1 files changed, 26 insertions, 0 deletions
diff --git a/src/nvim/os/stream.c b/src/nvim/os/stream.c
new file mode 100644
index 0000000000..35cb41081d
--- /dev/null
+++ b/src/nvim/os/stream.c
@@ -0,0 +1,26 @@
+// Functions for working with stdio streams (as opposed to RStream/WStream).
+
+#include <stdio.h>
+#include <stdbool.h>
+
+#include <uv.h>
+
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "os/stream.c.generated.h"
+#endif
+
+/// Sets the stream associated with `fd` to "blocking" mode.
+///
+/// @return `0` on success, or `-errno` on failure.
+int stream_set_blocking(int fd, bool blocking)
+{
+  int flags = fcntl(fd, F_GETFL, 0);
+  int err = 0;
+  if (!blocking && !(flags & O_NONBLOCK)) {
+    err = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+  } else if (blocking && (flags & O_NONBLOCK)) {
+    err = fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
+  }
+  return err == -1 ? -errno : 0;
+}
+