本文实例讲述了C语言实现查看进程是否存在的方法。分享给大家供大家参考，具体如下：
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#include<unistd.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<stdio.h>
#include<stdlib.h>
#include<fcntl.h>
#include<limits.h>
#define BUFSZ 150
void err_quit(char *msg)
{
perror(msg);
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
FILE* fp;
int count;
char buf[BUFSZ];
char command[150];
sprintf(command, "ps -ef | grep **** | grep -v grep | wc -l" );
if((fp = popen(command,"r")) == NULL)
err_quit("popen");
if( (fgets(buf,BUFSZ,fp))!= NULL )
{
count = atoi(buf);
if(count == 0)
printf("not found\n");
else
printf("process :tdv1 total is %d\n",count);
}
pclose(fp);
exit(EXIT_SUCCESS);
}
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希望本文所述对大家C语言程序设计有所帮助。