[PATCH] uapi: always print valid errors

[James Tucker]

ret_code is now initialized for the case of short reads.
The 0 length reads/eof case is now treated appropriately.

Signed-off-by: James Tucker <jftucker at gmail.com>
---
 src/tools/ipc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/tools/ipc.c b/src/tools/ipc.c
index c8ca431..cc512f3 100644
--- a/src/tools/ipc.c
+++ b/src/tools/ipc.c
@@ -164,7 +164,7 @@ static int userspace_set_device(struct wgdevice *dev)
 	struct wgpeer *peer;
 	size_t len;
 	ssize_t ret;
-	int ret_code;
+	int ret_code = 0;
 	int fd = userspace_interface_fd(dev->interface);
 	if (fd < 0)
 		return fd;
@@ -177,8 +177,10 @@ static int userspace_set_device(struct wgdevice *dev)
 	if (ret < 0)
 		goto out;
 	ret = read(fd, &ret_code, sizeof(ret_code));
-	if (ret < 0)
+	if (ret <= 0) {
+		ret = -errno;
 		goto out;
+	}
 	ret = ret_code;
 out:
 	close(fd);
-- 
2.11.0