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+'\" et
+.TH SETVBUF "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
+setvbuf
+\(em assign buffering to a stream
+.SH SYNOPSIS
+.LP
+.nf
+#include <stdio.h>
+.P
+int setvbuf(FILE *restrict \fIstream\fP, char *restrict \fIbuf\fP, int \fItype\fP,
+    size_t \fIsize\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
+\fIsetvbuf\fR()
+function may be used after the stream pointed to by
+.IR stream
+is associated with an open file but before any other operation
+(other than an unsuccessful call to
+\fIsetvbuf\fR())
+is performed on the stream. The argument
+.IR type
+determines how
+.IR stream
+shall be buffered, as follows:
+.IP " *" 4
+{_IOFBF} shall cause input/output to be fully buffered.
+.IP " *" 4
+{_IOLBF} shall cause input/output to be line buffered.
+.IP " *" 4
+{_IONBF} shall cause input/output to be unbuffered.
+.P
+If
+.IR buf
+is not a null pointer, the array it points to may be used instead of a
+buffer allocated by
+\fIsetvbuf\fR()
+and the argument
+.IR size
+specifies the size of the array; otherwise,
+.IR size
+may determine the size of a buffer allocated by the
+\fIsetvbuf\fR()
+function. The contents of the array at any time are unspecified.
+.P
+For information about streams, see
+.IR "Section 2.5" ", " "Standard I/O Streams".
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIsetvbuf\fR()
+shall return 0. Otherwise, it shall return a non-zero value if an
+invalid value is given for
+.IR type
+or if the request cannot be honored,
+and may set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIsetvbuf\fR()
+function may fail if:
+.TP
+.BR EBADF
+The file descriptor underlying
+.IR stream
+is not valid.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+A common source of error is allocating buffer space as an ``automatic''
+variable in a code block, and then failing to close the stream in the
+same block.
+.P
+With
+\fIsetvbuf\fR(),
+allocating a buffer of
+.IR size
+bytes does not necessarily imply that all of
+.IR size
+bytes are used for the buffer area.
+.P
+Applications should note that many implementations only provide line
+buffering on input from terminal devices.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.5" ", " "Standard I/O Streams",
+.IR "\fIfopen\fR\^(\|)",
+.IR "\fIsetbuf\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 .