add wrappers for preadv/pwritev

1 files changed, 26 insertions, 0 deletions

diff --git a/include/sys/uio.h b/include/sys/uio.h
index efc681e7b..78341ed40 100644
--- a/include/sys/uio.h
+++ b/include/sys/uio.h
@@ -48,6 +48,32 @@ extern ssize_t readv (int __fd, const struct iovec *__iovec, int __count);
    __THROW.  */
 extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count);
 
+#ifdef __USE_MISC
+/* Read data from file descriptor FD at the given position OFFSET
+   without change the file pointer, and put the result in the buffers
+   described by IOVEC, which is a vector of COUNT 'struct iovec's.
+   The buffers are filled in the order specified.  Operates just like
+   'pread' (see <unistd.h>) except that data are put in IOVEC instead
+   of a contiguous buffer.
+
+   This function is a cancellation point and therefore not marked with
+   __THROW.  */
+extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count,
+		       __off_t __offset) __wur;
+
+/* Write data pointed by the buffers described by IOVEC, which is a
+   vector of COUNT 'struct iovec's, to file descriptor FD at the given
+   position OFFSET without change the file pointer.  The data is
+   written in the order specified.  Operates just like 'pwrite' (see
+   <unistd.h>) except that the data are taken from IOVEC instead of a
+   contiguous buffer.
+
+   This function is a cancellation point and therefore not marked with
+   __THROW.  */
+extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,
+			__off_t __offset) __wur;
+#endif	/* Use misc.  */
+
 __END_DECLS
 
 #endif /* sys/uio.h */