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From: demer@hc17031.hcsd.ca (David Emery)
Subject: Re: How to query active processes from Ada
Date: 1997/01/06
Message-ID: <c4loa6mz6x.fsf@hc17031.hcsd.ca>#1/1
X-Deja-AN: 208117313
sender: demer@hc17031.hcsd.ca
references: <5aj97p$a9m@news.spar.ca>
organization: HCSD
newsgroups: comp.lang.ada
Date: 1997-01-06T00:00:00+00:00
List-Id: <comp.lang.ada>


The short answer is to send SIGNULL to the process with kill().  

Naturally this is supported by POSIX/Ada:
	
	with POSIX, POSIX_Signals, POSIX_Process_Identification;
	function Process_Exists 
	  (Pid : in Posix_Process_Identification.Process_Id) 
		return Boolean is
        begin
	   POSIX_Signals.Send_Signal
	     (Process => Pid,
	      Sig => POSIX_Signals.Signal_Null);
	   -- returns normally if Process exists.  
	   -- if process does not exist, or is not 'killable' by the
	   -- caller, raises POSIX_Error.
	   return True;
	exception
           when POSIX.POSIX_Error =>
	       return False;
	   when others =>
	        raise;
 	end Process_Exists;
	

				dave
-- 
<.sig is away on vacation>