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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "FWRITE" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" fwrite 
+.SH NAME
+fwrite \- binary output
+.SH SYNOPSIS
+.LP
+\fB#include <stdio.h>
+.br
+.sp
+size_t fwrite(const void *restrict\fP \fIptr\fP\fB, size_t\fP \fIsize\fP\fB,
+size_t\fP \fInitems\fP\fB,
+.br
+\ \ \ \ \ \  FILE *restrict\fP \fIstream\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIfwrite\fP() function shall write, from the array pointed to
+by \fIptr\fP, up to \fInitems\fP elements whose size is
+specified by \fIsize\fP, to the stream pointed to by \fIstream\fP.
+For each object, \fIsize\fP calls shall be made to the \fIfputc\fP()
+function, taking the values (in order) from an array of \fBunsigned
+char\fP
+exactly overlaying the object. The file-position indicator for the
+stream (if defined) shall be advanced by the number of bytes
+successfully written. If an error occurs, the resulting value of the
+file-position indicator for the stream is unspecified.
+.LP
+The
+\fIst_ctime\fP and \fIst_mtime\fP fields of the file shall be marked
+for update between the successful execution of
+\fIfwrite\fP() and the next successful completion of a call to \fIfflush\fP()
+or \fIfclose\fP() on the same stream, or a call to \fIexit\fP()
+or \fIabort\fP(). 
+.SH RETURN VALUE
+.LP
+The \fIfwrite\fP() function shall return the number of elements successfully
+written, which may be less than \fInitems\fP if a
+write error is encountered. If \fIsize\fP or \fInitems\fP is 0, \fIfwrite\fP()
+shall return 0 and the state of the stream
+remains unchanged. Otherwise, if a write error occurs, the error indicator
+for the stream shall be set,   \ and
+\fIerrno\fP shall be set to indicate the error. 
+.SH ERRORS
+.LP
+Refer to \fIfputc\fP() .
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+Because of possible differences in element length and byte ordering,
+files written using \fIfwrite\fP() are
+application-dependent, and possibly cannot be read using \fIfread\fP()
+by a different
+application or by the same application on a different processor.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIferror\fP() , \fIfopen\fP() , \fIprintf\fP()
+, \fIputc\fP() , \fIputs\fP() , \fIwrite\fP() , the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<stdio.h>\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 .