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Smalltalk implementation of logging framework ideas
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(C) 2011 by Holger Hans Peter Freyther
All Rights Reserved
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
LogTarget subclass: LogTargetSyslog [
| prefix |
<comment: 'I can log everything to the syslog.'>
<category: 'OsmoLogging-Syslog'>
LogMap := nil.
LogTargetSyslog class >> LOG_USER [
<category: 'c-facility'>
^ 8
LogTargetSyslog class >> logLevelMap [
^ LogMap ifNil: [ LogMap := Dictionary new
at: LogLevel debug put: 7;
at: LogLevel info put: 6;
at: LogLevel notice put: 5;
at: LogLevel error put: 3;
LogTargetSyslog class >> openlog: aIdent option: aOption facility: aFacility [
"Free any previous string"
Smalltalk at: #SYSLOG_NAME put: nil.
Smalltalk at: #SYSLOG_NAME put: aIdent asCData.
self c_closelog.
self c_openlog: SYSLOG_NAME opt: aOption facility: aFacility.
^ self new
LogTargetSyslog class >> c_openlog: ident opt: aOpt facility: aFac [
<category: 'c-interface'>
<cCall: 'openlog' returning: #void args: #(#cObject #int #int)>
LogTargetSyslog class >> c_syslog: prio fmt: aFormat args: args[
<category: 'c-interface'>
<cCall: 'syslog' returning: #void args: #(#int #string #variadic)>
LogTargetSyslog class >> c_closelog [
<category: 'c-interface'>
<cCall: 'closelog' returning: #void args: #()>
LogTargetSyslog class >> initialize [
<category: 'c-interface'>
DLD addLibrary: 'libc'.
"Workaround Debian multiarch issues in finding libc"
DLD addLibrary: 'libm'.
ObjectMemory addDependent: self.
LogTargetSyslog class >> update: aSymbol [
"We need to forget the C String we have allocated as we are running
in a new VM right now. Maybe we will be re-opened by someone."
aSymbol = #returnFromSnapshot ifTrue: [
Smalltalk at: #SYSLOG_NAME put: nil.
print: aMessage [
<category: 'output'>
| level |
level := self class logLevelMap at: aMessage level.
self class c_syslog: level fmt: '%s%s' args: {self prefix. aMessage msg}.
exception: aMessage [
| level |
level := self class logLevelMap at: aMessage level.
self class c_syslog: level fmt: '%s%s'
args: {self prefix. 'EXCEPTION occured'}.
self print: aMessage.
prefix: aMsg [
prefix := aMsg.
prefix [
^ prefix ifNil: ['']
Eval [
LogTargetSyslog initialize.