Linux 判断一个进程是否存在

#include    
#include    
#include    
#include    
#include    
#include    
#include    
 
#define BUFSZ 150   
 
void err_quit(char *msg);
 
 
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" );		//*****代表要监控的进程
 
	if((fp = popen(command,"r")) == NULL)   
 
		err_quit("popen");   
 
	if( (fgets(buf,BUFSZ,fp))!= NULL ) { 
 
		count = atoi(buf);   
		
		if(count  == 0)   
 
			printf("进程不存在!\n");   
		
		else  
 
			printf("进程已找到，有%d个!\n",count);   
	} 
 
	pclose(fp);   
	return EXIT_SUCCESS;
}
 
 
void err_quit(char *msg) {
 
	perror(msg);   
	exit(EXIT_FAILURE);   
}b