From 7eceac758ca08c3feeb77167ee2eb9829b1d93bc Mon Sep 17 00:00:00 2001
From: Tim Newsome <tim@sifive.com>
Date: Wed, 13 Dec 2017 14:32:11 -0800
Subject: [PATCH] Use abstraction because Windows is not POSIX

Fixes #138

Change-Id: I4d9b49762e318fe91f1561ed315829b43daefef4
---
 src/helper/replacements.h         | 11 +++++++++++
 src/jtag/drivers/remote_bitbang.c |  4 ++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/helper/replacements.h b/src/helper/replacements.h
index 1e2fbf20f..f43b7e0f3 100644
--- a/src/helper/replacements.h
+++ b/src/helper/replacements.h
@@ -199,6 +199,17 @@ static inline int close_socket(int sock)
 #endif
 }
 
+static inline void socket_block(int fd)
+{
+#ifdef _WIN32
+	unsigned long nonblock = 0;
+	ioctlsocket(fd, FIONBIO, &nonblock);
+#else
+	int oldopts = fcntl(fd, F_GETFL, 0);
+	fcntl(fd, F_SETFL, oldopts & ~O_NONBLOCK);
+#endif
+}
+
 static inline void socket_nonblock(int fd)
 {
 #ifdef _WIN32
diff --git a/src/jtag/drivers/remote_bitbang.c b/src/jtag/drivers/remote_bitbang.c
index 5e78ccb45..4e1995c0c 100644
--- a/src/jtag/drivers/remote_bitbang.c
+++ b/src/jtag/drivers/remote_bitbang.c
@@ -59,7 +59,7 @@ static int remote_bitbang_buf_full(void)
 /* Read any incoming data, placing it into the buffer. */
 static void remote_bitbang_fill_buf(void)
 {
-	fcntl(remote_bitbang_fd, F_SETFL, O_NONBLOCK);
+	socket_nonblock(remote_bitbang_fd);
 	while (!remote_bitbang_buf_full()) {
 		unsigned contiguous_available_space;
 		if (remote_bitbang_end >= remote_bitbang_start) {
@@ -148,7 +148,7 @@ static int remote_bitbang_rread(void)
 	}
 
 	/* Enable blocking access. */
-	fcntl(remote_bitbang_fd, F_SETFL, 0);
+	socket_block(remote_bitbang_fd);
 	char c;
 	ssize_t count = read(remote_bitbang_fd, &c, 1);
 	if (count == 1) {