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+'\" et
+.TH TTYNAME "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
+ttyname,
+ttyname_r
+\(em find the pathname of a terminal
+.SH SYNOPSIS
+.LP
+.nf
+#include <unistd.h>
+.P
+char *ttyname(int \fIfildes\fP);
+int ttyname_r(int \fIfildes\fP, char *\fIname\fP, size_t \fInamesize\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIttyname\fR()
+function shall return a pointer to a string containing a null-terminated
+pathname of the terminal associated with file descriptor
+.IR fildes .
+The application shall not modify the string returned. The returned
+pointer might be invalidated or the string content might be overwritten
+by a subsequent call to
+\fIttyname\fR().
+The returned pointer and the string content might also be invalidated
+if the calling thread is terminated.
+.P
+The
+\fIttyname\fR()
+function need not be thread-safe.
+.P
+The
+\fIttyname_r\fR()
+function shall store the null-terminated pathname of the terminal
+associated with the file descriptor
+.IR fildes
+in the character array referenced by
+.IR name .
+The array is
+.IR namesize
+characters long and should have space for the name and the terminating
+null character. The maximum length of the terminal name shall be
+{TTY_NAME_MAX}.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIttyname\fR()
+shall return a pointer to a string. Otherwise, a null pointer shall
+be returned and
+.IR errno
+set to indicate the error.
+.P
+If successful, the
+\fIttyname_r\fR()
+function shall return zero. Otherwise, an error number shall be
+returned to indicate the error.
+.SH ERRORS
+The
+\fIttyname\fR()
+function may fail if:
+.TP
+.BR EBADF
+The
+.IR fildes
+argument is not a valid file descriptor.
+.TP
+.BR ENOTTY
+The file associated with the
+.IR fildes
+argument is not a terminal.
+.P
+The
+\fIttyname_r\fR()
+function may fail if:
+.TP
+.BR EBADF
+The
+.IR fildes
+argument is not a valid file descriptor.
+.TP
+.BR ENOTTY
+The file associated with the
+.IR fildes
+argument is not a terminal.
+.TP
+.BR ERANGE
+The value of
+.IR namesize
+is smaller than the length of the string to be returned including the
+terminating null character.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+The term ``terminal'' is used instead of the historical term
+``terminal device'' in order to avoid a reference to an undefined
+term.
+.P
+The thread-safe version places the terminal name in a user-supplied
+buffer and returns a non-zero value if it fails. The non-thread-safe
+version may return the name in a static data area that may be
+overwritten by each call.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+The Base Definitions volume of POSIX.1\(hy2017,
+.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 .