sys/uio: Add preadv/pwritev.

Fixes #18243.

Change-Id: Ib5867f86100430f5e5c43ce4b2d6d561f546cc1e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6068
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

headers/compatibility/bsd/sys/uio.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2023, Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _BSD_SYS_UIO_H_
+#define _BSD_SYS_UIO_H_
+
+
+#include_next <sys/uio.h>
+#include <features.h>
+
+
+#ifdef _DEFAULT_SOURCE
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+static inline ssize_t
+preadv(int fd, const struct iovec *vecs, int count, off_t pos)
+{
+	return readv_pos(fd, pos, vecs, count);
+}
+
+
+static inline ssize_t
+pwritev(int fd, const struct iovec *vecs, int count, off_t pos)
+{
+	return writev_pos(fd, pos, vecs, count);
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif
+
+
+#endif  /* _BSD_SYS_UIO_H_ */