~nabijaczleweli/febug

ref: 20f6485d6db9f04cfcb914563b7f1f779a7eb41f febug/FreeBSD/libfebug.3.html -rw-r--r-- 18.2 KiB
20f6485d — наб autouploader FreeBSD manpage update by job 403137 9 months ago
                                                                                
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  <title>LIBFEBUG(3)</title>
</head>
<body>
<table class="head">
  <tr>
    <td class="head-ltitle">LIBFEBUG(3)</td>
    <td class="head-vol">FreeBSD Library Functions Manual</td>
    <td class="head-rtitle">LIBFEBUG(3)</td>
  </tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<code class="Fn">febug_start</code>(), <code class="Fn">febug_end</code>(),
  <code class="Fn">febug_register_type</code>(),
  <code class="Fn">febug_wrap</code>(), <code class="Fn">febug_unwrap</code>()
  &#x2014;
<div class="Nd">User-space debugfs ABI wrapper library</div>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<code class="In">#include
  &lt;<a class="In" href="https://git.sr.ht/~nabijaczleweli/febug/tree/trunk/item/include/libfebug.h">libfebug.h</a>&gt;</code>
<p class="Pp"><span class="Lb">library &#x201C;libfebug&#x201D;</span></p>
<p class="Pp">
  <br/>
  <code class="Fd">#define FEBUG_DONT 0</code>
  <br/>
  <code class="Fd">#define FEBUG_SOCKET &quot;/var/run/febug.sock&quot;</code>
  <br/>
  <code class="Fd">#define FEBUG_SIGNUM SIGUSR2</code></p>
<p class="Pp">
  <br/>
  <code class="Fd">getenv(&quot;FEBUG_DONT&quot;)</code>
  <br/>
  <code class="Fd">getenv(&quot;FEBUG_SOCKET&quot;)</code></p>
<p class="Pp">
  <br/>
  <var class="Vt">int febug_global_controlled_socket</var> = -1;</p>
<p class="Pp">
  <br/>
  <var class="Ft">void</var> <code class="Fn">febug_start</code>();</p>
<p class="Pp"><var class="Ft">void</var>
    <code class="Fn">febug_start_path</code>(<var class="Fa" style="white-space: nowrap;">const
    char * path</var>);</p>
<p class="Pp"><var class="Ft">void</var>
    <code class="Fn">febug_debug_handler</code>(<var class="Fa" style="white-space: nowrap;">int</var>);</p>
<p class="Pp"><var class="Ft">void</var>
    <code class="Fn">febug_register_type</code>(<var class="Fa" style="white-space: nowrap;">uint64_t
    type</var>, <var class="Fa" style="white-space: nowrap;">void
    (*formatter)(int, size_t)</var>);</p>
<p class="Pp"><var class="Ft">void</var>
    <code class="Fn">febug_wrap</code>(<var class="Fa" style="white-space: nowrap;">uint64_t
    type</var>, <var class="Fa" style="white-space: nowrap;">const void *
    data</var>, <var class="Fa" style="white-space: nowrap;">const char *
    name</var>, <var class="Fa" style="white-space: nowrap;">...</var>);</p>
<p class="Pp"><var class="Ft">void</var>
    <code class="Fn">febug_wrap_signal</code>(<var class="Fa" style="white-space: nowrap;">uint64_t
    type</var>, <var class="Fa" style="white-space: nowrap;">const void *
    data</var>, <var class="Fa" style="white-space: nowrap;">uint8_t
    signal</var>, <var class="Fa" style="white-space: nowrap;">const char *
    name</var>, <var class="Fa" style="white-space: nowrap;">...</var>);</p>
<p class="Pp"><var class="Ft">void</var>
    <code class="Fn">febug_wrap_signalv</code>(<var class="Fa" style="white-space: nowrap;">uint64_t
    type</var>, <var class="Fa" style="white-space: nowrap;">const void *
    data</var>, <var class="Fa" style="white-space: nowrap;">uint8_t
    signal</var>, <var class="Fa" style="white-space: nowrap;">const char *
    name</var>, <var class="Fa" style="white-space: nowrap;">va_list
  ap</var>);</p>
<p class="Pp"><var class="Ft">void</var>
    <code class="Fn">febug_unwrap</code>(<var class="Fa" style="white-space: nowrap;">const
    void * data</var>);</p>
<p class="Pp"><var class="Ft">void</var>
  <code class="Fn">febug_end</code>();</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<b class="Sy">libfebug</b> allows a programmer to simplify writing programs
  debuggable with <a class="Xr" href="febug.8.html">febug(8)</a> by presenting a high-level
  interface to <a class="Xr" href="febug-abi.5.html">febug-abi(5)</a>.
<p class="Pp">There are three compile-time macros that allow a program to
    customise its behaviour:</p>
<dl class="Bl-tag">
  <dt></dt>
  <dd><code class="Fd">FEBUG_DONT</code> If non-zero, all symbols become
      <b class="Sy">static</b>, functions turn into no-ops, and therefore no
      symbols from libfebug.a/.so are imported at link-time; this is intended as
      a way to easily disable <a class="Xr" href="febug.8.html">febug(8)</a> integration completely
