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8bab4a8d — наб autouploader Debian manpage update by job 412471 8 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">Library Functions Manual</td>
    <td class="head-rtitle">LIBFEBUG++(3)</td>
  </tr>
</table>
<div class="manual-text">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<code class="Nm">febug::controlled_socket</code>,
  <code class="Nm">febug::wrapper</code>,
  <code class="Nm">febug::formatters</code>,
  <code class="Nm">febug::debug_handler()</code> &#x2014;
<div class="Nd">User-space debugfs ABI wrapper library for C++</div>
<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.hpp">libfebug.hpp</a>&gt;</code>
<div class="Pp"></div>
<span class="Lb">library &#x201C;libfebug++&#x201D;</span>
<div class="Pp"></div>
<br/>
<code class="Fd">#define FEBUG_DONT 0</code>
<br/>
<code class="Fd">#define FEBUG_SOCKET
  &quot;/run/febug.sock&quot;</code>
<br/>
<code class="Fd">#define FEBUG_SIGNUM SIGUSR2</code>
<div class="Pp"></div>
<br/>
<code class="Fd">getenv(&quot;FEBUG_DONT&quot;)</code>
<br/>
<code class="Fd">getenv(&quot;FEBUG_SOCKET&quot;)</code>
<div class="Pp"></div>
<b class="Sy">struct febug::controlled_socket;</b>
<br/>
<var class="Vt">const febug::controlled_socket
  febug::global_controlled_socket;</var>
<div class="Pp"></div>
<b class="Sy">struct febug::wrapper;</b>
<br/>
<code class="Fn">febug::wrapper::wrapper</code>(<var class="Fa" style="white-space: nowrap;">const
  T &amp; data</var>,
  <var class="Fa" style="white-space: nowrap;">const char *
  name</var>,
  <var class="Fa" style="white-space: nowrap;">...</var>);
<div class="Pp"></div>
<code class="Fn">febug::wrapper::wrapper</code>(<var class="Fa" style="white-space: nowrap;">const
  T &amp; 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>);
<div class="Pp"></div>
<code class="Fn">febug::wrapper::wrapper</code>(<var class="Fa" style="white-space: nowrap;">const
  T &amp; 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>);
<div class="Pp"></div>
<var class="Vt">std::map&lt;size_t, void (*)(int, size_t)&gt;
  febug::formatters;</var>
<div class="Pp"></div>
<var class="Ft">void</var>
  <code class="Fn">febug::debug_handler</code>(<var class="Fa" style="white-space: nowrap;">int</var>);
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<b class="Sy">libfebug++</b> allows a programmer to simplify writing
  C++ 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>.
<div class="Pp"></div>
There are three compile-time macros that allow a program to customise its
  behaviour:
<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">/run/febug.sock</span>.</dd>
</dl>
<div class="Pp"></div>
There are two environment variables that allow a user to customise its
  behaviour:
<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>
<div class="Pp"></div>
The <b class="Sy">febug::controlled_socket</b> structure is defined
  as follows:
<div class="Pp"></div>
<div class="Bd Bd-indent">
<pre class="Li">
struct febug::controlled_socket { 
    int fd = -1; 
    inline operator int() const noexcept { return this-&gt;fd; } 
    controlled_socket(const char * path = FEBUG_SOCKET) noexcept; 
    ~controlled_socket() noexcept; 
};
</pre>
</div>
<div class="Pp"></div>
There is a global instance at
  <var class="Vt">febug::global_controlled_socket</var> which, if
  <var class="Vt">path</var> isn't the null pointer, attempts
  connection to <a class="Xr" href="febug.8.html">febug(8)</a> and will set
  <var class="Vt">fd</var>, if successful. Similarly, destroying it
  will hang up and reset <var class="Vt">fd</var>.
<div class="Pp"></div>
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.
<div class="Pp"></div>
The program should register handlers for types of variables it wishes to handle
  by adding entries to <var class="Vt">febug::formatters</var>
  &#x2014; the key is typeid(std::decay_t&lt;T&gt;).hash_code(), so if this
  yields different results for two types that should have the same handler,
  multiple entries need to be registered. 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.
<div class="Pp"></div>
The <b class="Sy">febug::wrapper</b> structure is defined as follows:
<div class="Pp"></div>
<div class="Bd Bd-indent">
<pre class="Li">
template &lt;class T&gt; 
struct febug::wrapper { 
    const T * data; 
    wrapper(const T &amp; data, const char * name, ...) noexcept; 
    wrapper(const T &amp; data, uint8_t signal, const char * name, ...) noexcept; 
    wrapper(const T &amp; data, uint8_t signal, const char * name, va_list ap) noexcept; 
    ~wrapper() noexcept; 
};
</pre>
</div>
<div class="Pp"></div>
If the program wishes to debug a variable, it should construct a
  <b class="Sy">febug::wrapper</b> referencing it; the constructor
  will send a <b class="Sy">febug_message</b> with the type
  corresponding to
  <code class="Dv">typeid(std::decay_t&lt;T&gt;).hash_code()</code>,
  ID corresponding to the pointer to <var class="Vt">data</var>,
  signal being either specified or defaulting to
  <code class="Fd">FEBUG_SIGNUM,</code> and name formatted according
  to <a class="Xr">printf(3)</a>. The destructor will send a
  <b class="Sy">stop_febug_message</b>. Both become no-ops if
  <var class="Vt">febug::global_controlled_socket</var> is -1.
<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
The following program sorts a std::vector&lt;int&gt; with
  <code class="Fn">std::sort</code>() but waits a second between each
  comparison; the vector and the amount of comparisons can be inspected via a
  <a class="Xr" href="febug.8.html">febug(8)</a> mount:
<div class="Pp"></div>
<div class="Bd Bd-indent">
<pre class="Li">
// SPDX-License-Identifier: MIT 
 
