klibc/tests/select.c

/*
 * Simple test of select()
 */

#include <sys/select.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
	int fdn, fdz, pfd[2], rv;
	fd_set readset;
	struct timeval timeout;
	int err = 0;

	/* We can always read from /dev/zero; open a pipe that is never
	   ready for a "never readable" file descriptor */
	fdz = open("/dev/zero", O_RDONLY);
	pipe(pfd);
	fdn = pfd[0];

	FD_ZERO(&readset);
	FD_SET(fdn, &readset);

	timeout.tv_sec = 0;
	timeout.tv_usec = 100000;

	rv = select(FD_SETSIZE, &readset, NULL, NULL, &timeout);

	if (rv != 0) {
		fprintf(stderr,
			"select with timeout failed (rv = %d, errno = %s)\n",
			rv, strerror(errno));
		err++;
	}

	FD_ZERO(&readset);
	FD_SET(fdn, &readset);
	FD_SET(fdz, &readset);

	rv = select(FD_SETSIZE, &readset, NULL, NULL, &timeout);

	if (rv != 1 || !FD_ISSET(fdz, &readset) ||
	    FD_ISSET(fdn, &readset)) {
		fprintf(stderr,
			"select with /dev/zero failed (rv = %d, errno = %s)\n",
			rv, strerror(errno));
		err++;
	}

	return err;
}
1	niro	532	/*
2			* Simple test of select()
3			*/
4
5			#include <sys/select.h>
6			#include <fcntl.h>
7			#include <stdio.h>
8			#include <string.h>
9			#include <errno.h>
10			#include <unistd.h>
11
12			int main(int argc, char *argv[])
13			{
14			int fdn, fdz, pfd[2], rv;
15			fd_set readset;
16			struct timeval timeout;
17			int err = 0;
18
19			/* We can always read from /dev/zero; open a pipe that is never
20			ready for a "never readable" file descriptor */
21			fdz = open("/dev/zero", O_RDONLY);
22			pipe(pfd);
23			fdn = pfd[0];
24
25			FD_ZERO(&readset);
26			FD_SET(fdn, &readset);
27
28			timeout.tv_sec = 0;
29			timeout.tv_usec = 100000;
30
31			rv = select(FD_SETSIZE, &readset, NULL, NULL, &timeout);
32
33			if (rv != 0) {
34			fprintf(stderr,
35			"select with timeout failed (rv = %d, errno = %s)\n",
36			rv, strerror(errno));
37			err++;
38			}
39
40			FD_ZERO(&readset);
41			FD_SET(fdn, &readset);
42			FD_SET(fdz, &readset);
43
44			rv = select(FD_SETSIZE, &readset, NULL, NULL, &timeout);
45	niro	1297
46	niro	532	if (rv != 1 \|\| !FD_ISSET(fdz, &readset) \|\|
47			FD_ISSET(fdn, &readset)) {
48			fprintf(stderr,
49			"select with /dev/zero failed (rv = %d, errno = %s)\n",
50			rv, strerror(errno));
51			err++;
52			}
53
54			return err;
55			}