3 use warnings::register;
5 use POSIX qw(strftime setlocale LC_TIME);
15 standard => [qw(openlog syslog closelog setlogmask)],
16 extended => [qw(setlogsock)],
20 LOG_ALERT LOG_CRIT LOG_DEBUG LOG_EMERG LOG_ERR
21 LOG_INFO LOG_NOTICE LOG_WARNING
26 LOG_AUTH LOG_AUTHPRIV LOG_CRON LOG_DAEMON LOG_FTP
27 LOG_INSTALL LOG_KERN LOG_LAUNCHD LOG_LFMT LOG_LOCAL0
28 LOG_LOCAL1 LOG_LOCAL2 LOG_LOCAL3 LOG_LOCAL4 LOG_LOCAL5
29 LOG_LOCAL6 LOG_LOCAL7 LOG_LPR LOG_MAIL LOG_NETINFO
30 LOG_NEWS LOG_RAS LOG_REMOTEAUTH LOG_SYSLOG LOG_USER LOG_UUCP
35 LOG_CONS LOG_PID LOG_NDELAY LOG_NOWAIT LOG_ODELAY LOG_PERROR
40 LOG_FACMASK LOG_NFACILITIES LOG_PRIMASK
47 @{$EXPORT_TAGS{standard}},
51 @{$EXPORT_TAGS{extended}},
52 @{$EXPORT_TAGS{macros}},
57 XSLoader::load('Sys::Syslog', $VERSION);
61 push @ISA, 'DynaLoader';
62 bootstrap Sys::Syslog $VERSION;
70 our $host; # host to send syslog messages to
75 my $connected = 0; # flag to indicate if we're connected or not
76 my $syslog_send; # coderef of the function used to send messages
77 my $syslog_path = undef; # syslog path for "stream" and "unix" mechanisms
78 my $transmit_ok = 0; # flag to indicate if the last message was transmited
79 my $current_proto = undef; # current mechanism used to transmit messages
80 my $ident = ''; # identifiant prepended to each message
81 my $facility = ''; # current facility
82 my $maskpri = LOG_UPTO(&LOG_DEBUG); # current log mask
91 # it would be nice to try stream/unix first, since that will be
92 # most efficient. However streams are dodgy - see _syslog_send_stream
93 my @connectMethods = qw(native tcp udp unix stream console);
94 if ($^O =~ /^(freebsd|linux)$/) {
95 @connectMethods = grep { $_ ne 'udp' } @connectMethods;
97 my @defaultMethods = @connectMethods;
98 my @fallbackMethods = ();
100 # coderef for a nicer handling of errors
101 my $err_sub = $options{nofatal} ? \&warnings::warnif : \&croak;
105 # This AUTOLOAD is used to 'autoload' constants from the constant()
109 ($constname = $AUTOLOAD) =~ s/.*:://;
110 croak "Sys::Syslog::constant() not defined" if $constname eq 'constant';
111 my ($error, $val) = constant($constname);
112 croak $error if $error;
114 *$AUTOLOAD = sub { $val };
120 ($ident, my $logopt, $facility) = @_;
122 for my $opt (split /\b/, $logopt) {
123 $options{$opt} = 1 if exists $options{$opt}
126 $err_sub = $options{nofatal} ? \&warnings::warnif : \&croak;
127 return 1 unless $options{ndelay};
132 $facility = $ident = '';
137 my $oldmask = $maskpri;
138 $maskpri = shift unless $_[0] == 0;
144 $syslog_path = shift;
145 disconnect_log() if $connected;
147 @fallbackMethods = ();
148 @connectMethods = @defaultMethods;
150 if (ref $setsock eq 'ARRAY') {
151 @connectMethods = @$setsock;
153 } elsif (lc $setsock eq 'stream') {
154 unless (defined $syslog_path) {
155 my @try = qw(/dev/log /dev/conslog);
156 if (length &_PATH_LOG) { # Undefined _PATH_LOG is "".
