使用C語言根據程序名檢查程序是否存在，然後重啟程序

/*
*  COPYRIGHT NOTICE
*  Copyright (C) 2016 HuaHuan Electronics Corporation, Inc. All rights reserved
*
*  Author       	:Kevin_fzs
*  File Name        	:/home/kevin/works/projects/MIPS53003/drivers/webRestart.c
*  Create Date        	:2016/08/04 01:11
*  Last Modified      	:2016/08/04 01:11
*  Description    	:
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int getRestartStatus()
{
	char *name="/home/webserver/Rflag.txt";	
	FILE *fd;
	int ret=0;	

	fd = fopen(name, "r");
	if(NULL == fd)
		return 1;
	else
		return 0;
}

int main()
{
	FILE *ptr = NULL;
	char cmd[128] = "ps -ef | grep appweb | grep -v grep | wc -l";
	int status = 0;
	char buf[150];
	int count;
	
	while(1)
	{
		status = getRestartStatus();<span style="white-space:pre">				</span>//根據標誌檔案來決定是否要檢查程序
		if(status)
		{
			if((ptr = popen(cmd, "r"))==NULL)
			{
				printf("popen err\n");	
				continue;
			}

			memset(buf, 0, sizeof(buf));

			if((fgets(buf, sizeof(buf),ptr))!= NULL)<span style="white-space:pre">		</span>//獲取程序和子程序的總數
			{
				count = atoi(buf);
				if(count <= 0)<span style="white-space:pre">			</span>//當程序數小於等於0時，說明程序不存在
				{
					system("/home/appweb_start.sh");
					printf("restart appweb \n");
				}
					
			}
			
		}
		usleep(200000);
	}
}