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

/*
 * This function opens a file and to trigger migration failure, unlinks the
 * file and performs graph switch (cmd passed in argv). If everything goes fine,
 * fsync should fail without crashing the mount process.
 */
int
main(int argc, char **argv)
{
    int ret = 0;
    int fd = 0;
    char *cmd = argv[1];
    struct stat stbuf = {
        0,
    };

    printf("cmd is: %s\n", cmd);
    fd = open("a.txt", O_CREAT | O_RDWR, 0644);
    if (fd < 0)
        printf("open failed: %s\n", strerror(errno));

    ret = unlink("a.txt");
    if (ret < 0)
        printf("unlink failed: %s\n", strerror(errno));
    if (write(fd, "abc", 3) < 0)
        printf("Not able to print %s\n", strerror(errno));
    system(cmd);
    sleep(1); /* No way to confirm graph switch so sleep 1 */
    ret = fstat(fd, &stbuf);
    if (ret < 0)
        printf("fstat failed %\n", strerror(errno));
    ret = fsync(fd);
    if (ret < 0)
        printf("Not able to fsync %s\n", strerror(errno));
    return 0;
}