Constify thread name return path

Since this code path returns a string owned by the target (we don't know how
it's allocated, could be a static read-only string), it's safer if we return
a constant string.  If, for some reasons, the caller wishes to modify the
string, it should make itself a copy.

gdb/ChangeLog:

	* linux-nat.c (linux_nat_thread_name): Constify return value.
	* target.h (struct target_ops) <to_thread_name>: Likewise.
	(target_thread_name): Likewise.
	* target.c (target_thread_name): Likewise.
	* target-delegates.c (debug_thread_name): Regenerate.
	* python/py-infthread.c (thpy_get_name): Constify local variables.
	* thread.c (print_thread_info): Likewise.
	(thread_find_command): Likewise.

1 files changed, 5 insertions, 5 deletions

diff --git a/gdb/target-delegates.c b/gdb/target-delegates.c
index 253c9d7..b41b316 100644
--- a/gdb/target-delegates.c
+++ b/gdb/target-delegates.c
@@ -1530,23 +1530,23 @@ debug_extra_thread_info (struct target_ops *self, struct thread_info *arg1)
   return result;
 }
 
-static char *
+static const char *
 delegate_thread_name (struct target_ops *self, struct thread_info *arg1)
 {
   self = self->beneath;
   return self->to_thread_name (self, arg1);
 }
 
-static char *
+static const char *
 tdefault_thread_name (struct target_ops *self, struct thread_info *arg1)
 {
   return NULL;
 }
 
-static char *
+static const char *
 debug_thread_name (struct target_ops *self, struct thread_info *arg1)
 {
-  char * result;
+  const char * result;
   fprintf_unfiltered (gdb_stdlog, "-> %s->to_thread_name (...)\n", debug_target.to_shortname);
   result = debug_target.to_thread_name (&debug_target, arg1);
   fprintf_unfiltered (gdb_stdlog, "<- %s->to_thread_name (", debug_target.to_shortname);
@@ -1554,7 +1554,7 @@ debug_thread_name (struct target_ops *self, struct thread_info *arg1)
   fputs_unfiltered (", ", gdb_stdlog);
   target_debug_print_struct_thread_info_p (arg1);
   fputs_unfiltered (") = ", gdb_stdlog);
-  target_debug_print_char_p (result);
+  target_debug_print_const_char_p (result);
   fputs_unfiltered ("\n", gdb_stdlog);
   return result;
 }