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814 lines
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<title>log - The Go Programming Language</title>
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<div id="topbar" class="wide"><div class="container">
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<div class="top-heading" id="heading-wide"><a href="http://localhost:6060/">The Go Programming Language</a></div>
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<h1>Package log</h1>
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<!--
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file.
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-->
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Note: Static (i.e., not template-generated) href and id
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</script>
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<div id="short-nav">
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<dl>
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<dd><code>import "log"</code></dd>
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</dl>
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<dl>
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<dd><a href="index.html#pkg-overview" class="overviewLink">Overview</a></dd>
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<dd><a href="index.html#pkg-index" class="indexLink">Index</a></dd>
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<dd><a href="index.html#pkg-examples" class="examplesLink">Examples</a></dd>
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<dd><a href="index.html#pkg-subdirectories">Subdirectories</a></dd>
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</dl>
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<!-- The package's Name is printed as title by the top-level template -->
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<div id="pkg-overview" class="toggleVisible">
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<h2 class="toggleButton" title="Click to show Overview section">Overview ▹</h2>
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</div>
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Overview section">Overview ▾</h2>
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<p>
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Package log implements a simple logging package. It defines a type, Logger,
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with methods for formatting output. It also has a predefined 'standard'
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Logger accessible through helper functions Print[f|ln], Fatal[f|ln], and
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Panic[f|ln], which are easier to use than creating a Logger manually.
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That logger writes to standard error and prints the date and time
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of each logged message.
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The Fatal functions call os.Exit(1) after writing the log message.
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The Panic functions call panic after writing the log message.
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</p>
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</div>
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</div>
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<h2 class="toggleButton" title="Click to show Index section">Index ▹</h2>
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Index section">Index ▾</h2>
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<!-- Table of contents for API; must be named manual-nav to turn off auto nav. -->
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<div id="manual-nav">
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<dl>
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<dd><a href="index.html#pkg-constants">Constants</a></dd>
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<dd><a href="index.html#Fatal">func Fatal(v ...interface{})</a></dd>
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<dd><a href="index.html#Fatalf">func Fatalf(format string, v ...interface{})</a></dd>
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<dd><a href="index.html#Fatalln">func Fatalln(v ...interface{})</a></dd>
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<dd><a href="index.html#Flags">func Flags() int</a></dd>
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<dd><a href="index.html#Output">func Output(calldepth int, s string) error</a></dd>
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<dd><a href="index.html#Panic">func Panic(v ...interface{})</a></dd>
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<dd><a href="index.html#Panicf">func Panicf(format string, v ...interface{})</a></dd>
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<dd><a href="index.html#Panicln">func Panicln(v ...interface{})</a></dd>
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<dd><a href="index.html#Prefix">func Prefix() string</a></dd>
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<dd><a href="index.html#Print">func Print(v ...interface{})</a></dd>
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<dd><a href="index.html#Printf">func Printf(format string, v ...interface{})</a></dd>
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<dd><a href="index.html#Println">func Println(v ...interface{})</a></dd>
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<dd><a href="index.html#SetFlags">func SetFlags(flag int)</a></dd>
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<dd><a href="index.html#SetOutput">func SetOutput(w io.Writer)</a></dd>
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<dd><a href="index.html#SetPrefix">func SetPrefix(prefix string)</a></dd>
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<dd><a href="index.html#Logger">type Logger</a></dd>
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<dd> <a href="index.html#New">func New(out io.Writer, prefix string, flag int) *Logger</a></dd>
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<dd> <a href="index.html#Logger.Fatal">func (l *Logger) Fatal(v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.Fatalf">func (l *Logger) Fatalf(format string, v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.Fatalln">func (l *Logger) Fatalln(v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.Flags">func (l *Logger) Flags() int</a></dd>
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<dd> <a href="index.html#Logger.Output">func (l *Logger) Output(calldepth int, s string) error</a></dd>
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<dd> <a href="index.html#Logger.Panic">func (l *Logger) Panic(v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.Panicf">func (l *Logger) Panicf(format string, v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.Panicln">func (l *Logger) Panicln(v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.Prefix">func (l *Logger) Prefix() string</a></dd>
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<dd> <a href="index.html#Logger.Print">func (l *Logger) Print(v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.Printf">func (l *Logger) Printf(format string, v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.Println">func (l *Logger) Println(v ...interface{})</a></dd>
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<dd> <a href="index.html#Logger.SetFlags">func (l *Logger) SetFlags(flag int)</a></dd>
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<dd> <a href="index.html#Logger.SetOutput">func (l *Logger) SetOutput(w io.Writer)</a></dd>
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<dd> <a href="index.html#Logger.SetPrefix">func (l *Logger) SetPrefix(prefix string)</a></dd>
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</dl>
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</div><!-- #manual-nav -->
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<div id="pkg-examples">
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<h4>Examples</h4>
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<dl>
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<dd><a class="exampleLink" href="index.html#example_Logger">Logger</a></dd>
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</dl>
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</div>
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<h4>Package files</h4>
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<p>
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<span style="font-size:90%">
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<a href="http://localhost:6060/src/log/log.go">log.go</a>
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</span>
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</p>
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</div><!-- .expanded -->
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</div><!-- #pkg-index -->
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<div id="pkg-callgraph" class="toggle" style="display: none">
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<div class="collapsed">
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<h2 class="toggleButton" title="Click to show Internal Call Graph section">Internal call graph ▹</h2>
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</div> <!-- .expanded -->
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Internal Call Graph section">Internal call graph ▾</h2>
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<p>
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In the call graph viewer below, each node
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is a function belonging to this package
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and its children are the functions it
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calls—perhaps dynamically.
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</p>
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<p>
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The root nodes are the entry points of the
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package: functions that may be called from
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outside the package.
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There may be non-exported or anonymous
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functions among them if they are called
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dynamically from another package.
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</p>
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<p>
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Click a node to visit that function's source code.
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From there you can visit its callers by
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clicking its declaring <code>func</code>
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token.
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</p>
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<p>
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Functions may be omitted if they were
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determined to be unreachable in the
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particular programs or tests that were
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analyzed.
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</p>
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<!-- Zero means show all package entry points. -->
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<ul style="margin-left: 0.5in" id="callgraph-0" class="treeview"></ul>
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</div>
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</div> <!-- #pkg-callgraph -->
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<h2 id="pkg-constants">Constants</h2>
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<pre>const (
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<span class="comment">// Bits or'ed together to control what's printed.</span>
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<span class="comment">// There is no control over the order they appear (the order listed</span>
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<span class="comment">// here) or the format they present (as described in the comments).</span>
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<span class="comment">// The prefix is followed by a colon only when Llongfile or Lshortfile</span>
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<span class="comment">// is specified.</span>
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<span class="comment">// For example, flags Ldate | Ltime (or LstdFlags) produce,</span>
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<span class="comment">// 2009/01/23 01:23:23 message</span>
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<span class="comment">// while flags Ldate | Ltime | Lmicroseconds | Llongfile produce,</span>
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<span class="comment">// 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message</span>
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<span id="Ldate">Ldate</span> = 1 << <a href="../builtin/index.html#iota">iota</a> <span class="comment">// the date in the local time zone: 2009/01/23</span>
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<span id="Ltime">Ltime</span> <span class="comment">// the time in the local time zone: 01:23:23</span>
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<span id="Lmicroseconds">Lmicroseconds</span> <span class="comment">// microsecond resolution: 01:23:23.123123. assumes Ltime.</span>
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<span id="Llongfile">Llongfile</span> <span class="comment">// full file name and line number: /a/b/c/d.go:23</span>
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<span id="Lshortfile">Lshortfile</span> <span class="comment">// final file name element and line number: d.go:23. overrides Llongfile</span>
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<span id="LUTC">LUTC</span> <span class="comment">// if Ldate or Ltime is set, use UTC rather than the local time zone</span>
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<span id="LstdFlags">LstdFlags</span> = <a href="index.html#Ldate">Ldate</a> | <a href="index.html#Ltime">Ltime</a> <span class="comment">// initial values for the standard logger</span>
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)</pre>
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<p>
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These flags define which text to prefix to each log entry generated by the Logger.
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</p>
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<h2 id="Fatal">func <a href="http://localhost:6060/src/log/log.go?s=8938:8966#L289">Fatal</a></h2>
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<pre>func Fatal(v ...interface{})</pre>
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<p>
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Fatal is equivalent to Print() followed by a call to os.Exit(1).
