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+'\" et
+.TH PTSNAME "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
+ptsname
+\(em get name of the slave pseudo-terminal device
+.SH SYNOPSIS
+.LP
+.nf
+#include <stdlib.h>
+.P
+char *ptsname(int \fIfildes\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIptsname\fR()
+function shall return the name of the slave pseudo-terminal device
+associated with a master pseudo-terminal device. The
+.IR fildes
+argument is a file descriptor that refers to the master device. The
+\fIptsname\fR()
+function shall return a pointer to a string containing the pathname
+of the corresponding slave device.
+.P
+The
+\fIptsname\fR()
+function need not be thread-safe.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIptsname\fR()
+shall return a pointer to a string which is the name of the
+pseudo-terminal slave device. Upon failure,
+\fIptsname\fR()
+shall return a null pointer and may set
+.IR errno .
+This could occur if
+.IR fildes
+is an invalid file descriptor or if the slave device name does not
+exist in the file system.
+.P
+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
+\fIptsname\fR().
+The returned pointer and the string content might also be invalidated
+if the calling thread is terminated.
+.SH ERRORS
+The
+\fIptsname\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 master pseudo-terminal device.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+See the RATIONALE section for
+.IR "\fIposix_openpt\fR\^(\|)".
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIgrantpt\fR\^(\|)",
+.IR "\fIopen\fR\^(\|)",
+.IR "\fIposix_openpt\fR\^(\|)",
+.IR "\fIttyname\fR\^(\|)",
+.IR "\fIunlockpt\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<stdlib.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 .