getpt - open a new pseudoterminal master
getpt() opens a new pseudoterminal device and returns a file descriptor
that refers to that device. It is equivalent to opening the pseudoterminal
on Linux systems, though the pseudoterminal multiplexor device is
located elsewhere on some systems that use the GNU C library.
getpt() returns an open file descriptor upon successful completion.
Otherwise, it returns -1 and sets errno to indicate the error.
getpt() can fail with various errors described in open(2).
getpt() is provided in glibc since version 2.1.
For an explanation of the terms used in this section, see attributes(7).
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