Unix Programming - Re: is it necessary to be a session leader to attach psuedo terminal as a controlling

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Re: is it necessary to be a session leader to attach psuedo terminal as a controlling

Maxim Yegorushkin

2006-07-21, 7:28 am

pankajtakawale wrote:
> To attach controlling terminal (CT) to a process:
> I have following code similar in OpenSSH
>
> 1. disconnect from old CT
> 2. become a session leader setsid()
> 3. attach psuedo tty to process calling ioctl(fd, TIOCSCTTY, NULL)
>
> I dont want my process being a session leader to avoid SIGHUP for child
> process.

Is there a reason why you can't block SIGHUP before spawning a child?
This way children would not receive SIGHUP since the signal mask is
inherited by child processed.

http://www.opengroup.org/onlinepubs...igprocmask.html

P.S. If you are using Solaris 8, it's broken in this regard. The signal
mask on this operating system is only inherited by threads, not child
processes.