Signal Handling of CYGWIN under VMware Workstation

Signal Handling of CYGWIN under VMware Workstation

[Thomas Kloeber]

  Folks'es,

i'm using cygwin 1.5.9-1 on Windows NT 4SP6 and W2K, both of which run 
on top of VMware Workstation 4.5.1 (host system is W2K on a Dell 
Precision 340).

i have a problem with a database application server (a port from Unix 
using cygwin): if i shut down the application from a bash/ksh via CTRL+C 
the application receives the signal but, instead of performing its 
shutdown procedure, the process dissappears immediately, leaving my DB 
in an inconsitent state. if i do the same from a DOS cmd, the server 
process shuts down ok.

i see the same behaviour if i shutdown the process via a 'control 
panel', which sends the server process a SIGTERM, in 2 out of 3 cases 
the process stops immediately without performing its proper shutdown.

however, if i run the application incl cygwin on a native system, 
everything works just fine.

so my question is, what is the connection/difference between VMware and 
Cygwin signal handling?

thomas

i have written a little test program which demonstrates the behaviour. 
if i run it in a ksh and hit CRTL+C, the process receives the signal and 
terminates. if i run it in DOS cmd, the process receives the signal, 
does its count down and then terminates:

#include "stdafx.h"
#include "signal.h"
#include <windows.h>
#include <stdio.h>

void goHome(int s)
{
    printf("Received signal %d\n", s);
    for (int i = 10; i > 0; i--) {
        printf("Need %2d more seconds to terminate\r", i);
        Sleep(1000L);
    }
    exit(0);
}

int
main(int argc, char *argv[])
{
    signal(SIGINT, goHome);

    printf("Hit Ctrl+C to terminate me\n");
    while (1) {
        Sleep(1000);
    }

    return 0;
}

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Re: Signal Handling of cygwin under VMware Workstation

[Christopher Faylor]

On Wed, May 26, 2004 at 04:20:59PM +0200, Thomas Kloeber wrote:
>so my question is, what is the connection/difference between VMware and 
>Cygwin signal handling?

None.  I use VMware all of the time in cygwin development.
--
Christopher Faylor			spammer? ->	aaaspam@sourceware.org
Cygwin Co-Project Leader				aaaspam@duffek.com
TimeSys, Inc.

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Re: Signal Handling of cygwin under VMware Workstation

[Thomas Kloeber]

Chris,

Christopher Faylor wrote:

>None.  I use VMware all of the time in cygwin development.
>  
>
looks like you're right. further tests show that it is a question, which 
shell i use:

    * ksh and bash: the test program receives the signal and terminates
    * sh: the test program receives the signal and then performs its
      signal handling procedure

(under Solaris 2.8 the test program on all shells shows the correct 
behaviour.)

if i use kill() to send a SIGINT to my test program running on

    * ksh and bash: it terminates without receiving the signal
    * sh: it doesn't receive the signal at all

any ideas/guesses are appreciated.

thomas

-- 
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and use the web for a good purpose: http://www.thehungersite.com/




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Re: Signal Handling of cygwin under VMware Workstation

[Brian Ford]

On Wed, 26 May 2004, Thomas Kloeber wrote:

> any ideas/guesses are appreciated.

The first one that comes to mind is upgrade to 1.5.10-3 ;-).

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...

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