NAME
unlockpt —
unlock the slave pseudo-terminal
device
LIBRARY
library “libc”
SYNOPSIS
#include
<stdlib.h>
int
unlockpt(int
fildes);
DESCRIPTION
Theunlockpt()
unlocks access to the pseudo-terminal device corresponding to the master
pseudo-terminal device associated with fildes.
Conforming applications must call this function before opening the slave
pseudo-terminal device.
RETURN VALUES
If successful, unlockpt() returns 0;
otherwise a value of -1 is returned and errno is set
to indicate the error.
ERRORS
The unlockpt() function will fail if:
- [
EACCESS] - the corresponding pseudo-terminal device could not be accessed.
- [
EBADF] - fildes is not a valid descriptor.
- [
EINVAL] - fildes is not associated with a master pseudo-terminal device.
NOTES
In NetBSD
unlockpt() does nothing.
SEE ALSO
STANDARDS
The unlockpt() function conforms to
IEEE Std 1003.1-2001 (“POSIX.1”). Its
first release was in X/Open Portability Guide
Issue 4, Version 2 (“XPG4.2”).