Re: killed by signal

[Atom Smasher <atom@smasher.org>]

On Mon, 6 Apr 2009, Peter Stephenson wrote:

> $jobstates (from zsh/parameter) tells you.  If that's not the answer 
> you'll have to give more details about what you're actually trying to do 
> (which is often the way to get the most useful results).
===============

i can use the return status to figure out if a command was "terminated" by 
a signal, and which signal was the killer... 128+9 = 137 == KILL. i know 
the command immediately preceding the precmd was KILLed.

but if a command is suspended (TSTP; 20 on linux, 18 on freebsd) precmd 
will see a return status <128, which could be a "legal" value for a 
command to return indicating a particular failure. i'd like precmd to 
distinguish between a command that returns 18 or 20 (freebsd or linux, 
respectively), and a command that is suspended with ^Z.

specific example... on freebsd i can get a return status of 18 either by 
suspending a job with ^Z, or running:
 	zip -MM foo.zip no-such-file
  so the question is: how can the shell (can the shell?) tell that one of 
those was suspended with a signal (^Z, TSTP), and zip which is indicating 
a specific failure (zip: "File not found").

for a few seconds i thought the ERRNO might be useful, but it seems to not 
be.

thanks...


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