module SystemD

Overview

Wrapper for libsystemd http://man7.org/linux/man-pages/man3/sd_pid_notify_with_fds.3.html http://man7.org/linux/man-pages/man3/sd_listen_fds_with_names.3.html

Defined in:

memory_pressure.cr
systemd.cr

Constant Summary

LISTEN_FDS_START = 3

Class Method Summary

• .is_listening?(fd)
• .is_socket?(fd : Int, family : Socket::Family, type : Socket::Type, listening : Int) : Bool

  Checks if a FD refers to a socket of the specified type https://www.man7.org/linux/man-pages/man3/sd_is_socket_unix.3.html

• .is_tcp_listener?(fd : Int)
• .is_tcp_socket?(fd : Int)
• .is_udp_listener?(fd : Int)
• .is_udp_socket?(fd : Int)
• .is_unix_dgram_listener?(fd : Int)
• .is_unix_dgram_socket?(fd : Int)
• .is_unix_stream_listener?(fd : Int)
• .is_unix_stream_socket?(fd : Int)
• .listen_fds : Indexable(Int32)
• .listen_fds_with_names : Indexable(Tuple(Int32, String))
• .listeners : Indexable(Socket)
• .listening_socket?(fd : Int)
• .named_listeners : Indexable(Tuple(Socket, String))
• .notify(message = "READY=1\n") : Bool
• .notify_ready
• .notify_reloading
• .notify_status(status : String)
• .notify_stopping
• .remove_fds(name : String)
• .store_fds(fds : Array(Int32), name : String) : Bool
• .store_fds(fds : Array(Int32)) : Bool
• .tcp_socket?(fd : Int)
• .udp_socket?(fd : Int)
• .unix_dgram_socket?(fd : Int)
• .unix_stream_socket?(fd : Int)
• .watchdog(&callback : -> _)

  Report to systemd in a separate fiber The callback should return a trueish value or else the keepalive won't be sent If systemd doesn't get a ping every WATCHDOG_USEC it will kill the process.

• .watchdog
• .watchdog_interval? : Time::Span | Nil

Class Method Detail