Initial commit of OpenSPARC T2 architecture model.
[OpenSPARC-T2-SAM] / sam-t2 / devtools / amd64 / man / man3 / Sys::Syslog.3
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129.\" ========================================================================
130.\"
131.IX Title "Sys::Syslog 3"
132.TH Sys::Syslog 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide"
133.SH "NAME"
134Sys::Syslog \- Perl interface to the UNIX syslog(3) calls
135.SH "VERSION"
136.IX Header "VERSION"
137Version 0.13
138.SH "SYNOPSIS"
139.IX Header "SYNOPSIS"
140.Vb 3
141\& use Sys::Syslog; # all except setlogsock(), or:
142\& use Sys::Syslog qw(:DEFAULT setlogsock); # default set, plus setlogsock()
143\& use Sys::Syslog qw(:standard :macros); # standard functions, plus macros
144.Ve
145.PP
146.Vb 5
147\& setlogsock $sock_type;
148\& openlog $ident, $logopt, $facility; # don't forget this
149\& syslog $priority, $format, @args;
150\& $oldmask = setlogmask $mask_priority;
151\& closelog;
152.Ve
153.SH "DESCRIPTION"
154.IX Header "DESCRIPTION"
155\&\f(CW\*(C`Sys::Syslog\*(C'\fR is an interface to the \s-1UNIX\s0 \f(CWsyslog(3)\fR program.
156Call \f(CW\*(C`syslog()\*(C'\fR with a string priority and a list of \f(CW\*(C`printf()\*(C'\fR args
157just like \f(CWsyslog(3)\fR.
158.SH "EXPORTS"
159.IX Header "EXPORTS"
160\&\f(CW\*(C`Sys::Syslog\*(C'\fR exports the following \f(CW\*(C`Exporter\*(C'\fR tags:
161.IP "\(bu" 4
162\&\f(CW\*(C`:standard\*(C'\fR exports the standard \f(CWsyslog(3)\fR functions:
163.Sp
164.Vb 1
165\& openlog closelog setlogmask syslog
166.Ve
167.IP "\(bu" 4
168\&\f(CW\*(C`:extended\*(C'\fR exports the Perl specific functions for \f(CWsyslog(3)\fR:
169.Sp
170.Vb 1
171\& setlogsock
172.Ve
173.IP "\(bu" 4
174\&\f(CW\*(C`:macros\*(C'\fR exports the symbols corresponding to most of your \f(CWsyslog(3)\fR
175macros. See \*(L"\s-1CONSTANTS\s0\*(R" for the supported constants and their meaning.
176.PP
177By default, \f(CW\*(C`Sys::Syslog\*(C'\fR exports the symbols from the \f(CW\*(C`:standard\*(C'\fR tag.
178.SH "FUNCTIONS"
179.IX Header "FUNCTIONS"
180.ie n .IP "\fBopenlog($ident, \fB$logopt\fB, \f(BI$facility\fB)\fR" 4
181.el .IP "\fBopenlog($ident, \f(CB$logopt\fB, \f(CB$facility\fB)\fR" 4
182.IX Item "openlog($ident, $logopt, $facility)"
183Opens the syslog.
184\&\f(CW$ident\fR is prepended to every message. \f(CW$logopt\fR contains zero or
185more of the words \f(CW\*(C`pid\*(C'\fR, \f(CW\*(C`ndelay\*(C'\fR, \f(CW\*(C`nowait\*(C'\fR. The \f(CW\*(C`cons\*(C'\fR option is
186ignored, since the failover mechanism will drop down to the console
187automatically if all other media fail. \f(CW$facility\fR specifies the
188part of the system to report about, for example \f(CW\*(C`LOG_USER\*(C'\fR or \f(CW\*(C`LOG_LOCAL0\*(C'\fR:
189see your \f(CWsyslog(3)\fR documentation for the facilities available in
190your system. Facility can be given as a string or a numeric macro.
191.Sp
192This function will croak if it can't connect to the syslog daemon.
193.Sp
194Note that \f(CW\*(C`openlog()\*(C'\fR now takes three arguments, just like \f(CWopenlog(3)\fR.
195.Sp
196\&\fBYou should use \f(BIopenlog()\fB before calling \f(BIsyslog()\fB.\fR
197.Sp
198\&\fBOptions\fR
199.RS 4
200.IP "*" 4
201\&\f(CW\*(C`ndelay\*(C'\fR \- Open the connection immediately (normally, the connection is
202opened when the first message is logged).
203.IP "*" 4
204\&\f(CW\*(C`nowait\*(C'\fR \- Don't wait for child processes that may have been created
205while logging the message. (The \s-1GNU\s0 C library does not create a child
206process, so this option has no effect on Linux.)
207.IP "*" 4
208\&\f(CW\*(C`pid\*(C'\fR \- Include \s-1PID\s0 with each message.
209.RE
210.RS 4
211.Sp
212\&\fBExamples\fR
213.Sp
214Open the syslog with options \f(CW\*(C`ndelay\*(C'\fR and \f(CW\*(C`pid\*(C'\fR, and with facility \f(CW\*(C`LOCAL0\*(C'\fR:
215.Sp
216.Vb 1
217\& openlog($name, "ndelay,pid", "local0");
218.Ve
219.Sp
220Same thing, but this time using the macro corresponding to \f(CW\*(C`LOCAL0\*(C'\fR:
221.Sp
222.Vb 1
223\& openlog($name, "ndelay,pid", LOG_LOCAL0);
224.Ve
225.RE
226.ie n .IP "\fBsyslog($priority, \fB$message\fB)\fR" 4
227.el .IP "\fBsyslog($priority, \f(CB$message\fB)\fR" 4
228.IX Item "syslog($priority, $message)"
229.PD 0
230.ie n .IP "\fBsyslog($priority, \fB$format\fB, \f(BI@args\fB)\fR" 4
231.el .IP "\fBsyslog($priority, \f(CB$format\fB, \f(CB@args\fB)\fR" 4
232.IX Item "syslog($priority, $format, @args)"
233.PD
234If \f(CW$priority\fR permits, logs \f(CW$message\fR or \f(CW\*(C`sprintf($format, @args)\*(C'\fR
235with the addition that \f(CW%m\fR in \f(CW$message\fR or \f(CW$format\fR is replaced with
236\&\f(CW"$!"\fR (the latest error message).
237.Sp
238\&\f(CW$priority\fR can specify a level, or a level and a facility. Levels and
239facilities can be given as strings or as macros.
240.Sp
241If you didn't use \f(CW\*(C`openlog()\*(C'\fR before using \f(CW\*(C`syslog()\*(C'\fR, \f(CW\*(C`syslog()\*(C'\fR will
242try to guess the \f(CW$ident\fR by extracting the shortest prefix of
243\&\f(CW$format\fR that ends in a \f(CW":"\fR.
244.Sp
245\&\fBExamples\fR
246.Sp
247.Vb 2
248\& syslog("info", $message); # informational level
249\& syslog(LOG_INFO, $message); # informational level
250.Ve
251.Sp
252.Vb 2
253\& syslog("info|local0", $message); # information level, Local0 facility
254\& syslog(LOG_INFO|LOG_LOCAL0, $message); # information level, Local0 facility
255.Ve
256.RS 4
257.IP "\fBNote\fR" 4
258.IX Item "Note"
259\&\f(CW\*(C`Sys::Syslog\*(C'\fR version v0.07 and older passed the \f(CW$message\fR as the
260formatting string to \f(CW\*(C`sprintf()\*(C'\fR even when no formatting arguments
261were provided. If the code calling \f(CW\*(C`syslog()\*(C'\fR might execute with
262older versions of this module, make sure to call the function as
263\&\f(CW\*(C`syslog($priority, "%s", $message)\*(C'\fR instead of \f(CW\*(C`syslog($priority,
264$message)\*(C'\fR. This protects against hostile formatting sequences that
265might show up if \f(CW$message\fR contains tainted data.
266.RE
267.RS 4
268.RE
269.IP "\fBsetlogmask($mask_priority)\fR" 4
270.IX Item "setlogmask($mask_priority)"
271Sets the log mask for the current process to \f(CW$mask_priority\fR and
272returns the old mask. If the mask argument is 0, the current log mask
273is not modified. See \*(L"Levels\*(R" for the list of available levels.
274.Sp
275\&\fBExamples\fR
276.Sp
277Only log errors:
278.Sp
279.Vb 1
280\& setlogmask(LOG_ERR);
281.Ve
282.Sp
283Log critical messages, errors and warnings:
284.Sp
285.Vb 1
286\& setlogmask(LOG_CRIT|LOG_ERR|LOG_WARNING);
287.Ve
288.IP "\fBsetlogsock($sock_type)\fR" 4
289.IX Item "setlogsock($sock_type)"
290.PD 0
291.ie n .IP "\fBsetlogsock($sock_type, \fB$stream_location\fB)\fR (added in 5.004_02)" 4
292.el .IP "\fBsetlogsock($sock_type, \f(CB$stream_location\fB)\fR (added in 5.004_02)" 4
293.IX Item "setlogsock($sock_type, $stream_location) (added in 5.004_02)"
294.PD
295Sets the socket type to be used for the next call to
296\&\f(CW\*(C`openlog()\*(C'\fR or \f(CW\*(C`syslog()\*(C'\fR and returns true on success,
297\&\f(CW\*(C`undef\*(C'\fR on failure.
298.Sp
299A value of \f(CW"unix"\fR will connect to the \s-1UNIX\s0 domain socket (in some
300systems a character special device) returned by the \f(CW\*(C`_PATH_LOG\*(C'\fR macro
301(if your system defines it), or \fI/dev/log\fR or \fI/dev/conslog\fR,
302whatever is writable. A value of 'stream' will connect to the stream
303indicated by the pathname provided as the optional second parameter.
304(For example Solaris and \s-1IRIX\s0 require \f(CW"stream"\fR instead of \f(CW"unix"\fR.)
305A value of \f(CW"inet"\fR will connect to an \s-1INET\s0 socket (either \f(CW\*(C`tcp\*(C'\fR or \f(CW\*(C`udp\*(C'\fR,
306tried in that order) returned by \f(CW\*(C`getservbyname()\*(C'\fR. \f(CW"tcp"\fR and \f(CW"udp"\fR can
307also be given as values. The value \f(CW"console"\fR will send messages
308directly to the console, as for the \f(CW"cons"\fR option in the logopts in
309\&\f(CW\*(C`openlog()\*(C'\fR.
310.Sp
311A reference to an array can also be passed as the first parameter.
312When this calling method is used, the array should contain a list of
313sock_types which are attempted in order.
314.Sp
315The default is to try \f(CW\*(C`tcp\*(C'\fR, \f(CW\*(C`udp\*(C'\fR, \f(CW\*(C`unix\*(C'\fR, \f(CW\*(C`stream\*(C'\fR, \f(CW\*(C`console\*(C'\fR.
316.Sp
317Giving an invalid value for \f(CW$sock_type\fR will croak.
318.IP "\fB\f(BIcloselog()\fB\fR" 4
319.IX Item "closelog()"
320Closes the log file and return true on success.
321.SH "EXAMPLES"
322.IX Header "EXAMPLES"
323.Vb 4
324\& openlog($program, 'cons,pid', 'user');
325\& syslog('info', '%s', 'this is another test');
326\& syslog('mail|warning', 'this is a better test: %d', time);
327\& closelog();
328.Ve
329.PP
330.Vb 1
331\& syslog('debug', 'this is the last test');
332.Ve
333.PP
334.Vb 3
335\& setlogsock('unix');
336\& openlog("$program $$", 'ndelay', 'user');
337\& syslog('notice', 'fooprogram: this is really done');
338.Ve
339.PP
340.Vb 3
341\& setlogsock('inet');
342\& $! = 55;
343\& syslog('info', 'problem was %m'); # %m == $! in syslog(3)
344.Ve
345.PP
346.Vb 5
347\& # Log to UDP port on $remotehost instead of logging locally
348\& setlogsock('udp');
349\& $Sys::Syslog::host = $remotehost;
350\& openlog($program, 'ndelay', 'user');
351\& syslog('info', 'something happened over here');
352.Ve
353.SH "CONSTANTS"
354.IX Header "CONSTANTS"
355.Sh "Facilities"
356.IX Subsection "Facilities"
357.IP "\(bu" 4
358\&\f(CW\*(C`LOG_AUTH\*(C'\fR \- security/authorization messages
359.IP "\(bu" 4
360\&\f(CW\*(C`LOG_AUTHPRIV\*(C'\fR \- security/authorization messages (private)
361.IP "\(bu" 4
362\&\f(CW\*(C`LOG_CRON\*(C'\fR \- clock daemon (\fBcron\fR and \fBat\fR)
363.IP "\(bu" 4
364\&\f(CW\*(C`LOG_DAEMON\*(C'\fR \- system daemons without separate facility value
365.IP "\(bu" 4
366\&\f(CW\*(C`LOG_FTP\*(C'\fR \- ftp daemon
367.IP "\(bu" 4
368\&\f(CW\*(C`LOG_KERN\*(C'\fR \- kernel messages
369.IP "\(bu" 4
370\&\f(CW\*(C`LOG_LOCAL0\*(C'\fR through \f(CW\*(C`LOG_LOCAL7\*(C'\fR \- reserved for local use
371.IP "\(bu" 4
372\&\f(CW\*(C`LOG_LPR\*(C'\fR \- line printer subsystem
373.IP "\(bu" 4
374\&\f(CW\*(C`LOG_MAIL\*(C'\fR \- mail subsystem
375.IP "\(bu" 4
376\&\f(CW\*(C`LOG_NEWS\*(C'\fR \- \s-1USENET\s0 news subsystem
377.IP "\(bu" 4
378\&\f(CW\*(C`LOG_SYSLOG\*(C'\fR \- messages generated internally by \fBsyslogd\fR
379.IP "\(bu" 4
380\&\f(CW\*(C`LOG_USER\*(C'\fR (default) \- generic user-level messages
381.IP "\(bu" 4
382\&\f(CW\*(C`LOG_UUCP\*(C'\fR \- \s-1UUCP\s0 subsystem
383.Sh "Levels"
384.IX Subsection "Levels"
385.IP "\(bu" 4
386\&\f(CW\*(C`LOG_EMERG\*(C'\fR \- system is unusable
387.IP "\(bu" 4
388\&\f(CW\*(C`LOG_ALERT\*(C'\fR \- action must be taken immediately
389.IP "\(bu" 4
390\&\f(CW\*(C`LOG_CRIT\*(C'\fR \- critical conditions
391.IP "\(bu" 4
392\&\f(CW\*(C`LOG_ERR\*(C'\fR \- error conditions
393.IP "\(bu" 4
394\&\f(CW\*(C`LOG_WARNING\*(C'\fR \- warning conditions
395.IP "\(bu" 4
396\&\f(CW\*(C`LOG_NOTICE\*(C'\fR \- normal, but significant, condition
397.IP "\(bu" 4
398\&\f(CW\*(C`LOG_INFO\*(C'\fR \- informational message
399.IP "\(bu" 4
400\&\f(CW\*(C`LOG_DEBUG\*(C'\fR \- debug-level message
401.SH "DIAGNOSTICS"
402.IX Header "DIAGNOSTICS"
403.IP "Invalid argument passed to setlogsock" 4
404.IX Item "Invalid argument passed to setlogsock"
405\&\fB(F)\fR You gave \f(CW\*(C`setlogsock()\*(C'\fR an invalid value for \f(CW$sock_type\fR.
406.IP "no connection to syslog available" 4
407.IX Item "no connection to syslog available"
408\&\fB(F)\fR \f(CW\*(C`syslog()\*(C'\fR failed to connect to the specified socket.
409.ie n .IP "stream passed to setlogsock, but %s is not writable" 4
410.el .IP "stream passed to setlogsock, but \f(CW%s\fR is not writable" 4
411.IX Item "stream passed to setlogsock, but %s is not writable"
412\&\fB(W)\fR You asked \f(CW\*(C`setlogsock()\*(C'\fR to use a stream socket, but the given
413path is not writable.
414.IP "stream passed to setlogsock, but could not find any device" 4
415.IX Item "stream passed to setlogsock, but could not find any device"
416\&\fB(W)\fR You asked \f(CW\*(C`setlogsock()\*(C'\fR to use a stream socket, but didn't
417provide a path, and \f(CW\*(C`Sys::Syslog\*(C'\fR was unable to find an appropriate one.
418.IP "tcp passed to setlogsock, but tcp service unavailable" 4
419.IX Item "tcp passed to setlogsock, but tcp service unavailable"
420\&\fB(W)\fR You asked \f(CW\*(C`setlogsock()\*(C'\fR to use a \s-1TCP\s0 socket, but the service
421is not available on the system.
422.ie n .IP "syslog: expecting argument %s" 4
423.el .IP "syslog: expecting argument \f(CW%s\fR" 4
424.IX Item "syslog: expecting argument %s"
425\&\fB(F)\fR You forgot to give \f(CW\*(C`syslog()\*(C'\fR the indicated argument.
