unlockpt - unlock a pseudoterminal master/slave pair
The unlockpt() function unlocks the slave pseudoterminal device
corresponding to the master pseudoterminal referred to by fd.
unlockpt() should be called before opening the slave side
of a pseudoterminal.
When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets
- The fd argument is not a file descriptor open for writing.
- The fd argument is not associated with a master
unlockpt() 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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