157 unshift @try, &_PATH_LOG;
165 warnings::warnif "stream passed to setlogsock, but could not find any device"
166 unless defined $syslog_path
168 unless (-w $syslog_path) {
169 warnings::warnif "stream passed to setlogsock, but $syslog_path is not writable";
172 @connectMethods = ( 'stream' );
175 } elsif (lc $setsock eq 'unix') {
176 if (length _PATH_LOG() || (defined $syslog_path && -w $syslog_path)) {
177 $syslog_path = _PATH_LOG() unless defined $syslog_path;
178 @connectMethods = ( 'unix' );
180 warnings::warnif 'unix passed to setlogsock, but path not available';
184 } elsif (lc $setsock eq 'native') {
185 @connectMethods = ( 'native' );
187 } elsif (lc $setsock eq 'tcp') {
188 if (getservbyname('syslog', 'tcp') || getservbyname('syslogng', 'tcp')) {
189 @connectMethods = ( 'tcp' );
191 warnings::warnif "tcp passed to setlogsock, but tcp service unavailable";
195 } elsif (lc $setsock eq 'udp') {
196 if (getservbyname('syslog', 'udp')) {
197 @connectMethods = ( 'udp' );
199 warnings::warnif "udp passed to setlogsock, but udp service unavailable";
203 } elsif (lc $setsock eq 'inet') {
204 @connectMethods = ( 'tcp', 'udp' );
206 } elsif (lc $setsock eq 'console') {
207 @connectMethods = ( 'console' );
210 croak "Invalid argument passed to setlogsock; must be 'stream', 'unix', 'native', 'tcp', 'udp' or 'inet'"
217 my $priority = shift;
220 my (@words, $num, $numpri, $numfac, $sum);
222 my $fail_time = undef;
225 my $facility = $facility; # may need to change temporarily.
227 croak "syslog: expecting argument \$priority" unless defined $priority;
228 croak "syslog: expecting argument \$format" unless defined $mask;
230 @words = split(/\W+/, $priority, 2); # Allow "level" or "level|facility".
235 $num = xlate($_); # Translate word to number.
237 croak "syslog: invalid level/facility: $_"
239 elsif ($num <= &LOG_PRIMASK) {
240 croak "syslog: too many levels given: $_" if defined $numpri;
242 return 0 unless LOG_MASK($numpri) & $maskpri;
245 croak "syslog: too many facilities given: $_" if defined $numfac;
251 croak "syslog: level must be given" unless defined $numpri;
253 if (not defined $numfac) { # Facility not specified in this call.
254 $facility = 'user' unless $facility;
255 $numfac = xlate($facility);
258 connect_log() unless $connected;
261 # escape percent signs if sprintf will be called
262 $error =~ s/%/%%/g if @_;
263 # replace %m with $err, if preceded by an even number of percent signs
264 $mask =~ s/(?<!%)((?:%%)*)%m/$1$error/g;
267 $mask .= "\n" unless $mask =~ /\n$/;
268 $message = @_ ? sprintf($mask, @_) : $mask;
270 if($current_proto eq 'native') {
276 if (!$whoami && $mask =~ /^(\S.*?):\s?(.*)/) {
282 $whoami = getlogin() || getpwuid($<) || 'syslog';
285 $whoami .= "[$$]" if $options{pid};
287 $sum = $numpri + $numfac;
288 my $oldlocale = setlocale(LC_TIME);
289 setlocale(LC_TIME, 'C');
290 my $timestamp = strftime "%b %e %T", localtime;
291 setlocale(LC_TIME, $oldlocale);
292 $buf = "<$sum>$timestamp $whoami: $message\0";
295 # it's possible that we'll get an error from sending
296 # (e.g. if method is UDP and there is no UDP listener,
297 # then we'll get ECONNREFUSED on the send). So what we
298 # want to do at this point is to fallback onto a different
300 while (scalar @fallbackMethods || $syslog_send) {
301 if ($failed && (time - $fail_time) > 60) {
302 # it's been a while... maybe things have been fixed
303 @fallbackMethods = ();
305 $transmit_ok = 0; # make it look like a fresh attempt
309 if ($connected && !connection_ok()) {
310 # Something was OK, but has now broken. Remember coz we'll
311 # want to go back to what used to be OK.
312 $failed = $current_proto unless $failed;
317 connect_log() unless $connected;
318 $failed = undef if ($current_proto && $failed && $current_proto eq $failed);
321 if ($syslog_send->($buf, $numpri)) {
325 # typically doesn't happen, since errors are rare from write().
329 # could not send, could not fallback onto a working
330 # connection method. Lose.
