Return Codes... Post: 302867345

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Top Forums UNIX for Dummies Questions & Answers Return Codes... Post 302867345 by bakunin on Thursday 24th of October 2013 04:26:20 AM

10-24-2013

Registered User

Quote:

Originally Posted by wisecracker

This was just an idea...

I wasn't actually asking anything. I was experimenting with generating an error code
system of my own with values outside of an 8 bit range.
I used the real 255 exit code as 'number out of range' flag and then generate a string
whilst exit is in process. This string was originally a number, but I decided to make it
a string instead, purely for fun.

I am not sure if this will work in any way: return codes are not coming out of thin air, but the result of a system call, as jim mcNamara has explained. It can't give you back more than it ought to. It is defined as an unsigned 8-bit integer, so it can't deliver a 16- (or 32-, 64-, ...) bit number, a string or whatever. This would mean that this value has to be put on the stack and then pulled off it by the wait() or waitpid()-function. As the function would not know that it is expected to get that off the stack it won't do it and the stack would be (and stay) subsequently corrupted.

If you want to have extended exit-messages of any sort - strings, numbers, whatever - you will have to use the classical means of conveying such messages: interprocess communication (aka semaphores, shared memory segments, ... - take your pick) or process-to-process I/O, like file descriptors and/or named pipes. Write to <stdout>, <stderr>, etc. and intercept this with pipes, I/O-redirection and the like.

Another option is to write to a log file of some sort and have that parsed from the calling process.

Quote:

Originally Posted by wisecracker

Perhaps I shouldn't have posted it...

There is no harm done in discussing anything and i am convinced this board won't go down from 1k characters of non-conclusive discussion. Still, i think you should post such topics (and the likes - you seem to enjoy exploring the limits of the OS in general and the shell in specific) not in the beginner forum. This is clearly not the stuff someone who learned the shell yesterday asks first. Please consider moving to the experts forum for topics like this.

I hope this helps.

bakunin

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locale::codes::langfam

Locale::Codes::LangFam(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangFam(3pm)

NAME

       Locale::Codes::LangFam - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. A code set may be specified using either a name, or a
       constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.18.2							    2013-11-04					       Locale::Codes::LangFam(3pm)

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