gdbsupport: move gdb_file_up to its own file

The following patches wants to change gdb_fopen_cloexec and
gdb_mkostemp_cloexec to return a scoped_fd.  Doing this causes a cyclic
include between scoped_fd.h and filestuff.h, that both want to include
each other.  scoped_fd.h includes filestuff.h because of the
scoped_fd::to_file method's return value.  filestuff.h would then
include scoped_fd.h for gdb_fopen_cloexec's and gdb_mkostemp_cloexec's
return values.

To fix that, move gdb_file_up to its own file, gdb_file.h.

Change-Id: Ic82a48914b2aacee8f14af535b7469245f88b93d

3 files changed, 39 insertions, 13 deletions

diff --git a/gdbsupport/filestuff.h b/gdbsupport/filestuff.h
index 7f4cfb2..aa15f89 100644
--- a/gdbsupport/filestuff.h
+++ b/gdbsupport/filestuff.h
@@ -21,6 +21,7 @@
 
 #include <dirent.h>
 #include <fcntl.h>
+#include "gdb_file.h"
 
 /* Note all the file descriptors which are open when this is called.
    These file descriptors will not be closed by close_most_fds.  */
@@ -69,18 +70,6 @@ gdb_open_cloexec (const std::string &filename, int flags,
   return gdb_open_cloexec (filename.c_str (), flags, mode);
 }
 
-struct gdb_file_deleter
-{
-  void operator() (FILE *file) const
-  {
-    fclose (file);
-  }
-};
-
-/* A unique pointer to a FILE.  */
-
-typedef std::unique_ptr<FILE, gdb_file_deleter> gdb_file_up;
-
 /* Like 'fopen', but ensures that the returned file descriptor has the
    close-on-exec flag set.  */
 
diff --git a/gdbsupport/gdb_file.h b/gdbsupport/gdb_file.h
new file mode 100644
index 0000000..2f5b399
--- /dev/null
+++ b/gdbsupport/gdb_file.h
@@ -0,0 +1,37 @@
+/* gdb_file_up, an RAII wrapper around FILE.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef GDBSUPPORT_GDB_FILE
+#define GDBSUPPORT_GDB_FILE
+
+#include <memory>
+#include <stdio.h>
+
+struct gdb_file_deleter
+{
+  void operator() (FILE *file) const
+  {
+    fclose (file);
+  }
+};
+
+/* A unique pointer to a FILE.  */
+
+typedef std::unique_ptr<FILE, gdb_file_deleter> gdb_file_up;
+
+#endif
diff --git a/gdbsupport/scoped_fd.h b/gdbsupport/scoped_fd.h
index a1aad84..f16e811 100644
--- a/gdbsupport/scoped_fd.h
+++ b/gdbsupport/scoped_fd.h
@@ -21,7 +21,7 @@
 #define COMMON_SCOPED_FD_H
 
 #include <unistd.h>
-#include "filestuff.h"
+#include "gdb_file.h"
 
 /* A smart-pointer-like class to automatically close a file descriptor.  */