334 sub _syslog_send_console {
336 chop($buf); # delete the NUL from the end
337 # The console print is a method which could block
338 # so we do it in a child process and always return success
340 if (my $pid = fork) {
342 if ($options{nowait}) {
345 if (waitpid($pid, 0) >= 0) {
348 # it's possible that the caller has other
349 # plans for SIGCHLD, so let's not interfere
354 if (open(CONS, ">/dev/console")) {
355 my $ret = print CONS $buf . "\r"; # XXX: should this be \x0A ?
356 exit $ret if defined $pid;
359 exit if defined $pid;
363 sub _syslog_send_stream {
365 # XXX: this only works if the OS stream implementation makes a write
366 # look like a putmsg() with simple header. For instance it works on
367 # Solaris 8 but not Solaris 7.
368 # To be correct, it should use a STREAMS API, but perl doesn't have one.
369 return syswrite(SYSLOG, $buf, length($buf));
372 sub _syslog_send_socket {
374 return syswrite(SYSLOG, $buf, length($buf));
375 #return send(SYSLOG, $buf, 0);
378 sub _syslog_send_native {
379 my ($buf, $numpri) = @_;
380 eval { syslog_xs($numpri, $buf) };
387 # private function to translate names to numeric values
391 return $name+0 if $name =~ /^\s*\d+\s*$/;
393 $name = "LOG_$name" unless $name =~ /^LOG_/;
394 $name = "Sys::Syslog::$name";
395 # Can't have just eval { &$name } || -1 because some LOG_XXX may be zero.
396 my $value = eval { no strict 'refs'; &$name };
397 defined $value ? $value : -1;
403 # This function acts as a kind of front-end: it tries to connect to
404 # a syslog service using the selected methods, trying each one in the
408 @fallbackMethods = @connectMethods unless scalar @fallbackMethods;
409 if ($transmit_ok && $current_proto) {
410 # Retry what we were on, because it has worked in the past.
411 unshift(@fallbackMethods, $current_proto);
416 while ($proto = shift @fallbackMethods) {
418 my $fn = "connect_$proto";
419 $connected = &$fn(\@errs) if defined &$fn;
425 $current_proto = $proto;
426 my($old) = select(SYSLOG); $| = 1; select($old);
428 @fallbackMethods = ();
429 $err_sub->(join "\n\t- ", "no connection to syslog available", @errs);
437 my $tcp = getprotobyname('tcp');
439 push @$errs, "getprotobyname failed for tcp";
443 my $syslog = getservbyname('syslog', 'tcp');
444 $syslog = getservbyname('syslogng', 'tcp') unless defined $syslog;
445 if (!defined $syslog) {
446 push @$errs, "getservbyname failed for syslog/tcp and syslogng/tcp";
452 $addr = inet_aton($host);
454 push @$errs, "can't lookup $host";
458 $addr = INADDR_LOOPBACK;
460 $addr = sockaddr_in($syslog, $addr);
462 if (!socket(SYSLOG, AF_INET, SOCK_STREAM, $tcp)) {
463 push @$errs, "tcp socket: $!";
466 setsockopt(SYSLOG, SOL_SOCKET, SO_KEEPALIVE, 1);
467 setsockopt(SYSLOG, &IPPROTO_TCP, &TCP_NODELAY, 1);
468 if (!connect(SYSLOG, $addr)) {
469 push @$errs, "tcp connect: $!";
473 $syslog_send = \&_syslog_send_socket;
481 my $udp = getprotobyname('udp');
483 push @$errs, "getprotobyname failed for udp";
487 my $syslog = getservbyname('syslog', 'udp');
488 if (!defined $syslog) {
489 push @$errs, "getservbyname failed for syslog/udp";
495 $addr = inet_aton($host);
497 push @$errs, "can't lookup $host";
501 $addr = INADDR_LOOPBACK;
503 $addr = sockaddr_in($syslog, $addr);
505 if (!socket(SYSLOG, AF_INET, SOCK_DGRAM, $udp)) {
506 push @$errs, "udp socket: $!";
509 if (!connect(SYSLOG, $addr)) {
510 push @$errs, "udp connect: $!";
514 # We want to check that the UDP connect worked. However the only
515 # way to do that is to send a message and see if an ICMP is returned
516 _syslog_send_socket("");
517 if (!connection_ok()) {
518 push @$errs, "udp connect: nobody listening";
522 $syslog_send = \&_syslog_send_socket;
529 # might want syslog_path to be variable based on syslog.h (if only
531 $syslog_path = '/dev/conslog' unless defined $syslog_path;
532 if (!-w $syslog_path) {
533 push @$errs, "stream $syslog_path is not writable";
536 if (!open(SYSLOG, ">" . $syslog_path)) {
537 push @$errs, "stream can't open $syslog_path: $!";
540 $syslog_send = \&_syslog_send_stream;
547 $syslog_path ||= _PATH_LOG() if length _PATH_LOG();
549 if (not defined $syslog_path) {
550 push @$errs, "_PATH_LOG not available in syslog.h and no user-supplied socket path";
554 if (! -S $syslog_path) {
555 push @$errs, "$syslog_path is not a socket";
559 my $addr = sockaddr_un($syslog_path);
561 push @$errs, "can't locate $syslog_path";
564 if (!socket(SYSLOG, AF_UNIX, SOCK_STREAM, 0)) {
565 push @$errs, "unix stream socket: $!";
568 if (!connect(SYSLOG, $addr)) {
569 if (!socket(SYSLOG, AF_UNIX, SOCK_DGRAM, 0)) {
570 push @$errs, "unix dgram socket: $!";
573 if (!connect(SYSLOG, $addr)) {
574 push @$errs, "unix dgram connect: $!";
579 $syslog_send = \&_syslog_send_socket;
588 # reconstruct the numeric equivalent of the options
589 for my $opt (keys %options) {
590 $logopt += xlate($opt) if $options{$opt}
593 eval { openlog_xs($ident, $logopt, xlate($facility)) };
599 $syslog_send = \&_syslog_send_native;
604 sub connect_console {
606 if (!-w '/dev/console') {
607 push @$errs, "console is not writable";
610 $syslog_send = \&_syslog_send_console;
614 # to test if the connection is still good, we need to check if any
615 # errors are present on the connection. The errors will not be raised
616 # by a write. Instead, sockets are made readable and the next read
617 # would cause the error to be returned. Unfortunately the syslog
618 # 'protocol' never provides anything for us to read. But with
619 # judicious use of select(), we can see if it would be readable...
621 return 1 if defined $current_proto and (
622 $current_proto eq 'native' or $current_proto eq 'console'
625 vec($rin, fileno(SYSLOG), 1) = 1;
626 my $ret = select $rin, undef, $rin, 0;
627 return ($ret ? 0 : 1);
632 $syslog_send = undef;
634 if($current_proto eq 'native') {
648 Sys::Syslog - Perl interface to the UNIX syslog(3) calls
656 use Sys::Syslog; # all except setlogsock(), or:
657 use Sys::Syslog qw(:DEFAULT setlogsock); # default set, plus setlogsock()
658 use Sys::Syslog qw(:standard :macros); # standard functions, plus macros
660 setlogsock $sock_type;
661 openlog $ident, $logopt, $facility; # don't forget this
662 syslog $priority, $format, @args;
663 $oldmask = setlogmask $mask_priority;
669 C<Sys::Syslog> is an interface to the UNIX C<syslog(3)> program.
670 Call C<syslog()> with a string priority and a list of C<printf()> args
671 just like C<syslog(3)>.
676 C<Sys::Syslog> exports the following C<Exporter> tags:
682 C<:standard> exports the standard C<syslog(3)> functions:
684 openlog closelog setlogmask syslog
688 C<:extended> exports the Perl specific functions for C<syslog(3)>:
694 C<:macros> exports the symbols corresponding to most of your C<syslog(3)>
695 macros and the C<LOG_UPTO()> and C<LOG_MASK()> functions.
696 See L<"CONSTANTS"> for the supported constants and their meaning.
700 By default, C<Sys::Syslog> exports the symbols from the C<:standard> tag.
707 =item B<openlog($ident, $logopt, $facility)>
710 C<$ident> is prepended to every message. C<$logopt> contains zero or
711 more of the options detailed below. C<$facility> specifies the part
712 of the system to report about, for example C<LOG_USER> or C<LOG_LOCAL0>:
713 see L<"Facilities"> for a list of well-known facilities, and your
714 C<syslog(3)> documentation for the facilities available in your system.
715 Check L<"SEE ALSO"> for useful links. Facility can be given as a string
718 This function will croak if it can't connect to the syslog daemon.
720 Note that C<openlog()> now takes three arguments, just like C<openlog(3)>.
722 B<You should use C<openlog()> before calling C<syslog()>.>
730 C<cons> - This option is ignored, since the failover mechanism will drop
731 down to the console automatically if all other media fail.
