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getpt - open the pseudo-terminal master (PTM)
getpt() opens a pseudo-terminal master and returns its file descriptor.
It is equivalent to open("/dev/ptmx",O_RDWR|O_NOCTTY) on Linux systems,
though the pseudo-terminal master is located elsewhere on some systems
that use GNU Libc.
getpt() returns an open file descriptor upon successful completion.
Otherwise, it returns -1 and sets errno to indicate the error.
getpt() is specific to GNU Libc.
grantpt(3), ptsname(3), posix_openpt(3), unlockpt(3), ptmx(4), pty(7)