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# -*- sh -*-
# vim:ft=sh:ts=8:sw=4:noet
LOCKFILE="/var/run/hibernate-script.pid"
LOCKFILE_IN_USE=
AddSuspendHook 01 LockFileGet
AddResumeHook 01 LockFilePut
# LockFileGet: test if a lockfile already exists, and create one if not. If it
# does exist, returns 1 to indicate the script should abort unless using
# --force. This code has race conditions. We could probably do something
# fancier with symlinks if we cared, but the worst that would happen if the
# race condition was hit, is we suspend twice. Big whoop.
LockFileGet() {
local other_pid
if [ -f "$LOCKFILE" ] ; then
read other_pid < $LOCKFILE
IsANumber $other_pid || other_pid=
if [ -n "$other_pid" ] && kill -0 $other_pid > /dev/null 2>&1 ; then
vecho 0 "$EXE: Another hibernate process is already running ($other_pid)."
vecho 0 "$EXE: If this is stale, please remove $LOCKFILE."
return 1 # abort unless forced
fi
rm -f $LOCKFILE
fi
echo $$ > $LOCKFILE
LOCKFILE_IN_USE=1
return 0
}
# Remove the lockfile if we created one. Again, not foolproof as this may not
# have been our lock file.
LockFilePut() {
[ -n "$LOCKFILE_IN_USE" ] && rm -f $LOCKFILE
return 0
}
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