Problem on capturing system Shutdown Post: 302847709

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Top Forums Programming Problem on capturing system Shutdown Post 302847709 by hakermania on Tuesday 27th of August 2013 03:10:38 PM

08-27-2013

Registered User

Quote:

Originally Posted by Corona688

I think you just answered your own question. You can give it more than a chance -- you can actually do so. Async-safe calls include open(), close(), read(), and write() among many other things. All you need.

So you claim that if I make a sync-safe function using the above sync-safe functions, then the handler will be executed? And if this is true then how does the system determine:

a) Where in the memory the handler sits for each application
b) If the handler is sync-safe or sync-unsafe

Also, this is still a question:

What different does the system do instead of sending SIGTERM, waiting for the process to exit, and, after timing out, sending SIGKILL? Because it does something different, it not only sends SIGTERM, because if I send it, it just works.

hakermania

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sync

SYNC(1) 							   User Commands							   SYNC(1)

NAME

       sync - Synchronize cached writes to persistent storage

SYNOPSIS

       sync [OPTION] [FILE]...

DESCRIPTION

       Synchronize cached writes to persistent storage

       If one or more files are specified, sync only them, or their containing file systems.

       -d, --data
	      sync only file data, no unneeded metadata

       -f, --file-system
	      sync the file systems that contain the files

       --help display this help and exit

       --version
	      output version information and exit

BUGS

       Persistence guarantees vary per system.	See the system calls below for more details.

AUTHOR

       Written by Jim Meyering and Giuseppe Scrivano.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report sync translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       fdatasync(2), fsync(2), sync(2), syncfs(2)

       Full documentation at: <http://www.gnu.org/software/coreutils/sync>
       or available locally via: info '(coreutils) sync invocation'

GNU coreutils 8.28						   January 2018 							   SYNC(1)