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unlockpt(3) Library Functions Manual unlockpt(3) NAME unlockpt - Unlocks a pseudoterminal master and slave pair LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <stdlib.h> int unlockpt( int mastfd); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: unlockpt(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies a file descriptor that is returned from a successful open of the master pseudoterminal device. DESCRIPTION The unlockpt() function unlocks a slave pseudoterminal from its associ- ated master counterpart. It does this by clearing a lock flag so that the slave device can be opened. RETURN VALUE Upon successful completion, the unlockpt() function returns a value of 0. Otherwise, it returns a value of -1 and sets errno to indicate the error. ERRORS The unlockpt() function sets errno to the specified values for the fol- lowing conditions: The file descriptor specified by the mastfd parameter is not an open file descriptor. The file descriptor specified by the mastfd parameter is not associated with a master pseudoterminal device. RELATED INFORMATION Functions: openpty(3) Standards: standards(5) Guides: System V Compatibility User's Guide delim off unlockpt(3)