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+'\" et
+.TH sys_uio.h "0P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+sys/uio.h
+\(em definitions for vector I/O operations
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/uio.h>
+.fi
+.SH DESCRIPTION
+The
+.IR <sys/uio.h> 
+header shall define the
+.BR iovec
+structure, which shall include at least the following members:
+.sp
+.RS 4
+.nf
+
+void   *iov_base  \fRBase address of a memory region for input or output.\fR
+size_t  iov_len   \fRThe size of the memory pointed to by \fIiov_base.\fR
+.fi
+.P
+.RE
+.P
+The
+.IR <sys/uio.h> 
+header uses the
+.BR iovec
+structure for scatter/gather I/O.
+.P
+The
+.IR <sys/uio.h> 
+header shall define the
+.BR ssize_t
+and
+.BR size_t
+types as described in
+.IR <sys/types.h> .
+.P
+The following shall be declared as functions and may also be defined
+as macros. Function prototypes shall be provided.
+.sp
+.RS 4
+.nf
+
+ssize_t readv(int, const struct iovec *, int);
+ssize_t writev(int, const struct iovec *, int);
+.fi
+.P
+.RE
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+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
+.IR <limits.h> 
+should always be used to learn about the limits instead of assuming a
+fixed value.
+.SH RATIONALE
+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\(hy2001 this value is replaced by the constant
+{IOV_MAX}
+which can be found in
+.IR <limits.h> .
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fB<limits.h>\fP",
+.IR "\fB<sys_types.h>\fP"
+.P
+The System Interfaces volume of POSIX.1\(hy2017,
+.IR "\fIread\fR\^(\|)",
+.IR "\fIreadv\fR\^(\|)",
+.IR "\fIwrite\fR\^(\|)",
+.IR "\fIwritev\fR\^(\|)"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .