67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*************************************************************************
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> File Name : fork_test.c
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> Author : TL Song
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> EMail : songtianlun@frytea.com
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> Created Time : Wed 23 Dec 2020 08:46:47 AM CST
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************************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#include <time.h>
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/* IPC */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/shm.h>
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int main(int arg,char* argv[]) {
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int i = 0;
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time_t t;
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struct tm *timeinfo;
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// int 被 typedef为 pid_t
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pid_t pid=fork();
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// 当pid==0时，是子进程代码运行区域。其他则是父进程运行区域。
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if(pid<0) {
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printf("Create child process failure ...\n");
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}else if(pid==0) {
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//子进程执行体
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printf("Hi i am child process ,my processId is %i \n",getpid());
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i = 0;
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while (1) {
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sleep(1);
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time(&t);
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timeinfo = localtime(&t);
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printf("Child: %d %s\n", i++, asctime(timeinfo));
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fflush(stdout);
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if(i>100)
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break;
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}
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}
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else{
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//父进程执行体
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printf("parent process is run ,myid is %i \n",getpid());
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i = 0;
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while (1) {
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sleep(1);
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time(&t);
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timeinfo = localtime(&t);
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printf("Main : %d %s\n", i++, asctime(timeinfo));
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fflush(stdout);
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if(i>100)
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break;
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}
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}
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// 执行体结束标志
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if(pid==0) {
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printf("pid=%i child process end ... \n",getpid());
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}
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else {
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// 睡眠5s,等待子先进程结束
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sleep(5);
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printf("pid=%i Parent process End ... \n",getpid());
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}
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return 0;
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}
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