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Top Forums Programming Problem on capturing system Shutdown Post 302847643 by hakermania on Tuesday 27th of August 2013 01:51:25 PM
Old 08-27-2013
Thanks a lot for your answer. I cannot understand anything from the phrase
"POSIX.1-2004 (also known as POSIX.1-2001 Technical Corrigendum 2) requires an implementation to guarantee that the following functions can be safely called inside a signal handler:
...
list of functions
...
"
POSIZ.1-2004 requires an implementation? What does that mean? After I implement POSIX.1-2004 then I can safely call only the following functions that almost none of them have to do with writing to files?

Also, is there any way to exactly simulate shutdown for my process only so as not to shutdown my system all the time for testing purposes?

EDIT: Also, how come and the signal handler works each time if I send the SIGTERM? What different does the system do? I thought it sends SIGTERM through kill and waits a small timeout for the processes to end.

Last edited by hakermania; 08-27-2013 at 03:03 PM..
 

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killall(8)						      System Manager's Manual							killall(8)

NAME
killall - Terminates all processes started by the user, except the calling process SYNOPSIS
/usr/sbin/killall [- | [-]signal_name | -signal_number] /usr/sbin/killall -l FLAGS
The hyphen character (without an argument) sends a SIGTERM signal initially and then sends a SIGKILL signal to all processes that survive for 30 seconds after receipt of the first signal. This gives processes that catch the SIGTERM signal an opportunity to clean up. A signal name, optionally preceded by a hyphen, sends the specified signal to processes. The hyphen character (with a signal number argument) sends the specified signal, either a name, stripped of the SIG prefix (such as KILL), or a number (such as 9). For information about signal names and numbers, see the signal() system call. In the System V habitat, the optional signal number does not have to be preceded with a hyphen (-). Lists signal names in numerical order (as given in the /usr/include/signal.h file), stripped of the common SIG prefix. DESCRIPTION
This command provides a convenient means of killing all processes created by the shell that you control. When started by the superuser, the killall command kills all processes that can be terminated, except those processes that started it, the kernel processes, and processes 0 and 1 (init). Security Configuration This command is modified in all security configurations of the system. EXAMPLES
To stop all background processes that have started, enter: killall This sends all background processes signal 9 (the kill signal, also called SIGKILL). To stop all background processes, giving them a chance to clean up, enter: killall - This sends signal 15 (SIGTERM), waits 30 seconds, and then sends signal 9 (SIGKILL). To send a specific signal to the background processes, enter: killall -2 This sends signal 2 (SIGINT) to the background processes. To list the signal names in numerical order, stripped of the SIG prefix, enter: killall -l This displays a list of signals, which may vary from system to system. FILES
Specifies the command path RELATED INFORMATION
Calls: kill(2), sigaction(2), signal(2) delim off killall(8)
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