~nabijaczleweli/febug

ref: e2b7f9d5a05b8cb45f0a8af6b2acd6351e3b06ca febug/OpenBSD/libfebug++.3.html -rw-r--r-- 18.6 KiB
e2b7f9d5 — наб autouploader OpenBSD manpage update by job 402754 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">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>
<p class="Pp"><b class="Sy">febug::controlled_socket</b>,
    <b class="Sy">febug::wrapper</b>, <var class="Vt">febug::formatters</var>,
    <code class="Fn">febug::debug_handler</code>() &#x2014;
    <span class="Nd">User-space debugfs ABI wrapper library for C++</span></p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<p class="Pp"><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></p>
<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"><b class="Sy">struct febug::controlled_socket;</b>
  <br/>
  <var class="Vt">const febug::controlled_socket
    febug::global_controlled_socket;</var></p>
<p class="Pp"><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>);</p>
<p class="Pp"><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>);</p>
<p class="Pp"><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>);</p>
<p class="Pp"><var class="Vt">std::map&lt;size_t, void (*)(int, size_t)&gt;
    febug::formatters;</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>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp"><a class="permalink" href="#libfebug++"><b class="Sy" id="libfebug++">libfebug++</b></a>
    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>.</p>
<p class="Pp">There are three compile-time macros that allow a program to
    customise its behaviour:</p>
<dl class="Bl-tag">
  <dt id="static"></dt>
  <dd><code class="Fd">FEBUG_DONT</code> If non-zero, all symbols become
      <a class="permalink" href="#static"><b class="Sy">static</b></a>,
      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 id="febug_wrap"></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
      <a class="permalink" href="#febug_wrap"><code class="Fn">febug_wrap</code></a>().
      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 id="FEBUG_DONT"><a class="permalink" href="#FEBUG_DONT"><i class="Em">FEBUG_DONT</i></a></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 id="FEBUG_SOCKET"><a class="permalink" href="#FEBUG_SOCKET"><i class="Em">FEBUG_SOCKET</i></a></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">The <b class="Sy">febug::controlled_socket</b> structure is
    defined as follows:</p>
<div class="Bd Pp Bd-indent">
<pre>
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>
<p class="Pp">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>.</p>
<p class="Pp" id="febug::debug_handler">The program needs to install
    <a class="permalink" href="#febug::debug_handler"><code class="Fn">febug::debug_handler</code></a>()
    (or a wrapper around it) as the signal handler for
    <a class="permalink" href="#FEBUG_SIGNUM"><b class="Sy" id="FEBUG_SIGNUM">FEBUG_SIGNUM</b></a>
    (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" id="febug::debug_handler~2">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,
    <a class="permalink" href="#febug::debug_handler~2"><code class="Fn">febug::debug_handler</code></a>()
    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.</p>
<p class="Pp">The <b class="Sy">febug::wrapper</b> structure is defined as
    follows:</p>
<div class="Bd Pp Bd-indent">
<pre>
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>
<p class="Pp" id="febug_message">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
    <a class="permalink" href="#febug_message"><b class="Sy">febug_message</b></a>
    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
    <a class="permalink" href="#stop_febug_message"><b class="Sy" id="stop_febug_message">stop_febug_message</b></a>.
    Both become no-ops if <var class="Vt">febug::global_controlled_socket</var>
    is -1.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
<p class="Pp">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:</p>
<div class="Bd Pp Bd-indent">
<pre>
// 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;\n&quot;, 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;%zu\n&quot;, data);
		});
	}


	struct sigaction handler {};
	handler.sa_handler = febug::debug_handler;
	if(sigaction(FEBUG_SIGNUM, &amp;handler, nullptr) == -1)
		std::fprintf(stderr, &quot;sigaction: %s\n&quot;, 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>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
  ALSO</a></h1>
<p class="Pp"><a class="Xr" href="febug-abi.5.html">febug-abi(5)</a> &#x2014; the ABI wrapped by this
    library.</p>
<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>
<p class="Pp">Written by <span class="An">&#x043D;&#x0430;&#x0431;</span>
    &lt;<a class="Mt" href="mailto:nabijaczleweli@nabijaczleweli.xyz">nabijaczleweli@nabijaczleweli.xyz</a>&gt;</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SPECIAL_THANKS"><a class="permalink" href="#SPECIAL_THANKS">SPECIAL
  THANKS</a></h1>
<p class="Pp">To all who support further development, in particular:</p>
<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>
<p class="Pp"><a class="Lk" href="https://todo.sr.ht/~nabijaczleweli/febug">febug
    tracker</a></p>
<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">OpenBSD 6.8</td>
  </tr>
</table>
</body>
</html>