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.

3 files changed, 55 insertions, 6 deletions

diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index d3473d51959..2e988045d0f 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -1826,14 +1826,15 @@ 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\
 from the target."),
-			   NULL,
-			   show_remote_timeout,
-			   &setlist, &showlist);
+				       NULL,
+				       show_remote_timeout,
+				       &setlist, &showlist);
 
   add_prefix_cmd ("debug", no_class, set_debug,
 		  _("Generic command for setting gdb debugging flags"),
diff --git a/gdb/cli/cli-decode.c b/gdb/cli/cli-decode.c
index 4752a829ed5..6e0f0dee477 100644
--- a/gdb/cli/cli-decode.c
+++ b/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
diff --git a/gdb/cli/cli-setshow.c b/gdb/cli/cli-setshow.c
index 89e095a953e..9d8cb2ea51e 100644
--- a/gdb/cli/cli-setshow.c
+++ b/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"));
     }