libxl: implement destroy for libxl_file_reference builtin type

As well as freeing data any file mappings need to be torn down so
implement an explicit destroy function.

Also the map and unmap function are internal to libxl so make that so.

[PATCH 09 of 16 of
 libxl: autogenerate type definitions and destructor functions]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/tools/libxl/libxl_internal.c b/tools/libxl/libxl_internal.c
index 5eb27a6f4d..05ef3e3130 100644
--- a/tools/libxl/libxl_internal.c
+++ b/tools/libxl/libxl_internal.c
@@ -19,6 +19,12 @@
 #include <stdarg.h>
 #include <string.h>
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
 #include "libxl.h"
 #include "libxl_internal.h"
 #include "libxl_utils.h"
@@ -185,3 +191,48 @@ char *libxl_abs_path(libxl_gc *gc, char *s, const char *path)
     return libxl_sprintf(gc, "%s/%s", path, s);
 }
 
+
+int libxl__file_reference_map(libxl_file_reference *f)
+{
+	struct stat st_buf;
+	int ret, fd;
+	void *data;
+
+	if (f->mapped)
+		return 0;
+
+	fd = open(f->path, O_RDONLY);
+	if (f < 0)
+		return ERROR_FAIL;
+
+	ret = fstat(fd, &st_buf);
+	if (ret < 0)
+		goto out;
+
+	ret = -1;
+	data = mmap(NULL, st_buf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (data == NULL)
+		goto out;
+
+	f->mapped = 1;
+	f->data = data;
+	f->size = st_buf.st_size;
+
+	ret = 0;
+out:
+	close(fd);
+
+	return ret == 0 ? 0 : ERROR_FAIL;
+}
+
+int libxl__file_reference_unmap(libxl_file_reference *f)
+{
+	int ret;
+
+	if (!f->mapped)
+		return 0;
+
+	ret = munmap(f->data, f->size);
+
+	return ret == 0 ? 0 : ERROR_FAIL;
+}