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<h1>dmxprop.c File Reference</h1><code>#include "<a class="el" href="dmx_8h-source.html">dmx.h</a>"</code><br>
<code>#include "<a class="el" href="dmxprop_8h-source.html">dmxprop.h</a>"</code><br>
<code>#include "<a class="el" href="dmxlog_8h-source.html">dmxlog.h</a>"</code><br>
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<tr><td colspan=2><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="dmxprop_8c.html#a0">DMX_ATOMNAME</a> "DMX_NAME"</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="dmxprop_8c.html#a1">DMX_IDENT</a> "Xdmx"</td></tr>
<tr><td colspan=2><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void * </td><td class="memItemRight" valign=bottom><a class="el" href="dmxprop_8c.html#a5">dmxPropertyIterate</a> (<a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> *start, void *(*f)(<a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> *dmxScreen, void *), void *closure)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>int </td><td class="memItemRight" valign=bottom><a class="el" href="dmxprop_8c.html#a8">dmxPropertyDisplay</a> (<a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> *dmxScreen)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>int </td><td class="memItemRight" valign=bottom><a class="el" href="dmxprop_8c.html#a9">dmxPropertySameDisplay</a> (<a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> *dmxScreen, const char *name)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="dmxprop_8c.html#a10">dmxPropertyWindow</a> (<a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> *dmxScreen)</td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
It is possible for one of the DMX "backend displays" to actually be smaller than the dimensions of the backend X server. Therefore, it is possible for more than one of the DMX "backend displays" to be physically located on the same backend X server. This situation must be detected so that cursor motion can be handled in an expected fashion.<p>
We could analyze the names used for the DMX "backend displays" (e.g., the names passed to the -display command-line parameter), but there are many possible names for a single X display, and failing to detect sameness leads to very unexpected results. Therefore, whenever the DMX server opens a window on a backend X server, a property value is queried and set on that backend to detect when another window is already open on that server.<p>
Further, it is possible that two different DMX server instantiations both have windows on the same physical backend X server. This case is also detected so that pointer input is not taken from that particular backend X server.<p>
The routines in this file handle the property management.<hr><h2>Define Documentation</h2>
<a class="anchor" name="a0" doxytag="dmxprop.c::DMX_ATOMNAME" ></a><p>
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<td class="md" nowrap valign="top"> #define DMX_ATOMNAME "DMX_NAME"
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Holds the window id of all DMX windows on the backend X server. </td>
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<td class="md" nowrap valign="top"> #define DMX_IDENT "Xdmx"
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The identification string of this DMX server </td>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="a8" doxytag="dmxprop.c::dmxPropertyDisplay" ></a><p>
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<td class="md" nowrap valign="top"> int dmxPropertyDisplay </td>
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<td class="md" nowrap valign="top"><a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>dmxScreen</em> </td>
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Returns 0 if this is the only Xdmx session on the display; 1 otherwise. </td>
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<td class="md" nowrap valign="top"> void* dmxPropertyIterate </td>
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Starting with the <em>start</em> screen, iterate over all of the screens on the same physical X server as <em>start</em>, calling <em>f</em> with the screen and the <em>closure</em>. (The common case is that <em>start</em> is the only DMX window on the backend X server.) </td>
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<td class="md" nowrap valign="top"> int dmxPropertySameDisplay </td>
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Returns 1 if the dmxScreen and the display in <em>name</em> are on the same display, or 0 otherwise. We can't just compare the display names because there can be multiple synonyms for the same display, some of which cannot be determined without accessing the display itself (e.g., domain aliases or machines with multiple NICs). </td>
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<td class="md" nowrap valign="top"> void dmxPropertyWindow </td>
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<td class="mdname1" valign="top" nowrap> <em>dmxScreen</em> </td>
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Prints a log message if <em>dmxScreen</em> is on the same backend X server as some other DMX backend (output) screen. Modifies the property (<a class="el" href="dmxprop_8c.html#a0">DMX_ATOMNAME</a>) on the backend X server to reflect the creation of <em>dmxScreen</em>.<p>
The root window of the backend X server holds a list of window ids for all DMX windows (on this DMX server or some other DMX server).<p>
This list can then be iterated, and the property for each window can be examined. This property contains the following tuple (no quotes):<p>
"#DMX_IDENT:<hostname running DMX>:<display name of DMX>,<screen number>" </td>
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