sigchld.sh revision 7c2fbfb345896881c631598ee3852ce9ce33fb07
########################################################################
# #
# This software is part of the ast package #
# Copyright (c) 1982-2008 AT&T Intellectual Property #
# and is licensed under the #
# Common Public License, Version 1.0 #
# by AT&T Intellectual Property #
# #
# A copy of the License is available at #
# http://www.opensource.org/licenses/cpl1.0.txt #
# (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) #
# #
# Information and Software Systems Research #
# AT&T Research #
# Florham Park NJ #
# #
# David Korn <dgk@research.att.com> #
# #
########################################################################
function err_exit
{
print -u2 -n "\t"
print -u2 -r ${Command}[$1]: "${@:2}"
(( Errors+=1 ))
}
alias err_exit='err_exit $LINENO'
float DELAY=${1:-0.5}
integer FOREGROUND=10 BACKGROUND=2 Errors=0
s=$($SHELL -c '
integer i foreground=0 background=0
float delay='$DELAY' d=0 s=0
set --errexit
trap "(( background++ ))" CHLD
(( d = delay ))
for ((i = 0; i < '$BACKGROUND'; i++))
do sleep $d &
(( d *= 4 ))
(( s += d ))
done
for ((i = 0; i < '$FOREGROUND'; i++))
do (( foreground++ ))
sleep $delay
(( s -= delay ))
$SHELL -c : > /dev/null # foreground does not generate SIGCHLD
done
if (( (s += delay) < 1 ))
then (( s = 1 ))
fi
sleep $s
wait
print foreground=$foreground background=$background
') || err_exit "test loop failed"
eval $s
(( foreground == FOREGROUND )) || err_exit "expected $FOREGROUND foreground -- got $foreground (DELAY=$DELAY)"
(( background == BACKGROUND )) || err_exit "expected $BACKGROUND background -- got $background (DELAY=$DELAY)"
exit $((Errors))