From: Martin Hansen on
Hello,


I would like to, for a given script, to print the exit status - such as
normal, interrupted, terminated, etc. to a log file. How can I do that?



Martin
--
Posted via http://www.ruby-forum.com/.

From: Robert Klemme on
2010/6/18 Martin Hansen <mail(a)maasha.dk>:
> I would like to, for a given script, to print the exit status - such as
> normal, interrupted, terminated, etc. to a log file. How can I do that?

Not clear what you intend to do. Is the script a Ruby script? Then
you do it with any process. Do you want to print the status of
another program in a Ruby script? Where do you want to print that?

Cheers

robert


--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

From: Martin Hansen on
I would like to print the exit status from within the current Ruby
script to a log file. I have been messing a bit with $?, but that way I
get "pid 8144 exit 0" in the log file and "Interrupted" goes to terminal
- I wanted "Interrupted" in the log file. I have not been able to make
trap() do the trick, and with trap I loose the default exit and stack
trace output (I think trap is to be avoided).

The log file is just a file dedicated to this script.


Cheers,


Martin


Robert Klemme wrote:
> 2010/6/18 Martin Hansen <mail(a)maasha.dk>:
>> I would like to, for a given script, to print the exit status - such as
>> normal, interrupted, terminated, etc. to a log file. How can I do that?
>
> Not clear what you intend to do. Is the script a Ruby script? Then
> you do it with any process. Do you want to print the status of
> another program in a Ruby script? Where do you want to print that?
>
> Cheers
>
> robert

--
Posted via http://www.ruby-forum.com/.

From: Robert Klemme on
Please don't top post.

2010/6/21 Martin Hansen <mail(a)maasha.dk>:
> I would like to print the exit status from within the current Ruby
> script to a log file. I have been messing a bit with $?, but that way I
> get "pid 8144 exit 0" in the log file and "Interrupted" goes to terminal
> - I wanted "Interrupted" in the log file.

"Interrupted" is not an exit status. This is most likely written by
the other process that you started. You either need to catch the
other process's output (most likely stderr) or invent a mechanism to
report the interruption via the exit status (this works only if you
have control over the other process's code). Then you can interpret
the exit status to write your log message.

irb(main):008:0> system "true"
=> true
irb(main):009:0> $?
=> #<Process::Status: pid 712 exit 0>
irb(main):010:0> $?.exitstatus
=> 0

If you want to catch the output you can use one of the popen methods, e.g.

irb(main):001:0> require 'open3'
=> true
irb(main):002:0> Open3.popen3 "ls", "nonexistent" do |si,so,serr,th|
irb(main):003:1* p serr.read
irb(main):004:1> st = th.value
irb(main):005:1> p st, st.exitstatus
irb(main):006:1> end
"ls: cannot access nonexistent: No such file or directory\n"
#<Process::Status: pid 3160 exit 2>
2
=> [#<Process::Status: pid 3160 exit 2>, 2]

> I have not been able to make
> trap() do the trick, and with trap I loose the default exit and stack
> trace output (I think trap is to be avoided).

trap in your Ruby script will trap signals for this process not the
forked process - unless you use the block form of fork in which case I
believe the child inherits all signal handlers.

Kind regards

robert

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

From: Martin Hansen on
Hm, I am not making myself clear :o( - It is the status of the ruby
script at hand I want to log. $? is probably barking up the wrong tree
and adding confusion. In Perl I would do this trapping the signal.

> trap in your Ruby script will trap signals for this process not the
> forked process - unless you use the block form of fork in which case I
> believe the child inherits all signal handlers.

#!/usr/bin/env ruby

signal = nil

trap("INT") { signal = "interupted"; exit }
#trap("TERM") { signal = "terminated"; exit }

at_exit { puts "Put this in logfile: #{signal}" }

sleep 5

I have two issues with this: I loose the stack trace that is normally
printed to stderr (I still want that printed to stderr):

/test.rb:10:in `sleep': Interrupt
from ./test.rb:10:in `<main>'


And I fail setting signal as a global variable (if that can be done?) so
I can use it from within a class without getting errors like this:

in `block in <class:Biopieces>': undefined local variable or method
`signal' for Biopieces:Class (NameError)



Cheers,


Martin
--
Posted via http://www.ruby-forum.com/.

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