name_to_handle_at system call example (found mnt_id by path)

t_name_to_handle_at.c

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

int main(int argc, char** argv) {
        struct file_handle* handle;
        int mnt_id;

        if(argc < 2)
                return 1;

        handle = (struct file_handle*)malloc(sizeof(struct file_handle) + MAX_HANDLE_SZ);
        handle->handle_bytes = MAX_HANDLE_SZ;

        if(name_to_handle_at(AT_FDCWD, argv[1], handle, &mnt_id, AT_EMPTY_PATH | AT_SYMLINK_FOLLOW)<0) {
                perror("name_to_handle_at");
                return 1;
        }

        printf("%s %d\n", argv[1], mnt_id);

        free(handle);

        return 0;
}