GDB: Document the unix::/path/to/socket of remote connection.

gdb/doc:
* gdb.texinfo (Connecting)[Remote Connection Commands]:  Provide alternative
  unix::/tmp/xxx example.  Include @code{unix::@var{local-socket}} in
  the list of remote and extended-remote syntaxes.

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index eb00eaa..9616d37 100644 (file)
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -20829,6 +20829,15 @@ Note that this command has the same form as the command to connect
 to a serial line.  @value{GDBN} will automatically determine which
 kind of file you have specified and will make the appropriate kind
 of connection.
+The above command is identical to the command:
+
+@smallexample
+target remote unix::/tmp/gdb-socket1
+@end smallexample
+@noindent
+
+See below for the explanation of this syntax.
+
 This feature is not available if the host system does not support
 Unix domain sockets.
 
@@ -20839,6 +20848,7 @@ Unix domain sockets.
 @itemx target remote @code{tcp4:@var{host}:@var{port}}
 @itemx target remote @code{tcp6:@var{host}:@var{port}}
 @itemx target remote @code{tcp6:@var{[host]}:@var{port}}
+@itemx target remote @code{unix::@var{local-socket}}
 @itemx target extended-remote @code{@var{host}:@var{port}}
 @itemx target extended-remote @code{@var{[host]}:@var{port}}
 @itemx target extended-remote @code{tcp:@var{host}:@var{port}}
@@ -20846,8 +20856,10 @@ Unix domain sockets.
 @itemx target extended-remote @code{tcp4:@var{host}:@var{port}}
 @itemx target extended-remote @code{tcp6:@var{host}:@var{port}}
 @itemx target extended-remote @code{tcp6:@var{[host]}:@var{port}}
+@itemx target extended-remote @code{unix::@var{local-socket}}
 @cindex @acronym{TCP} port, @code{target remote}
-Debug using a @acronym{TCP} connection to @var{port} on @var{host}.
+Debug using a @acronym{TCP} connection to @var{port} on @var{host}
+or using the Unix domain socket @var{local-socket} on the local machine.
 The @var{host} may be either a host name, a numeric @acronym{IPv4}
 address, or a numeric @acronym{IPv6} address (with or without the
 square brackets to separate the address from the port); @var{port}
@@ -20895,6 +20907,16 @@ target remote :1234
 @noindent
 
 Note that the colon is still required here.
+Alternatively you can use a Unix domain socket:
+
+@smallexample
+target remote unix::/tmp/gdb-socket1
+@end smallexample
+@noindent
+
+This has the advantage that it'll not fail if the port number is already
+in use.
+
 
 @item target remote @code{udp:@var{host}:@var{port}}
 @itemx target remote @code{udp:@var{[host]}:@var{port}}