Package syslog

• import "log/syslog"
• Overview
• Index
• Examples

Overview

Package syslog provides a simple interface to the system log service. It can send messages to the syslog daemon using UNIX domain sockets, UDP or TCP.

Only one call to Dial is necessary. On write failures, the syslog client will attempt to reconnect to the server and write again.

The syslog package is frozen and is not accepting new features. Some external packages provide more functionality. See:

https://godoc.org/?q=syslog

Index

• func NewLogger(p Priority, logFlag int) (*log.Logger, error)
• type Priority
• type Writer
• func Dial(network, raddr string, priority Priority, tag string) (*Writer, error)
• func New(priority Priority, tag string) (*Writer, error)
• func (w *Writer) Alert(m string) error
• func (w *Writer) Close() error
• func (w *Writer) Crit(m string) error
• func (w *Writer) Debug(m string) error
• func (w *Writer) Emerg(m string) error
• func (w *Writer) Err(m string) error
• func (w *Writer) Info(m string) error
• func (w *Writer) Notice(m string) error
• func (w *Writer) Warning(m string) error
• func (w *Writer) Write(b []byte) (int, error)
• Bugs

Package files

doc.go syslog.go syslog_unix.go

func NewLogger

func NewLogger(p Priority, logFlag int) (*log.Logger, error)

NewLogger creates a log.Logger whose output is written to the system log service with the specified priority, a combination of the syslog facility and severity. The logFlag argument is the flag set passed through to log.New to create the Logger.

type Priority

The Priority is a combination of the syslog facility and severity. For example, LOG_ALERT | LOG_FTP sends an alert severity message from the FTP facility. The default severity is LOG_EMERG; the default facility is LOG_KERN.

type Priority int

const (

    // From /usr/include/sys/syslog.h.
    // These are the same on Linux, BSD, and OS X.
    LOG_EMERG Priority = iota
    LOG_ALERT
    LOG_CRIT
    LOG_ERR
    LOG_WARNING
    LOG_NOTICE
    LOG_INFO
    LOG_DEBUG
)

const (

    // From /usr/include/sys/syslog.h.
    // These are the same up to LOG_FTP on Linux, BSD, and OS X.
    LOG_KERN Priority = iota << 3
    LOG_USER
    LOG_MAIL
    LOG_DAEMON
    LOG_AUTH
    LOG_SYSLOG
    LOG_LPR
    LOG_NEWS
    LOG_UUCP
    LOG_CRON
    LOG_AUTHPRIV
    LOG_FTP

    LOG_LOCAL0
    LOG_LOCAL1
    LOG_LOCAL2
    LOG_LOCAL3
    LOG_LOCAL4
    LOG_LOCAL5
    LOG_LOCAL6
    LOG_LOCAL7
)

type Writer

A Writer is a connection to a syslog server.

type Writer struct {
    // contains filtered or unexported fields
}

func Dial

func Dial(network, raddr string, priority Priority, tag string) (*Writer, error)

Dial establishes a connection to a log daemon by connecting to address raddr on the specified network. Each write to the returned writer sends a log message with the facility and severity (from priority) and tag. If tag is empty, the os.Args[0] is used. If network is empty, Dial will connect to the local syslog server. Otherwise, see the documentation for net.Dial for valid values of network and raddr.

Example

Code:

sysLog, err := syslog.Dial("tcp", "localhost:1234",
    syslog.LOG_WARNING|syslog.LOG_DAEMON, "demotag")
if err != nil {
    log.Fatal(err)
}
fmt.Fprintf(sysLog, "This is a daemon warning with demotag.")
sysLog.Emerg("And this is a daemon emergency with demotag.")

func New

func New(priority Priority, tag string) (*Writer, error)

New establishes a new connection to the system log daemon. Each write to the returned writer sends a log message with the given priority (a combination of the syslog facility and severity) and prefix tag. If tag is empty, the os.Args[0] is used.

func (*Writer) Alert

func (w *Writer) Alert(m string) error

Alert logs a message with severity LOG_ALERT, ignoring the severity passed to New.

func (*Writer) Close

func (w *Writer) Close() error

Close closes a connection to the syslog daemon.

func (*Writer) Crit

func (w *Writer) Crit(m string) error

Crit logs a message with severity LOG_CRIT, ignoring the severity passed to New.

func (*Writer) Debug

func (w *Writer) Debug(m string) error

Debug logs a message with severity LOG_DEBUG, ignoring the severity passed to New.

func (*Writer) Emerg

func (w *Writer) Emerg(m string) error

Emerg logs a message with severity LOG_EMERG, ignoring the severity passed to New.

func (*Writer) Err

func (w *Writer) Err(m string) error

Err logs a message with severity LOG_ERR, ignoring the severity passed to New.

func (*Writer) Info

func (w *Writer) Info(m string) error

Info logs a message with severity LOG_INFO, ignoring the severity passed to New.

func (*Writer) Notice

func (w *Writer) Notice(m string) error

Notice logs a message with severity LOG_NOTICE, ignoring the severity passed to New.

func (*Writer) Warning

func (w *Writer) Warning(m string) error

Warning logs a message with severity LOG_WARNING, ignoring the severity passed to New.

func (*Writer) Write

func (w *Writer) Write(b []byte) (int, error)

Write sends a log message to the syslog daemon.

Bugs

• ☞

  This package is not implemented on Windows. As the syslog package is frozen, Windows users are encouraged to use a package outside of the standard library. For background, see https://golang.org/issue/1108.

• ☞

  This package is not implemented on Plan 9.