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|
#!/bin/sh
# vim:noexpandtab
# Common functionality for the hooks.
# for great debugging!
[ "${PM_DEBUG}" = "true" ] && set -x
# try to take the lock. Fail if we cannot get it.
try_lock()
{
# $1 = file to use as lockfile
# $2 (optional) content to write to the lockfile,
# extra newline will be appended
# make sure the directory where the lockfile should be exists
mkdir -p "${LOCKDIR}"
local lock="${LOCKDIR}/${1##*/}"
# we use noclobber to make sure there are no race conditions
(set -o noclobber; echo "${2}" > "${lock}") 2> /dev/null || return 1
return 0
}
# spin waiting for the lock with optional timeout.
# return once we have it, or the timeout has expired
spin_lock()
{
# $1 = lockfile
# $2 = optional timeout
local elapsed=0
while ! try_lock $1; do
[ "x$2" != "x" ] && [ $(( $elapsed == $2 )) -ne 0 ] && return 1
elapsed=$(($elapsed + 1))
sleep 1;
done
}
# release the lock
release_lock()
{
# $1 = lockfile
# make sure it is ours first.i
local lock="${LOCKDIR}/${1##*/}"
rm -f "${lock}"
return $?
}
command_exists()
{
# $1 = command to test for. It can be an executable in the path,
# a shell function, or a shell builtin.
type "$1" >/dev/null 2>&1
return $?
}
get_power_status()
{
RETVAL=0
on_ac_power
case "$?" in
"0")
echo "ac"
;;
"1")
echo "battery"
;;
"255")
echo "error"
RETVAL=1
;;
esac
return $RETVAL
}
_rmmod()
{
if modprobe -r "$1"; then
touch "${STORAGEDIR}/module:$1"
return 0
else
log "# could not unload '$1', usage count was $2"
return 1
fi
}
# this recursively unloads the given modules and all that depend on it
# first parameter is the module to be unloaded
modunload()
{
local MOD D C USED MODS I
local UNL="$(echo $1 |tr - _)" RET=1
while read MOD D C USED D; do
[ "$MOD" = "$UNL" ] || continue
if [ "$USED" = "-" ]; then
# no dependent modules, just try to remove this one.
_rmmod "$MOD" $C
RET=$?
else
# modules depend on this one. try to remove them first.
MODS="${USED%%*,}"
while [ -n "${MODS}" ]; do
# try to unload the last one first
MOD="${MODS##*,}"
modunload $MOD && RET=0
# prune the last one from the list
MODS="${MODS%,*}"
done
# if we unloaded at least one module, then let's
# try again!
[ $RET -eq 0 ] && modunload $MOD
RET=$?
fi
return $RET
done < /proc/modules
# if we came this far, there was nothing to do,
# the module is no longer loaded.
return 0
}
# reload all the modules in no particular order.
modreload()
{
for x in "${STORAGEDIR}"/module:* ; do
[ -O "${x}" ] && modprobe "${x##*:}" >/dev/null 2>&1
done
}
if ! command_exists service; then
service()
{
if [ -x "/etc/init.d/$1" ]; then
svc="$1"
shift
"/etc/init.d/$svc" "$@"
else
log "$1" $": unrecognized service" 1>&2
return 1
fi
}
fi
stopservice()
{
if service "$1" status 2>/dev/null | grep -c -q running; then
touch "${STORAGEDIR}/service:$1"
service "$1" stop
fi
}
restartservice()
{
[ -O "${STORAGEDIR}/service:$1" ] && service "$1" start
}
disablehook()
{
echo "${2:-${0$$*/}}" > "${STORAGEDIR}/disable_hook:${1##*/}"
}
savestate()
{
if [ -n "$2" ]; then
echo "$2" > "${STORAGEDIR}/state:$1"
else
cat > "${STORAGEDIR}/state:$1"
fi
}
state_exists()
{
[ -O "${STORAGEDIR}/state:$1" ]
}
restorestate()
{
state_exists "$1" && cat "${STORAGEDIR}/state:$1"
}
|
