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Commit | Line | Data |
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8c63fa13 MT |
1 | #!/bin/bash |
2 | ############################################################################### | |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
5 | # Copyright (C) 2012 Michael Tremer & Christian Schmidt # | |
6 | # # | |
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. # | |
11 | # # | |
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. # | |
16 | # # | |
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/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
f5ba5f6b MT |
22 | __lock_path() { |
23 | local name=${1} | |
24 | ||
25 | if [ "${name:0:1}" = "/" ]; then | |
26 | echo "${name}" | |
27 | else | |
28 | echo "${LOCK_DIR}/network-${name}" | |
29 | fi | |
30 | } | |
31 | ||
c73dc5dc | 32 | lock_exists() { |
f5ba5f6b MT |
33 | local name=${1} |
34 | assert isset name | |
35 | ||
36 | local lockfile=$(__lock_path ${name}) | |
8c63fa13 | 37 | |
c73dc5dc JS |
38 | if [ -e "${lockfile}" ]; then |
39 | return ${EXIT_TRUE} | |
40 | else | |
41 | return ${EXIT_FALSE} | |
42 | fi | |
43 | } | |
44 | ||
45 | lock_acquire() { | |
46 | local name=${1} | |
47 | assert isset name | |
48 | ||
8c63fa13 | 49 | # timeout value in seconds |
c73dc5dc JS |
50 | local timeout=${2} |
51 | ||
52 | if ! isset timeout; then | |
53 | timeout=0 | |
54 | fi | |
55 | ||
56 | local lockfile=$(__lock_path ${name}) | |
57 | ||
b9e3f4a2 | 58 | timeout=$(( ${timeout} * 4 )) |
8c63fa13 | 59 | |
f5ba5f6b | 60 | log DEBUG "Acquiring lock '${name}'" |
8c63fa13 | 61 | |
c73dc5dc JS |
62 | # Wait until lock is available |
63 | while [ ${timeout} -gt 0 ] && [ -e "${lockfile}" ]; do | |
8c63fa13 | 64 | timeout=$(( ${timeout} - 1 )) |
b9e3f4a2 | 65 | sleep 0.25 |
8c63fa13 MT |
66 | done |
67 | ||
c73dc5dc JS |
68 | # If another lock still exists, we return an error |
69 | if [ -e "${lockfile}" ]; then | |
70 | error "Could not acquire lock '${name}'" | |
71 | return ${EXIT_ERROR} | |
72 | fi | |
8c63fa13 MT |
73 | |
74 | # Write out pid to the lockfile and make sure that | |
75 | # nobody else can access it. | |
76 | echo "$$" > ${lockfile} | |
77 | chmod 600 ${lockfile} | |
78 | } | |
79 | ||
1c6a4e30 | 80 | lock_release() { |
f5ba5f6b MT |
81 | local name=${1} |
82 | assert isset name | |
83 | ||
84 | local lockfile=$(__lock_path ${name}) | |
8c63fa13 | 85 | |
f5ba5f6b | 86 | log DEBUG "Releasing lock '${name}'" |
8c63fa13 MT |
87 | |
88 | # Remove the lockfile (okay if it does not exist). | |
89 | rm -f ${lockfile} | |
90 | } |