unlockpt(3) - Linux man page
Name
unlockpt - unlock a pseudoterminal master/slave pairSynopsis
#define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> int unlockpt(int fd);
Description
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.
Return Value
When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets errno appropriately.Errors
- EBADF
- The fd argument is not a file descriptor open for writing.
- EINVAL
- The fd argument is not associated with a master pseudoterminal.