1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
dnl @synopsis AX_MSG_WAITFORONE
dnl @summary Test if the libc/kernel have working recvmmsg MSG_WAITFORONE implementation
dnl @category Misc
dnl
dnl We need recvmmsg to support MSG_WAITFORONE. RHEL 6 (and derivates)
dnl are know for broken implementation
dnl
dnl @version 2013-03-12
dnl @license GPL
dnl @author Ondřej Surý <ondrej@sury.org> and Marek Vavruša <marek@vavrusa.com>
AC_DEFUN([AX_MSG_WAITFORONE],
[
AC_REQUIRE([AC_PROG_CC])
AC_LANG_PUSH([C])
AC_CACHE_CHECK([for recv_mmsg support], [ax_cv_have_msg_waitforone],
[
AC_RUN_IFELSE(
[
AC_LANG_PROGRAM(
[[
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
volatile int _intr = 0;
void sighandle(int s) {
_intr = 1;
}
]],[[
#ifndef MSG_WAITFORONE
return 3; /* Not supported. */
#else
int port = 35353;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) return 1;
struct mmsghdr msgs[2];
struct iovec iovecs[2];
char bufs[2][64];
unsigned i = 0;
memset(msgs, 0, sizeof(msgs));
for (i = 0; i < 2; i++) {
iovecs[i].iov_base = bufs[i];
iovecs[i].iov_len = 64;
msgs[i].msg_hdr.msg_iov = &iovecs[i];
msgs[i].msg_hdr.msg_iovlen = 1;
}
struct sockaddr_in sa; /* Bind to socket. */
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sa.sin_port = htons(port); /* Find free port. */
while (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
if (errno == EADDRINUSE) sa.sin_port = ++port;
else break;
}
int cfd = socket(AF_INET, SOCK_DGRAM, 0); /* Send datagram. */
char pkt[32] = { '\xdf' };
sendto(cfd, pkt, sizeof(pkt), 0, (struct sockaddr*)&sa, sizeof(sa));
/* Broken implementation doesn't respect recvmmsg timeout. */
struct sigaction aset;
memset(&aset, 0, sizeof(struct sigaction));
aset.sa_handler = sighandle;
sigaction(SIGALRM, &aset, NULL);
alarm(1);
int ret = recvmmsg(fd, msgs, 2, MSG_WAITFORONE, NULL);
close(cfd);
close(fd);
if (ret < 0) { /* Completely failed. */
return 2;
}
return _intr; /* OK if not interrupted. */
#endif
]])],
[ax_cv_have_msg_waitforone=yes],
[ax_cv_have_msg_waitforone=no],
[ax_cv_have_msg_waitforone=no])])
AC_LANG_POP([C])
])
|
