54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
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#include <unistd.h>
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#include <stdio.h>
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#include <time.h>
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#include <stdlib.h>
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int main(){
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__pid_t pid;
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//父进程输出
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printf("P1:I am father process,PID=%d,PPID=%d\n", getpid(), getppid());
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//生成子进程
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pid = fork();
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//父进程
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if(pid != 0){
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//pid判断归零
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pid = 0;
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pid = fork();
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//子进程
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if (pid == 0){
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printf("P12:I am young brother process,PID=%d,PPID=%d\n", getpid(), getppid());
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//此时pid为0，继续生成子进程
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pid = fork();
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if (pid == 0){
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printf("P121:我的学号是2024414290124,PID=%d,PPID=%d\n", getpid(), getppid());
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}
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//父进程
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else{
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//pid判断归零
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pid = 0;
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pid = fork();
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//子进程
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if (pid == 0){
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printf("P122:我的姓名是吕锦中,PID=%d,PPID=%d\n", getpid(), getppid());
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}
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//父进程
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else{
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}
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}
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}
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//父进程
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else{
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}
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}
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//子进程
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else{
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time_t t = time(NULL);
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printf("P11:当前时间是：%s,PID=%d,PPID=%d\n", ctime(&t), getpid(), getppid());
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}
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}
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