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Non-interactive shell leaves children running when signaled by TERM

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Old 09-09-2009
Non-interactive shell leaves children running when signaled by TERM
Hello.

When I run

Code:
sh -c 'yes'

and then send SIGTERM to sh's pid, both sh and yes dies.

When I run

Code:
sh -c 'yes | sed "s/y/n/"'

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 MOJAVE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)