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From: "lhall AT pop DOT ma DOT ultranet DOT com" <lhall AT pop DOT ma DOT ultranet DOT com>
To: oreste DOT bernardi AT st DOT com, cygwin AT cygwin DOT com
Subject: RE: SIGSEGV when called sem_init() with gdb.
Date: Tue, 10 Dec 2002 11:03:41 -0500
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Rerun setup and update your gdb.  If that doesn't help, 
let the list know.

Larry

Original Message:
-----------------
From: Oreste Bernardi oreste DOT bernardi AT st DOT com
Date: Tue, 10 Dec 2002 16:01:16 +0100
To: cygwin AT cygwin DOT com
Subject: SIGSEGV when called sem_init() with gdb.


Dear, all

#include <semaphore.h>
int main () {
int p;
sem_t sem;
int i=0,d;
//sem=(sem_t)NULL; //With this There isn't any problem
sem_init (&sem,0,1);
sem_post (&sem);
sem_wait(&sem);
return i;
}

cygwin 1.3.17-1
gcc  3.2-3
gdb  20010428-3

When executing this source code with gdb I get an SIGSEGV signal  when
sem_init() function is called.
If I continue on, program works fine.
If program is not executed from gdb, it works without any error.
If I initialize it with NULL, I don't get any error.

I think that is the same behavior as described by following mail:
http://sources.redhat.com/ml/cygwin/2002-10/msg00956.html
Is this true ?

To avoid annoying gdb error message, is my solution ("sem=(sem_t)NULL")
reliable and portable ?

Best Regards
Oreste Bernardi


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