Fork（）编程，创建2个子进程，实验内容

很简单，打印父进程pid，然后创建子进程，并打印子进程pid，然后再创建一个子进程，并打印pid。

#include
#include
#include

int main()
{
int pid1, pid2;

printf("Parent's PID is %d\n", getpid());

pid1 = fork();

if (pid1 == 0)
{
printf("Child1's PID is %d\n", getpid());
exit(0);
}
else if(pid1 < 0)
{
printf("fork error!\n");
exit(1);
}

wait(NULL);
printf("Child1 (PID=%d) already exit\n", pid1);

pid2 = fork();

if (pid2 == 0)
{
printf("Child2's PID is %d\n", getpid());
exit(0);
}
else if(pid2 < 0)
{
printf("fork error!\n");
exit(1);
}

wait(NULL);
printf("Child2 (PID=%d) already exit\n", pid2);

return 0;
}