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