OS X是否支持POSIX会话? [英] Does OS X support POSIX sessions?

问题描述

我正在研究一个可以充分利用POSIX会话的项目(如此处)，但现在不确定我是否误解了这个概念和/或OS X是否支持流程会话.

I am working on a project which could make good use of POSIX sessions (as described here) but I'm now uncertain whether I'm misunderstanding the concept and/or whether OS X even supports process sessions.

OS X 10.9有一个setsid(2)系统调用，但是用参数0, 0调用它似乎没有作用.查看ps -e -o pid,pgid,sess的输出显示，所有进程的会话ID为0:

OS X 10.9 has a setsid(2) system call but calling it with arguments 0, 0 seems to do noting. And looking at the output of ps -e -o pid,pgid,sess shows that all processes have a session ID of 0:

  PID  PGID   SESS
     1     1      0
    11    11      0
    12    12      0
    13    13      0
    14    14      0
    15    15      0
    16    16      0
    17    17      0
[...]

OS X是否支持POSIX会话进程，如果不支持，是否存在另一种机制，例如一个外壳程序可以用来向该外壳程序启动的所有进程发送信号?

Does OS X support POSIX sessions for processes and, if not, is there another mechanism in place that e.g. a shell can use to send a signal to all processes started from that shell?

除了查看系统上的活动进程外，我还使用了 ersatz-setsid 命令行工具在新会话中运行流程，但没有成功:

Besides looking at active processes on my system, I used the ersatz-setsid command line tool to run a process in a new session, but without success:

$ ./setsid sleep 1000
$ ps -eo pid,pgid,sess,command
  PID  PGID   SESS COMMAND
[...]
10650 10650      0 sleep 1000
[...]

推荐答案

以我的经验，Mac OSX 确实支持posix会话. getsid()系统调用起作用.但是ps实用程序不能(ps -o sess为所有进程生成0).

In my experience, Mac OSX does support posix sessions. The getsid() system call works. But the ps utility does not (ps -o sess produces 0 for all processes).

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