unlockpt()
QNX SDP8.0C Library ReferenceAPIDeveloper
Unlock a pseudo-terminal master/slave pair
Synopsis:
#include <stdlib.h>
int unlockpt( int filedes );
Arguments:
- filedes
- The file descriptor for the master pseudo-terminal.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The unlockpt() function unlocks the slave pseudo-terminal device associated with the master to which filedes refers. Call unlockpt() before you open the slave side of a pseudo-terminal device.
Returns:
0, or -1 if an error occurred (errno is set).
Errors:
- EBADF
- The filedes argument isn't a file descriptor open for writing.
- EINTR
- The call was interrupted by a signal.
- EINVAL
- The filedes argument isn't associated with a master pseudo-terminal device.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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