ptsname, ptsname_r - get the name of the slave pseudoterminal
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
The ptsname() function returns the name of the slave pseudoterminal device corresponding to the master referred to by the file descriptor
The ptsname_r() function is the reentrant equivalent of ptsname(). It returns the name of the slave pseudoterminal device as a null-terminated string in the buffer pointed to by
buflen argument specifies the number of bytes available in
ptsname(): POSIX.1-2001, POSIX.1-2008.
ptsname_r() is a Linux extension, that is proposed for inclusion in the next major revision of POSIX.1 (Issue 8). A version of this function is documented on Tru64 and HP-UX, but on those implementations, -1 is returned on error, with
errno set to indicate the error. Avoid using this function in portable programs.
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