426.ie n .IP "syslog: invalid level/facility: %s" 4
427.el .IP "syslog: invalid level/facility: \f(CW%s\fR" 4
428.IX Item "syslog: invalid level/facility: %s"
429\&\fB(F)\fR You specified an invalid level or facility, like \f(CW\*(C`LOG_KERN\*(C'\fR
430(which is reserved to the kernel).
431.ie n .IP "syslog: too many levels given: %s" 4
432.el .IP "syslog: too many levels given: \f(CW%s\fR" 4
433.IX Item "syslog: too many levels given: %s"
434\&\fB(F)\fR You specified too many levels.
435.ie n .IP "syslog: too many facilities given: %s" 4
436.el .IP "syslog: too many facilities given: \f(CW%s\fR" 4
437.IX Item "syslog: too many facilities given: %s"
438\&\fB(F)\fR You specified too many facilities.
439.IP "syslog: level must be given" 4
440.IX Item "syslog: level must be given"
441\&\fB(F)\fR You forgot to specify a level.
442.IP "udp passed to setlogsock, but udp service unavailable" 4
443.IX Item "udp passed to setlogsock, but udp service unavailable"
444\&\fB(W)\fR You asked \f(CW\*(C`setlogsock()\*(C'\fR to use a \s-1UDP\s0 socket, but the service
445is not available on the system.
446.IP "unix passed to setlogsock, but path not available" 4
447.IX Item "unix passed to setlogsock, but path not available"
448\&\fB(W)\fR You asked \f(CW\*(C`setlogsock()\*(C'\fR to use a \s-1UNIX\s0 socket, but \f(CW\*(C`Sys::Syslog\*(C'\fR
449was unable to find an appropriate an appropriate device.
450.SH "SEE ALSO"
451.IX Header "SEE ALSO"
452\&\fIsyslog\fR\|(3)
453.PP
454\&\fISyslogging with Perl\fR, <http://lexington.pm.org/meetings/022001.html>
455.SH "AUTHOR"
456.IX Header "AUTHOR"
457Tom Christiansen <\fItchrist@perl.com\fR> and Larry Wall
458<\fIlarry@wall.org\fR>.
459.PP
460\&\s-1UNIX\s0 domain sockets added by Sean Robinson
461<\fIrobinson_s@sc.maricopa.edu\fR> with support from Tim Bunce
462<\fITim.Bunce@ig.co.uk\fR> and the \f(CW\*(C`perl5\-porters\*(C'\fR mailing list.
463.PP
464Dependency on \fIsyslog.ph\fR replaced with \s-1XS\s0 code by Tom Hughes
465<\fItom@compton.nu\fR>.
466.PP
467Code for \f(CW\*(C`constant()\*(C'\fRs regenerated by Nicholas Clark <\fInick@ccl4.org\fR>.
468.PP
469Failover to different communication modes by Nick Williams
470<\fINick.Williams@morganstanley.com\fR>.
471.PP
472Extracted from core distribution for publishing on the \s-1CPAN\s0 by
473Se\*'bastien Aperghis-Tramoni <sebastien@aperghis.net>.
474.SH "BUGS"
475.IX Header "BUGS"
476Please report any bugs or feature requests to
477\&\f(CW\*(C`bug\-sys\-syslog at rt.cpan.org\*(C'\fR, or through the web interface at
478<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Sys\-Syslog>.
479I will be notified, and then you'll automatically be notified of progress on
480your bug as I make changes.
481.SH "SUPPORT"
482.IX Header "SUPPORT"
483You can find documentation for this module with the perldoc command.
484.PP
485.Vb 1
486\& perldoc Sys::Syslog
487.Ve
488.PP
489You can also look for information at:
490.IP "* AnnoCPAN: Annotated \s-1CPAN\s0 documentation" 4
491.IX Item "AnnoCPAN: Annotated CPAN documentation"
492<http://annocpan.org/dist/Sys\-Syslog>
493.IP "* \s-1CPAN\s0 Ratings" 4
494.IX Item "CPAN Ratings"
495<http://cpanratings.perl.org/d/Sys\-Syslog>
496.IP "* \s-1RT:\s0 \s-1CPAN\s0's request tracker" 4
497.IX Item "RT: CPAN's request tracker"
498<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Sys\-Syslog>
499.IP "* Search \s-1CPAN\s0" 4
500.IX Item "Search CPAN"
501<http://search.cpan.org/dist/Sys\-Syslog>
502.SH "LICENSE"
503.IX Header "LICENSE"
504This program is free software; you can redistribute it and/or modify it
505under the same terms as Perl itself.