1 files changed, 49 insertions, 0 deletions
diff --git a/gdbsupport/scoped_mmap.c b/gdbsupport/scoped_mmap.c
new file mode 100644
index 00000000000..6b424dc0545
--- /dev/null
+++ b/gdbsupport/scoped_mmap.c
@@ -0,0 +1,49 @@
+/* scoped_mmap, automatically unmap files
+
+   Copyright (C) 2018-2020 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/>.  */
+
+#include "common-defs.h"
+#include "scoped_mmap.h"
+#include "scoped_fd.h"
+#include "gdbsupport/filestuff.h"
+
+#ifdef HAVE_SYS_MMAN_H
+
+scoped_mmap
+mmap_file (const char *filename)
+{
+  scoped_fd fd (gdb_open_cloexec (filename, O_RDONLY, 0));
+  if (fd.get () < 0)
+    perror_with_name (("open"));
+
+  off_t size = lseek (fd.get (), 0, SEEK_END);
+  if (size < 0)
+    perror_with_name (("lseek"));
+
+  /* We can't map an empty file.  */
+  if (size == 0)
+    error (_("file to mmap is empty"));
+
+  scoped_mmap mmapped_file (nullptr, size, PROT_READ, MAP_PRIVATE, fd.get (), 0);
+  if (mmapped_file.get () == MAP_FAILED)
+    perror_with_name (("mmap"));
+
+  return mmapped_file;
+}
+
+#endif /* HAVE_SYS_MMAN_H */