請(qǐng)各位大俠看看為什么這個(gè)程序沒(méi)有正常退出

h_virus

函數(shù)源碼：
#include <stdio.h>
#include <unistd.h>
int main()
{
    int x = 0, fd[2] = {0};
        char buf[30] = {0}, s[30] = {0};
        pipe(fd);
        while (-1 == (x = fork()));
        if (0 == x) {
                #if 0
            sprintf(buf, "This is message from child\r\n");
                write(fd[1], buf, 30);
                #endif
               
        } else {
            #if 0
            wait(0);
                read(fd[0], s, 30);
                printf("childPID is %d, message%s", x, s);
                #endif
            sprintf(buf, "This is message from Father\r\n");
                write(fd[1], buf, 30);

        }
        if (0 == x) {
            wait(0);
                read(fd[0], s, 30);
                printf("childPID is %d, message%s", x, s);
                //exit(0);
        }
        exit(0);
}

為什么在linux編譯運(yùn)行后，沒(méi)有正常退出呢？
[root@localhost c_testy]# childPID is 0, messageThis is message from Father//程序卡在這個(gè)地方，沒(méi)有出現(xiàn)下面的命令行提示符呢
[root@localhost c_testy]#

pandaiam

樓主你的程序太過(guò)高深..
俺看不懂啊..

mirnshi

僵尸

pandaiam

In UNIX System terminology, a process that has terminated, but whose parent has not yet waited for it, is called a zombie.

If we write a long-running program that forks many child processes, they become zombies unless we wait for them and fetch their termination status.

請(qǐng)教樓上.apue上是這麼說(shuō)的.

但是,父進(jìn)程終止后,子進(jìn)程不是被init領(lǐng)養(yǎng)了嗎...

davelv

樓主發(fā)上來(lái)的時(shí)候可以把#if 0 #endif中間的東西都去掉。

folklore

wait(0); ???

怎么能Wait 0呢？

Parent:Wait(X)

h_virus

回復(fù) 6# folklore
我現(xiàn)在改成如下，怎么還是卡在那不動(dòng)呢，為什么啊

    int main()
{
    int x = 0, fd[2] = {0};
        char buf[30] = {0}, s[30] = {0};
        pipe(fd);
        while (-1 == (x = fork()));
        if (0 == x) {
               
        } else {
            sprintf(buf, "This is message from Father\r\n");
                write(fd[1], buf, 30);

        }
        if (0 == x) {
            //wait(0);
                read(fd[0], s, 30);
                printf("childPID is %d, message%s", x, s);
                exit(0);
        }
        exit(0);
}

zhangsuozhu

呵呵。剛才看錯(cuò)了！

folklore

1. 
   
2. int main()
   
3. {
   
4.         int x = 0, fd[2];
   
5.         char buf[30] = {0}, s[30] = {0};
   
6.         pipe(fd);
   
7.         while (-1 == (x = fork()));
   
8.         if (0 == x) {
   
9.             close(fd[1]);
   
10.             read(fd[0], s, 30);
    
11.             printf("childPID is %d, message%s", x, s);
    
12.             exit(0);               
    
13.         } else {
    
14.             close(fd[0]);
    
15.             sprintf(buf, "This is message from Father\r\n");
    
16.             write(fd[1], buf, 30);
    
17.         }
    
18.         wait(x);
    
19.         exit(0);
    
20. }
    

復(fù)制代碼

手上沒(méi)有Unix系統(tǒng)，沒(méi)發(fā)現(xiàn)什么錯(cuò)誤,試試

h_virus

回復(fù) 9# folklore


    大俠英明啊