/*********************************************************************************
 *      Copyright:  (C) 2025 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  limit.c
 *    Description:  This file is setrlimit() example program.
 *
 *        Version:  1.0.0(10/28/2025)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "10/28/2025 10:40:37 AM"
 *
 ********************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>

int main(void)
{
    struct rlimit limit;

    /* 获取当前限制 */
    getrlimit(RLIMIT_NOFILE, &limit);
    printf("Max. fd limite: soft=%ld, hard=%ld\n", limit.rlim_cur, limit.rlim_max);

    /* 修改软限制为最多可打开的文件描述个数(硬限制)  */
    limit.rlim_cur = limit.rlim_max;

    /* 设置当前限制 */
    if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
        perror("setrlimit");
        exit(EXIT_FAILURE);
    }

    printf("Max. fd set to %ld successfully!\n", limit.rlim_cur);

    return 0;
}