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 #define MANY 80
11
12 int
main(int argc,char * argv[])13 main(int argc, char *argv[])
14 {
15 fd_set write_fds;
16 int fd[MANY+3], i, maxfd;
17
18 FD_ZERO(&write_fds);
19 for (i = 0; i < MANY; ++i) {
20 if ((fd[i] = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
21 err(EX_OSERR, "socket(2) failure");
22
23 FD_SET(fd[i], &write_fds);
24 maxfd = fd[i];
25 }
26
27 i = select(maxfd+1, NULL, &write_fds, NULL, NULL);
28
29 if (i == MANY)
30 printf("ok\n");
31
32 return (0);
33 }
34