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Reply-To: moss@cs.umass.edu
Subject: Re: ExitProcess does not work in Cygwin?
To: Jay K <jayk123@hotmail.com>, "cygwin@sourceware.org"
 <cygwin@sourceware.org>
References: <MWHPR1401MB1951896B7184CC9CC408CD07E6539@MWHPR1401MB1951.namprd14.prod.outlook.com>
From: Eliot Moss <moss@cs.umass.edu>
Message-ID: <1f98eb84-e3d7-bf0d-875c-3d4818e41aef@cs.umass.edu>
Date: Thu, 13 Jan 2022 08:40:19 -0500
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On 1/13/2022 1:39 AM, Jay K wrote:
> ExitProcess does not work in Cygwin?
> 
> $ rm *.exe
> 
> # u is for Unix
> # w is for Windows
> 
> $ cat u.c
> #include <stdlib.h>
> int main()
> {
>   exit(1);
> }
> 
> $ gcc u.c
> $ ./a.exe
> 
> $ echo $?
> 1
> 
>   => as expected
> 
> $ cat w.c
> #include <windows.h>
> 
> int main()
> {
>   ExitProcess(1);
> }
> 
> $ gcc w.c
> $ ./a.exe
> 
> $ echo $?
> 0
> 
>   => not expected
> 
> $ uname -a
> CYGWIN_NT-10.0 jayk-tp4 3.3.3(0.341/5/3) 2021-12-03 16:35 x86_64 Cygwin
> 
> works in debugger:
> 
> $ /cygdrive/c/bin/amd64/windbg.exe .\\a.exe
> 
> $ echo $?
> 1
> 
> ?
> 
>   - Jay

ExitProcess does not appear to be a POSIX function.  Cygwin strives to provide a
POSIX-like interface, not a Windows-like one.  However, if ExitProcess is a Windows
function, there is probably a library you can use to obtain it in Cygwin (maybe
the winsup (Windows support) library).

Eliot Moss