[PATCH] gdb: make inferior::terminal a unique ptr

[Simon Marchi <simon.marchi@efficios.com>]

This changes the inferior::terminal field to be a unique pointer, so its
deallocation is automatically managed.

gdb/ChangeLog:

	* inferior.h (struct inferior) <terminal>: Change type to
	gdb::unique_xmalloc_ptr<char>.
	* inferior.c (inferior::~inferior): Don't free inf->terminal.
	* infcmd.c (set_inferior_io_terminal): Don't free terminal
	field, adjust to unique pointer.
	(get_inferior_io_terminal): Adjust to unique pointer.

Change-Id: Iedb6459b4f9eeae812b0cb9d514b5707d5107cdb
---
 gdb/infcmd.c   | 6 ++----
 gdb/inferior.c | 1 -
 gdb/inferior.h | 3 ++-
 3 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index 42b050d3c4e..48d6a91c0c2 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -108,10 +108,8 @@ int stopped_by_random_signal;
 void 
 set_inferior_io_terminal (const char *terminal_name)
 {
-  xfree (current_inferior ()->terminal);
-
   if (terminal_name != NULL && *terminal_name != '\0')
-    current_inferior ()->terminal = xstrdup (terminal_name);
+    current_inferior ()->terminal.reset (xstrdup (terminal_name));
   else
     current_inferior ()->terminal = NULL;
 }
@@ -119,7 +117,7 @@ set_inferior_io_terminal (const char *terminal_name)
 const char *
 get_inferior_io_terminal (void)
 {
-  return current_inferior ()->terminal;
+  return current_inferior ()->terminal.get ();
 }
 
 static void
diff --git a/gdb/inferior.c b/gdb/inferior.c
index 2f4ced0788d..d3bece029dd 100644
--- a/gdb/inferior.c
+++ b/gdb/inferior.c
@@ -79,7 +79,6 @@ inferior::~inferior ()
   discard_all_inferior_continuations (inf);
   inferior_free_data (inf);
   xfree (inf->args);
-  xfree (inf->terminal);
   target_desc_info_free (inf->tdesc_info);
 }
 
diff --git a/gdb/inferior.h b/gdb/inferior.h
index 95af474eede..5002b0b8b3d 100644
--- a/gdb/inferior.h
+++ b/gdb/inferior.h
@@ -52,6 +52,7 @@ struct thread_info;
 #include "symfile-add-flags.h"
 #include "gdbsupport/refcounted-object.h"
 #include "gdbsupport/forward-scope-exit.h"
+#include "gdbsupport/gdb_unique_ptr.h"
 
 #include "gdbsupport/common-inferior.h"
 #include "gdbthread.h"
@@ -456,7 +457,7 @@ class inferior : public refcounted_object
   gdb::unique_xmalloc_ptr<char> cwd;
 
   /* The name of terminal device to use for I/O.  */
-  char *terminal = NULL;
+  gdb::unique_xmalloc_ptr<char> terminal;
 
   /* The terminal state as set by the last target_terminal::terminal_*
      call.  */
-- 
2.27.0