@node ptsname
@section @code{ptsname}
@findex ptsname

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/ptsname.html}

Gnulib module: ptsname

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
OpenBSD 3.8, Minix 3.1.8, mingw, MSVC 14.
@item
This function fails to set errno on failure on some platforms:
FreeBSD 8.2.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
On Solaris 11 2010-11, this function fails on all BSD-style @file{/dev/pty*}
device files.
@item
This function is not thread-safe on some platforms:
Cygwin 1.7.9.
Likewise, the gnulib replacement is not thread-safe.
@end itemize

Note that the Gnulib module @code{ptsname_r} is a version of this
function that is more likely to be thread-safe.