54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
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/* Tests for the VND driver API. Part of testvnd.sh. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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/*
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* For now, just test the most dreaded case: the driver being told to use the
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* file descriptor used to configure the device. Without appropriate checks,
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* this would cause a deadlock in VFS, since the corresponding filp object is
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* locked to perform the ioctl(2) call when VFS gets the dupfrom(2) back-call.
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*/
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int
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main(int argc, char **argv)
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{
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struct vnd_ioctl vnd;
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int fd;
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if (argc != 2) {
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fprintf(stderr, "usage: %s /dev/vnd0\n", argv[0]);
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return EXIT_FAILURE;
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}
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if ((fd = open(argv[1], O_RDONLY)) < 0) {
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perror("open");
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return EXIT_FAILURE;
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}
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memset(&vnd, 0, sizeof(vnd));
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if (ioctl(fd, VNDIOCCLR, &vnd) < 0) {
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perror("ioctl(VNDIOCCLR)");
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return EXIT_FAILURE;
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}
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vnd.vnd_fildes = fd;
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if (ioctl(fd, VNDIOCSET, &vnd) >= 0) {
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fprintf(stderr, "ioctl(VNDIOCSET): unexpected success\n");
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return EXIT_FAILURE;
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}
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if (errno != EINVAL) {
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perror("ioctl(VNDIOCSET)");
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return EXIT_FAILURE;
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}
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close(fd);
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return EXIT_SUCCESS;
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}
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