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</p>
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<h2 id="Fatalf">func <a href="http://localhost:6060/src/log/log.go?s=9087:9131#L295">Fatalf</a></h2>
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<pre>func Fatalf(format <a href="../builtin/index.html#string">string</a>, v ...interface{})</pre>
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<p>
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Fatalf is equivalent to Printf() followed by a call to os.Exit(1).
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</p>
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<h2 id="Fatalln">func <a href="http://localhost:6060/src/log/log.go?s=9263:9293#L301">Fatalln</a></h2>
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<pre>func Fatalln(v ...interface{})</pre>
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<p>
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Fatalln is equivalent to Println() followed by a call to os.Exit(1).
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</p>
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<h2 id="Flags">func <a href="http://localhost:6060/src/log/log.go?s=7883:7899#L249">Flags</a></h2>
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<pre>func Flags() <a href="../builtin/index.html#int">int</a></pre>
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<p>
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Flags returns the output flags for the standard logger.
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</p>
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<h2 id="Output">func <a href="http://localhost:6060/src/log/log.go?s=10268:10310#L334">Output</a></h2>
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<pre>func Output(calldepth <a href="../builtin/index.html#int">int</a>, s <a href="../builtin/index.html#string">string</a>) <a href="../builtin/index.html#error">error</a></pre>
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<p>
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Output writes the output for a logging event. The string s contains
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the text to print after the prefix specified by the flags of the
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Logger. A newline is appended if the last character of s is not
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already a newline. Calldepth is the count of the number of
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frames to skip when computing the file name and line number
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if Llongfile or Lshortfile is set; a value of 1 will print the details
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for the caller of Output.
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</p>
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<h2 id="Panic">func <a href="http://localhost:6060/src/log/log.go?s=9411:9439#L307">Panic</a></h2>
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<pre>func Panic(v ...interface{})</pre>
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<p>
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Panic is equivalent to Print() followed by a call to panic().
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</p>
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<h2 id="Panicf">func <a href="http://localhost:6060/src/log/log.go?s=9563:9607#L314">Panicf</a></h2>
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<pre>func Panicf(format <a href="../builtin/index.html#string">string</a>, v ...interface{})</pre>
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<p>
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Panicf is equivalent to Printf() followed by a call to panic().
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</p>
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<h2 id="Panicln">func <a href="http://localhost:6060/src/log/log.go?s=9742:9772#L321">Panicln</a></h2>
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<pre>func Panicln(v ...interface{})</pre>
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<p>
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Panicln is equivalent to Println() followed by a call to panic().
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</p>
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<h2 id="Prefix">func <a href="http://localhost:6060/src/log/log.go?s=8094:8114#L259">Prefix</a></h2>
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<pre>func Prefix() <a href="../builtin/index.html#string">string</a></pre>
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<p>
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Prefix returns the output prefix for the standard logger.
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</p>
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<h2 id="Print">func <a href="http://localhost:6060/src/log/log.go?s=8418:8446#L272">Print</a></h2>
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<pre>func Print(v ...interface{})</pre>
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<p>
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Print calls Output to print to the standard logger.
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Arguments are handled in the manner of fmt.Print.
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</p>
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<h2 id="Printf">func <a href="http://localhost:6060/src/log/log.go?s=8595:8639#L278">Printf</a></h2>
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<pre>func Printf(format <a href="../builtin/index.html#string">string</a>, v ...interface{})</pre>
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<p>
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Printf calls Output to print to the standard logger.
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Arguments are handled in the manner of fmt.Printf.
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</p>
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<h2 id="Println">func <a href="http://localhost:6060/src/log/log.go?s=8799:8829#L284">Println</a></h2>
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<pre>func Println(v ...interface{})</pre>
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<p>
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Println calls Output to print to the standard logger.
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Arguments are handled in the manner of fmt.Println.
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</p>
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<h2 id="SetFlags">func <a href="http://localhost:6060/src/log/log.go?s=7984:8007#L254">SetFlags</a></h2>
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<pre>func SetFlags(flag <a href="../builtin/index.html#int">int</a>)</pre>
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<p>
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SetFlags sets the output flags for the standard logger.
