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+'\" et
+.TH FILENO "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
+fileno
+\(em map a stream pointer to a file descriptor
+.SH SYNOPSIS
+.LP
+.nf
+#include <stdio.h>
+.P
+int fileno(FILE *\fIstream\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIfileno\fR()
+function shall return the integer file descriptor associated with
+the stream pointed to by
+.IR stream .
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIfileno\fR()
+shall return the integer value of the file descriptor associated with
+.IR stream .
+Otherwise, the value \-1 shall be returned and
+.IR errno
+set to indicate the error.
+.SH ERRORS
+The
+\fIfileno\fR()
+function shall fail if:
+.TP
+.BR EBADF
+The stream is not associated with a file.
+.P
+The
+\fIfileno\fR()
+function may fail if:
+.TP
+.BR EBADF
+The file descriptor underlying
+.IR stream
+is not a valid file descriptor.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+Without some specification of which file descriptors are associated
+with these streams, it is impossible for an application to set up the
+streams for another application it starts with
+\fIfork\fR()
+and
+.IR exec .
+In particular, it would not be possible to write a portable version of
+the
+.IR sh
+command interpreter (although there may be other constraints that would
+prevent that portability).
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.5.1" ", " "Interaction of File Descriptors and Standard I/O Streams",
+.IR "\fIdirfd\fR\^(\|)",
+.IR "\fIfdopen\fR\^(\|)",
+.IR "\fIfopen\fR\^(\|)",
+.IR "\fIstdin\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 .