/*********************************************************************************
 *      Copyright:  (C) 2025 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  access.c
 *    Description:  This file is access() example
 *                 
 *        Version:  1.0.0(10/15/2025)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "10/15/2025 02:43:08 PM"
 *                 
 ********************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

int main(int argc, char *argv[])
{
    const char *file = argv[1];

    if (argc != 2)
    {
        fprintf(stderr, "Usage: %s <file_path>\n", argv[0]);
        return 1;
    }

    if (access(file, F_OK) == -1)
    {
        fprintf(stderr, "cannot access '%s': %s\n", file, strerror(errno));
        return 1;
    }

    if (access(file, R_OK) == 0)
    {
        printf("Read  OKAY\n");
    }
    else
    {
        printf("Read  FAIL: (%s)\n", strerror(errno));
    }

    if (access(file, W_OK) == 0)
    {
        printf("Write OKAY\n");
    }
    else
    {
        printf("Write FAIL: (%s)\n", strerror(errno));
    }

    if (access(file, X_OK) == 0)
    {
        printf("Exec  OKAY\n");
    }
    else
    {
        printf("Exec  FAIL: (%s)\n", strerror(errno));
    }

    return 0;
}