[minicom-Bugs][314618] SIGALRM is broken on some Linux systems. Workaround patch attached.

[minicom-bugs at alioth.debian.org]

minicom-Bugs item #314618, was opened at 2014-03-01 13:41 by David Dominguez Bonini
You can respond by visiting: 
https://alioth.debian.org/tracker/?func=detail&atid=100031&aid=314618&group_id=30018

Status: Open
Priority: 3
Submitted By: David Dominguez Bonini (ddoming73-guest)
Assigned to: Nobody (None)
Summary: SIGALRM is broken on some Linux systems. Workaround patch attached. 
Category: None
Group: None
Resolution: None


Initial Comment:

This bug has been reproduced on Ubuntu 12.04.4 LTS and minicom 2.7

The problem is that when Minicom and/or runscript are called on such a system, the SIGALRM signal is on an undefined state. It is not actually blocked, but it cannot be used correctly (the signal handler is not called). 

As a result, timeouts do not work on runscript (global and expect timeouts). Some other things that depend on SIGALRM may also be broken.

There is a simple solution. Just call sigrelse(SIGALRM) on program entry and the signal will start working correctly.

More info on the possible cause of this bug here:

http://www.vttoth.com/CMS/technical-notes/14-broken-sigalrm-on-linux

A patch for minicom and runscript is attached. This patch fixes the bug on affected systems and should harmless on all others. Please apply



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You can respond by visiting: 
https://alioth.debian.org/tracker/?func=detail&atid=100031&aid=314618&group_id=30018