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Date: Mon, 27 Jul 2015 12:54:09 +0200
Subject: Re: [ANNOUNCEMENT] Update: mintty 2.1.2
From: "Houder" <houder AT xs4all DOT nl>
To: cygwin AT cygwin DOT com, "Thomas Wolff" <towo AT towo DOT net>
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> Hi Thomas,
>
> Let me rephrase/summarize my findings:
>
> Executing 'mintty -D' (i.e. v212)
>
>     from a shortcut to bash (i.e. Cygwin console),
>
> will fork itself, where the child will turn itself into a session leader, as
> desired.
>
> i.e. the following code will be executed:
>
> #if 1 // Thomas
>  if (daemonize && !isatty(0)) { // daemonize == true, !isatty(0) == true
>    if (fork() > 0) exit(0);
>    setsid(); // executed by child
>  }
> #endif
>
> 1. if 'Windows Basic' has been selected (Personalization), the child will crash.
>
> 2. if 'Windows 7' has been selected (Personalization), the child will NOT crash,
>    ... and, eventually, fork itself, where the "grandchild" will replace itself
>    by bash in the end.

Hi Thomas,

I _may_ have found the cause of the problem ... (but all bets are off!).

main() in winmain.c starts as follows:

int
main(int argc, char *argv[])
{
  main_argv = argv;
  main_argc = argc;
// Henri: too early?
#if 0
  load_dwm_funcs();
#endif

load_dwm_funcs() apparently "loads" a library, as follows:

load_dwm_funcs
  load_sys_library("dwmapi.dll")
    LoadLibrary ...

Will the library still be loaded in the child, I asked myself ...

As an experiment, I moved the call to load_dwm_funcs() after fork/setsid.

... fork()
... setsid()

// child continues ...

// Henri: will dwmapi.dll still be loaded after the fork() call ?????
#if 1
load_dwm_funcs();
#endif

Still more testing is needed ... but I _may_ have found why mintty -D crashes. But
I cannot explain why the crash does not occur when "eye candy" has been enabled.

Henri


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