Question

谁能告诉我这有什么问题？我仍然是分叉的新手。计算机执行第1和第2，但第3个是wc不起作用。急需帮助。终端返回多个子进程已完成但没有wc。

pid_t son;
int i;

for (i=0; i<=3; i++){
        switch (i){
            case 0:
            son = fork();
                if (son<0){
                    fprintf(stderr, "Fork failed!");
                    //exit(-1);
                }else if (son == 0){
                    execlp("/bin/cat", "cat", "wctrial.txt", NULL);
                    exit(0);
                }else{
                wait(NULL);
                printf("Child process completed!");

                }
            case 1:
            son = fork();
                if (son<0){
                    fprintf(stderr, "Fork failed!");
                    //exit(-1);
                }else if (son == 0){
                    execlp("/bin/mkdir", "mkdir", "mydirectory", NULL);
                    exit(0);
                }else{
                wait(NULL);
                printf("Child process completed!");
                }
            case 2:
            son = fork();
                if (son<0){
                    fprintf(stderr, "Fork failed!");
                    //exit(-1);
                }else if (son == 0){
                    printf("Work!");
                    execlp("usr/bin/wc","wc","-w","wctrial.txt", NULL);
                    exit(0);
                }else{
                wait(NULL);
                printf("Work!");
                printf("Child process completed!");
                exit(0);
                }
        }
}

}

Answer 1

由于对mark a comment as an answer的功能请求仍然被拒绝，我在此处复制上述解决方案。

你忘记了路径中的主要斜线。 - Joachim Pileborg

＆＃34; USR /斌/ WC＆＃34;应该是＆＃34; / usr / bin / wc＆＃34; - Basile Starynkevitch

WC没有执行任何操作

1 个答案: