Полезная информация


Sys::Syslog, openlog, closelog, setlogmask, syslog - Perl interface to the UNIX syslog(3) calls


    use Sys::Syslog;                          # all except setlogsock, or:
    use Sys::Syslog qw(:DEFAULT setlogsock);  # default set, plus setlogsock

    setlogsock $sock_type;
    openlog $ident, $logopt, $facility;
    syslog $priority, $format, @args;
    $oldmask = setlogmask $mask_priority;


Sys::Syslog is an interface to the UNIX syslog(3) program. Call syslog() with a string priority and a list of printf() args just like syslog(3).

Syslog provides the functions:

openlog $ident, $logopt, $facility

$ident is prepended to every message. $logopt contains zero or more of the words pid, ndelay, cons, nowait. $facility specifies the part of the system

syslog $priority, $format, @args

If $priority permits, logs ($format, @args) printed as by printf(3V), with the addition that %m is replaced with "$!" (the latest error message).

setlogmask $mask_priority

Sets log mask $mask_priority and returns the old mask.

setlogsock $sock_type (added in 5.004_02)

Sets the socket type to be used for the next call to openlog() or syslog() and returns TRUE on success, undef on failure.

A value of 'unix' will connect to the UNIX domain socket returned by _PATH_LOG in syslog.ph. A value of 'inet' will connect to an INET socket returned by getservbyname(). Any other value croaks.

The default is for the INET socket to be used.


Closes the log file.

Note that openlog now takes three arguments, just like openlog(3).


    openlog($program, 'cons,pid', 'user');
    syslog('info', 'this is another test');
    syslog('mail|warning', 'this is a better test: %d', time);

    syslog('debug', 'this is the last test');

    openlog("$program $$", 'ndelay', 'user');
    syslog('notice', 'fooprogram: this is really done');

    $! = 55;
    syslog('info', 'problem was %m'); # %m == $! in syslog(3)


Sys::Syslog needs syslog.ph, which can be created with h2ph.




Tom Christiansen <tchrist@perl.com> and Larry Wall <larry@wall.org>. UNIX domain sockets added by Sean Robinson <robinson_s@sc.maricopa.edu> with support from Tim Bunce <Tim.Bunce@ig.co.uk> and the perl5-porters mailing list.


We are painfully aware that these documents may contain incorrect links and misformatted HTML. Such bugs lie in the automatic translation process that automatically created the hundreds and hundreds of separate documents that you find here. Please do not report link or formatting bugs, because we cannot fix per-document problems. The only bug reports that will help us are those that supply working patches to the installhtml or pod2html programs, or to the Pod::HTML module itself, for which I and the entire Perl community will shower you with thanks and praises.

If rather than formatting bugs, you encounter substantive content errors in these documents, such as mistakes in the explanations or code, please use the perlbug utility included with the Perl distribution.

--Tom Christiansen, Perl Documentation Compiler and Editor

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