~nabijaczleweli/febug

ref: f2e2a7f676c04f383026174fdd55e698baf35379 febug/Debian/libfebug.3.html -rw-r--r-- 18.0 KiB
f2e2a7f6 — наб autouploader FreeBSD manpage update by job 411516 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="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>
<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>
<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>
<br/>
<var class="Vt">int febug_global_controlled_socket</var> = -1;
<div class="Pp"></div>
<br/>
<var class="Ft">void</var>
  <code class="Fn">febug_start</code>();
<div class="Pp"></div>
<var class="Ft">void</var>
  <code class="Fn">febug_start_path</code>(<var class="Fa" style="white-space: nowrap;">const
  char * path</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>);
<div class="Pp"></div>
<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>);
<div class="Pp"></div>
<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>);
<div class="Pp"></div>
<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>);
<div class="Pp"></div>
<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>);
<div class="Pp"></div>
<var class="Ft">void</var>
  <code class="Fn">febug_unwrap</code>(<var class="Fa" style="white-space: nowrap;">const
  void * data</var>);
<div class="Pp"></div>
<var class="Ft">void</var>
  <code class="Fn">febug_end</code>();
<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>.
<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>
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.
<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 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.
<div class="Pp"></div>
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.
<div class="Pp"></div>
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.
<div class="Pp"></div>
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.
<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="Pp"></div>
<div class="Bd Bd-indent">
<pre class="Li">
// 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;%s0, 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: %s0, 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>
<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 25, 2021</td>
    <td class="foot-os">Debian</td>
  </tr>
</table>
</body>
</html>