Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot

Re^11: How to find perl line after segfault.

by BrowserUk (Patriarch)
on Feb 15, 2015 at 21:05 UTC ( #1116816=note: print w/replies, xml ) Need Help??

in reply to Re^10: How to find perl line after segfault.
in thread How to find perl line after segfault.

Well, with open3(), I can use waitpid and then read (error); which allows me some control over what happens next, if I just did system ("perl -d:CallTrace"); Wouldn't it just crash?

It will crash either way, the only differences is that with Re: Catching errors (II)., you can get the error code (and, on *nix at least, the 'signal value'); and then read the output from stderr.

If you use my suggested system q[perl -d:CallTrace 2>trace.txt];, then you can also read back the stderr output, by reading the file.

You're also more likely to get the last few lines, because you won't have the double-buffering effect you get when you use pipes.

Also, if the exit code is important to you, then (from perldoc perlfunc system ):

If you'd like to manually inspect system's failure, you can check all +possible failure modes by inspecting $? like this: if ($? == -1) { print "failed to execute: $!\n"; } elsif ($? & 127) { printf "child died with signal %d, %s coredump\n", ($? & 127), ($? & 128) ? 'with' : 'without'; } else { printf "child exited with value %d\n", $? >> 8; }

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority". I'm with torvalds on this
In the absence of evidence, opinion is indistinguishable from prejudice. Agile (and TDD) debunked

Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://1116816]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others avoiding work at the Monastery: (3)
As of 2023-03-31 07:13 GMT
Find Nodes?
    Voting Booth?
    Which type of climate do you prefer to live in?

    Results (75 votes). Check out past polls.