syslog --- Unix syslog 函式庫例程

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This module provides an interface to the Unix syslog library routines. Refer to the Unix manual pages for a detailed description of the syslog facility.

Availability: Unix, not Emscripten, not WASI.

This module wraps the system syslog family of routines. A pure Python library that can speak to a syslog server is available in the logging.handlers module as SysLogHandler.

該模組定義了以下函式：

syslog.syslog(message)

syslog.syslog(priority, message)

Send the string message to the system logger. A trailing newline is added if necessary. Each message is tagged with a priority composed of a facility and a level. The optional priority argument, which defaults to LOG_INFO, determines the message priority. If the facility is not encoded in priority using logical-or (LOG_INFO | LOG_USER), the value given in the openlog() call is used.

If openlog() has not been called prior to the call to syslog(), openlog() will be called with no arguments.

引發一個附帶引數 priority、message 的稽核事件 syslog.syslog。

在 3.2 版的變更: In previous versions, openlog() would not be called automatically if it wasn't called prior to the call to syslog(), deferring to the syslog implementation to call openlog().

在 3.12 版的變更: This function is restricted in subinterpreters. (Only code that runs in multiple interpreters is affected and the restriction is not relevant for most users.) openlog() must be called in the main interpreter before syslog() may be used in a subinterpreter. Otherwise it will raise RuntimeError.

syslog.openlog([ident[, logoption[, facility]]])

Logging options of subsequent syslog() calls can be set by calling openlog(). syslog() will call openlog() with no arguments if the log is not currently open.

The optional ident keyword argument is a string which is prepended to every message, and defaults to sys.argv[0] with leading path components stripped. The optional logoption keyword argument (default is 0) is a bit field -- see below for possible values to combine. The optional facility keyword argument (default is LOG_USER) sets the default facility for messages which do not have a facility explicitly encoded.

引發一個附帶引數 ident、logoption、facility 的稽核事件 syslog.openlog。

在 3.2 版的變更: In previous versions, keyword arguments were not allowed, and ident was required.

在 3.12 版的變更: This function is restricted in subinterpreters. (Only code that runs in multiple interpreters is affected and the restriction is not relevant for most users.) This may only be called in the main interpreter. It will raise RuntimeError if called in a subinterpreter.

syslog.closelog()

Reset the syslog module values and call the system library closelog().

This causes the module to behave as it does when initially imported. For example, openlog() will be called on the first syslog() call (if openlog() hasn't already been called), and ident and other openlog() parameters are reset to defaults.

引發一個不附帶引數的稽核事件 syslog.closelog。

在 3.12 版的變更: This function is restricted in subinterpreters. (Only code that runs in multiple interpreters is affected and the restriction is not relevant for most users.) This may only be called in the main interpreter. It will raise RuntimeError if called in a subinterpreter.

syslog.setlogmask(maskpri)

Set the priority mask to maskpri and return the previous mask value. Calls to syslog() with a priority level not set in maskpri are ignored. The default is to log all priorities. The function LOG_MASK(pri) calculates the mask for the individual priority pri. The function LOG_UPTO(pri) calculates the mask for all priorities up to and including pri.

引發一個附帶引數 maskpri 的稽核事件 syslog.setlogmask。

The module defines the following constants:

Priority levels (high to low):

LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG.

Facilities:

LOG_KERN, LOG_USER, LOG_MAIL, LOG_DAEMON, LOG_AUTH, LOG_LPR, LOG_NEWS, LOG_UUCP, LOG_CRON, LOG_SYSLOG, LOG_LOCAL0 to LOG_LOCAL7, and, if defined in <syslog.h>, LOG_AUTHPRIV.

Log options:

LOG_PID, LOG_CONS, LOG_NDELAY, and, if defined in <syslog.h>, LOG_ODELAY, LOG_NOWAIT, and LOG_PERROR.

範例

簡單範例

一組簡單範例：

import syslog

syslog.syslog('Processing started')
if error:
    syslog.syslog(syslog.LOG_ERR, 'Processing started')

An example of setting some log options, these would include the process ID in logged messages, and write the messages to the destination facility used for mail logging:

syslog.openlog(logoption=syslog.LOG_PID, facility=syslog.LOG_MAIL)
syslog.syslog('E-mail processing initiated...')