NAME

unlockpt - unlock a pseudo-terminal master/slave pair

SYNOPSIS

#include <stdlib.h>

int unlockpt(int fildes);

DESCRIPTION

The unlockpt() function unlocks the slave pseudo-terminal device associated with the master to which fildes refers.

Portable applications must call unlockpt() before opening the slave side of a pseudo-terminal device.

RETURN VALUE

Upon successful completion, unlockpt() returns 0. Otherwise, it returns -1 and sets errno to indicate the error.

ERRORS

The unlockpt() function may fail if:

[EBADF]

The fildes argument is not a file descriptor open for writing.

[EINVAL]

The fildes argument is not associated with a master pseudo-terminal device.

EXAMPLES

None.

APPLICATION USAGE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

grantpt(), open(), ptsname(), <stdlib.h>.