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-rw-r--r--crypto/bio/bio.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/crypto/bio/bio.h b/crypto/bio/bio.h
index 13817925aa..7f49ccbe9d 100644
--- a/crypto/bio/bio.h
+++ b/crypto/bio/bio.h
@@ -169,6 +169,11 @@ extern "C" {
#define BIO_FLAGS_IO_SPECIAL 0x04
#define BIO_FLAGS_RWS (BIO_FLAGS_READ|BIO_FLAGS_WRITE|BIO_FLAGS_IO_SPECIAL)
#define BIO_FLAGS_SHOULD_RETRY 0x08
+#ifndef BIO_FLAGS_UPLINK
+/* "UPLINK" flag denotes file descriptors provided by application.
+ It defaults to 0, as most platforms don't require UPLINK interface. */
+#define BIO_FLAGS_UPLINK 0
+#endif
/* Used in BIO_gethostbyname() */
#define BIO_GHBN_CTRL_HITS 1