735 C<ndelay> - Open the connection immediately (normally, the connection is
736 opened when the first message is logged).
740 C<nofatal> - When set to true, C<openlog()> and C<syslog()> will only
741 emit warnings instead of dying if the connection to the syslog can't
746 C<nowait> - Don't wait for child processes that may have been created
747 while logging the message. (The GNU C library does not create a child
748 process, so this option has no effect on Linux.)
752 C<pid> - Include PID with each message.
758 Open the syslog with options C<ndelay> and C<pid>, and with facility C<LOCAL0>:
760 openlog($name, "ndelay,pid", "local0");
762 Same thing, but this time using the macro corresponding to C<LOCAL0>:
764 openlog($name, "ndelay,pid", LOG_LOCAL0);
767 =item B<syslog($priority, $message)>
769 =item B<syslog($priority, $format, @args)>
771 If C<$priority> permits, logs C<$message> or C<sprintf($format, @args)>
772 with the addition that C<%m> in $message or C<$format> is replaced with
773 C<"$!"> (the latest error message).
775 C<$priority> can specify a level, or a level and a facility. Levels and
776 facilities can be given as strings or as macros.
778 If you didn't use C<openlog()> before using C<syslog()>, C<syslog()> will
779 try to guess the C<$ident> by extracting the shortest prefix of
780 C<$format> that ends in a C<":">.
784 syslog("info", $message); # informational level
785 syslog(LOG_INFO, $message); # informational level
787 syslog("info|local0", $message); # information level, Local0 facility
788 syslog(LOG_INFO|LOG_LOCAL0, $message); # information level, Local0 facility
794 C<Sys::Syslog> version v0.07 and older passed the C<$message> as the
795 formatting string to C<sprintf()> even when no formatting arguments
796 were provided. If the code calling C<syslog()> might execute with
797 older versions of this module, make sure to call the function as
798 C<syslog($priority, "%s", $message)> instead of C<syslog($priority,
799 $message)>. This protects against hostile formatting sequences that
800 might show up if $message contains tainted data.
805 =item B<setlogmask($mask_priority)>
807 Sets the log mask for the current process to C<$mask_priority> and
808 returns the old mask. If the mask argument is 0, the current log mask
809 is not modified. See L<"Levels"> for the list of available levels.
810 You can use the C<LOG_UPTO()> function to allow all levels up to a
811 given priority (but it only accept the numeric macros as arguments).
817 setlogmask( LOG_MASK(LOG_ERR) );
819 Log everything except informational messages:
821 setlogmask( ~(LOG_MASK(LOG_INFO)) );
823 Log critical messages, errors and warnings:
825 setlogmask( LOG_MASK(LOG_CRIT) | LOG_MASK(LOG_ERR) | LOG_MASK(LOG_WARNING) );
827 Log all messages up to debug:
829 setlogmask( LOG_UPTO(LOG_DEBUG) );
832 =item B<setlogsock($sock_type)>
834 =item B<setlogsock($sock_type, $stream_location)> (added in 5.004_02)
836 Sets the socket type to be used for the next call to
837 C<openlog()> or C<syslog()> and returns true on success,
838 C<undef> on failure. The available mechanisms are:
844 C<"native"> - use the native C functions from your C<syslog(3)> library.
848 C<"tcp"> - connect to a TCP socket, on the C<syslog/tcp> or C<syslogng/tcp>
853 C<"udp"> - connect to a UDP socket, on the C<syslog/udp> service.
857 C<"inet"> - connect to an INET socket, either TCP or UDP, tried in that order.
861 C<"unix"> - connect to a UNIX domain socket (in some systems a character
862 special device). The name of that socket is the second parameter or, if
863 you omit the second parameter, the value returned by the C<_PATH_LOG> macro
864 (if your system defines it), or F</dev/log> or F</dev/conslog>, whatever is
869 C<"stream"> - connect to the stream indicated by the pathname provided as
870 the optional second parameter, or, if omitted, to F</dev/conslog>.
