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Van de Bugger
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NAME

Systemd::Daemon::XS - Perl bindings to libsystemd.

VERSION

Version 0.07, released on 2015-11-12 13:35 UTC.

SYNOPSIS

    use Systemd::Daemon::XS qw{ :all };

    sd_notify( 0, "READY=1\nSTATUS=Ready\n" );
    sd_pid_notify( $pid, 0, "RELOADING=1" );
    if ( sd_booted() ) {
        ...;
    };
    ...;

DESCRIPTION

This module provides Perl bindings to the part of libsystemd shared library declared in <systemd/sd-daemon.h> header.

EXPORT

The module exports nothing by default. You have to specify symbols to import explicitly:

    # Import function sd_listen_fds and constant $SD_LISTEN_FDS_START:
    use Systemd::Daemon::XS qw{ sd_listen_fds $SD_LISTEN_FDS_START };

or use tags to import groups of related symbols:

    # The same as as above:
    use Systemd::Daemon::XS qw{ :sd_listen };

Either colon (:) or dash (-) can be used as tag prefix:

    # Ditto:
    use Systemd::Daemon::XS qw{ -sd_listen };

The module uses Exporter::Tiny to export symbols, so all advanced import features like renaming symbols, importing to another package, to a hash, by regexp, etc, can be used:

    use Systemd::Daemon::XS '$SD_ERR' => { -as => 'ERR' }, '$SD_DEBUG' => { -as => 'DBG' };
    use Systemd::Daemon::XS qw{ -all !sd_notify };

See tips and tricks.

Tags

The module defines following export tags (all tag is not listed):

sd_booted

sd_booted.

sd_is

sd_is_fifo, sd_is_mq, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix, sd_is_special.

sd_listen

$SD_LISTEN_FDS_START, sd_listen_fds.

sd_log

$SD_ALERT, $SD_CRIT, $SD_DEBUG, $SD_EMERG, $SD_ERR, $SD_INFO, $SD_NOTICE, $SD_WARNING.

sd_notify

sd_notify, sd_pid_notify.

sd

All above.

CONSTANTS

Constants described below are not traditional 0-ary functions created by constant pragma, but immutable variables created by Readonly module, so you have to use sigils but can interpolate constants to strings.

$SD_ALERT

$SD_CRIT

$SD_DEBUG

$SD_EMERG

$SD_ERR

$SD_INFO

$SD_NOTICE

$SD_WARNING

See sd-daemon(3).

$SD_LISTEN_FDS_START

See sd_listen_fds(3).

FUNCTIONS

sd_listen_fds

    int sd_listen_fds( int unset_environment );

See sd_listen_fds(3).

sd_notify

sd_notifyf

sd_pid_notify

sd_pid_notify_with_fds

sd_pid_notifyf

    int sd_notify( int unset_environment, const char * state );
    // int sd_notifyf( int unset_environment, const char * format, ... );
    int sd_pid_notify( pid_t pid, int unset_environment, const char * state );
    // int sd_pid_notify_with_fds( pid_t pid, int unset_environment, const char * state, const int * fds, unsigned n_fds );
    // int sd_pid_notifyf( int pid, int unset_environment, const char * format, ... );

See sd_notify(3) for details.

The binding for sd_pid_notify_with_fds function is not yet implemented.

The bindings for sd_notifyf and sd_pid_notifyf will not be implemented likely. These printf-like functions accept format string and variable argument list. They are quite convenient in C, but in Perl they do not have much value — they may be easily replaced either by string interpolation and/or by using sprintf function, e. g.:

    sd_notify( 0, "STATUS=Done $percent\%.\n" );
    sd_notify( 0, sprintf( "STATUS=Done %03d\%.\n", $percent ) );

Also, it can be reimplemented in Perl:

    sub sd_notifyf($$@) {
        return sd_notify( shift( @_ ), sprintf( @_ ) );
    }

Such implementation is not included into Systemd::Daemon::XS because it is not a binding to libsystemd.

sd_booted

    int sd_booted();

See sd_booted(3).

sd_is_fifo

sd_is_mq

sd_is_socket

sd_is_socket_inet

sd_is_socket_unix

sd_is_special

    int sd_is_fifo( int fd, const char * path );
    int sd_is_mq( int fd, const char * path );
    int sd_is_socket( int fd, int family, int type, int listening );
    int sd_is_socket_inet( int fd, int family, int type, int listening, uint16_t port );
    int sd_is_socket_unix( int fd, int family, int type, int listening, const char * path, size_t length );
    int sd_is_special( int fd, const char * path );

See sd_is_fifo(3).

sd_watchdog_enabled

    // int sd_watchdog_enabled( int unset_environment, uint64_t * usec );

See sd_watchdog_enabled(3).

The binding for sd_watchdog_enabled function is not yet implemented.

SEE ALSO

AUTHOR

Van de Bugger <van.de.bugger@gmail.com>

COPYRIGHT AND LICENSE

Copyright (C) 2015 Van de Bugger

License GPLv3+: The GNU General Public License version 3 or later <http://www.gnu.org/licenses/gpl-3.0.txt>.

This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.