#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 150void 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);}