Problem on capturing system Shutdown Post: 302847687

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Top Forums Programming Problem on capturing system Shutdown Post 302847687 by hakermania on Tuesday 27th of August 2013 02:55:05 PM

08-27-2013

Registered User

I just downloaded the source code of ettercap-graphical (a well know application) and it doesn't use async-safe functions in the code (fprintf is being used, user interface is being normally shut down, the log file is flushed and closed). So how "strict" is it to make async-safe functions?

I also have this simple question: Why not use async-unsafe functions after all? The worse thing that could happen would be the application to crash or to be in a loop easily terminated with SIGKILL. The application was going to forcefully terminate after all. At least give it a chance to do a proper cleanup.

As for simulating shutdown: Now I am simulating shutdown with simply sending SIGTERM to my process. As I said before, this is not the only thing that really happens, because when I send SIGTERM it runs the handler without any problem. So, the system does something else that I am unaware of (I highly doubt that it really spends time on checking whether the function that is to be called is async-safe or not). So, I simply asked whether there is a better way to simulate the shutdown for only one process, because simply sending SIGTERM is not the best way. I don't believe I am being irrational.

hakermania

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LEARN ABOUT MINIX

shutdown

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

NAME

       shutdown - graciously close the system down

SYNOPSIS

       shutdown [-hrRmk] [-x code] [time-specification [message]]

DESCRIPTION

       Shutdown  is a program which allows a system operator to close down the system in an nice way.  Shutdown informs the users why and when the
       system is going down.  This warning is issued 10 minutes before shutdown time and every minute in the last 5 minutes.  At this time (5 min-
       utes), shutdown creates a file /etc/nologin to prevent new users from logging in.

       Shutdown keeps a logfile of shutdowns.  Every shutdown is registered in /usr/adm/wtmp, if this file exists.  After these actions, a call is
       done to reboot(2) which actually brings the system down.

       Time-specification may be something like 15:00, 15.00, +15, or now for a shutdown at 3pm (twice), 15 minutes from now, or immediately.

       The message may be used to describe why the system is going down, it may also be typed on standard input with the -m option.

OPTIONS

       -h     This flag prevents the system from rebooting after the shutdown.	The system can now be powered off.  This is the default.

       -r     This flag indicates that the system should reboot after shutting down.

       -R     Reboot the system by resetting it.  Normally the kernel will try to return to the Boot Monitor.  With -R the system will	receive  a
	      hardware reset.

       -x code
	      Halt  the  system  and  let the Monitor execute the given code as if typed at the monitor prompt.  You can for instance use -x 'boot
	      hd0' as a very fast way to reboot "from the top."

       -m     Allows the operator to type a shutdown message on standard input, that will be added to the messages displayed on all terminals.

       -k     This option gives the possibility of terminating an already started shutdown.  This is only possible if shutdown time  has  not  yet
	      arrived.

       -C     Check  if the system crashed.  This option is not used at shutdown time, but at reboot time.  It tells if the file systems should be
	      checked by testing if the last entry in the wtmp file is a shutdown entry.  (A crude replacement for a file system clean flag.)

FILES

       /usr/adm/wtmp, /etc/nologin, /usr/adm/authlog

SEE ALSO

       reboot(2), wall(1), halt(8), boot(8).

AUTHOR

       Edvard Tuinder (v892231@si.hhs.NL)

																       SHUTDOWN(8)