ftok implementation test

ftoktest.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/types.h>
#include <sys/stat.h>

void touch(char *file_name) {
    FILE *fp;
    if ((fp = fopen(file_name, "w")) == NULL) {
        perror("fopen");
        exit(1);
    }
    fclose(fp);
}

int main() {
    char template[] = "./tmpfileXXXXXX";
    int fd;
    key_t key;

    // Generate the random pathname using mkstemp()
    if ((fd = mkstemp(template)) == -1) {
        perror("mkstemp");
        return 1;
    }
    printf("Random pathname: %s\n", template);

    // Use the key generated by ftok
    if ((key = ftok(template, 'R')) == -1) {
        perror("ftok");
        return 1;
    }
    printf("%s Key: %d\n", template, key);

    // Unlink the file
    if (unlink(template) == -1) {
        perror("unlink");
        return 1;
    }
    printf("File unlinked\n");

    // Touch the file with the same filename
    touch(template);
    printf("File touched\n");

    // Use the key generated by ftok again
    if ((key = ftok(template, 'R')) == -1) {
        perror("ftok");
        return 1;
    }
    printf("%s Key: %d\n", template, key);

    // Close the file descriptor
    close(fd);
    // Unlink the file
    if (unlink(template) == -1) {
        perror("unlink");
        return 1;
    }
    printf("File unlinked\n");


    return 0;
}