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<h1>Class <code>nixio.README</code></h1>

<p>
 General Information.</p>


<h2>Tables</h2>
<table class="table_list">

	<tr>
	<td class="name" nowrap><a href="#Errorhandling">Errorhandling</a></td>
	<td class="summary">
 General error handling information.</td>
	</tr>

	<tr>
	<td class="name" nowrap><a href="#Functions">Functions</a></td>
	<td class="summary">
 Function conventions.</td>
	</tr>

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	<td class="name" nowrap><a href="#Platforms">Platforms</a></td>
	<td class="summary">
 Platform information.</td>
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	<tr>
	<td class="name" nowrap><a href="#TLS-Crypto">TLS-Crypto</a></td>
	<td class="summary">
 Cryptography and TLS libraries.</td>
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</table>


<br/>
<br/>


<h2><a name="tables"></a>Tables</h2>
<dl class="table">

<dt><a name="Errorhandling"></a><strong>Errorhandling</strong></dt>
<dd>
 General error handling information. 
 <ul> 
 <li> Most of the functions available in this library may fail. If any error 
 occurs the function returns <strong>nil or false</strong>, an error code 
 (usually errno) and an additional error message text (if avaialable).</li> 
 <li>At the moment false is only returned when a non-blocking I/O function 
 fails with EAGAIN, EWOULDBLOCK or WSAEWOULDBLOCK for any others nil is 
 returned as first parameter. Therefore you can use false to write portable 
 non-blocking I/O applications.</li> 
 <li>Note that the function documentation does only mention the return values 
 in case of a successful operation.</li>  
 <li>You can find a table of common error numbers and other useful constants 
 like signal numbers in <strong>nixio.const</strong> e.g. nixio.const.EINVAL, 
 nixio.const.SIGTERM, etc. For portability there is a second error constant 
 table <strong>nixio.const_sock</strong> for socket error codes. This might 
 be important if you are dealing with Windows applications, on POSIX however 
 const_sock is just an alias for const.</li> 
 <li>With some exceptions - which are explicitly stated in the function 
 documentation - all blocking functions are signal-protected and will not fail 
 with EINTR.</li> 
 <li>On POSIX the SIGPIPE signal will be set to ignore upon initialization. 
 You should restore the default behaviour or set a custom signal handler 
 in your program after loading nixio if you need this behaviour.</li> 
 </ul>


</dd>


<dt><a name="Functions"></a><strong>Functions</strong></dt>
<dd>
 Function conventions. 
 <br />In general all functions are namend and behave like their POSIX API 
 counterparts - where applicable - applying the following rules: 
 <ul> 
 <li>Functions should be named like the underlying POSIX API function omitting 
 prefixes or suffixes - especially when placed in an object-context ( 
 lockf -> File:lock, fsync -> File:sync, dup2 -> dup, ...)</li> 
 <li>If you are unclear about the behaviour of a function you should consult 
 your OS API documentation (e.g. the manpages).</li> 
 <li>If the name is significantly different from the POSIX-function, the 
 underlying function(s) are stated in the documentation.</li> 
 <li>Parameters should reflect those of the C-API, buffer length arguments and  
 by-reference parameters should be omitted for practical purposes.</li> 
 <li>If a C function accepts a bitfield as parameter, it should be translated 
 into lower case string flags representing the flags if the bitfield is the  
 last parameter and also omitting prefixes or suffixes. (e.g.  waitpid 
 (pid, &s, WNOHANG | WUNTRACED) -> waitpid(pid, "nohang", "untraced"),  
 getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) -> 
 Socket:getopt("socket", "reuseaddr"), etc.) </li> 
 <li>If it is not applicable to provide a string representation of the 
 bitfield a bitfield generator helper is provided. It is named FUNCTION_flags. 
 (open("/tmp/test", O_RDONLY | O_NONBLOCK) -> open("/tmp/test", open_flags( 
 "rdonly", "nonblock")))</li>   
 </ul>


</dd>


<dt><a name="Platforms"></a><strong>Platforms</strong></dt>
<dd>
 Platform information. 
 <ul> 
 <li>The minimum platform requirements are a decent POSIX 2001 support. 
 Builds are more or less tested on Linux, Solaris and FreeBSD. Builds for 
 Windows XP SP1 and later can be compiled with MinGW either from Windows 
 itself or using the MinGW cross-compiler. Earlier versions of Windows are not 
 supported.</li> 
 <li>In general all functions which don't have any remarks  
 in their documentation are available on all platforms.</li> 
 <li>Functions with a (POSIX), (Linux) or similar prefix are only available 
 on these specific platforms. Same appplies to parameters of functions 
 with a similar suffix.</li> 
 <li>Some functions might have limitations on some platforms. This should 
 be stated in the documentation. Please also consult your OS API  
 documentation.</li>    
 </ul>


</dd>


<dt><a name="TLS-Crypto"></a><strong>TLS-Crypto</strong></dt>
<dd>
 Cryptography and TLS libraries. 
 <ul> 
 <li>Currently 3 underlying cryptography libraries are supported: openssl, 
 cyassl and axTLS. The name of the library in use is written to  
 <strong>nixio.tls_provider</strong></li> 
 <li>You should whenever possible use openssl or cyassl as axTLS has only  
 limited support. It does not provide support for non-blocking sockets and 
 is probably less audited than the other ones.</li> 
 <li>As the supported Windows versions are not suitable for embedded devices 
 axTLS is at the moment not supported on Windows.</li>   
 </ul>


</dd>


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