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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>BrlAPI's protocol</title>
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<a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="modules.html">Modules</a> <a class="qindex" href="annotated.html">Data Structures</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="functions.html">Data Fields</a> <a class="qindex" href="globals.html">Globals</a> </center>
<hr><h1>BrlAPI's protocol</h1>Instructions and constants for <em>BrlAPI</em> 's protocol.
<a href="#_details">More...</a><table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Defines</h2></td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a4">BRLAPI_MAXPACKETSIZE</a> 512</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a5">BRLPACKET_AUTHKEY</a> 'K'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a6">BRLPACKET_BYE</a> 'B'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a7">BRLPACKET_GETDRIVERID</a> 'd'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a8">BRLPACKET_GETDRIVERNAME</a> 'n'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a9">BRLPACKET_GETDISPLAYSIZE</a> 's'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a10">BRLPACKET_GETTTY</a> 't'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a11">BRLPACKET_LEAVETTY</a> 'L'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a12">BRLPACKET_KEY</a> 'k'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a13">BRLPACKET_COMMAND</a> 'c'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a14">BRLPACKET_MASKKEYS</a> 'm'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a15">BRLPACKET_UNMASKKEYS</a> 'u'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a16">BRLPACKET_WRITE</a> 'W'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a17">BRLPACKET_WRITEDOTS</a> 'D'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a18">BRLPACKET_STATWRITE</a> 'S'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a19">BRLPACKET_GETRAW</a> '*'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a20">BRLPACKET_LEAVERAW</a> '#'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a21">BRLPACKET_PACKET</a> 'p'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a22">BRLPACKET_ACK</a> 'A'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a23">BRLPACKET_ERROR</a> 'E'</td></tr>
<tr><td nowrap align=right valign=top>#define </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a24">BRLRAW_MAGIC</a> (0xdeadbeefL)</td></tr>
<tr><td colspan=2><br><h2>Typedefs</h2></td></tr>
<tr><td nowrap align=right valign=top>typedef uint32_t </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a0">brl_type_t</a></td></tr>
<tr><td colspan=2><br><h2>Functions</h2></td></tr>
<tr><td nowrap align=right valign=top>int </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a2">brlapi_writePacket</a> (int fd, <a class="el" href="group__brlapi__protocol.html#a0">brl_type_t</a> type, const void *buf, size_t size)</td></tr>
<tr><td nowrap align=right valign=top>int </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a3">brlapi_readPacket</a> (int fd, <a class="el" href="group__brlapi__protocol.html#a0">brl_type_t</a> *type, void *buf, size_t size)</td></tr>
<tr><td colspan=2><br><h2>Variables</h2></td></tr>
<tr><td nowrap align=right valign=top>pthread_mutex_t </td><td valign=bottom><a class="el" href="group__brlapi__protocol.html#a1">brlapi_fd_mutex</a></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
These are defines for the protocol between <em>BrlAPI</em> 's server and clients. Understanding is not needed to use the <em>BrlAPI</em> library, so reading this is not needed unless really wanting to connect to <em>BrlAPI</em> without <em>BrlAPI</em> 's library. <hr><h2>Define Documentation</h2>
<a name="a4" doxytag="brlapi.h::BRLAPI_MAXPACKETSIZE"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLAPI_MAXPACKETSIZE 512
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</td>
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</td>
<td>
<p>
Maximum packet size for packets exchanged on sockets and with braille terminal </td>
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<a name="a22" doxytag="brlapi.h::BRLPACKET_ACK"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_ACK 'A'
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Acknowledgement </td>
</tr>
</table>
<a name="a5" doxytag="brlapi.h::BRLPACKET_AUTHKEY"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_AUTHKEY 'K'
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</td>
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</td>
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<p>
Authentication key </td>
</tr>
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<a name="a6" doxytag="brlapi.h::BRLPACKET_BYE"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_BYE 'B'
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Bye </td>
</tr>
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<a name="a13" doxytag="brlapi.h::BRLPACKET_COMMAND"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_COMMAND 'c'
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
braille command </td>
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<a name="a23" doxytag="brlapi.h::BRLPACKET_ERROR"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_ERROR 'E'
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</td>
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<td>
</td>
<td>
<p>
Error in protocol </td>
</tr>
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<a name="a9" doxytag="brlapi.h::BRLPACKET_GETDISPLAYSIZE"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_GETDISPLAYSIZE 's'
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Dimensions of brl display </td>
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<a name="a7" doxytag="brlapi.h::BRLPACKET_GETDRIVERID"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_GETDRIVERID 'd'
