Provided by: manpages-dev_3.35-0.1ubuntu1_all
unlockpt - unlock a pseudoterminal master/slave pair
#define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> int unlockpt(int fd);
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 errno appropriately.
EBADF The fd argument is not a file descriptor open for writing. EINVAL The fd argument is not associated with a master pseudoterminal.
unlockpt() is provided in glibc since version 2.1.
grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)
This page is part of release 3.35 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man- pages/. 2008-06-14 UNLOCKPT(3)