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Re: Why does 'connect' take so long (sometimes) and can't be interrupted


From: tetsujin
Subject: Re: Why does 'connect' take so long (sometimes) and can't be interrupted?
Date: Thu, 15 Jun 2017 14:25:17 -0400

I can't think of what could cause this problem. The TCP connection
code in Bash seems pretty straightforward, and in my experiments I was
able to interrupt it even if it was waiting for the server to accept a
connection, or waiting for an available slot in the listen queue. It's
possible the problem is in your C code. Would you be able to post a
version of it that exhibits the problem?

----- Original Message -----
From: address@hidden
To:<address@hidden>
Cc:
Sent:Thu, 15 Jun 2017 09:36:12 -0600
Subject:Why does 'connect' take so long (sometimes) and can't be
interrupted?

Description:
 This is a little complicated and I can't give you full details on how
to
 replicate it, since I don't fully understand it myself. But under
certain
 circumstances, the following line takes a very long time to execute:

 exec 5<>/dev/tcp/localhost/12345

 My objections are twofold:
 a) That it takes so long - it should either succeed or file (almost)
 immediately.
 b) When it is running, it is uninterruptable. None of ^C, ^, or ^Z,
nor
 any signal sent to the bash process (other than SIGKILL) will cause
 it to exit. Effectively, the only escape is to SIGKILL the bash
 process, which causes the entire shell to be killed.




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