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Full Discussion: ksh child process not ignoring SIGTERM
Top Forums Shell Programming and Scripting ksh child process not ignoring SIGTERM Post 302827463 by Don Cragun on Friday 28th of June 2013 07:14:11 PM
Old 06-28-2013
As alister already said, the default signal handling behavior for SIGTERM is to terminate the process. Since you haven't ignored SIGTERM in your current shell and you don't ignore SIGTERM in test_sigterm.sh, test_sigterm.sh should terminate the process and that is exactly what you're describing. If you need test_sigterm.sh to ignore SIGTERM signals, change test_sigterm.sh from:
Code:
  #!/bin/ksh
trap 'echo "removing"' QUIT 
while read line
do
sleep 20
done

to:
Code:
#!/bin/ksh
trap '' TERM
trap 'echo removing' QUIT 
while read line
do
        sleep 20
done

Note that in addition to adding a trap to ignore SIGTERM, I:
  1. moved the #!/bin/ksh to the start of the line (with it where it was, the default shell for your system will be used to run this script instead of the Korn shell),
  2. removed the double quotes around removing (there is no need to quote a single word operand to the echo utility), and
  3. indented the body of the while loop (to make it easier to see the structure of your shell script).
This User Gave Thanks to Don Cragun For This Post:
rpoornar
 

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LEARN ABOUT LINUX

let

let(1)                                                             User Commands                                                            let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

DESCRIPTION

   ksh
       Each arg is a separate "arithmetic expression" to be evaluated.

EXIT STATUS

       The following exit values are returned:

       0        The value of the last expression is non-zero.

       1        The value of the last expression is zero.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), set(1), typeset(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                             let(1)
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