我如何在 Perl 中生成一个进程，而不会在父进程退出时使其失效或成为僵尸？
我有一个 perl 脚本，我想生成一个进程。这可能需要一段时间，并且大多数时候父脚本将退出。我如何生成这个进程，以便当父进程消失时，它不会在完成后变成僵尸或失效进程？
编辑：我想我找到了两种方法。希望有人能告诉我哪一个更合适？
- 设置 $SIG{CHLD} = 'IGNORE';
- 使用 POSIX 'setsid'；
编辑：生成的进程也将是另一个 perl 脚本。
I have a perl script which i'd like to spawn a process. It can take a while and most times the parent script will exit. How do I spawn this process so that when the parent is gone it wont turn into a zombie or a defunct process when its done?
edit: I think ive found two methods. Hopefully someone could tell me which one is more appropriate?
- setting $SIG{CHLD} = 'IGNORE';
- use POSIX 'setsid';
edit: The spawned process is also going to be another perl script.
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当进程退出并且其父进程通过
wait()获取其状态之前，该进程将变为僵尸进程。当一个进程派生另一个进程然后退出时，子进程将成为 pid 1（经典的“init”）的父进程，后者立即获取进程状态。因此，通常问题与您所描述的相反：子进程变成僵尸（因为父进程不是为处理SIGCHLD并调用wait()而编写的），但是当父级退出僵尸由init继承并立即收获。事实上，将子进程与其父进程完全解耦（“守护进程”）的常用解决方案涉及有意分叉并让中间进程退出，以便守护进程立即成为 init 的子进程。编辑：如果您在 shell 中并且想要实现此效果，请尝试
(subprocess &)。括号创建一个子shell，它在后台执行subprocess，然后立即退出。A process becomes as zombie when it exits and before its parent process picks up its status with
wait(). When one process forks another and then exits, the child becomes a parent of pid 1 (classically "init") which immediately reaps the process state. So usually the problem is the reverse of what you describe: The child becomes a zombie (since the parent was not written to deal withSIGCHLDand callwait()) but when the parent exits the zombie is inherited byinitand immediately reaped. In fact, the usual solution to decouple a child process fully from its parent ("daemonize") involves intentionally forking and having the intermediate process exit so that the daemon is immediately a child ofinit.Edit: If you're in shell and want to achieve this effect, try
(subprocess &). The parenthesis create a subshell which executessubprocessin the background and then immeidately exits.