unlockpt(3c) [hpux man page]

unlockpt(3C)															      unlockpt(3C)

NAME

       unlockpt - unlock a STREAMS pty master and slave pair

SYNOPSIS

DESCRIPTION

       The  passed  parameter,	fildes, is a file descriptor that is returned from a successful open of a master pty (pseudo-terminal) device. The
       function unlocks a slave pty from its associated master counterpart.  It does this by clearing a lock flag so that the  slave  pty  can	be
       opened. For security reason, grantpt(3C) must be executed before unlockpt(3C).

RETURN VALUE

       Upon successful completion, the function returns a value of 0 (zero).  Otherwise, it returns a value of -1.

       Failure may result under the following conditions:

	      o  The file descriptor specified by the fildes parameter is not an open file descriptor.

	      o  The file descriptor specified by the fildes parameter is not associated with a STREAMS pty master device.

EXAMPLES

       The following example shows how is typically used.

		   ...

AUTHOR

       was developed by HP and OSF.

SEE ALSO

       open(2), grantpt(3C), ptsname(3C), ptm(7), pts(7), ptem(7).

																      unlockpt(3C)

grantpt(3C)															       grantpt(3C)

NAME

       grantpt - grant access to the STREAMS slave pty

SYNOPSIS

DESCRIPTION

       The  passed  parameter,	fildes,  is  a	file  descriptor that is returned from a successful open of a STREAMS master pty (pseudo-terminal)
       device. The function modifies the ownership and mode of the slave pty device special file associated with its master pty counterpart.

       A root program is spawned to change ownership and mode of the pty slave device file in the following way: The group ID is set to a reserved
       group named "tty".  The slave user ID is set to the effective owner of the calling process.  The permissions of the slave device are set so
       that the owner is allowed read and write access and the group is allowed write access.

RETURN VALUE

       Upon successful completion, the function returns a value of 0 (zero).  Otherwise, it returns a value of -1.

       Failure may result under the following conditions:

	      o  The file descriptor specified by the fildes parameter is not an open file descriptor.

	      o  The file descriptor specified by the fildes parameter is not associated with a STREAMS master pty device.

	      o  The corresponding slave pty device cannot be accessed.

WARNINGS

       The function may also fail if the application has installed a signal handler to catch the SIGCHLD (death of a child) signal.

EXAMPLES

       The following example shows how is typically used.

		 ...

AUTHOR

       was developed by HP and OSF.

SEE ALSO

       open(2), unlockpt(3C), ptsname(3C), ptm(7), pts(7), ptem(7), ldterm(7).

																       grantpt(3C)