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+'\" et
+.TH FWRITE "3P" 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
+fwrite
+\(em binary output
+.SH SYNOPSIS
+.LP
+.nf
+#include <stdio.h>
+.P
+size_t fwrite(const void *restrict \fIptr\fP, size_t \fIsize\fP, size_t \fInitems\fP,
+    FILE *restrict \fIstream\fP);
+.fi
+.SH DESCRIPTION
+The functionality described on this reference page is aligned with the
+ISO\ C standard. Any conflict between the requirements described here and the
+ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
+.P
+The
+\fIfwrite\fR()
+function shall write, from the array pointed to by
+.IR ptr ,
+up to
+.IR nitems
+elements whose size is specified by
+.IR size ,
+to the stream pointed to by
+.IR stream .
+For each object,
+.IR size
+calls shall be made to the
+\fIfputc\fR()
+function, taking the values (in order) from an array of
+.BR "unsigned char"
+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.
+.P
+The last data modification and last file status change timestamps
+of the file shall be marked for update between the successful
+execution of
+\fIfwrite\fR()
+and the next successful completion of a call to
+\fIfflush\fR()
+or
+\fIfclose\fR()
+on the same stream, or a call to
+\fIexit\fR()
+or
+\fIabort\fR().
+.SH "RETURN VALUE"
+The
+\fIfwrite\fR()
+function shall return the number of elements successfully written,
+which may be less than
+.IR nitems
+if a write error is encountered. If
+.IR size
+or
+.IR nitems
+is 0,
+\fIfwrite\fR()
+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
+.IR errno
+shall be set to indicate the error.
+.SH ERRORS
+Refer to
+.IR "\fIfputc\fR\^(\|)".
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+Because of possible differences in element length and byte ordering,
+files written using
+\fIfwrite\fR()
+are application-dependent, and possibly cannot be read using
+\fIfread\fR()
+by a different application or by the same application on a different
+processor.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.5" ", " "Standard I/O Streams",
+.IR "\fIferror\fR\^(\|)",
+.IR "\fIfopen\fR\^(\|)",
+.IR "\fIfprintf\fR\^(\|)",
+.IR "\fIputc\fR\^(\|)",
+.IR "\fIputs\fR\^(\|)",
+.IR "\fIwrite\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<stdio.h>\fP"
+.\"
+.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 .