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</p>
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<h2 id="SetOutput">func <a href="http://localhost:6060/src/log/log.go?s=7740:7767#L242">SetOutput</a></h2>
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<pre>func SetOutput(w <a href="../io/index.html">io</a>.<a href="../io/index.html#Writer">Writer</a>)</pre>
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<p>
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SetOutput sets the output destination for the standard logger.
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</p>
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<h2 id="SetPrefix">func <a href="http://localhost:6060/src/log/log.go?s=8202:8231#L264">SetPrefix</a></h2>
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<pre>func SetPrefix(prefix <a href="../builtin/index.html#string">string</a>)</pre>
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<p>
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SetPrefix sets the output prefix for the standard logger.
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</p>
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<h2 id="Logger">type <a href="http://localhost:6060/src/log/log.go?s=2250:2542#L38">Logger</a></h2>
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<pre>type Logger struct {
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<span class="comment">// contains filtered or unexported fields</span>
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}</pre>
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<p>
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A Logger represents an active logging object that generates lines of
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output to an io.Writer. Each logging operation makes a single call to
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the Writer's Write method. A Logger can be used simultaneously from
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multiple goroutines; it guarantees to serialize access to the Writer.
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</p>
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<div id="example_Logger" class="toggle">
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<div class="collapsed">
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<p class="exampleHeading toggleButton">▹ <span class="text">Example</span></p>
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</div>
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<div class="expanded">
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<p class="exampleHeading toggleButton">▾ <span class="text">Example</span></p>
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<p>Code:</p>
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<pre class="code">var buf bytes.Buffer
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logger := log.New(&buf, "logger: ", log.Lshortfile)
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logger.Print("Hello, log file!")
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fmt.Print(&buf)
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<span class="comment"></pre>
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<p>Output:</p>
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<pre class="output">logger: example_test.go:16: Hello, log file!
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</pre>
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</div>
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</div>
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<h3 id="New">func <a href="http://localhost:6060/src/log/log.go?s=2771:2827#L50">New</a></h3>
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<pre>func New(out <a href="../io/index.html">io</a>.<a href="../io/index.html#Writer">Writer</a>, prefix <a href="../builtin/index.html#string">string</a>, flag <a href="../builtin/index.html#int">int</a>) *<a href="index.html#Logger">Logger</a></pre>
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<p>
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New creates a new Logger. The out variable sets the
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destination to which log data will be written.
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The prefix appears at the beginning of each generated log line.
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The flag argument defines the logging properties.
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</p>
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<h3 id="Logger.Fatal">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=6145:6185#L175">Fatal</a></h3>
|
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<pre>func (l *<a href="index.html#Logger">Logger</a>) Fatal(v ...interface{})</pre>
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<p>
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Fatal is equivalent to l.Print() followed by a call to os.Exit(1).
|
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</p>
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<h3 id="Logger.Fatalf">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=6306:6362#L181">Fatalf</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Fatalf(format <a href="../builtin/index.html#string">string</a>, v ...interface{})</pre>
|
|
<p>
|
|
Fatalf is equivalent to l.Printf() followed by a call to os.Exit(1).
|
|
</p>
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<h3 id="Logger.Fatalln">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=6494:6536#L187">Fatalln</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Fatalln(v ...interface{})</pre>
|
|
<p>
|
|
Fatalln is equivalent to l.Println() followed by a call to os.Exit(1).
|
|
</p>
|
|
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<h3 id="Logger.Flags">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=7158:7186#L214">Flags</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Flags() <a href="../builtin/index.html#int">int</a></pre>
|
|
<p>
|
|
Flags returns the output flags for the logger.
|
|
</p>
|
|
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|
|
<h3 id="Logger.Output">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=4899:4953#L133">Output</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Output(calldepth <a href="../builtin/index.html#int">int</a>, s <a href="../builtin/index.html#string">string</a>) <a href="../builtin/index.html#error">error</a></pre>
|
|
<p>
|
|
Output writes the output for a logging event. The string s contains
|
|
the text to print after the prefix specified by the flags of the
|
|
Logger. A newline is appended if the last character of s is not
|
|
already a newline. Calldepth is used to recover the PC and is
|
|
provided for generality, although at the moment on all pre-defined
|
|
paths it will be 2.
|
|
</p>
|
|
|
|
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|
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|
|
<h3 id="Logger.Panic">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=6654:6694#L193">Panic</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Panic(v ...interface{})</pre>
|
|
<p>
|
|
Panic is equivalent to l.Print() followed by a call to panic().
