Add portable/uio.h and include it in client/wallet.c

Now that the wallet client uses struct iovec, it needs to include the
relevant header file.  Import the portability layer for possible future
Windows support.

1 files changed, 27 insertions, 0 deletions

diff --git a/portable/uio.h b/portable/uio.h
new file mode 100644
index 0000000..3c9e840
--- /dev/null
+++ b/portable/uio.h
@@ -0,0 +1,27 @@
+/*
+ * Portability wrapper around <sys/uio.h>.
+ *
+ * Provides a definition of the iovec struct for platforms that don't have it
+ * (primarily Windows).  Currently, the corresponding readv and writev
+ * functions are not provided or prototyped here.
+ *
+ * Written by Russ Allbery <rra@stanford.edu>
+ * This work is hereby placed in the public domain by its author.
+ */
+
+#ifndef PORTABLE_UIO_H
+#define PORTABLE_UIO_H 1
+
+#include <sys/types.h>
+
+/* remctl.h provides its own definition of this struct on Windows. */
+#if defined(HAVE_SYS_UIO_H)
+# include <sys/uio.h>
+#elif !defined(REMCTL_H)
+struct iovec {
+    void *iov_base;
+    size_t iov_len;
+};
+#endif
+
+#endif /* !PORTABLE_UIO_H */