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99 lines
5.0 KiB
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<HTML><HEAD><TITLE>Tk Built-In Commands - send manual page</TITLE></HEAD><BODY>
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<DL>
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<DD><A HREF="send.htm#M2" NAME="L1035">NAME</A>
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<DL><DD>send - Execute a command in a different application</DL>
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<DD><A HREF="send.htm#M3" NAME="L1036">SYNOPSIS</A>
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<DL>
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<DD><B>send ?</B><I>options</I>? <I>app cmd </I>?<I>arg arg ...</I>?
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</DL>
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<DD><A HREF="send.htm#M4" NAME="L1037">DESCRIPTION</A>
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<DL>
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<DD><A HREF="send.htm#M5" NAME="L1038"><B>-async</B></A>
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<DD><A HREF="send.htm#M6" NAME="L1039"><B>-displayof</B> <I>pathName</I></A>
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<DD><A HREF="send.htm#M7" NAME="L1040"><B>- -</B></A>
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</DL>
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<DD><A HREF="send.htm#M8" NAME="L1041">APPLICATION NAMES</A>
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<DD><A HREF="send.htm#M9" NAME="L1042">DISABLING SENDS</A>
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<DD><A HREF="send.htm#M10" NAME="L1043">SECURITY</A>
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<DD><A HREF="send.htm#M11" NAME="L1044">KEYWORDS</A>
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</DL><HR>
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<H3><A NAME="M2">NAME</A></H3>
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send - Execute a command in a different application
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<H3><A NAME="M3">SYNOPSIS</A></H3>
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<B>send ?</B><I>options</I>? <I>app cmd </I>?<I>arg arg ...</I>?<BR>
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<H3><A NAME="M4">DESCRIPTION</A></H3>
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This command arranges for <I>cmd</I> (and <I>arg</I>s) to be executed in the
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application named by <I>app</I>. It returns the result or
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error from that command execution.
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<I>App</I> may be the name of any application whose main window is
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on the display containing the sender's main window; it need not
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be within the same process.
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If no <I>arg</I> arguments are present, then the command to be executed is
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contained entirely within the <I>cmd</I> argument. If one or
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more <I>arg</I>s are present, they are concatenated to form the
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command to be executed, just as for the <B><A HREF="../TkCmd/eval.htm">eval</A></B> command.
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<P>
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If the initial arguments of the command begin with ``-''
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they are treated as options. The following options are
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currently defined:
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<P>
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<DL>
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<P><DT><A NAME="M5"><B>-async</B></A><DD>
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Requests asynchronous invocation. In this case the <B>send</B>
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command will complete immediately without waiting for <I>cmd</I>
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to complete in the target application; no result will be available
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and errors in the sent command will be ignored.
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If the target application is in the same process as the sending
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application then the <B>-async</B> option is ignored.
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<P><DT><A NAME="M6"><B>-displayof</B> <I>pathName</I></A><DD>
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Specifies that the target application's main window is on the display
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of the window given by <I>pathName</I>, instead of the display containing
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the application's main window.
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<P><DT><A NAME="M7"><B>- -</B></A><DD>
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Serves no purpose except to terminate the list of options. This
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option is needed only if <I>app</I> could contain a leading ``-''
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character.
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<P></DL>
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<H3><A NAME="M8">APPLICATION NAMES</A></H3>
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The name of an application is set initially from the name of the
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program or script that created the application.
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You can query and change the name of an application with the
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<B><A HREF="../TclCmd/tk.htm">tk appname</A></B> command.
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<H3><A NAME="M9">DISABLING SENDS</A></H3>
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If the <B>send</B> command is removed from an application (e.g.
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with the command <B>rename send {}</B>) then the application
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will not respond to incoming send requests anymore, nor will it
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be able to issue outgoing requests.
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Communication can be reenabled by invoking the <B><A HREF="../TclCmd/tk.htm">tk appname</A></B>
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command.
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<H3><A NAME="M10">SECURITY</A></H3>
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The <B>send</B> command is potentially a serious security loophole. On Unix,
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any application that can connect to your X server can send
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scripts to your applications.
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These incoming scripts can use Tcl to read and
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write your files and invoke subprocesses under your name.
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Host-based access control such as that provided by <B>xhost</B>
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is particularly insecure, since it allows anyone with an account
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on particular hosts to connect to your server, and if disabled it
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allows anyone anywhere to connect to your server.
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In order to provide at least a small amount of
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security, Tk checks the access control being used by the server
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and rejects incoming sends unless (a) <B>xhost</B>-style access control
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is enabled (i.e. only certain hosts can establish connections) and (b) the
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list of enabled hosts is empty.
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This means that applications cannot connect to your server unless
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they use some other form of authorization
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such as that provide by <B>xauth</B>.
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Under Windows, <B>send</B> is currently disabled. Most of the
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functionality is provided by the <B><A HREF="../TkCmd/dde.htm">dde</A></B> command instead.
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<H3><A NAME="M11">KEYWORDS</A></H3>
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<A href="../Keywords/A.htm#application">application</A>, <A href="../Keywords/D.htm#dde">dde</A>, <A href="../Keywords/N.htm#name">name</A>, <A href="../Keywords/R.htm#remote execution">remote execution</A>, <A href="../Keywords/S.htm#security">security</A>, <A href="../Keywords/S.htm#send">send</A>
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<HR><PRE>
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<A HREF="../copyright.htm">Copyright</A> © 1990-1994 The Regents of the University of California.
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<A HREF="../copyright.htm">Copyright</A> © 1994-1996 Sun Microsystems, Inc.
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<A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE>
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</BODY></HTML>
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