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|
#!/bin/sh
#
# Copyright (c) 2018-2019 Aaron LI <aly@aaronly.me>
# MIT License
#
# Wait for all/any process(s) to finish ...
#
# Credit: http://blog.joncairns.com/2013/03/wait-for-a-unix-process-to-finish/
#
me="${0##*/}"
has_proc() {
ps -p $1 >/dev/null 2>&1
}
get_proc_cmd() {
if has_proc $1; then
ps -p $1 -o args=
else
echo "(not found)"
return 1
fi
}
usage() {
cat <<_EOF_
Wait for all/any process(s) to finish ...
usage:
${me} [-1] [-i interval] <pid1> [<pid2> ...]
options:
-1 : (number 1) done if any of the given processes finishes.
(default: wait until all processes finish)
-i : number of seconds between every check.
(default: 5)
example:
${me} 123 456 && command ...
_EOF_
exit 1
}
mode="all"
interval=5
while getopts :1hi: opt; do
case ${opt} in
1)
mode="any"
;;
h)
usage
;;
i)
interval="${OPTARG}"
;;
\?)
echo "${me}: invalid option -${OPTARG}"
usage
;;
:)
echo "${me}: option -${OPTARG} requires an argument"
usage
;;
esac
done
shift $((${OPTIND} - 1))
[ $# -eq 0 ] && usage
echo "${me}: waiting for *${mode}* of following process(s) to finish ..."
pids="$@"
nwait=0
for p in ${pids}; do
cmd=$(get_proc_cmd ${p})
ret=$?
echo "* [pid: ${p}] ${cmd}"
if [ ${ret} -eq 0 ]; then
nwait=$((${nwait} + 1))
eval _has_${p}=yes
fi
done
echo -n "${me}: "
while [ ${nwait} -ne 0 ]; do
nwait=0
for p in ${pids}; do
key="_has_${p}"
eval last=\$${key}
if has_proc ${p}; then
nwait=$((${nwait} + 1))
eval ${key}=yes
elif [ -n "${last}" ]; then
echo
echo "${me}: pid=${p} has finished."
[ "${mode}" = "any" ] && exit 0
echo -n "${me}: "
eval ${key}=
fi
done
echo -n "${nwait}."
sleep ${interval}
done
echo "done"
exit 0
|