871 For example Solaris and IRIX system may prefer C<"stream"> instead of C<"unix">.
875 C<"console"> - send messages directly to the console, as for the C<"cons">
876 option of C<openlog()>.
880 A reference to an array can also be passed as the first parameter.
881 When this calling method is used, the array should contain a list of
882 mechanisms which are attempted in order.
884 The default is to try C<native>, C<tcp>, C<udp>, C<unix>, C<stream>, C<console>.
886 Giving an invalid value for C<$sock_type> will croak.
890 Select the UDP socket mechanism:
894 Select the native, UDP socket then UNIX domain socket mechanisms:
896 setlogsock(["native", "udp", "unix"]);
901 Closes the log file and returns true on success.
908 openlog($program, 'cons,pid', 'user');
909 syslog('info', '%s', 'this is another test');
910 syslog('mail|warning', 'this is a better test: %d', time);
913 syslog('debug', 'this is the last test');
916 openlog("$program $$", 'ndelay', 'user');
917 syslog('notice', 'fooprogram: this is really done');
921 syslog('info', 'problem was %m'); # %m == $! in syslog(3)
923 Log to UDP port on C<$remotehost> instead of logging locally:
926 $Sys::Syslog::host = $remotehost;
927 openlog($program, 'ndelay', 'user');
928 syslog('info', 'something happened over here');
939 C<LOG_AUTH> - security/authorization messages
943 C<LOG_AUTHPRIV> - security/authorization messages (private)
947 C<LOG_CRON> - clock daemons (B<cron> and B<at>)
951 C<LOG_DAEMON> - system daemons without separate facility value
955 C<LOG_FTP> - FTP daemon
959 C<LOG_KERN> - kernel messages
963 C<LOG_INSTALL> - installer subsystem
967 C<LOG_LAUNCHD> - launchd - general bootstrap daemon (Mac OS X)
971 C<LOG_LOCAL0> through C<LOG_LOCAL7> - reserved for local use
975 C<LOG_LPR> - line printer subsystem
979 C<LOG_MAIL> - mail subsystem
983 C<LOG_NETINFO> - NetInfo subsystem (Mac OS X)
987 C<LOG_NEWS> - USENET news subsystem
991 C<LOG_RAS> - Remote Access Service (VPN / PPP) (Mac OS X)
995 C<LOG_REMOTEAUTH> - remote authentication/authorization (Mac OS X)
999 C<LOG_SYSLOG> - messages generated internally by B<syslogd>
1003 C<LOG_USER> (default) - generic user-level messages
1007 C<LOG_UUCP> - UUCP subsystem
1018 C<LOG_EMERG> - system is unusable
1022 C<LOG_ALERT> - action must be taken immediately
1026 C<LOG_CRIT> - critical conditions
1030 C<LOG_ERR> - error conditions
1034 C<LOG_WARNING> - warning conditions
1038 C<LOG_NOTICE> - normal, but significant, condition
1042 C<LOG_INFO> - informational message
1046 C<LOG_DEBUG> - debug-level message
1055 =item Invalid argument passed to setlogsock
1057 B<(F)> You gave C<setlogsock()> an invalid value for C<$sock_type>.
1059 =item no connection to syslog available
1061 B<(F)> C<syslog()> failed to connect to the specified socket.
1063 =item stream passed to setlogsock, but %s is not writable
1065 B<(W)> You asked C<setlogsock()> to use a stream socket, but the given
1066 path is not writable.
1068 =item stream passed to setlogsock, but could not find any device
1070 B<(W)> You asked C<setlogsock()> to use a stream socket, but didn't
1071 provide a path, and C<Sys::Syslog> was unable to find an appropriate one.
1073 =item tcp passed to setlogsock, but tcp service unavailable
1075 B<(W)> You asked C<setlogsock()> to use a TCP socket, but the service
1076 is not available on the system.
1078 =item syslog: expecting argument %s
1080 B<(F)> You forgot to give C<syslog()> the indicated argument.
1082 =item syslog: invalid level/facility: %s
1084 B<(F)> You specified an invalid level or facility.
1086 =item syslog: too many levels given: %s
1088 B<(F)> You specified too many levels.
1090 =item syslog: too many facilities given: %s
1092 B<(F)> You specified too many facilities.
1094 =item syslog: level must be given
1096 B<(F)> You forgot to specify a level.
1098 =item udp passed to setlogsock, but udp service unavailable
1100 B<(W)> You asked C<setlogsock()> to use a UDP socket, but the service
1101 is not available on the system.
