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/* t40g.c
*
* Test select on character driver that does not support select
*
* We use /dev/zero for this right now. If the memory driver ever implements
* select support, this test should be changed to use another character driver.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <fcntl.h>
#include "common.h"
int
main(int argc, char **argv)
{
fd_set set;
int fd, retval;
/* Get subtest number */
if (argc != 2 || sscanf(argv[1], "%d", &subtest) != 1) {
printf("Usage: %s subtest_no\n", argv[0]);
exit(-2);
}
/*
* Do a select on /dev/zero, with the expectation that it will fail
* with an EBADF error code.
*/
fd = open("/dev/zero", O_RDONLY);
if (fd < 0) em(1, "unable to open /dev/zero");
FD_ZERO(&set);
FD_SET(fd, &set);
retval = select(fd + 1, &set, NULL, NULL, NULL);
if (retval != -1) em(2, "select call was expected to fail");
if (errno != EBADF) em(3, "error code other than EBADF returned");
if (!FD_ISSET(fd, &set)) em(4, "file descriptor set was modified");
exit(errct);
}
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