fork1.c

嵌入式Linux程序设计与应用案例 电子书源码 中国电力出版社

/**************
// name : fork1.c
// author : pyy
// date : 2007-11-22
***************/

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

int main()
{
    pid_t child=2;
    int ans;
    char str0[240],str1[60],str2[60],str3[60],str4[60];
    printf("是否要执行复制进程? (1 yes 2 no):");
    scanf("%d",&ans);
    if(ans == 1)
    {
        child = fork(); //copy process
        if(child == -1) { perror("fork error\n"); exit(1);}
    }
    
    strcpy(str1,"one :what a beautiful view!\n");
    strcpy(str2,"two : Three buildings are worth seeing.\n");
    strcpy(str3,"three: I'd like to look around the city.\n");
    strcpy(str4,"four: Would you recommend some famous \n");
    strcpy(str0,"");
   /* child process*/
    if(child == 0)
    {
        puts(" child process.....:");
        printf("\t child pid = %d\n",getpid());
        printf("\t child ppid = %d\n",getppid());
        strcat(str0,str1);
        strcat(str0,str2);
        printf("%s",str0);
        printf(" the length of string is %d\n ",strlen(str0));
        exit(0);
    }
    else
    {
        puts(" father process.....:");
        printf("\t father pid = %d\n",getpid());
        printf("\t father ppid = %d\n",getppid());
        strcat(str0,str3);
        strcat(str0,str4);
        printf("%s",str0);
        printf(" the length of string is %d\n ",strlen(str0));
        exit(0);
       
    }
}