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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<sys/uio.h>" 0P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <sys/uio.h> 
+.SH NAME
+sys/uio.h \- definitions for vector I/O operations
+.SH SYNOPSIS
+.LP
+\fB#include <sys/uio.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<sys/uio.h>\fP header shall define the \fBiovec\fP structure
+that includes at least the following members:
+.sp
+.RS
+.nf
+
+\fBvoid   *iov_base \fP Base address of a memory region for input or output. \fB
+size_t  iov_len  \fP The size of the memory pointed to by \fIiov_base.\fP \fB
+\fP
+.fi
+.RE
+.LP
+The \fI<sys/uio.h>\fP header uses the \fBiovec\fP structure for scatter/gather
+I/O.
+.LP
+The \fBssize_t\fP and \fBsize_t\fP types shall be defined as described
+in \fI<sys/types.h>\fP.
+.LP
+The following shall be declared as functions and may also be defined
+as macros. Function prototypes shall be provided.
+.sp
+.RS
+.nf
+
+\fBssize_t readv(int, const struct iovec *, int);
+ssize_t writev(int, const struct iovec *, int);
+\fP
+.fi
+.RE
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+The implementation can put a limit on the number of scatter/gather
+elements which can be processed in one call. The symbol
+{IOV_MAX} defined in \fI<limits.h>\fP should always be used to learn
+about the
+limits instead of assuming a fixed value.
+.SH RATIONALE
+.LP
+Traditionally, the maximum number of scatter/gather elements the system
+can process in one call were described by the symbolic
+value {UIO_MAXIOV}. In IEEE\ Std\ 1003.1-2001 this value is replaced
+by the constant {IOV_MAX} which can be found in \fI<limits.h>\fP.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<limits.h>\fP, \fI<sys/types.h>\fP, the System Interfaces volume
+of IEEE\ Std\ 1003.1-2001, \fIread\fP(), \fIwrite\fP()
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .