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+'\" et
+.TH STDIN "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
+stderr,
+stdin,
+stdout
+\(em standard I/O streams
+.SH SYNOPSIS
+.LP
+.nf
+#include <stdio.h>
+.P
+extern FILE *stderr, *stdin, *stdout;
+.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
+A file with associated buffering is called a
+.IR stream
+and is declared to be a pointer to a defined type
+.BR FILE .
+The
+\fIfopen\fR()
+function shall create certain descriptive data for a stream and return
+a pointer to designate the stream in all further transactions. Normally,
+there are three open streams with constant pointers declared in the
+.IR <stdio.h> 
+header and associated with the standard open files.
+.P
+At program start-up, three streams shall be predefined and need not
+be opened explicitly:
+.IR "standard input"
+(for reading conventional input),
+.IR "standard output"
+(for writing conventional output), and
+.IR "standard error"
+(for writing diagnostic output). When opened, the standard error
+stream is not fully buffered; the standard input and standard output
+streams are fully buffered if and only if the stream can be determined
+not to refer to an interactive device.
+.P
+The following symbolic values in
+.IR <unistd.h> 
+define the file descriptors that shall be associated with the C-language
+.IR stdin ,
+.IR stdout ,
+and
+.IR stderr
+when the application is started:
+.IP STDIN_FILENO 14
+Standard input value,
+.IR stdin .
+Its value is 0.
+.IP STDOUT_FILENO 14
+Standard output value,
+.IR stdout .
+Its value is 1.
+.IP STDERR_FILENO 14
+Standard error value,
+.IR stderr .
+Its value is 2.
+.P
+The
+.IR stderr
+stream is expected to be open for reading and writing.
+.SH "RETURN VALUE"
+None.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIfclose\fR\^(\|)",
+.IR "\fIfeof\fR\^(\|)",
+.IR "\fIferror\fR\^(\|)",
+.IR "\fIfileno\fR\^(\|)",
+.IR "\fIfopen\fR\^(\|)",
+.IR "\fIfprintf\fR\^(\|)",
+.IR "\fIfread\fR\^(\|)",
+.IR "\fIfscanf\fR\^(\|)",
+.IR "\fIfseek\fR\^(\|)",
+.IR "\fIgetc\fR\^(\|)",
+.IR "\fIgets\fR\^(\|)",
+.IR "\fIpopen\fR\^(\|)",
+.IR "\fIputc\fR\^(\|)",
+.IR "\fIputs\fR\^(\|)",
+.IR "\fIread\fR\^(\|)",
+.IR "\fIsetbuf\fR\^(\|)",
+.IR "\fIsetvbuf\fR\^(\|)",
+.IR "\fItmpfile\fR\^(\|)",
+.IR "\fIungetc\fR\^(\|)",
+.IR "\fIvfprintf\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<stdio.h>\fP",
+.IR "\fB<unistd.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 .