#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>

#define BUFSIZE 1000

int main()
{
	FILE *fp;
	char *cmd = "ps -ef";
	char buf[BUFSIZE];
	buf[BUFSIZE] = '\0';	
	if((fp=popen(cmd,"r"))==NULL)
		perror("popen");
	while((fgets(buf,BUFSIZE,fp))!=NULL)
		printf("%s",buf);
	pclose(fp);
	exit(0);
}