      on release builds.</dd>
  <dt></dt>
  <dd><code class="Fd">FEBUG_SIGNUM</code> The signal to request from
      <a class="Xr" href="febug.8.html">febug(8)</a> when using
      <code class="Fn">febug_wrap</code>(). Defaults to
      <code class="Li">SIGUSR2</code>.</dd>
  <dt></dt>
  <dd><code class="Fd">FEBUG_SOCKET</code> The path to connect to
      <a class="Xr" href="febug.8.html">febug(8)</a> on. Defaults to
      <span class="Pa">/var/run/febug.sock</span>.</dd>
</dl>
<p class="Pp">There are two environment variables that allow a user to customise
    its behaviour:</p>
<dl class="Bl-tag">
  <dt><i class="Em">FEBUG_DONT</i></dt>
  <dd>If set, don't try to connect to <a class="Xr" href="febug.8.html">febug(8)</a>, so all library
      functions become no-ops.</dd>
  <dt><i class="Em">FEBUG_SOCKET</i></dt>
  <dd>If set, use its value instead of <b class="Sy">FEBUG_SOCKET</b> to connect
      to <a class="Xr" href="febug.8.html">febug(8)</a></dd>
</dl>
<p class="Pp">To be debugged, a program needs to, first, call
    <code class="Fn">febug_start_path</code>() (likely via
    <code class="Fn">febug_start</code>(), which simply passes
    <code class="Fd">FEBUG_SOCKET</code> thereto) to connect to
    <a class="Xr" href="febug.8.html">febug(8)</a>, which, if successful, will set
    <var class="Vt">febug_global_controlled_socket</var> appropriately.</p>
<p class="Pp">The program needs to install
    <code class="Fn">febug_debug_handler</code>() (or a wrapper around it) as
    the signal handler for <b class="Sy">FEBUG_SIGNUM</b> (and any other
    signals, if different ones are explicitly requested; if
    <code class="Dv">SIGKILL</code>, some event loop that answers on
    <var class="Vt">febug_global_controlled_socket</var> must be in place). It's
    a no-op if <var class="Vt">febug_global_controlled_socket</var> is -1. This
    finishes set-up.</p>
<p class="Pp">The program should register handlers for types of variables it
    wishes to handle by calling <code class="Fn">febug_register_type</code>()
    &#x2014; those type numbers should be consistent across the program, lest
    the wrong handler is called. If no handler was registered for a type,
    <code class="Fn">febug_debug_handler</code>() will write a generic &quot;not
    found&quot; message. The handler takes the write end of the pipe as the
    first argument, and the variable ID as the second; it shouldn't close the
    pipe, as that is done by <code class="Fn">febug_debug_handler</code>()
    regardless, and the program would then run the risk of closing another file
    with the same descriptor simultaneously opened by another thread. It's a
    no-op if <var class="Vt">febug_global_controlled_socket</var> is -1.</p>
<p class="Pp">At any time, when the program wishes to expose a variable, it can
    call <code class="Fn">febug_wrap_signalv</code>() (likely via
    <code class="Fn">febug_wrap_signal</code>() (likely via
    <code class="Fn">febug_wrap</code>(), which passes
    <b class="Sy">FEBUG_SIGNUM</b> thereto)), which will send a
    <b class="Sy">febug_message</b> with the specified type and signal numbers,
    ID equal to the data pointer, and name formatted according to
    <a class="Xr">printf(3)</a>. It's a no-op if
    <var class="Vt">febug_global_controlled_socket</var> is -1.</p>
<p class="Pp">When the variable goes out of scope, the program should call
    <code class="Fn">febug_unwrap</code>() to send a
    <b class="Sy">stop_febug_message</b> with the same data pointer as it did
    <code class="Fn">febug_wrap</code>(), to prevent reading random data that
    might no longer be mapped, or make sense. It's a no-op if
    <var class="Vt">febug_global_controlled_socket</var> is -1.</p>
<p class="Pp">When it wishes to stop being debugged, the program may call
    <code class="Fn">febug_end</code>() which will shutter and reset
    <var class="Vt">febug_global_controlled_socket</var>, if any, and deallocate
    the type-&gt;handler map. The program may omit this if it'd be the last
    thing it did before exiting, since the kernel will close all FDs and free
    all mappings anyway.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
The following program sorts a string with <a class="Xr">qsort(3)</a> but waits
  half a second between each comparison; the string can be inspected via a
  <a class="Xr" href="febug.8.html">febug(8)</a> mount:
<div class="Bd Pp Bd-indent">
<pre>
// SPDX-License-Identifier: MIT


