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Date: Mon, 29 May 2006 13:27:00 +0200
From: Ralf Habacker <ralf DOT habacker AT freenet DOT de>
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To: cygwin AT cygwin DOT com
Subject: Re: note about how-to-debug-cygwin.txt
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Christopher Faylor schrieb:
> On Sun, May 28, 2006 at 10:59:35PM +0200, Ralf Habacker wrote:
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>>
>> In the how-to-debug-cygwin.txt there is listed how to run application
>> using strace in gdb:
>>
>> To debug this scenario, do something like this:
>>
>>    bash$ gdb -nw yourapp.exe
>>    (gdb) dll cygwin1
>>    (gdb) l dll_crt0_1
>>    (gdb) b <<first line in the function>>
>>    (gdb) run
>>    (gdb) set strace.active=1
>>    (gdb) continue
>>
>>
>> According to winsup/cygwin/include/sys/strace.h the class member active
>> is known now as _active.
> 
> I've changed this.
> 
>> I have tried to get this running in gdb (cvs), but there is no output in
>> gdb.
> 
> Getting output from gdb was not the intent of this section.  Look at the
> name of the section: "Program dies when running under strace".  If the
> intent was to get output from gdb it would have been something like
> "Make gdb output strace info".

It was not explicit said that there is no output, so I guess it was.

> I'm not aware of any way to have gdb print strace info.

The following patch enables gdb to print cygwin strace messages.

2006-05-29 Ralf Habacker <ralf DOT habacker AT freenet DOT de>

	* win32-nat.c: (handle_output_debug_string): initial strace
	output support for cygwin.


Index: gdb/win32-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/win32-nat.c,v
retrieving revision 1.122
diff -u -b -B -r1.122 win32-nat.c
- --- gdb/win32-nat.c	10 Apr 2006 21:43:45 -0000	1.122
+++ gdb/win32-nat.c	29 May 2006 11:19:49 -0000
@@ -927,7 +927,12 @@
     /* nothing to do */;
   else if (strncmp (s, _CYGWIN_SIGNAL_STRING, sizeof
(_CYGWIN_SIGNAL_STRING) - 1) != 0)
     {
- -      if (strncmp (s, "cYg", 3) != 0)
+      if (strncmp (s, "cYg", 3) == 0)
+        {
+          char *p = strchr(s+12,' '); // skip 'cYgxxxxxxxx <category>'
+          printf_unfiltered ("strace: %s", p ? p+1 : s+12);
+        }
+      else
 	warning (("%s"), s);
     }
 #ifdef __COPY_CONTEXT_SIZE
===================================================================

Regards
 Ralf
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