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b168057a | 1 | /* Copyright (C) 2010-2015 Free Software Foundation, Inc. |
3d04ff3a AS |
2 | This file is part of the GNU C Library. |
3 | Contributed by Andreas Schwab <schwab@redhat.com>, 2010. | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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/>. */ | |
3d04ff3a AS |
18 | |
19 | #include <errno.h> | |
20 | #include <sys/socket.h> | |
21 | ||
22 | #include <sysdep-cancel.h> | |
23 | #include <sys/syscall.h> | |
24 | #include <kernel-features.h> | |
25 | ||
0e31b18c JM |
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 | |
32 | # undef __NR_recvmmsg | |
33 | #endif | |
3d04ff3a AS |
34 | |
35 | #ifdef __NR_recvmmsg | |
36 | int | |
37 | recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags, | |
20e5a5f7 | 38 | struct timespec *tmo) |
3d04ff3a AS |
39 | { |
40 | if (SINGLE_THREAD_P) | |
41 | return INLINE_SYSCALL (recvmmsg, 5, fd, vmessages, vlen, flags, tmo); | |
42 | ||
43 | int oldtype = LIBC_CANCEL_ASYNC (); | |
44 | ||
45 | int result = INLINE_SYSCALL (recvmmsg, 5, fd, vmessages, vlen, flags, tmo); | |
46 | ||
47 | LIBC_CANCEL_RESET (oldtype); | |
48 | ||
49 | return result; | |
50 | } | |
51 | #elif defined __NR_socketcall | |
0e31b18c | 52 | # ifndef __ASSUME_RECVMMSG_SOCKETCALL |
3d04ff3a AS |
53 | extern int __internal_recvmmsg (int fd, struct mmsghdr *vmessages, |
54 | unsigned int vlen, int flags, | |
20e5a5f7 | 55 | struct timespec *tmo) |
3d04ff3a AS |
56 | attribute_hidden; |
57 | ||
58 | static int have_recvmmsg; | |
59 | ||
60 | int | |
61 | recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags, | |
20e5a5f7 | 62 | struct timespec *tmo) |
3d04ff3a | 63 | { |
a1ffb40e | 64 | if (__glibc_likely (have_recvmmsg >= 0)) |
3d04ff3a AS |
65 | { |
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) | |
70 | && have_recvmmsg == 0 | |
71 | && errno == EINVAL) | |
72 | { | |
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 | |
76 | immediately. */ | |
77 | ret = __internal_recvmmsg (-1, 0, 0, 0, 0); | |
78 | if (errno == EINVAL) | |
79 | { | |
80 | have_recvmmsg = -1; | |
81 | __set_errno (ENOSYS); | |
82 | } | |
83 | else | |
84 | { | |
85 | have_recvmmsg = 1; | |
86 | __set_errno (EINVAL); | |
87 | } | |
88 | return -1; | |
89 | } | |
90 | return ret; | |
91 | } | |
92 | __set_errno (ENOSYS); | |
93 | return -1; | |
94 | } | |
95 | # else | |
0e31b18c JM |
96 | /* When __ASSUME_RECVMMSG_SOCKETCALL recvmmsg is defined in |
97 | internal_recvmmsg.S. */ | |
3d04ff3a AS |
98 | # endif |
99 | #else | |
123be9de | 100 | # include <socket/recvmmsg.c> |
3d04ff3a | 101 | #endif |