Conference turris::digital_unix

9535.0. "Signal handling with ksh" by NNTPD::"[email protected]" (Joe Watzko) Thu Apr 17 1997 08:22

Hi,
	a customer complains that Digital UNIX ksh behaves
	different than SunOS/Solaris.

	Specific to a STOP Signal to a parent process.
	Here is a example to reproduce:

------------------------
# more *.sh
::::::::::::::
s1.sh
::::::::::::::
#!/bin/sh
echo "\nScript1 started"
sh -x ./s2.sh
echo "Script1 ended\n"

::::::::::::::
s2.sh
::::::::::::::
#!/bin/sh
echo "\tScript2 started"
# Activate CONT process
sh -x ./s3.sh &
sleep 5
# Activate STOP process
sh -x ./s4.sh
echo "\tScript2 ended"

::::::::::::::
s3.sh
::::::::::::::
#!/bin/sh
echo "\t\tRelease process waiting"
sleep 15
echo "\t\t\tActivated release process"
/usr/bin/kill -CONT `ps -o ppid="" -p $$`

::::::::::::::
s4.sh
::::::::::::::
#!/bin/sh
echo "\t\t\tActivate STOP process"
# Stop Parent Process
/usr/bin/kill -STOP `ps -o ppid="" -p $$`

#
# s1.sh

Script1 started
+ echo \tScript2 started
        Script2 started
+ sleep 5
+ sh -x ./s3.sh
+ echo \t\tRelease process waiting
                Release process waiting
+ sleep 15
+ sh -x ./s4.sh
+ echo \t\t\tActivate STOP process
                        Activate STOP process
+ ps -o ppid= -p 19944
+ /usr/bin/kill -STOP 19957
+ echo \t\t\tActivated release process
                        Activated release process
+ ps -o ppid= -p 19965
+ /usr/bin/kill -CONT 19957
+ echo \tScript2 ended
        Script2 ended
Script1 ended

#
# setenv BIN_SH xpg4

#s1.sh

Script1 started
+ echo \tScript2 started
        Script2 started
+ sh -x ./s3.sh
+ sleep 5
+ echo \t\tRelease process waiting
                Release process waiting
+ sleep 15
+ sh -x ./s4.sh
+ echo \t\t\tActivate STOP process
                        Activate STOP process
+ ps -o ppid= -p 19966
+ /usr/bin/kill -STOP 19949
Script1 ended

---------------------------

	So with sh it looks OK, and with ksh all script processes are
	killed.

	Which of the ksh's (DEC / SUN) hehaves correctly.

	Tested with Digital UNIX V3.2D, V4.0A

Regards Joe






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