gdb/

* cli/cli-decode.c (add_setshow_zuinteger_unlimited_cmd): New.
	Update comment to add_setshow_integer_cmd.
	* cli/cli-setshow.c (do_set_command): Handle case
	'var_zuinteger_unlimited'.
	(do_show_command): Likewise.
	* cli/cli-cmds.c (init_cmds): Call add_setshow_zuinteger_unlimited_cmd
	for command 'remotetimeout'.
	* command.h (enum var_types): New zuinteger_unlimited.  Update comment
	to var_integer.
	* source.c (_initialize_source): Call add_setshow_zuinteger_unlimited_cmd
	for command 'set listsize'.

gdb/doc/
	* gdb.texinfo (List): Describe the meaning of 0 and -1 in
	'set listsize'.

gdb/testsuite/
	* gdb.base/list.exp (set_listsize): Don't set arg to "unlimited"
	when it is less than 0.

gdb/ChangeLog

@@ -1,3 +1,17 @@
+2012-09-17  Yao Qi  <yao@codesourcery.com>
+
+	* cli/cli-decode.c (add_setshow_zuinteger_unlimited_cmd): New.
+	Update comment to add_setshow_integer_cmd.
+	* cli/cli-setshow.c (do_set_command): Handle case
+	'var_zuinteger_unlimited'.
+	(do_show_command): Likewise.
+	* cli/cli-cmds.c (init_cmds): Call add_setshow_zuinteger_unlimited_cmd
+	for command 'remotetimeout'.
+	* command.h (enum var_types): New zuinteger_unlimited.  Update comment
+	to var_integer.
+	* source.c (_initialize_source): Call add_setshow_zuinteger_unlimited_cmd
+	for command 'set listsize'.
+
 2012-09-17  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
 	* infrun.c (restore_infcall_suspend_state): Eliminate single-use

gdb/cli/cli-cmds.c

@@ -1826,7 +1826,8 @@ is displayed."),
 			    show_remote_debug,
 			    &setdebuglist, &showdebuglist);
 
-  add_setshow_integer_cmd ("remotetimeout", no_class, &remote_timeout, _("\
+  add_setshow_zuinteger_unlimited_cmd ("remotetimeout", no_class,
+				       &remote_timeout, _("\
 Set timeout limit to wait for target to respond."), _("\
 Show timeout limit to wait for target to respond."), _("\
 This value is used to set the time limit for gdb to wait for a response\n\

gdb/cli/cli-decode.c

@@ -632,7 +632,8 @@ add_setshow_optional_filename_cmd (char *name, enum command_class class,
 /* Add element named NAME to both the set and show command LISTs (the
    list for set/show or some sublist thereof).  CLASS is as in
    add_cmd.  VAR is address of the variable which will contain the
-   value.  SET_DOC and SHOW_DOC are the documentation strings.  */
+   value.  SET_DOC and SHOW_DOC are the documentation strings.  This
+   function is only used in Python API.  Please don't use it elsewhere.  */
 void
 add_setshow_integer_cmd (char *name, enum command_class class,
 			 int *var,
@@ -692,6 +693,25 @@ add_setshow_zinteger_cmd (char *name, enum command_class class,
 			NULL, NULL);
 }
 
+void
+add_setshow_zuinteger_unlimited_cmd (char *name,
+				     enum command_class class,
+				     unsigned int *var,
+				     const char *set_doc,
+				     const char *show_doc,
+				     const char *help_doc,
+				     cmd_sfunc_ftype *set_func,
+				     show_value_ftype *show_func,
+				     struct cmd_list_element **set_list,
+				     struct cmd_list_element **show_list)
+{
+  add_setshow_cmd_full (name, class, var_zuinteger_unlimited, var,
+			set_doc, show_doc, help_doc,
+			set_func, show_func,
+			set_list, show_list,
+			NULL, NULL);
+}
+
 /* Add element named NAME to both the set and show command LISTs (the
    list for set/show or some sublist thereof).  CLASS is as in
    add_cmd.  VAR is address of the variable which will contain the

gdb/cli/cli-setshow.c

@@ -379,6 +379,26 @@ do_set_command (char *arg, int from_tty, struct cmd_list_element *c)
 	  }
       }
       break;
+    case var_zuinteger_unlimited:
+      {
+	LONGEST val;
+
+	if (arg == NULL)
+	  error_no_arg (_("integer to set it to."));
+	val = parse_and_eval_long (arg);
+
+	if (val >= INT_MAX)
+	  error (_("integer %s out of range"), plongest (val));
+	else if (val < -1)
+	  error (_("only -1 is allowed to set as unlimited"));
+
+	if (*(int *) c->var != val)
+	  {
+	    *(int *) c->var = val;
+	    option_changed = 1;
+	  }
+      }
+      break;
     default:
       error (_("gdb internal error: bad var_type in do_setshow_command"));
     }
@@ -478,6 +498,7 @@ do_set_command (char *arg, int from_tty, struct cmd_list_element *c)
 	  break;
 	case var_integer:
 	case var_zinteger:
+	case var_zuinteger_unlimited:
 	  {
 	    char s[64];
 
