sandbox: Add a way to map a file into memory

It is useful to map a file into memory so that it can be accessed using
simple pointers. Add a function to support this.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/os.h b/include/os.h
index 7661078d33..770d76e02f 100644
--- a/include/os.h
+++ b/include/os.h
@@ -406,6 +406,19 @@ int os_write_file(const char *name, const void *buf, int size);
  */
 int os_read_file(const char *name, void **bufp, int *sizep);
 
+/**
+ * os_map_file() - Map a file from the host filesystem into memory
+ *
+ * This can be useful when to provide a backing store for an emulated device
+ *
+ * @pathname:	File pathname to map
+ * @os_flags:	Flags, like OS_O_RDONLY, OS_O_RDWR
+ * @bufp:	Returns buffer containing the file
+ * @sizep:	Returns size of data
+ * Return:	0 if OK, -ve on error
+ */
+int os_map_file(const char *pathname, int os_flags, void **bufp, int *sizep);
+
 /*
  * os_find_text_base() - Find the text section in this running process
  *