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Top Forums Shell Programming and Scripting Strange SIGINT propagation between Parent/Child sh scripts Post 302362132 by danie.ludick on Thursday 15th of October 2009 04:38:19 AM
Old 10-15-2009
Thank you for you quick reply, your advice worked.

I understand what you mean about the children of the children (i.e. the sleep processes) not getting the signal. I tried the following:

Changed "child1" to:
Code:
#!/bin/sh

echo starting proc 1, pid=$$
sleep 600 &
pid1=$!
trap "kill $pid1" exit INT
wait

and then "child2" to:
Code:
#!/bin/sh

echo starting proc 2, pid=$$
sleep 600 &
pid1=$!
trap "kill $pid1" exit INT
wait

so that the INT signals gets propagated to the spawned "sleep" children of each. When I now send a SIGINT to the original parent script, I see that the sleep processes are killed active. I think this solves the problem.
 

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sleep(1)							   User Commands							  sleep(1)

NAME
sleep - suspend execution for an interval SYNOPSIS
sleep time DESCRIPTION
The sleep utility will suspend execution for at least the integral number of seconds specified by the time operand. OPERANDS
The following operands are supported: time A non-negative decimal integer specifying the number of seconds for which to suspend execution. EXAMPLES
Example 1: Suspending command execution for a time To execute a command after a certain amount of time: example% (sleep 105; command)& Example 2: Executing a command every so often example% while true do command sleep 37 done ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of sleep: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 The execution was successfully suspended for at least time seconds, or a SIGALRM signal was received (see NOTES). >0 An error has occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
wait(1), alarm(2), sleep(3C), wait(3UCB), attributes(5), environ(5), standards(5) NOTES
If the sleep utility receives a SIGALRM signal, one of the following actions will be taken: o Terminate normally with a zero exit status. o Effectively ignore the signal. The sleep utility will take the standard action for all other signals. SunOS 5.10 1 Feb 1995 sleep(1)
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