多进程测试

代码

多进程

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main()
{
 char *arglist[3];
 int pid;
 arglist[0] = "r06";
 arglist[2] = 0 ;
 pid = fork();
 if(pid == -1){  
  perror("fork");
 }else if (pid == 0){
  arglist[1] = "-o" ;  
  printf("parent pid= %d, my pid=%d\n", getppid(), getpid());
  execvp("/home/r06",arglist);
  exit(0);
 }
 else
 {
  arglist[1] = "-e" ;
     printf("I am the parent. my child is %d\n", pid);  
                execvp("/home/r06",arglist);
  sleep(2);
  exit(0);
 }
 return 0;
}

r06

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include <unistd.h>
#include <string.h>
int main(int argc, char *argv[])
{
    if(argc<=1)
     printf("error");
    int n=rand();
    if(strcmp(argv[1],"-e")==0)
    {
n=rand()*2;
 printf("%d",n); 
    }
    else if(strcmp(argv[1],"-o")==0)
    {
n=rand()*2+1;
    }
      printf("%d\n",n);
    return 0;
}

截图