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