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<td>
</td>
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<p>
Ask which driver is used </td>
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<a name="a8" doxytag="brlapi.h::BRLPACKET_GETDRIVERNAME"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_GETDRIVERNAME 'n'
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<td>
</td>
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<p>
Ask which driver is used </td>
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<a name="a19" doxytag="brlapi.h::BRLPACKET_GETRAW"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_GETRAW '*'
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</td>
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<td>
</td>
<td>
<p>
Enter in raw mode </td>
</tr>
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<a name="a10" doxytag="brlapi.h::BRLPACKET_GETTTY"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_GETTTY 't'
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<td>
</td>
<td>
<p>
asks for a specified tty </td>
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<a name="a12" doxytag="brlapi.h::BRLPACKET_KEY"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_KEY 'k'
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
braille key </td>
</tr>
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<a name="a20" doxytag="brlapi.h::BRLPACKET_LEAVERAW"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_LEAVERAW '#'
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
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<p>
Leave raw mode </td>
</tr>
</table>
<a name="a11" doxytag="brlapi.h::BRLPACKET_LEAVETTY"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_LEAVETTY 'L'
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
release the tty </td>
</tr>
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<a name="a14" doxytag="brlapi.h::BRLPACKET_MASKKEYS"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_MASKKEYS 'm'
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
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<p>
Mask a key-range </td>
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<a name="a21" doxytag="brlapi.h::BRLPACKET_PACKET"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_PACKET 'p'
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<table cellspacing=5 cellpadding=0 border=0>
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</td>
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<p>
Raw packets </td>
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<a name="a18" doxytag="brlapi.h::BRLPACKET_STATWRITE"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_STATWRITE 'S'
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
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<p>
Write Status Cells </td>
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<a name="a15" doxytag="brlapi.h::BRLPACKET_UNMASKKEYS"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_UNMASKKEYS 'u'
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
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<p>
Unmask key range </td>
</tr>
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<a name="a16" doxytag="brlapi.h::BRLPACKET_WRITE"></a><p>
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_WRITE 'W'
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
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<p>
Write On Braille Display </td>
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<a name="a17" doxytag="brlapi.h::BRLPACKET_WRITEDOTS"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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<td class="md">
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<td class="md" nowrap valign="top"> #define BRLPACKET_WRITEDOTS 'D'
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Write Dots On Braille Display </td>
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<a name="a24" doxytag="brlapi.h::BRLRAW_MAGIC"></a><p>
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<td class="md" nowrap valign="top"> #define BRLRAW_MAGIC (0xdeadbeefL)
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<p>
Magic number to give when sending a BRLPACKET_GETRAW packet </td>
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<hr><h2>Typedef Documentation</h2>
<a name="a0" doxytag="brlapi.h::brl_type_t"></a><p>
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<td class="md" nowrap valign="top"> typedef uint32_t brl_type_t
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<p>
type for packet type. Only unsigned can cross networks, 32bits </td>
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<hr><h2>Function Documentation</h2>
<a name="a3" doxytag="brlapi.h::brlapi_readPacket"></a><p>
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<td class="md" nowrap valign="top"> int brlapi_readPacket </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname" nowrap> <em>fd</em>, </td>
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<td></td>
<td></td>
<td class="md" nowrap><a class="el" href="group__brlapi__protocol.html#a0">brl_type_t</a> * </td>
<td class="mdname" nowrap> <em>type</em>, </td>
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<td></td>
<td></td>
<td class="md" nowrap>void * </td>
<td class="mdname" nowrap> <em>buf</em>, </td>
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<td></td>
<td></td>
<td class="md" nowrap>size_t </td>
<td class="mdname" nowrap> <em>size</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
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<p>
Read a packet from <em>BrlAPI</em> server
<p>
This function is for internal use, but one might use it if one really knows what one is doing...
