Do target_terminal_ours in query & friends instead of in all callers

Any time a caller calls query & friends / prompt_for_continue without
ensuring that gdb owns the terminal for input is a bug.  So do that in
defaulted_query / prompt_for_continue directly instead.

An example of a case where we currently miss calling
target_terminal_ours is internal_error.  Ever since defaulted_query
was made to use gdb_readline_callback, there's no way to answer the
internal error query if the internal error happens while the target is
has the terminal:

  (gdb) c
  Continuing.
  .../src/gdb/linux-nat.c:1676: internal-error: linux_nat_resume: Assertion `dummy_counter < 10' failed.
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Quit this debugging session? (y or n) _

Entering 'y' or 'n' does not work, GDB does not respond.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

	PR gdb/19828
	* gnu-nat.c (inf_validate_task_sc): Don't call
	target_terminal_ours / target_terminal_inferior around query.
	* i386-tdep.c (i386_record_lea_modrm, i386_process_record): Don't
	call target_terminal_ours / target_terminal_inferior around
	yquery.
	* linux-record.c (record_linux_system_call): Don't call
	target_terminal_ours / target_terminal_inferior around yquery.
	* nto-procfs.c (interrupt_query): Don't call target_terminal_ours
	/ target_terminal_inferior around query.
	* record-full.c (record_full_check_insn_num): Remove
	'set_terminal' parameter.  Don't call target_terminal_ours /
	target_terminal_inferior around query.
	(record_full_message, record_full_registers_change)
	(record_full_xfer_partial): Adjust.
	* remote.c (interrupt_query): Don't call target_terminal_ours /
	target_terminal_inferior around query.
	* utils.c (defaulted_query): Install cleanup to restore target
	terminal.  Put target_terminal_ours_for_output in effect while
	defaulted producing, and target_terminal_ours in in effect while
	handling input.
	(prompt_for_continue): Install cleanup to restore target terminal.
	Put target_terminal_ours in in effect while handling input.

1 files changed, 12 insertions, 37 deletions

diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index 4c66edf..a328c18 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -4914,17 +4914,12 @@ i386_record_lea_modrm (struct i386_record_s *irp)
     {
       if (record_full_memory_query)
         {
-	  int q;
-
-          target_terminal_ours ();
-          q = yquery (_("\
+          if (yquery (_("\
 Process record ignores the memory change of instruction at address %s\n\
 because it can't get the value of the segment register.\n\
 Do you want to stop the program?"),
-                      paddress (gdbarch, irp->orig_addr));
-            target_terminal_inferior ();
-            if (q)
-              return -1;
+                      paddress (gdbarch, irp->orig_addr)))
+	    return -1;
         }
 
       return 0;
@@ -5805,16 +5800,11 @@ i386_process_record (struct gdbarch *gdbarch, struct regcache *regcache,
         {
           if (record_full_memory_query)
             {
-	      int q;
-
-              target_terminal_ours ();
-              q = yquery (_("\
+              if (yquery (_("\
 Process record ignores the memory change of instruction at address %s\n\
 because it can't get the value of the segment register.\n\
 Do you want to stop the program?"),
-                          paddress (gdbarch, ir.orig_addr));
-              target_terminal_inferior ();
-              if (q)
+                          paddress (gdbarch, ir.orig_addr)))
                 return -1;
             }
 	}
@@ -6479,16 +6469,11 @@ Do you want to stop the program?"),
               /* addr += ((uint32_t) read_register (I386_ES_REGNUM)) << 4; */
               if (record_full_memory_query)
                 {
-	          int q;
-
-                  target_terminal_ours ();
-                  q = yquery (_("\
+                  if (yquery (_("\
 Process record ignores the memory change of instruction at address %s\n\
 because it can't get the value of the segment register.\n\
 Do you want to stop the program?"),
-                              paddress (gdbarch, ir.orig_addr));
-                  target_terminal_inferior ();
-                  if (q)
+                              paddress (gdbarch, ir.orig_addr)))
                     return -1;
                 }
             }
@@ -7034,17 +7019,12 @@ Do you want to stop the program?"),
 	      {
                 if (record_full_memory_query)
                   {
-	            int q;
-
-                    target_terminal_ours ();
-                    q = yquery (_("\
+                    if (yquery (_("\
 Process record ignores the memory change of instruction at address %s\n\
 because it can't get the value of the segment register.\n\
 Do you want to stop the program?"),
-                                paddress (gdbarch, ir.orig_addr));
-                    target_terminal_inferior ();
-                    if (q)
-                      return -1;
+                                paddress (gdbarch, ir.orig_addr)))
+		      return -1;
                   }
 	      }
 	    else
@@ -7091,16 +7071,11 @@ Do you want to stop the program?"),
 		{
                   if (record_full_memory_query)
                     {
-	              int q;
-
-                      target_terminal_ours ();
-                      q = yquery (_("\
+                      if (yquery (_("\
 Process record ignores the memory change of instruction at address %s\n\
 because it can't get the value of the segment register.\n\
 Do you want to stop the program?"),
-                                  paddress (gdbarch, ir.orig_addr));
-                      target_terminal_inferior ();
-                      if (q)
+                                  paddress (gdbarch, ir.orig_addr)))
                         return -1;
                     }
 		}