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UNLOCKPT(3) BSD Library Functions Manual UNLOCKPT(3)
unlockpt -- unlock the slave pseudo-terminal device
Standard C Library (libc, -lc)
The unlockpt() unlocks access to the pseudo-terminal device corresponding to the master
pseudo-terminal device associated with fildes. Conforming applications must call this func-
tion before opening the slave pseudo-terminal device.
If successful, unlockpt() returns 0; otherwise a value of -1 is returned and errno is set to
indicate the error.
The unlockpt() function will fail if:
[EACCESS] the corresponding pseudo-terminal device could not be accessed.
[EBADF] fildes is not a valid descriptor.
[EINVAL] fildes is not associated with a master pseudo-terminal device.
In NetBSD unlockpt() does nothing.
ioctl(2), grantpt(3), posix_openpt(3), ptsname(3)
The unlockpt() function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). Its first release
was in X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'').
BSD May 25, 2004 BSD
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