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Top Forums Programming which signal will flush the file buffer in C/C++ Post 302471063 by Corona688 on Thursday 11th of November 2010 10:50:05 PM
Old 11-11-2010
Quote:
Originally Posted by jackliang
yes, then what is the defaut behavior in detail of threse signals?
Unless otherwise handled? Gracelessly kill the program. A very few signals have special hardwired behavior, like SIGSTOP and SIGCONT, but these trigger behavior that happens outside the program and are uncatchable. And no, before you ask a third time, none of them are for flushing the queues(which happens in userspace anyway).

If you want a special "flush the queues" signal you have to make it yourself. Better yet, fix your application so that it catches SIGTERM properly and quits gracefully instead of having to be killed hard.
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KILL(1)                                                            User Commands                                                           KILL(1)

NAME
kill - send a signal to a process SYNOPSIS
kill [options] <pid> [...] DESCRIPTION
The default signal for kill is TERM. Use -l or -L to list available signals. Particularly useful signals include HUP, INT, KILL, STOP, CONT, and 0. Alternate signals may be specified in three ways: -9, -SIGKILL or -KILL. Negative PID values may be used to choose whole process groups; see the PGID column in ps command output. A PID of -1 is special; it indicates all processes except the kill process itself and init. OPTIONS
<pid> [...] Send signal to every <pid> listed. -<signal> -s <signal> --signal <signal> Specify the signal to be sent. The signal can be specified by using name or number. The behavior of signals is explained in sig- nal(7) manual page. -l, --list [signal] List signal names. This option has optional argument, which will convert signal number to signal name, or other way round. -L, --table List signal names in a nice table. NOTES Your shell (command line interpreter) may have a built-in kill command. You may need to run the command described here as /bin/kill to solve the conflict. EXAMPLES
kill -9 -1 Kill all processes you can kill. kill -l 11 Translate number 11 into a signal name. kill -L List the available signal choices in a nice table. kill 123 543 2341 3453 Send the default signal, SIGTERM, to all those processes. SEE ALSO
kill(2), killall(1), nice(1), pkill(1), renice(1), signal(7), skill(1) STANDARDS
This command meets appropriate standards. The -L flag is Linux-specific. AUTHOR
Albert Cahalan <albert@users.sf.net> wrote kill in 1999 to replace a bsdutils one that was not standards compliant. The util-linux one might also work correctly. REPORTING BUGS
Please send bug reports to <procps@freelists.org> procps-ng October 2011 KILL(1)
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