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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/* common.c
*
* Common helper functions for testing SO_REUSEADDR behaviour
*
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*/
#include <errno.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>
#include "common.h"
int sock_reuseaddr(void)
{
int y = 1;
int s;
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (s < 0)
die("socket(): %s\n", strerror(errno));
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &y, sizeof(y)) , 0)
die("SO_REUSEADDR: %s\n", strerror(errno));
return s;
}
/* Send a token via the given connected socket */
void send_token(int s, long token)
{
ssize_t rc;
rc = send(s, &token, sizeof(token), 0);
if (rc < 0)
die("send(): %s\n", strerror(errno));
if (rc < sizeof(token))
die("short send()\n");
}
/* Attempt to receive a token via the given socket.
*
* Returns true if we received the token, false if we got an EAGAIN, dies in any
* other case */
bool recv_token(int s, long token)
{
ssize_t rc;
long buf;
rc = recv(s, &buf, sizeof(buf), MSG_DONTWAIT);
if (rc < 0) {
if (errno == EWOULDBLOCK)
return false;
die("recv(): %s\n", strerror(errno));
}
if (rc < sizeof(buf))
die("short recv()\n");
if (buf != token)
die("data mismatch\n");
return true;
}
|
