小编Joh*_*nes的帖子

我正在编写一个程序监视器作为操作系统课程的作业(非常基本,就像它的介绍).

监视器必须做的事情之一是显示它正在监视的程序的终止代码,如果它以"自然原因"或负责终止它的信号代码结束.

现在我只是等待孩子结束执行然后捕获终止代码.这是相关的代码段:

pid_t id = -1;
switch (id = fork()) {
    // Error when forking:
    case -1:
        error(-1, "Something went wrong when forking.");
        exit(-1);
    // Code for the child process:
    case 0:
        // Just launch the program we're asked to:
        execvp(argv[2], &argv[2]);
        // If reached here it wasn't possible to launch the process:
        error(1, "Process could not be launched.");
        exit(1);
    // Code for the parent process:
    default:
        // Just wait for the child to finish its execution:
        wait(&return_value);
} …