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.Panicf">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=6818:6874#L200">Panicf</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Panicf(format <a href="../builtin/index.html#string">string</a>, v ...interface{})</pre>
|
|
<p>
|
|
Panicf is equivalent to l.Printf() followed by a call to panic().
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.Panicln">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=7009:7051#L207">Panicln</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Panicln(v ...interface{})</pre>
|
|
<p>
|
|
Panicln is equivalent to l.Println() followed by a call to panic().
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.Prefix">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=7433:7465#L228">Prefix</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Prefix() <a href="../builtin/index.html#string">string</a></pre>
|
|
<p>
|
|
Prefix returns the output prefix for the logger.
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.Print">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=5814:5854#L168">Print</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Print(v ...interface{})</pre>
|
|
<p>
|
|
Print calls l.Output to print to the logger.
|
|
Arguments are handled in the manner of fmt.Print.
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.Printf">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=5611:5667#L162">Printf</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Printf(format <a href="../builtin/index.html#string">string</a>, v ...interface{})</pre>
|
|
<p>
|
|
Printf calls l.Output to print to the logger.
|
|
Arguments are handled in the manner of fmt.Printf.
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.Println">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=5995:6037#L172">Println</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) Println(v ...interface{})</pre>
|
|
<p>
|
|
Println calls l.Output to print to the logger.
|
|
Arguments are handled in the manner of fmt.Println.
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.SetFlags">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=7291:7326#L221">SetFlags</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) SetFlags(flag <a href="../builtin/index.html#int">int</a>)</pre>
|
|
<p>
|
|
SetFlags sets the output flags for the logger.
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.SetOutput">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=2944:2983#L55">SetOutput</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) SetOutput(w <a href="../io/index.html">io</a>.<a href="../io/index.html#Writer">Writer</a>)</pre>
|
|
<p>
|
|
SetOutput sets the output destination for the logger.
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3 id="Logger.SetPrefix">func (*Logger) <a href="http://localhost:6060/src/log/log.go?s=7574:7615#L235">SetPrefix</a></h3>
|
|
<pre>func (l *<a href="index.html#Logger">Logger</a>) SetPrefix(prefix <a href="../builtin/index.html#string">string</a>)</pre>
|
|
<p>
|
|
SetPrefix sets the output prefix for the logger.
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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|
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|
|
<h2 id="pkg-subdirectories">Subdirectories</h2>
|
|
|
|
|
|
|
|
|
|
<div class="pkg-dir">
|
|
<table>
|
|
<tr>
|
|
<th class="pkg-name">Name</th>
|
|
<th class="pkg-synopsis">Synopsis</th>
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
<td colspan="2"><a href="http://localhost:6060/pkg/">..</a></td>
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
<tr>
|
|
<td class="pkg-name" style="padding-left: 0px;">
|
|
<a href="syslog/index.html">syslog</a>
|
|
</td>
|
|
<td class="pkg-synopsis">
|
|
Package syslog provides a simple interface to the system log service.
|
|
</td>
|
|
</tr>
|
|
|
|
|
|
</table>
|
|
</div>
|
|
|
|
|
|
|
|
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|
|
|
|
|
<div id="footer">
|
|
Build version go1.6.<br>
|
|
Except as <a href="https://developers.google.com/site-policies#restrictions">noted</a>,
|
|
the content of this page is licensed under the
|
|
Creative Commons Attribution 3.0 License,
|
|
and code is licensed under a <a href="http://localhost:6060/LICENSE">BSD license</a>.<br>
|
|
<a href="http://localhost:6060/doc/tos.html">Terms of Service</a> |
|
|
<a href="http://www.google.com/intl/en/policies/privacy/">Privacy Policy</a>
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</div>
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</div><!-- .container -->
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</div><!-- #page -->
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<!-- TODO(adonovan): load these from <head> using "defer" attribute? -->
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<script type="text/javascript" src="../../lib/godoc/jquery.js"></script>
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<script type="text/javascript" src="../../lib/godoc/jquery.treeview.js"></script>
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<script type="text/javascript" src="../../lib/godoc/jquery.treeview.edit.js"></script>
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<script type="text/javascript" src="../../lib/godoc/godocs.js"></script>
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</body>
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</html>
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