| #!/bin/sh | |
| FILE=$1 | |
| if [ -z "$FILE" ]; then | |
| echo "usage: $0 <filename>" >&2 | |
| exit 1 | |
| fi | |
| printf 'START ' >$FILE | |
| # log SIGTERM and exit | |
| trap "printf 'TERM ' >>$FILE; exit 0" TERM | |
| # log SIGHUP but *don't* exit | |
| trap "printf 'HUP ' >>$FILE" HUP | |
| while sleep 0.1; do | |
| echo "PPID=$PPID" | |
| [ "$PPID" -gt 1 ] && kill -0 "$PPID" || exit 2 | |
| done |