wait()函数,作用：阻塞等待任意子进程，回收子进程8kb物理内存

#include<stdio.h>#include<stdlib.h>#include <unistd.h>//wait()函数//作用：阻塞等待任意子进程，回收子进程8kb物理内存int main(void){    printf("main process pid = %d\n",getpid());    pid_t pid;    pid = fork();//创建子进程    if(pid < 0)    {        perror("fork error");        exit(1);//结束进程    }    if(pid == 0)    {        printf("子进程pid = %d\n",getpid());        sleep(1);        printf("********\n");        exit(1);    }    if(pid > 0)    {        printf("父进程pid = %d\n",getpid());        //阻塞等待任意子进程，回收子进程8kb物理内存        wait(NULL);        printf("-------------\n");        exit(1);    }    return 0;}/*$ ./a.outmain process pid = 25446父进程pid = 25446子进程pid = 25447********-------------*/