@@ -562,7 +583,14 @@ do_show_command (char *arg, int from_tty, struct cmd_list_element *c)
       else
 	fprintf_filtered (stb, "%d", *(int *) c->var);
       break;
-
+    case var_zuinteger_unlimited:
+      {
+	if (*(int *) c->var == -1)
+	  fputs_filtered ("unlimited", stb);
+	else
+	  fprintf_filtered (stb, "%u", *(int *) c->var);
+      }
+      break;
     default:
       error (_("gdb internal error: bad var_type in do_show_command"));
     }

gdb/command.h

@@ -77,7 +77,8 @@ typedef enum var_types
 
     /* Like var_uinteger but signed.  *VAR is an int.  The user can
        type 0 to mean "unlimited", which is stored in *VAR as
-       INT_MAX.  */
+       INT_MAX.  The only remaining use of it is the Python API.
+       Don't use it elsewhere.  */
     var_integer,
 
     /* String which the user enters with escapes (e.g. the user types
@@ -99,6 +100,9 @@ typedef enum var_types
     /* ZeroableUnsignedInteger.  *VAR is an unsigned int.  Zero really
        means zero.  */
     var_zuinteger,
+    /* ZeroableUnsignedInteger with unlimited value.  *VAR is an unsigned
+       int, but its range is [0, INT_MAX].  -1 stands for unlimited.  */
+    var_zuinteger_unlimited,
     /* Enumerated type.  Can only have one of the specified values.
        *VAR is a char pointer to the name of the element that we
        find.  */
@@ -354,6 +358,18 @@ extern void add_setshow_zuinteger_cmd (char *name,
 				       struct cmd_list_element **set_list,
 				       struct cmd_list_element **show_list);
 
+extern void
+  add_setshow_zuinteger_unlimited_cmd (char *name,
+				       enum command_class class,
+				       unsigned int *var,
+				       const char *set_doc,
+				       const char *show_doc,
+				       const char *help_doc,
+				       cmd_sfunc_ftype *set_func,
+				       show_value_ftype *show_func,
+				       struct cmd_list_element **set_list,
+				       struct cmd_list_element **show_list);
+
 /* Do a "show" command for each thing on a command list.  */
 
 extern void cmd_show_list (struct cmd_list_element *, int, char *);

gdb/doc/ChangeLog

@@ -1,3 +1,8 @@
+2012-09-17  Yao Qi  <yao@codesourcery.com>
+
+	* gdb.texinfo (List): Describe the meaning of 0 and -1 in
+	'set listsize'.
+
 2012-09-13  Jan Kratochvil  <jan.kratochvil@redhat.com>
 	    Eli Zaretskii  <eliz@gnu.org>
 

gdb/doc/gdb.texinfo

@@ -6706,6 +6706,8 @@ the @code{list} command.  You can change this using @code{set listsize}:
 @item set listsize @var{count}
 Make the @code{list} command display @var{count} source lines (unless
 the @code{list} argument explicitly specifies some other number).
+Setting @var{count} to -1 means there's no limit and 0 means suppress
+display of source lines.
 
 @kindex show listsize
 @item show listsize

gdb/source.c

@@ -1965,11 +1965,11 @@ The matching line number is also stored as the value of \"$_\"."));
       add_com_alias ("?", "reverse-search", class_files, 0);
     }
 
-  add_setshow_integer_cmd ("listsize", class_support, &lines_to_list, _("\
+  add_setshow_zuinteger_unlimited_cmd ("listsize", class_support,
+				       &lines_to_list, _("\
 Set number of source lines gdb will list by default."), _("\
 Show number of source lines gdb will list by default."), NULL,
-			    NULL,
+				       NULL, show_lines_to_list,
-			    show_lines_to_list,
 				       &setlist, &showlist);
 
   add_cmd ("substitute-path", class_files, set_substitute_path_command,

gdb/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2012-09-17  Yao Qi  <yao@codesourcery.com>
+
+	* gdb.base/list.exp (set_listsize): Don't set arg to "unlimited"
+	when it is less than 0.
+
 2012-09-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	PR 14119

gdb/testsuite/gdb.base/list.exp

@@ -62,7 +62,7 @@ proc set_listsize { arg } {
     if [gdb_test "set listsize $arg" ".*" "setting listsize to $arg #$set_listsize_count"] {
 	return 0;
     }
-    if { $arg <= 0 } {
+    if { $arg < 0 } {
 	set arg "unlimited";
     }