09-09-2010
Thanks Guys
I went Coronas way as I also wanted to incorporate the queryvariable changing and I could visualise the code better in my head.
What now happens is the queyvalue gets read from a blacklist table and then tested against the 'master' tables, if there's a match it sets a bypass flag and moves onto the next 'master' table.
The whole script is working now, I just have to do some better formatting of the output to make it easier to read.
Thanks once again.
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LEARN ABOUT OPENSOLARIS
ptm
ptm(7D) Devices ptm(7D)
NAME
ptm - STREAMS pseudo-tty master driver
DESCRIPTION
The pseudo-tty subsystem simulates a terminal connection, where the master side represents the terminal and the slave represents the user
process's special device end point. In order to use the pseudo-tty subsystem, a node for the master side driver /dev/ptmx and N number of
nodes for the slave driver must be installed. See pts(7D). The master device is set up as a cloned device where its major device number is
the major for the clone device and its minor device number is the major for the ptm driver. There are no nodes in the file system for mas-
ter devices. The master pseudo driver is opened using the open(2) system call with /dev/ptmx as the device parameter. The clone open finds
the next available minor device for the ptm major device.
A master device is available only if it and its corresponding slave device are not already open. When the master device is opened, the cor-
responding slave device is automatically locked out. Only one open is allowed on a master device. Multiple opens are allowed on the slave
device. After both the master and slave have been opened, the user has two file descriptors which are the end points of a full duplex con-
nection composed of two streams which are automatically connected at the master and slave drivers. The user may then push modules onto
either side of the stream pair.
The master and slave drivers pass all messages to their adjacent queues. Only the M_FLUSH needs some processing. Because the read queue of
one side is connected to the write queue of the other, the FLUSHR flag is changed to the FLUSHW flag and vice versa. When the master device
is closed an M_HANGUP message is sent to the slave device which will render the device unusable. The process on the slave side gets the
errno EIO when attempting to write on that stream but it will be able to read any data remaining on the stream head read queue. When all
the data has been read, read() returns 0 indicating that the stream can no longer be used. On the last close of the slave device, a
0-length message is sent to the master device. When the application on the master side issues a read() or getmsg() and 0 is returned, the
user of the master device decides whether to issue a close() that dismantles the pseudo-terminal subsystem. If the master device is not
closed, the pseudo-tty subsystem will be available to another user to open the slave device.
If O_NONBLOCK or O_NDELAY is set, read on the master side returns -1 with errno set to EAGAIN if no data is available, and write returns -1
with errno set to EAGAIN if there is internal flow control.
IOCTLS
The master driver supports the ISPTM and UNLKPT ioctls that are used by the functions grantpt(3C), unlockpt(3C) and ptsname(3C). The ioctl
ISPTM determines whether the file descriptor is that of an open master device. On success, it returns the 0. The ioctl UNLKPT unlocks the
master and slave devices. It returns 0 on success. On failure, the errno is set to EINVAL indicating that the master device is not open.
FILES
/dev/ptmx master clone device
/dev/pts/M slave devices (M = 0 -> N-1)
SEE ALSO
grantpt(3C), ptsname(3C), unlockpt(3C), pckt(7M), pts(7D)
STREAMS Programming Guide
SunOS 5.11 5 Feb 1997 ptm(7D)