ifndef __ASSUME_RECVMMSG_SOCKETCALL
53 extern int __internal_recvmmsg (int fd
, struct mmsghdr
*vmessages
,
54 unsigned int vlen
, int flags
,
58 static int have_recvmmsg
;
61 recvmmsg (int fd
, struct mmsghdr
*vmessages
, unsigned int vlen
, int flags
,
64 if (__glibc_likely (have_recvmmsg
>= 0))
66 int ret
= __internal_recvmmsg (fd
, vmessages
, vlen
, flags
, tmo
);
67 /* The kernel returns -EINVAL for unknown socket operations.
68 We need to convert that error to an ENOSYS error. */
69 if (__builtin_expect (ret
< 0, 0)
73 /* Try another call, this time with an invalid file
74 descriptor and all other parameters cleared. This call
75 will not cause any harm and it will return
77 ret
= __internal_recvmmsg (-1, 0, 0, 0, 0);
96 /* When __ASSUME_RECVMMSG_SOCKETCALL recvmmsg is defined in
97 internal_recvmmsg.S. */
100 # include <socket/recvmmsg.c>