网络工具类

• 判断指定IP能否ping通
  https://blog.csdn.net/hinewcc/article/details/135724600

#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <string.h>

/*
*****************************************************************************************
*   函 数 名: run_ping
*   功能说明: 运行ping命令，并判断是否成功
*   形    参：无
*   返 回 值: 0：ping成功
*            -1：失败
*****************************************************************************************
*/
int run_ping(char *_pIpAddr) {
    int cnt = 0;
    int result = 0;
    pid_t pid;

    if ((pid = vfork()) < 0) {
        printf("%s: vfork error: %s\n", __FUNCTION__, strerror(errno));
        return -1;
    } else if (pid == 0) {          //子进程
        if (execlp("ping", "ping","-c","1", _pIpAddr, (char*)0) < 0) {
            printf("%s: execlp error: %s\n", __FUNCTION__, strerror(errno));
            return -1;
        }
    }

    waitpid(pid, &result, 0);
    if (WIFEXITED(result)) {
        if (WEXITSTATUS(result) != 0) {
            printf("%s: execute command: %s failed(%d)\n", __FUNCTION__, "ping", WEXITSTATUS(result));
            result = -1;
        } else {
            result = 0;
        }
    } else {
        result = 0;
    }

    if (result) {
        printf("ping %s error!\n", _pIpAddr);
        return -1;
    } else {
        printf("ping %s ok!\n", _pIpAddr);
        return 0;
    }
}

#define TEST_IP "183.2.172.185"
#define ERROR_IP "192.168.100.100"
int main(void){
    run_ping(TEST_IP);
    run_ping(ERROR_IP);
}