]>
git.ipfire.org Git - people/ms/network.git/blob - src/functions/functions.lock
2 ###############################################################################
4 # IPFire.org - A linux based firewall #
5 # Copyright (C) 2012 Michael Tremer & Christian Schmidt #
7 # This program is free software: you can redistribute it and/or modify #
8 # it under the terms of the GNU General Public License as published by #
9 # the Free Software Foundation, either version 3 of the License, or #
10 # (at your option) any later version. #
12 # This program is distributed in the hope that it will be useful, #
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of #
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
15 # GNU General Public License for more details. #
17 # You should have received a copy of the GNU General Public License #
18 # along with this program. If not, see <http://www.gnu.org/licenses/>. #
20 ###############################################################################
25 if [ "${name:0:1}" = "/" ]; then
28 echo "${LOCK_DIR}/network-${name}"
36 # Move locks with name only into lock directory
37 if [ "${lock:0:1}" != "/" ]; then
38 lock
="${LOCK_DIR}/${lock}"
43 # Make partent directory
44 make_parent_directory
"${lock}"
47 log DEBUG
"Trying to acquire lock ${lock}"
49 # Try to acquire lock on fd 9
50 if ! flock
-w "${timeout}" 9; then
51 log ERROR
"Failed to acquire lock ${lock} after ${timeout} seconds"
55 log DEBUG
"Acquired lock ${lock}"
57 # Remember return code
63 log DEBUG
"Released lock ${lock}"
66 ) 9>${lock} ||
exit $?
73 local lockfile
=$
(__lock_path
${name})
75 if [ -e "${lockfile}" ]; then
86 # timeout value in seconds
89 if ! isset timeout
; then
93 local lockfile
=$
(__lock_path
${name})
95 timeout
=$
(( ${timeout} * 4 ))
97 log DEBUG
"Acquiring lock '${name}'"
99 # Wait until lock is available
100 while [ ${timeout} -gt 0 ] && [ -e "${lockfile}" ]; do
101 timeout
=$
(( ${timeout} - 1 ))
105 # If another lock still exists, we return an error
106 if [ -e "${lockfile}" ]; then
107 error
"Could not acquire lock '${name}'"
111 # Write out pid to the lockfile and make sure that
112 # nobody else can access it.
113 echo "$$" > ${lockfile}
114 chmod 600 ${lockfile}
121 local lockfile
=$
(__lock_path
${name})
123 log DEBUG
"Releasing lock '${name}'"
125 # Remove the lockfile (okay if it does not exist).