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unlockpt(S)


unlockpt -- unlock a pseudo-terminal master/slave pair

Synopsis

   #include <stdlib.h>
   #include <sys/ptms.h>
   

int unlockpt(int fildes);

Description

The function unlockpt clears a lock flag associated with the slave pseudo-terminal device associated with its master pseudo-terminal counterpart so that the slave pseudo-terminal device can be opened. fildes is a file descriptor returned from a successful open of a master pseudo-terminal device.

Return values

Upon successful completion, the function unlockpt returns 0; otherwise it returns -1.

Errors

A failure may occur if fildes is not an open file descriptor or is not associated with a master pseudo-terminal device.

References

grantpt(S), open(S), ptsname(S), pty(HW)
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SCO OpenServer Release 6.0.0 - 01 June 2005