621 lines
36 KiB
HTML
621 lines
36 KiB
HTML
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<meta name="generator" content="Asciidoctor 1.5.8">
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<title>trace API</title>
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</style>
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</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>trace API</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div id="preamble">
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>The trace API can be used to print debug messages to stderr or a file. Trace
|
|
code is inactive unless explicitly enabled by setting <code>GIT_TRACE*</code> environment
|
|
variables.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The trace implementation automatically adds <code>timestamp file:line ... \n</code> to
|
|
all trace messages. E.g.:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>23:59:59.123456 git.c:312 trace: built-in: git 'foo'
|
|
00:00:00.000001 builtin/foo.c:99 foo: some message</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_data_structures">Data Structures</h2>
|
|
<div class="sectionbody">
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>struct trace_key</code></dt>
|
|
<dd>
|
|
<p>Defines a trace key (or category). The default (for API functions that
|
|
don’t take a key) is <code>GIT_TRACE</code>.</p>
|
|
<div class="paragraph">
|
|
<p>E.g. to define a trace key controlled by environment variable <code>GIT_TRACE_FOO</code>:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>static struct trace_key trace_foo = TRACE_KEY_INIT(FOO);
|
|
|
|
static void trace_print_foo(const char *message)
|
|
{
|
|
trace_printf_key(&trace_foo, "%s", message);
|
|
}</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Note: don’t use <code>const</code> as the trace implementation stores internal state in
|
|
the <code>trace_key</code> structure.</p>
|
|
</div>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_functions">Functions</h2>
|
|
<div class="sectionbody">
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>int trace_want(struct trace_key *key)</code></dt>
|
|
<dd>
|
|
<p>Checks whether the trace key is enabled. Used to prevent expensive
|
|
string formatting before calling one of the printing APIs.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>void trace_disable(struct trace_key *key)</code></dt>
|
|
<dd>
|
|
<p>Disables tracing for the specified key, even if the environment
|
|
variable was set.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>void trace_printf(const char *format, ...)</code></dt>
|
|
<dt class="hdlist1"><code>void trace_printf_key(struct trace_key *key, const char *format, ...)</code></dt>
|
|
<dd>
|
|
<p>Prints a formatted message, similar to printf.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>void trace_argv_printf(const char **argv, const char *format, ...)`</code></dt>
|
|
<dd>
|
|
<p>Prints a formatted message, followed by a quoted list of arguments.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>void trace_strbuf(struct trace_key *key, const struct strbuf *data)</code></dt>
|
|
<dd>
|
|
<p>Prints the strbuf, without additional formatting (i.e. doesn’t
|
|
choke on <code>%</code> or even <code>\0</code>).</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>uint64_t getnanotime(void)</code></dt>
|
|
<dd>
|
|
<p>Returns nanoseconds since the epoch (01/01/1970), typically used
|
|
for performance measurements.</p>
|
|
<div class="paragraph">
|
|
<p>Currently there are high precision timer implementations for Linux (using
|
|
<code>clock_gettime(CLOCK_MONOTONIC)</code>) and Windows (<code>QueryPerformanceCounter</code>).
|
|
Other platforms use <code>gettimeofday</code> as time source.</p>
|
|
</div>
|
|
</dd>
|
|
<dt class="hdlist1"><code>void trace_performance(uint64_t nanos, const char *format, ...)</code></dt>
|
|
<dt class="hdlist1"><code>void trace_performance_since(uint64_t start, const char *format, ...)</code></dt>
|
|
<dd>
|
|
<p>Prints the elapsed time (in nanoseconds), or elapsed time since
|
|
<code>start</code>, followed by a formatted message. Enabled via environment
|
|
variable <code>GIT_TRACE_PERFORMANCE</code>. Used for manual profiling, e.g.:</p>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>uint64_t start = getnanotime();
|
|
/* code section to measure */
|
|
trace_performance_since(start, "foobar");</pre>
|
|
</div>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>uint64_t t = 0;
|
|
for (;;) {
|
|
/* ignore */
|
|
t -= getnanotime();
|
|
/* code section to measure */
|
|
t += getnanotime();
|
|
/* ignore */
|
|
}
|
|
trace_performance(t, "frotz");</pre>
|
|
</div>
|
|
</div>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_bugs_caveats">Bugs & Caveats</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>GIT_TRACE_* environment variables can be used to tell Git to show
|
|
trace output to its standard error stream. Git can often spawn a pager
|
|
internally to run its subcommand and send its standard output and
|
|
standard error to it.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Because GIT_TRACE_PERFORMANCE trace is generated only at the very end
|
|
of the program with atexit(), which happens after the pager exits, it
|
|
would not work well if you send its log to the standard error output
|
|
and let Git spawn the pager at the same time.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>As a work around, you can for example use <em>--no-pager</em>, or set
|
|
GIT_TRACE_PERFORMANCE to another file descriptor which is redirected
|
|
to stderr, or set GIT_TRACE_PERFORMANCE to a file specified by its
|
|
absolute path.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>For example instead of the following command which by default may not
|
|
print any performance information:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>GIT_TRACE_PERFORMANCE=2 git log -1</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>you may want to use:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>GIT_TRACE_PERFORMANCE=2 git --no-pager log -1</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>or:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>GIT_TRACE_PERFORMANCE=3 3>&2 git log -1</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>or:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>GIT_TRACE_PERFORMANCE=/path/to/log/file git log -1</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated 2019-02-26 19:31:11 UTC
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