Date: Thu, 27 Jan 2011 17:38:48 +0000 From: Devin Teske <dteske@vicor.com> To: Aryeh Friedman <aryeh.friedman@gmail.com> Cc: Devin Teske <dteske@vicor.com>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: OT: How to set a timeout for a process Message-ID: <1296149928.20060.31.camel@dt.vicor.com> In-Reply-To: <AANLkTi=NJA4by3Pnv7f=KOh-R%2BSTq_aLiuS9K4FFO0_7@mail.gmail.com> References: <AANLkTi=NJA4by3Pnv7f=KOh-R%2BSTq_aLiuS9K4FFO0_7@mail.gmail.com>
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On Thu, 2011-01-27 at 03:37 -0500, Aryeh Friedman wrote:
> I have a script that may or not hang (the reasons why it hangs are
> unimportant here) and need to call it from an other script and need to
> say if it hangs to give up after X seconds and just continue the
> script (no harm done if it fails)
#!/bin/sh
# -*- tab-width: 4 -*- ;; Emacs
# vi: set tabstop=4 :: Vi/ViM
############################################################ GLOBALS
# Global exit status variables
SUCCESS=0
FAILURE=1
############################################################ FUNCTIONS
# timeout_watcher $nsecs
#
# No need to call directly. Used by eval_timeout in the following
manner:
# eval_timeout $nsecs $cmd ... | timeout_watcher $nsecs
#
timeout_watcher()
{
local timeout="$1" tPID tALIVE
read tPID
while :; do
kill -INFO $tPID 2> /dev/null || break
read -t "$timeout" tALIVE
if [ ! "$tALIVE" ]; then
# The SIGINFO trap didn't respond in the given timeout...
# ... assume the sub-shell has hung and kill it.
kill -9 $tPID
break
fi
sleep $timeout
done
}
# eval_timeout $nsecs $cmd ...
#
eval_timeout()
{
local timeout="$1"
[ "$timeout" ] || return $FAILURE
shift
cat <<-EOF | sh -T | timeout_watcher $timeout
trap 'echo still alive' INFO
echo \$\$
eval "$@" 2>&1
EOF
}
############################################################ MAIN
eval_timeout "$@"
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