1103 =item unix passed to setlogsock, but path not available
1105 B<(W)> You asked C<setlogsock()> to use a UNIX socket, but C<Sys::Syslog>
1106 was unable to find an appropriate an appropriate device.
1115 SUSv3 issue 6, IEEE Std 1003.1, 2004 edition,
1116 L<http://www.opengroup.org/onlinepubs/000095399/basedefs/syslog.h.html>
1118 GNU C Library documentation on syslog,
1119 L<http://www.gnu.org/software/libc/manual/html_node/Syslog.html>
1121 Solaris 10 documentation on syslog,
1122 L<http://docs.sun.com/app/docs/doc/816-5168/6mbb3hruo?a=view>
1124 AIX 5L 5.3 documentation on syslog,
1125 L<http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.doc/libs/basetrf2/syslog.htm>
1127 HP-UX 11i documentation on syslog,
1128 L<http://docs.hp.com/en/B9106-90010/syslog.3C.html>
1130 Tru64 5.1 documentation on syslog,
1131 L<http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/V51_HTML/MAN/MAN3/0193____.HTM>
1134 L<http://stratadoc.stratus.com/vos/15.1.1/r502-01/wwhelp/wwhimpl/js/html/wwhelp.htm?context=r502-01&file=ch5r502-01bi.html>
1136 I<RFC 3164 - The BSD syslog Protocol>, L<http://www.faqs.org/rfcs/rfc3164.html>
1137 -- Please note that this is an informational RFC, and therefore does not
1138 specify a standard of any kind.
1140 I<RFC 3195 - Reliable Delivery for syslog>, L<http://www.faqs.org/rfcs/rfc3195.html>
1142 I<Syslogging with Perl>, L<http://lexington.pm.org/meetings/022001.html>
1147 Tom Christiansen E<lt>F<tchrist@perl.com>E<gt> and Larry Wall
1148 E<lt>F<larry@wall.org>E<gt>.
1150 UNIX domain sockets added by Sean Robinson
1151 E<lt>F<robinson_s@sc.maricopa.edu>E<gt> with support from Tim Bunce
1152 E<lt>F<Tim.Bunce@ig.co.uk>E<gt> and the C<perl5-porters> mailing list.
1154 Dependency on F<syslog.ph> replaced with XS code by Tom Hughes
1155 E<lt>F<tom@compton.nu>E<gt>.
1157 Code for C<constant()>s regenerated by Nicholas Clark E<lt>F<nick@ccl4.org>E<gt>.
1159 Failover to different communication modes by Nick Williams
1160 E<lt>F<Nick.Williams@morganstanley.com>E<gt>.
1162 XS code for using native C functions borrowed from C<L<Unix::Syslog>>,
1163 written by Marcus Harnisch E<lt>F<marcus.harnisch@gmx.net>E<gt>.
1165 Extracted from core distribution for publishing on the CPAN by
1166 SE<eacute>bastien Aperghis-Tramoni E<lt>sebastien@aperghis.netE<gt>.
1171 Please report any bugs or feature requests to
1172 C<bug-sys-syslog at rt.cpan.org>, or through the web interface at
1173 L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Sys-Syslog>.
1174 I will be notified, and then you'll automatically be notified of progress on
1175 your bug as I make changes.
1180 You can find documentation for this module with the perldoc command.
1184 You can also look for information at:
1188 =item * AnnoCPAN: Annotated CPAN documentation
1190 L<http://annocpan.org/dist/Sys-Syslog>
1192 =item * CPAN Ratings
1194 L<http://cpanratings.perl.org/d/Sys-Syslog>
1196 =item * RT: CPAN's request tracker
1198 L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Sys-Syslog>
1202 L<http://search.cpan.org/dist/Sys-Syslog/>
1204 =item * Kobes' CPAN Search
1206 L<http://cpan.uwinnipeg.ca/dist/Sys-Syslog>
1208 =item * Perl Documentation
1210 L<http://perldoc.perl.org/Sys/Syslog.html>
1217 This program is free software; you can redistribute it and/or modify it
1218 under the same terms as Perl itself.