#define _XOPEN_SOURCE /* See feature_test_macros(7) */
int unlockpt(int fd);
DESCRIPTIONThe 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 VALUEWhen successful, unlockpt() returns 0. Otherwise, it returns -1 and sets errno appropriately.
- The fd argument is not a file descriptor open for writing.
- The fd argument is not associated with a master pseudoterminal.
VERSIONSunlockpt() is provided in glibc since version 2.1.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
COLOPHONThis page is part of release 4.06 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.