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-'\" t
-.\" %%%LICENSE_START(PUBLIC_DOMAIN)
-.\" This page is in the public domain. - aeb
-.\" %%%LICENSE_END
-.\"
-.\" 2004-12-17, mtk, added description of ptsname_r() + ERRORS
-.\"
-.TH ptsname 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-ptsname, ptsname_r \- get the name of the slave pseudoterminal
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.P
-.BI "char *ptsname(int " fd );
-.BI "int ptsname_r(int " fd ", char " buf [. buflen "], size_t " buflen );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR ptsname ():
-.nf
- Since glibc 2.24:
- _XOPEN_SOURCE >= 500
-.\" || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
- glibc 2.23 and earlier:
- _XOPEN_SOURCE
-.fi
-.P
-.BR ptsname_r ():
-.nf
- _GNU_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR ptsname ()
-function returns the name of the slave pseudoterminal device
-corresponding to the master referred to by the file descriptor
-.IR fd .
-.P
-The
-.BR ptsname_r ()
-function is the reentrant equivalent of
-.BR ptsname ().
-It returns the name of the slave pseudoterminal device as a
-null-terminated string in the buffer pointed to by
-.IR buf .
-The
-.I buflen
-argument specifies the number of bytes available in
-.IR buf .
-.SH RETURN VALUE
-On success,
-.BR ptsname ()
-returns a pointer to a string in static storage which will be
-overwritten by subsequent calls.
-This pointer must not be freed.
-On failure, NULL is returned.
-.P
-On success,
-.BR ptsname_r ()
-returns 0.
-On failure, an error number is returned to indicate the error.
-.\" In glibc, the error number is not only returned as the return value
-.\" but also stored in errno. But this is not true for musl libc.
-.SH ERRORS
-.TP
-.B EINVAL
-.RB ( ptsname_r ()
-only)
-.I buf
-is NULL.
-(This error is returned only for
-.\" glibc commit 8f0a947cf55f3b0c4ebdf06953c57eff67a22fa9
-glibc 2.25 and earlier.)
-.TP
-.B ENOTTY
-.I fd
-does not refer to a pseudoterminal master device.
-.TP
-.B ERANGE
-.RB ( ptsname_r ()
-only)
-.I buf
-is too small.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR ptsname ()
-T} Thread safety MT-Unsafe race:ptsname
-T{
-.na
-.nh
-.BR ptsname_r ()
-T} Thread safety MT-Safe
-.TE
-.SH VERSIONS
-A version of
-.BR ptsname_r ()
-is documented on Tru64 and HP-UX,
-but on those implementations,
-\-1 is returned on error, with
-.I errno
-set to indicate the error.
-Avoid using this function in portable programs.
-.SH STANDARDS
-.TP
-.BR ptsname ():
-POSIX.1-2008.
-.P
-.BR ptsname_r ()
-is a Linux extension, that is proposed for inclusion
-.\" FIXME . for later review when Issue 8 is one day released
-.\" http://austingroupbugs.net/tag_view_page.php?tag_id=8
-.\" http://austingroupbugs.net/view.php?id=508
-in the next major revision of POSIX.1 (Issue 8).
-.SH HISTORY
-.TP
-.BR ptsname ():
-POSIX.1-2001.
-glibc 2.1.
-.P
-.BR ptsname ()
-is part of the UNIX 98 pseudoterminal support (see
-.BR pts (4)).
-.SH SEE ALSO
-.BR grantpt (3),
-.BR posix_openpt (3),
-.BR ttyname (3),
-.BR unlockpt (3),
-.BR pts (4),
-.BR pty (7)