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cpan/Sys-Syslog/Syslog.pm  view on Meta::CPAN

EVENTLOG: {
    my $verbose_if_Win32 = $^O =~ /Win32/i;

    if (can_load_sys_syslog_win32($verbose_if_Win32)) {
        unshift @connectMethods, 'eventlog';
    }
}

my @defaultMethods = @connectMethods;
my @fallbackMethods = ();

# The timeout in connection_ok() was pushed up to 0.25 sec in 
# Sys::Syslog v0.19 in order to address a heisenbug on MacOSX:
# http://london.pm.org/pipermail/london.pm/Week-of-Mon-20061211/005961.html
# 
# However, this also had the effect of slowing this test for 
# all other operating systems, which apparently impacted some 
# users (cf. CPAN-RT #34753). So, in order to make everybody 
# happy, the timeout is now zero by default on all systems 
# except on OSX where it is set to 250 msec, and can be set 
# with the infamous setlogsock() function.
#
# Update 2011-08: this issue is also been seen on multiprocessor
# Debian GNU/kFreeBSD systems. See http://bugs.debian.org/627821
# and https://rt.cpan.org/Ticket/Display.html?id=69997
# Also, lowering the delay to 1 ms, which should be enough.

$sock_timeout = 0.001 if $^O =~ /darwin|gnukfreebsd/;


# Perl 5.6.0's warnings.pm doesn't have warnings::warnif()
if (not defined &warnings::warnif) {
    *warnings::warnif = sub {
        goto &warnings::warn if warnings::enabled(__PACKAGE__)
    }
}

# coderef for a nicer handling of errors
my $err_sub = $options{nofatal} ? \&warnings::warnif : \&croak;


sub AUTOLOAD {
    # This AUTOLOAD is used to 'autoload' constants from the constant()
    # XS function.
    no strict 'vars';
    my $constname;
    ($constname = $AUTOLOAD) =~ s/.*:://;
    croak "Sys::Syslog::constant() not defined" if $constname eq 'constant';
    my ($error, $val) = constant($constname);
    croak $error if $error;
    no strict 'refs';
    *$AUTOLOAD = sub { $val };
    goto &$AUTOLOAD;
}


sub openlog {
    ($ident, my $logopt, $facility) = @_;

    # default values
    $ident    ||= basename($0) || getlogin() || getpwuid($<) || 'syslog';
    $logopt   ||= '';
    $facility ||= LOG_USER();

    for my $opt (split /\b/, $logopt) {
        $options{$opt} = 1 if exists $options{$opt}
    }

    $err_sub = delete $options{nofatal} ? \&warnings::warnif : \&croak;
    return 1 unless $options{ndelay};
    connect_log();
} 

sub closelog {
    disconnect_log() if $connected;
    $options{$_} = 0 for keys %options;
    $facility = $ident = "";
    $connected = 0;
    return 1
} 

sub setlogmask {
    my $oldmask = $maskpri;
    $maskpri = shift unless $_[0] == 0;
    $oldmask;
}


my %mechanism = (
    console => {
        check   => sub { 1 },
    },
    eventlog => {
        check   => sub { return can_load_sys_syslog_win32() },
        err_msg => "no Win32 API available",
    },
    inet => {
        check   => sub { 1 },
    },
    native => {
        check   => sub { 1 },
    },
    pipe => {
        check   => sub {
            ($syslog_path) = grep { defined && length && -p && -w _ }
                                $syslog_path, &_PATH_LOG, "/dev/log";
            return $syslog_path ? 1 : 0
        },
        err_msg => "path not available",
    },
    stream => {
        check   => sub {
            if (not defined $syslog_path) {
                my @try = qw(/dev/log /dev/conslog);
                unshift @try, &_PATH_LOG  if length &_PATH_LOG;
                ($syslog_path) = grep { -w } @try;
            }
            return defined $syslog_path && -w $syslog_path
        },
        err_msg => "could not find any writable device",
    },