Cumulative patch from commit 39b420f7b12b152f879d1bb8a5267b9a838e04dc

39b420f HS 2.0R2: Add parse_cert command for debugging purposes
c0d701a HS 2.0R2: Add OSU client implementation
d2bb2b4 Add os_file_exists()
1cb3eda HS 2.0R2: Add wrapper functions for libcurl
2cb8f96 HS 2.0R2: Add wrapper functions for libxml2
da4ec2c HS 2.0R2: Add wrapper for system browser
db3ca20 HS 2.0R2: Add wrapper for wpadebug browser on Android
2a10e57 HS 2.0R2: Add wrapper for Android browser for user interaction
d0b79d7 HS 2.0R2: Add wrapper functions for WebKit
91728f2 Add wpa_ctrl helper functions for upper level functionality
b4c26ef Clean up hostapd_config_fill() parsers
b2e32cd Fix memory leaks on wpa_config_parse_string() error paths
a0b728b Simplify hostapd_config_fill() error reporting
599f40d Remove extra indentation level from hostapd_config_fill()

Change-Id: I17b7089210da7e083c9fe5814e79cef99bbee80b
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/src/utils/os_unix.c b/src/utils/os_unix.c
index fa67fdf..008ec6b 100644
--- a/src/utils/os_unix.c
+++ b/src/utils/os_unix.c
@@ -407,6 +407,16 @@
 }
 
 
+int os_file_exists(const char *fname)
+{
+	FILE *f = fopen(fname, "rb");
+	if (f == NULL)
+		return 0;
+	fclose(f);
+	return 1;
+}
+
+
 #ifndef WPA_TRACE
 void * os_zalloc(size_t size)
 {