#define _POSIX_C_SOURCE 200809L

#include &lt;libfebug.h&gt;

#include &lt;signal.h&gt;

#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;string.h&gt;
#include &lt;time.h&gt;
#include &lt;errno.h&gt;
#include &lt;unistd.h&gt;


#define CSTRING_FEBUG_TP 420
static void cstring_febug_formatter(int fd, size_t data) {
	const char * str = (const char *)data;
	dprintf(fd, &quot;%s\n&quot;, str);
}


static int char_comp(const void * lhs, const void * rhs) {
	const struct timespec half_second = {0, 500 * 1000 * 1000};
	nanosleep(&amp;half_second, 0);

	return *(const char *)lhs - *(const char *)rhs;
}


int main() {
	febug_start();
	febug_register_type(CSTRING_FEBUG_TP, cstring_febug_formatter);


	struct sigaction handler;
	memset(&amp;handler, 0, sizeof(handler));
	handler.sa_handler = febug_debug_handler;
	if(sigaction(FEBUG_SIGNUM, &amp;handler, 0) == -1) {
		fprintf(stderr, &quot;sigaction: %s\n&quot;, strerror(errno));
		return 1;
	}


	{
		__attribute__((__cleanup__(febug_unwrap))) char data[] = &quot;JVLOkgsYmhCyEFxouKzDNajivGlpWqbdBwnfTAXQcreRHPIUSMtZQWERTYUIOPqwertyuiop1234567890&quot;;
		febug_wrap(CSTRING_FEBUG_TP, data, &quot;cool_data&quot;);

		qsort(data, strlen(data), 1, char_comp);
	}

	sleep(2);

	febug_end();
}
</pre>
</div>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
  ALSO</a></h1>
<a class="Xr" href="febug-abi.5.html">febug-abi(5)</a> &#x2014; the ABI wrapped by this library.
<p class="Pp"><a class="Xr" href="libfebug++.3.html">libfebug++(3)</a> &#x2014; an equivalent C++
    library.</p>
<p class="Pp"><a class="Xr" href="libfebug++.3.html">libfebug++(3)</a> &#x2014; an equivalent Rust
    library.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
Written by <span class="An">&#x043D;&#x0430;&#x0431;</span>
  &lt;<a class="Mt" href="mailto:nabijaczleweli@nabijaczleweli.xyz">nabijaczleweli@nabijaczleweli.xyz</a>&gt;
</section>
<section class="Sh">
<h1 class="Sh" id="SPECIAL_THANKS"><a class="permalink" href="#SPECIAL_THANKS">SPECIAL
  THANKS</a></h1>
To all who support further development, in particular:
<ul class="Bl-bullet Bl-compact">
  <li>ThePhD</li>
  <li>Embark Studios</li>
</ul>
</section>
<section class="Sh">
<h1 class="Sh" id="REPORTING_BUGS"><a class="permalink" href="#REPORTING_BUGS">REPORTING
  BUGS</a></h1>
<a class="Lk" href="https://todo.sr.ht/~nabijaczleweli/febug">febug tracker</a>
<p class="Pp">febug mailing list:
    &lt;<a class="Mt" href="mailto:~nabijaczleweli/febug@lists.sr.ht">~nabijaczleweli/febug@lists.sr.ht</a>&gt;
    archived at
    <a class="Lk" href="https://lists.sr.ht/~nabijaczleweli/febug">https://lists.sr.ht/~nabijaczleweli/febug</a></p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">January 21, 2021</td>
    <td class="foot-os">FreeBSD 12.1-RELEASE-p10</td>
  </tr>
</table>
</body>
</html>