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<HTML><HEAD><TITLE>Xlib Programming Manual: X Server Connection Close Operations</TITLE></HEAD><BODY><H1 ALIGN=center>2.6. X Server Connection Close Operations</H1>When the X server's connection to a client is closedeither by an explicit call to<B><A HREF="XCloseDisplay.html">XCloseDisplay()</A></B>or by a process that exits, the X server performs the followingautomatic operations:<UL><P><LI>It disowns all selections owned by the client(see <B><A HREF="../window-information/XSetSelectionOwner.html">XSetSelectionOwner()</A></B>).<P><LI>It performs an<B><A HREF="../input/XUngrabPointer.html">XUngrabPointer()</A></B>and<B><A HREF="../input/XUngrabKeyboard.html">XUngrabKeyboard()</A></B>if the client has actively grabbed the pointer or the keyboard.<P><LI>It performs an<B><A HREF="../window-and-session-manager/XUngrabServer.html">XUngrabServer()</A></B>if the client has grabbed the server.<P><LI>It releases all <A HREF="passive-grabs">passive grabs</a> made by the client. <P><LI>It marks all resources (including colormap entries) allocated by the client either as permanent or temporary, depending on whether the close-down mode is <B>RetainPermanent</B>or<B>RetainTemporary</B>.However, this does not prevent other client applications from explicitlydestroying the resources (see <B><A HREF="XSetCloseDownMode.html">XSetCloseDownMode()</A></B>).</UL><P>When the close-down mode is<B>DestroyAll</B>,the X server destroys all of a client's resources as follows:<UL><P><LI>It examines each window in the client's save-set to determine if it is an inferior(subwindow) of a window created by the client.(The save-set is a list of other clients' windows, which are referred to as save-set windows.)If so, the X server reparents the save-set window to the closest ancestor sothat the save-set window is not an inferior of a window created by the client.The reparenting leaves unchanged the absolute coordinates (with respect tothe root window) of the upper-left outer corner of the save-setwindow.<P><LI>It performs a<B>MapWindow</B>request on the save-set window if the save-set window is unmapped.The X server does this even if the save-set window was not an inferior of a window created by the client.<P><LI>It destroys all windows created by the client.<P><LI>It performs the appropriate free request on each nonwindow resource created bythe client in the server (for example, <A HREF="../graphics/font-metrics/">Font</A>, <A HREF="../pixmap-and-cursor/pixmap.html">Pixmap</A>, <A HREF="../pixmap-and-cursor/cursor.html">Cursor</A>, <A HREF="../color/#colormap">Colormap</A>, and <B><A HREF="../my-own/gcontext.html">GContext</A></B>).<P><LI>It frees all colors and colormap entries allocated by a client application.</UL><P>Additional processing occurs when the last connection to the X server closes.An X server goes through a cycle of having no connections and having someconnections.When the last connection to the X server closes as a result of a connectionclosing with the close_mode of<B>DestroyAll</B>,the X server does the following: <UL><P><LI>It resets its state as if it had just beenstarted. The X server begins by destroying all lingering resources fromclients that have terminated in <B>RetainPermanent</B>or<B>RetainTemporary</B>mode.<P><LI>It deletes all but the predefined atom identifiers.<P><LI>It deletes all properties on all root windows (see section "<A HREF="../window-information/properties-and-atoms.html">Properties and Atoms</A>").<P><LI>It resets all device maps and attributes (for example, key click, bell volume, and acceleration) as well as the access control list.<P><LI>It restores the standard root tiles and cursors.<P><LI>It restores the default font path.<P><LI>It restores the input focus to state<B>PointerRoot</B>.</UL><P>However, the X server does not reset if you close a connection with a close-downmode set to<B>RetainPermanent</B>or<B>RetainTemporary</B>.<H5 ALIGN=right><I>Next: <A HREF="threads.html">Using Xlib With Threads</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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