The chmod function in C under Linux

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

int main(int argc, const char* argv[])
{
    
    
    if(argc < 3)
    {
    
    
        fprintf(stderr, "%s <filename> <mode>\n", argv[0]);
        exit(1);
    }
    
    int mode = strtol(argv[2], NULL, 8);
    int ret = chmod(argv[1], mode);
    if(ret == -1)
    {
    
    
        perror("chmod");
        exit(1);
    }

    ret = chown(argv[1], 1000, 1000);
    if(ret == -1)
    {
    
    
        perror("chown");
        exit(1);
    }
    
    return 0;
}

Test Results