[rfa/doc] Add section on interrupts to remote protocol documentation

[Kevin Buettner <kevinb@redhat.com>]

The patch below adds a new section about interrupts to the remote protocol
documentation.  A discussion on gdb@ may be found starting here:

    http://sources.redhat.com/ml/gdb/2005-11/msg00347.html

Okay?

	* gdb.texinfo (set remotebreak): Add anchor.
	(Remote Protocol): Add new section `Interrupts'.

Index: gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.293
diff -u -p -r1.293 gdb.texinfo
--- gdb.texinfo	17 Nov 2005 19:08:38 -0000	1.293
+++ gdb.texinfo	18 Nov 2005 02:44:52 -0000
@@ -12147,6 +12147,7 @@ Show the current speed of the remote con
 @item set remotebreak
 @cindex interrupt remote programs
 @cindex BREAK signal instead of Ctrl-C
+@anchor{set remotebreak}
 If set to on, @value{GDBN} sends a @code{BREAK} signal to the remote
 when you press the @key{Ctrl-C} key to interrupt the program running
 on the remote.  If set to off, @value{GDBN} sends the @samp{Ctrl-C}
@@ -22016,6 +22017,7 @@ Show the current setting of the target w
 * Stop Reply Packets::
 * General Query Packets::
 * Register Packet Format::
+* Interrupts::
 * Examples::
 * File-I/O remote protocol extension::
 @end menu
@@ -23063,6 +23065,27 @@ as @code{MIPS32}.
 
 @end table
 
+@node Interrupts
+@section Interrupts
+
+When a program on the remote target is running, @value{GDBN} may
+attempt to interrupt it by sending a @samp{Ctrl-C} or a @code{BREAK},
+control of which is specified via @value{GDBN}'s @samp{remotebreak}
+setting.  @xref{set remotebreak}.  The precise meaning of @code{BREAK}
+is defined by the transport mechanism and may, in fact, be undefined. 
+@samp{Ctrl-C}, on the other hand, is defined and implemented for all
+transport mechanisms and is represented by sending the single byte
+@code{0x03}.  @samp{Ctrl-C} must not be sent as part of a packet as
+defined in the Overview section.  @xref{Overview}.
+
+Stubs are not required to recognize these interrupt mechanisms and the
+precise meaning associated with receipt of the interrupt is
+implementation defined.  If the stub is successful at interrupting the
+running program, it is expected that it will send one of the Stop
+Reply Packets (@xref{Stop Reply Packets}) to @value{GDBN} as a result
+of successfully stopping the program.  Interrupts received while the
+program is stopped will be discarded.
+
 @node Examples
 @section Examples