list_processes: use lsof to list processes

Parsing the output from lsof had possibilities for race conditions.
Either due to short lived processes or issuing "tomb ps" from a terminal which cwd is from inside the tomb.
This would spit out available users on the system.
To avoid this use the lsof output directly.

In the future formatting could be reintroduced via commands like
"lsof +D "$tombmount" -F Lc" or "lsof +D "$tombmount" -F Lc0".

This fixes #503

tomb

@@ -3192,10 +3192,8 @@ umount_tomb() {
 
 list_processes() {
 	# $1 = (optional) name of tomb
-	# returns a list of process UIDs, one per line
+	# runs lsof on the mounted_tombs
 	local mounted_tombs i
-	local pnum puid pcmd powner found
-	found=0
 	mounted_tombs=(`list_tomb_mounts $1`)
 	if [[ "${#mounted_tombs}" -gt 0 ]]; then
 		if [[ -z $1 ]]; then
@@ -3207,21 +3205,9 @@ list_processes() {
 		for i in ${mounted_tombs}; do
 			_verbose "scanning tomb: ::1 tombmount::" $i
 			tombmount="${i[(ws:;:)2]}"
-			tombname=${i[(ws:;:)5]}
-			for pnum in ${(f)"$(_sudo lsof -t +D "$tombmount")"}; do
-				found=$(($found + 1))
-				_verbose "process found: $pnum"
-				puid=$(cat /proc/${pnum}/loginuid)
-				pcmd=$(cat /proc/${pnum}/cmdline)
-				powner=`_get_username $puid`
-				_verbose "process found: $pnum $pcmd ($powner)"
-				_message "::1 tombname:: ::2 cmd:: (::3 owner::)" \
-						 $tombname $pcmd $powner
-			done
+			_sudo lsof +D "${i[(ws:;:)2]}"
 		done
 	fi
-	_message "::1 foundproc:: running processes found inside ::2 numtombs:: open tombs" \
-			 $found ${#mounted_tombs}
 	return 0
 }