* dcrt0.cc (dll_crt0_1): Delay closing of some handles until cygheap has been

set up.
(break_here): New function, for debugging.
(initial_env): Add program name to "Sleeping" message.  Implement new
"CYGWIN_DEBUG" environment variable option.
* exceptions.cc (debugger_command): Add argument to dumper call.
* strace.cc (strace::hello): Use winpid if cygwin pid is unavailable.
(strace::vsprntf): Ditto.

winsup/cygwin/how-to-debug-cygwin.txt

@@ -71,6 +71,19 @@ c:\some\path\bad_program.exe some parameters
    After that you can normally step through the code in cygwin1.dll and
    bad_program.exe
 
+   You can also set a CYGWIN_DEBUG variable to force the debugger to pop up
+   only when a certain program is run:
+
+set CYGWIN_DEBUG=cat.exe=gdb.exe
+
+   This will force gdb.exe to start when the program name contains the string
+   "cat.exe".  The '=gdb.exe' isn't really needed, since it is the default.
+   It is just there to show how you can specify a program to run when the
+   program starts.
+
+   Note that it bears repeating that both of the above options are *only*
+   available when configuring cygwin with --enable-debugging.
+
 6. Heap corruption.
    If your program crashes at malloc() or free() or when it references some
    malloc()'ed memory, it looks like heap corruption. You can configure and