Non-interactive shell leaves children running when signaled by TERM
Hello.
When I run
and then send SIGTERM to sh's pid, both sh and yes dies.
When I run
and then send SIGTERM to sh's pid, sh dies but yes and sed remain running in background with init as the parent.
Why?
I bash man page is stated that when bash is interactive and it receives SIGHUP, it sends SIGHUP to all its child processes.
Is it possible to achieve something similar when shell is non-interactive (ie. kill all child processes upon delivery of signal before exit)?
Thank you.
---------- Post updated at 10:05 PM ---------- Previous update was at 08:35 PM ----------
So I've got answer for the first question. It's because in first case shell just call exec, so the signal is delivered to yes. But in the second case, sh do 2 x fork and 2 x exec and waits for the child processes.
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LEARN ABOUT X11R4
kill
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)