 
#include &lt;libfebug.hpp&gt; 
 
#include &lt;vector&gt; 
 
#include &lt;algorithm&gt; 
#include &lt;cstring&gt; 
#include &lt;errno.h&gt; 
 
#include &lt;unistd.h&gt; 
 
 
int main() { 
	if(febug::global_controlled_socket != -1) { 
		febug::formatters.emplace(typeid(std::vector&lt;int&gt;).hash_code(), [](int retpipe, std::size_t vid) { 
			const std::vector&lt;int&gt; &amp; data = *(const std::vector&lt;int&gt; *)vid; 
			for(auto num : data) 
				dprintf(retpipe, &quot;%d &quot;, num); 
			write(retpipe, &quot;0, 1); 
		}); 
		febug::formatters.emplace(typeid(std::size_t).hash_code(), [](int retpipe, std::size_t vid) { 
			const std::size_t &amp; data = *(const std::size_t *)vid; 
			dprintf(retpipe, &quot;%zu0, data); 
		}); 
	} 
 
 
	struct sigaction handler {}; 
	handler.sa_handler = febug::debug_handler; 
	if(sigaction(FEBUG_SIGNUM, &amp;handler, nullptr) == -1) 
		std::fprintf(stderr, &quot;sigaction: %s0, std::strerror(errno)); 
 
 
	{ 
		std::vector&lt;int&gt; data{-1, -2, -3, 0, 1, 2, 3, -1, -2, -3, 0, 1, 2, 3, -1, -2, -3, 0, 1, 2, 3, 
		                      -1, -2, -3, 0, 1, 2, 3, -1, -2, -3, 0, 1, 2, 3, -1, -2, -3, 0, 1, 2, 3}; 
		std::size_t comparisons_done{}; 
		febug::wrapper data_w{data, &quot;cool_data&quot;}; 
		febug::wrapper comparisons_done_w{comparisons_done, &quot;comparisons&quot;}; 
 
		std::sort(data.begin(), data.end(), [&amp;](auto lhs, auto rhs) { 
			sleep(1); 
			++comparisons_done; 
			return lhs &lt; rhs; 
		}); 
	} 
 
	sleep(2); 
}
</pre>
</div>
<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.
<div class="Pp"></div>
<a class="Xr" href="libfebug.3.html">libfebug(3)</a> &#x2014; an equivalent C library.
<div class="Pp"></div>
<a class="Xr" href="libfebug.3.html">libfebug(3)</a> &#x2014; an equivalent Rust library.
<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;
<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>
<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>
<div class="Pp"></div>
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></div>
<table class="foot">
  <tr>
    <td class="foot-date">January 31, 2021</td>
    <td class="foot-os">Debian</td>
  </tr>
</table>
</body>
</html>