1 /* Copyright (C) 2010-2016 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
,
40 return SYSCALL_CANCEL (recvmmsg
, fd
, vmessages
, vlen
, flags
, tmo
);
42 #elif defined __NR_socketcall
43 # include <socketcall.h>
44 # ifdef __ASSUME_RECVMMSG_SOCKETCALL
46 recvmmsg (int fd
, struct mmsghdr
*vmessages
, unsigned int vlen
, int flags
,
49 return SOCKETCALL_CANCEL (recvmmsg
, fd
, vmessages
, vlen
, flags
, tmo
);
52 static int have_recvmmsg
;
55 recvmmsg (int fd
, struct mmsghdr
*vmessages
, unsigned int vlen
, int flags
,
58 if (__glibc_likely (have_recvmmsg
>= 0))
60 int ret
= SOCKETCALL_CANCEL (recvmmsg
, fd
, vmessages
, vlen
, flags
,
62 /* The kernel returns -EINVAL for unknown socket operations.
63 We need to convert that error to an ENOSYS error. */
64 if (__builtin_expect (ret
< 0, 0)
68 /* Try another call, this time with an invalid file
69 descriptor and all other parameters cleared. This call
70 will not cause any harm and it will return
72 ret
= SOCKETCALL_CANCEL (invalid
, -1);
90 # endif /* __ASSUME_RECVMMSG_SOCKETCALL */
92 # include <socket/recvmmsg.c>