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Full Discussion: retrieve process state programatically
Top Forums UNIX for Advanced & Expert Users retrieve process state programatically Post 302388724 by Andre_Merzky on Thursday 21st of January 2010 08:28:15 AM
Old 01-21-2010
Question retrieve process state programatically
Assume I spawn a process on (csh) command line, like

Code:
> du -a / >& /dev/null &

which creates a process with id 1234. Now, I can suspend/resume that process with

Code:
> kill -STOP 1234
> kill -CONT 1234

and can query the process state via 'jobs' or 'ps. How can I though query that state programatically (UNIX/POSIX system, no /proc/ available)?

The only call closest to the problem seems waitpid(), which can use WUNTRACED to get notifications on some signals, including SIGSTOP. That seems to work only for processes spawned within the same application - so I would not be able to write a tool which, for the example above, works like

Code:
> check_proc_state -p 1234
 1234 is Running

Another option is to do something like

Code:
FILE* fd = popen ("ps -ewwo pid=,uid=,state=,command=", "r");

and to grep the output - but ps output is not well standardized (well, it actually is, see ps, but the various implementations do not necessarily adhere to the spec), and also this seems a very cumbersome way to do that. Not to speak of performance...

Any better ideas? The solution ideally should work on MacOS, BSD, Linux, and AIX.

Thanks, Andre.


PS.: yes, I grep'ed the forum: huge amount of related posts, and I may well have missed relevant discussions in the noise. My apologies, and thanks for any pointers...
Last edited by Andre_Merzky; 01-21-2010 at 09:46 AM.. Reason: code tags, please...
 

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LEARN ABOUT MOJAVE

locale::codes::langvar

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

NAME

       Locale::Codes::LangVar - standard codes for language variation identification

SYNOPSIS

	  use Locale::Codes::LangVar;

	  $lvar = code2langvar('acm');		       # $lvar gets 'Mesopotamian Arabic'
	  $code = langvar2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langvar_codes();
	  @names   = all_langvar_names();

DESCRIPTION

       The "Locale::Codes::LangVar" module provides access to standard codes used for identifying language variations, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language variations. 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:

	  $lvar = code2langvar('en','alpha-2');
	  $lvar = code2langvar('en',LOCALE_CODE_ALPHA_2);

       The codesets currently supported are:

       alpha
	   This is the set of alphanumeric codes from the IANA language registry, such as 'arevela' for Eastern Armenian.

	   This code set is identified with the symbol "LOCALE_LANGVAR_ALPHA".

	   This is the default code set.

ROUTINES

       code2langvar ( CODE [,CODESET] )
       langvar2code ( NAME [,CODESET] )
       langvar_code2code ( CODE ,CODESET ,CODESET2 )
       all_langvar_codes ( [CODESET] )
       all_langvar_names ( [CODESET] )
       Locale::Codes::LangVar::rename_langvar  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangVar::add_langvar  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangVar::delete_langvar  ( CODE [,CODESET] )
       Locale::Codes::LangVar::add_langvar_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangVar::delete_langvar_alias  ( NAME )
       Locale::Codes::LangVar::rename_langvar_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangVar::add_langvar_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangVar::delete_langvar_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.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

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							    2014-01-06					       Locale::Codes::LangVar(3pm)
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