three.c~

文件拷贝 在linux环境下开发的程序 虽然很简单

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <linux/sem.h>
#include <linux/shm.h>


int main( int   argc,
          char *argv[] )
{
	pid_t p1,p2,p3,p4;
	pid_t	t1,t2,t3,t4;
	int status;
	
	if((p1=fork())==0)	{
			execv("./first",NULL);
			}else {
				if((p2=fork())==0)	{
					execv("./second",NULL);
					}else{
						if((p3=fork())==0)	{
						execv("./third",NULL);
						}else{
						waitpid(p1,&status,0);
						waitpid(p2,&status,0);
						waitpid(p3,&status,0);
						}
					}
			}
    

    return 0;
}