mount.c

#include <sys/mount.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

int main(void) {
        int ret;
        while (1) {
                ret = mount("/dev/sdc", "/mnt", "ext4",
                            MS_MGC_VAL | MS_RDONLY | MS_NOSUID, "");
                if (ret < 0)
                        fprintf(stderr, "%s\n", strerror(errno));
                sleep(1);
                ret = umount("/mnt");
                if (ret < 0)
                        fprintf(stderr, "%s\n", strerror(errno));
        }
}