some new features

.venv/lib/python3.12/site-packages/Cython/Includes/posix/uio.pxd

@@ -0,0 +1,26 @@
+# https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_uio.h.html
+
+from posix.types cimport off_t
+
+
+cdef extern from "<sys/uio.h>" nogil:
+
+    cdef struct iovec:
+        void  *iov_base
+        size_t iov_len
+
+    ssize_t readv (int fd, const iovec *iov, int iovcnt)
+    ssize_t writev(int fd, const iovec *iov, int iovcnt)
+
+    # Linux-specific, https://man7.org/linux/man-pages/man2/readv.2.html
+    ssize_t preadv (int fd, const iovec *iov, int iovcnt, off_t offset)
+    ssize_t pwritev(int fd, const iovec *iov, int iovcnt, off_t offset)
+
+    enum: RWF_DSYNC
+    enum: RWF_HIPRI
+    enum: RWF_SYNC
+    enum: RWF_NOWAIT
+    enum: RWF_APPEND
+
+    ssize_t preadv2 (int fd, const iovec *iov, int iovcnt, off_t offset, int flags)
+    ssize_t pwritev2(int fd, const iovec *iov, int iovcnt, off_t offset, int flags)