#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wait.h>
#include <readline/readline.h>

#define NUMPIPES 2

int main(int argc,char *argv[]) {
    char *bBuffer,*sPtr,*aPtr = NULL,*pipeComms[NUMPIPES],*cmdArgs[10];
    int fdPipe[2],pCount,aCount,i,status,lPids[NUMPIPES];
    pid_t pid;

    pipe(fdPipe);

    while(1) {
        bBuffer = readline("Shell> ");

        if(!strcasecmp(bBuffer,"exit")) {
            return 0;
        }

        sPtr = bBuffer;
        pCount = -1;

        do {
            aPtr = strsep(&sPtr,"|");
            pipeComms[++pCount] = aPtr;
        } while(aPtr);

        for(i = 0; i < pCount; i++) {
            aCount = -1;

            do {
                aPtr = strsep(&pipeComms[i]," ");
                cmdArgs[++aCount] = aPtr;
            } while(aPtr);

            cmdArgs[aCount] = 0;

            if(strlen(cmdArgs[0]) > 0) {
                pid = fork();

                if(pid == 0) {
                    if(i == 0) {
                        close(fdPipe[0]);

                        dup2(fdPipe[1],STDOUT_FILENO);

                        close(fdPipe[1]);
                    } else if(i == 1) {
                        close(fdPipe[1]);

                        dup2(fdPipe[0],STDIN_FILENO);

                        close(fdPipe[0]);
                    }

                    execvp(cmdArgs[0],cmdArgs);
                    exit(1);
                } else {
                    lPids[i] = pid;

                    /*waitpid(pid,&status,0);

                    if(WIFEXITED(status)) {
                        printf("[%d] TERMINATED (Status: %d)\n",pid,WEXITSTATUS(status));
                    }*/
                }
            }
        }

        for(i = 0; i < pCount; i++) {
            waitpid(lPids[i],0);

            if(WIFEXITED(status)) {
                printf("[%d] TERMINATED (Status: %d)\n",lPids[i],WEXITSTATUS(status));
            }
        }
    }

    return 0;
}

(代码更新,以反映他提出的两个答案下面的变化,它仍然不工作,因为它应该…)

以下是测试用例：

nazgulled ~/Projects/SO/G08 $ls -l
total 8
-rwxr-xr-x 1 nazgulled nazgulled  7181 2009-05-27 17:44 a.out
-rwxr-xr-x 1 nazgulled nazgulled   754 2009-05-27 01:42 data.h
-rwxr-xr-x 1 nazgulled nazgulled  1305 2009-05-27 17:50 main.c
-rwxr-xr-x 1 nazgulled nazgulled   320 2009-05-27 01:42 makefile
-rwxr-xr-x 1 nazgulled nazgulled 14408 2009-05-27 17:21 prog
-rwxr-xr-x 1 nazgulled nazgulled  9276 2009-05-27 17:21 prog.c
-rwxr-xr-x 1 nazgulled nazgulled 10496 2009-05-27 17:21 prog.o
-rwxr-xr-x 1 nazgulled nazgulled    16 2009-05-27 17:19 test
nazgulled ~/Projects/SO/G08 $./a.out 
Shell> ls -l|grep prog
[4804] TERMINATED (Status: 0)
-rwxr-xr-x 1 nazgulled nazgulled 14408 2009-05-27 17:21 prog
-rwxr-xr-x 1 nazgulled nazgulled  9276 2009-05-27 17:21 prog.c
-rwxr-xr-x 1 nazgulled nazgulled 10496 2009-05-27 17:21 prog.o

问题是我应该回到我的shell之后,我应该看到“Shell>”等待更多的输入.您还可以注意到,您没有看到类似于“[4804] TERMINATED(Status：0)”(但使用不同的pid)的消息,这意味着第二个进程没有终止.

我认为这与grep有关,因为这有用：

nazgulled ~/Projects/SO/G08 $./a.out 
Shell> echo q|sudo fdisk /dev/sda
[4838] TERMINATED (Status: 0)

The number of cylinders for this disk is set to 1305.
There is nothing wrong with that,but this is larger than 1024,and could in certain setups cause problems with:
1) software that runs at boot time (e.g.,old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g.,DOS FDISK,OS/2 FDISK)

Command (m for help): 
[4839] TERMINATED (Status: 0)

你可以很容易地看到两个“终止”消息…

那么我的代码怎么了？