do you believe X-application will "kill" the CDE and come back to login dialog Post: 24874

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Top Forums Programming do you believe X-application will "kill" the CDE and come back to login dialog Post 24874 by chenhao_no1 on Friday 19th of July 2002 03:20:09 AM

07-19-2002

Registered User

1 . thanks Perderabo
2 . I do a experiment in Compaq Tru64 Unix.
It (X-applicaton ) "kill" the CDE sometimes .
When the X-Application "kill" the CDE and let me come back to login dialog , it catch all signal SIGHUP (I use sigacton() (its sa_flags = SA_SIGINFO) ). signal SIGHUP , which sent by pid = 0 ,uid = 0 ( in fact it is [kernel idle] )
I add the tcgetsid(STDIN_FILENO) in source code , I find that When I launch the X-applicaion the "session leader" is 2345 (it will change ) , and When I launch the X-application from a menu button , its "session leader" is -1.

I can not understand why the kernel send the SIGHUP . Because :

3. "the signal is sent to the controlling process(session leader) associated with a controlling terminal if a disconnect is detected bye the terminal inferface" . But When I type the command "ps aux ",I found that the TTY of the X-applicaton is ??? , which indicate that it do not have a controlling terminal device (maybe I am wrong) . Since the X-applicaton does not have a controlling terminal , Why does the kernel sent SIGHUP to it

4 "the signal is also generated if the session leader terminato" . But I use tcgetsid(STDIN_FILENO), I find that the session leader is -1 . Since the session leader is dead (because it is -1) , how can it receive SIGHUP . (sometimes when the session leader is -1 ,the X-applicaton work correctly)

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LEARN ABOUT DEBIAN

do_dialog

do_dialog(3alleg4)						  Allegro manual						do_dialog(3alleg4)

NAME

       do_dialog - Basic dialog manager function. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       int do_dialog(DIALOG *dialog, int focus_obj);

DESCRIPTION

       The basic dialog manager function. This displays a dialog (an array of dialog objects, terminated by one with a NULL dialog procedure), and
       sets the input focus to the focus_obj (-1 if you don't want anything to have the focus). It interprets user input and  dispatches  messages
       as  they  are  required, until one of the dialog procedures tells it to close the dialog, at which point it returns the index of the object
       that caused it to exit, or until ESC is pressed, at which point it returns -1.

SEE ALSO

       popup_dialog(3alleg4),  init_dialog(3alleg4),   centre_dialog(3alleg4),	 set_dialog_color(3alleg4),   find_dialog_focus(3alleg4),   excus-
       tom(3alleg4), exgui(3alleg4), exrgbhsv(3alleg4)

Allegro 							   version 4.4.2						do_dialog(3alleg4)