<p>
<em>type</em> is where the function will store the packet type; it should always be one of the above defined BRLPACKET_* (or else something very nasty must have happened :/).
<p>
The syntax is the same as read()'s.
<p>
<dl compact><dt><b>Returns: </b></dt><dd>
packet's size, -2 if <code>EOF</code> occurred, -1 on error </dl> </td>
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<a name="a2" doxytag="brlapi.h::brlapi_writePacket"></a><p>
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<td class="md" nowrap valign="top"> int brlapi_writePacket </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname" nowrap> <em>fd</em>, </td>
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<td></td>
<td></td>
<td class="md" nowrap><a class="el" href="group__brlapi__protocol.html#a0">brl_type_t</a> </td>
<td class="mdname" nowrap> <em>type</em>, </td>
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<td class="md" nowrap>const void * </td>
<td class="mdname" nowrap> <em>buf</em>, </td>
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<td></td>
<td class="md" nowrap>size_t </td>
<td class="mdname" nowrap> <em>size</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
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<p>
Send a packet to <em>BrlAPI</em> server
<p>
This function is for internal use, but one might use it if one really knows what one is doing...
<p>
<em>type</em> should only be one of the above defined BRLPACKET_*.
<p>
The syntax is the same as write()'s.
<p>
<dl compact><dt><b>Returns: </b></dt><dd>
0 on success, -1 on failure </dl> </td>
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<hr><h2>Variable Documentation</h2>
<a name="a1" doxytag="brlapi.h::brlapi_fd_mutex"></a><p>
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<td class="md" nowrap valign="top"> pthread_mutex_t brlapi_fd_mutex
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<p>
Mutex for protecting concurrent fd access
<p>
In order to regulate concurrent access to the library's file descriptor and requests to / answers from <em>BrlAPI</em> server, every function of the library locks this mutex, namely
<p>
<ul>
<li><a class="el" href="group__brlapi__connection.html#a0">brlapi_initializeConnection()</a><li><a class="el" href="group__brlapi__connection.html#a1">brlapi_closeConnection()</a><li><a class="el" href="group__brlapi__raw.html#a0">brlapi_getRaw()</a><li><a class="el" href="group__brlapi__raw.html#a1">brlapi_leaveRaw()</a><li><a class="el" href="group__brlapi__raw.html#a2">brlapi_sendRaw()</a><li><a class="el" href="group__brlapi__raw.html#a3">brlapi_recvRaw()</a><li><a class="el" href="group__brlapi__info.html#a0">brlapi_getDriverId()</a><li><a class="el" href="group__brlapi__info.html#a1">brlapi_getDriverName()</a><li><a class="el" href="group__brlapi__info.html#a2">brlapi_getDisplaySize()</a><li><a class="el" href="group__brlapi__tty.html#a0">brlapi_getTty()</a><li><a class="el" href="group__brlapi__tty.html#a1">brlapi_leaveTty()</a><li>brlapi_write*()<li>brlapi_(un)?ignorekeys()<li>brlapi_read*()</ul>
If both these functions and <a class="el" href="group__brlapi__protocol.html#a2">brlapi_writePacket()</a> or <a class="el" href="group__brlapi__protocol.html#a3">brlapi_readPacket()</a> are used in a multithreaded application, this mutex must be locked before calling <a class="el" href="group__brlapi__protocol.html#a2">brlapi_writePacket()</a> or <a class="el" href="group__brlapi__protocol.html#a3">brlapi_readPacket()</a>, and unlocked afterwards. </td>
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