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Message-ID: <422F0DD7.1050904@zevelx.net>
Date: Wed, 09 Mar 2005 09:53:11 -0500
From: zevel <zg DOT cyg AT zevelx DOT net>
User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206)
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To: Cygwin List <cygwin AT cygwin DOT com>
Subject: Re: cygwin1.dll exit status
References: <422C6575 DOT 2010006 AT zevelx DOT net> <6 DOT 2 DOT 0 DOT 14 DOT 0 DOT 20050307114035 DOT 034a9a18 AT pop DOT prospeed DOT net>
In-Reply-To: <6.2.0.14.0.20050307114035.034a9a18@pop.prospeed.net>
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> At 09:30 AM 3/7/2005, you wrote:
> 
>>The latest version of cygwin1.dll ("cygwin1.dll" v0.0 ts=2005/3/1 11:01) does not return the correct exit status when a Cygwin application is called from Windows. Older versions such as ("cygwin1.dll" v0.0 ts=2004/11/10 8:34) do.
>>
>>
>>Example:
>>
>>Create the bash script - error4.sh
>>-------------------------------------------------
>>#
>># simple script to return the exit status of 4
>>#
>>exit 4
>>-------------------------------------------------
>>
>>The from the Windows command prompt run the following:
>>
>>C:\TMP> bash error4.sh
>>C:\TMP> echo %errorlevel%
>>
>>For an older cygwin1.dll the output is:
>>4
>>
>>For the newest cygwin1.dll the output is:
>>1024
> 
> 
> 
> See <http://sources.redhat.com/ml/cygwin/2005-01/msg01382.html>.  Also 
> look at the similar thread about this same issue last week:
> <http://sourceware.org/ml/cygwin/2005-03/msg00088.html>.  This is all
> as-designed/as-intended.
> 
> 
> 
> --
> Larry Hall                              http://www.rfk.com
> RFK Partners, Inc.                      (508) 893-9779 - RFK Office
> 838 Washington Street                   (508) 893-9889 - FAX
> Holliston, MA 01746                     
> 
> 

Thank you that was exactly the problem. To "fix it" for returning an 
expected status to a Windows program I wrote a wrapper utility which 
calls a CYGWIN program and fixes the exit status. This program works 
with old and new CYGWIN and Non-CYGWIN programs.

Two very big caveats:

1) build this utility with non-CYGWIN tools such as Visual C++, Borland 
or MinGW so its exit status is not broken.

2) the path of the executable must not contain any spaces.

I hope this utility helps others.

-Zevel

------------------------ File: FixStatus.cpp -------------------------
//
// Utility to fix exit status from CYGWIN programs.
//
// If status passed on command line is greater than 255,
// then use high byte as status
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char** argv)
{
	bool bVerbose = false;
	int nStatus = 0;
	int ac = 1;
	char szCommand[4096] = {0};
	int nIndex;

	while(ac < argc)
	{
		char* av = argv[ac++];

		if(*av == '-')
		{	// option
			switch(av[1])
			{
			default:
				printf("Invalid option: %s\n", av);
				/*FALLTHROUGH*/
			case '?':
			case 'h':
				printf("Usage: FixStatus [-h] command [arguments]\n");
				exit(0);
			}
		}
		else
		{	// first argument is executable - copy to command buffer
			nIndex = sprintf(szCommand, av);
			break;
		}
	}

	while(ac < argc)
	{	// build up command line by quoting other arguments
		nIndex += sprintf(szCommand + nIndex, " \"%s\"", argv[ac++]);

	}

	nStatus = system(szCommand);
	if(nStatus >= 256)
	{	// need to fix status from new CYGWIN
		nStatus >>= 8;
	}
	nStatus &= 0x00ff;
	exit(nStatus);
	return(0);	// to quiet compiler
}


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