07-19-2002
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 X11R4
gnome-session-save
gnome-session-save(1) User Commands gnome-session-save(1)
NAME
gnome-session-save - saves or terminates the current GNOME session
SYNOPSIS
gnome-session-save [--kill] [--gui] [gnome-std-options]
DESCRIPTION
gnome-session-save can be used from a GNOME session to save a snapshot of the currently running applications. This session will be restored
at your next GNOME startup session.
OPTIONS
The following options are supported:
--gui Shows a dialog when the session is saved, and reports errors in dialog boxes instead of printing to stderr.
--kill Terminates the GNOME session.
gnome-std-optionStandard options available for use with most GNOME applications. See gnome-std-options(5) for more information.
EXAMPLES
Example 1: Saving the user's current session
example% gnome-session-save
Example 2: Terminating the user's current session
example% gnome-session-save --kill
Example 3: Using the GUI to terminate the user's current session
example% gnome-session-save --kill --gui
EXIT STATUS
The following exit values are returned:
0 Application exited successfully
>0 Application exited with failure
FILES
The following files are used by this application:
/usr/bin/gnome-session-sThe command-line executable for the application.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWgnome-session |
+-----------------------------+-----------------------------+
|Interface stability |External |
+-----------------------------+-----------------------------+
SEE ALSO
gnome-std-options(5), default.session(5), gnome-smproxy(1), gnome-session(1)
NOTES
Written by Brian Cameron, Sun Microsystems Inc., 2003.
SunOS 5.10 13 Jan 2003 gnome-session-save(1)