1 #include <err.h>
2 #include <stdio.h>
3 #include <string.h>
4 #include <sysexits.h>
5 #include <netinet/in.h>
6 #include <sys/select.h>
7 #include <sys/socket.h>
8 #include <sys/types.h>
9
10 int
main(int argc,char * argv[])11 main(int argc, char *argv[])
12 {
13 struct sockaddr_in sa_local, sa_remote;
14 socklen_t sin_size = sizeof(struct sockaddr_in);
15 fd_set exceptfds;
16 struct timeval timeout;
17 int fd_l, fd_c, fd_n, i;
18
19 if ((fd_l = socket(PF_INET, SOCK_STREAM, 0)) == -1)
20 err(EX_OSERR, "socket(2) failure");
21
22 if ((fd_c = socket(PF_INET, SOCK_STREAM, 0)) == -1)
23 err(EX_OSERR, "socket(2) failure");
24
25 sa_local.sin_family = AF_INET;
26 sa_local.sin_port = 0;
27 sa_local.sin_addr.s_addr = htonl(INADDR_ANY);
28 memset(&(sa_local.sin_zero), 0, sizeof(sa_local.sin_zero));
29
30 if (bind(fd_l, (struct sockaddr *)&sa_local, sizeof(struct sockaddr)) == -1)
31 err(EX_OSERR, "bind(2) failure");
32
33 if (getsockname(fd_l, (struct sockaddr *)&sa_local, &sin_size) == -1)
34 err(EX_OSERR, "getsockname(2) failure");
35
36 if (listen(fd_l, 1) == -1)
37 err(EX_OSERR, "listen(2) failure");
38
39 if (connect(fd_c, (struct sockaddr *)&sa_local, sizeof(struct sockaddr)) == -1)
40 err(EX_OSERR, "connect(2) failure");
41
42 fd_n = accept(fd_l, (struct sockaddr *)&sa_remote, &sin_size);
43
44 FD_ZERO(&exceptfds);
45 FD_SET(fd_n, &exceptfds);
46
47 if (send(fd_c, "x", 1, MSG_OOB) == -1)
48 err(EX_OSERR, "send(2) failure");
49
50 memset(&timeout, 0, sizeof(timeout));
51 i = select(fd_n+1, NULL, NULL, &exceptfds, &timeout);
52
53 if (i == 1)
54 printf("ok\n");
55
56 return (0);
57 }
58