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ptsname
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/ptsname.html
Gnulib module: ptsname
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
Note that the Gnulib module ptsname_r
is a version of this
function that is more likely to be thread-safe.