Technical data

zs(7D) Devices SunOS 5.5
uucp(1C)) as /dev/cua/n when no one is logged in on the line.
IOCTLS The standard set of termio ioctl() calls are supported by zs.
If the CRTSCTS flag in the c_cflag field is set, output will be generated only if CTS is high;
if CTS is low, output will be frozen. If theCRTSCTS flag is clear, the state of CTS has no
effect.
If the CRTSXOFF flag in the c_cflag field is set, input will be received only if RTS is high; if
RTS is low, input will be frozen. If theCRTSXOFF flag is clear, the state of RTS has no
effect.
The termios CRTSCTS (respectivelyCRTSXOFF) flag and termiox CTSXON (respectively
RTSXOFF) can be used interchangeably.
Breaks can be generated by the TCSBRK, TIOCSBRK, andTIOCCBRK ioctl() calls.
The state of theDCD, CTS, RTS, andDTR interface signals may be queried through the use
of the TIOCM_CAR, TIOCM_CTS, TIOCM_RTS, and TIOCM_DTR arguments to the
TIOCMGET ioctl command, respectively. Due to hardware limitations, only theRTS and
DTR signals may be set through their respective arguments to theTIOCMSET, TIOCMBIS,
and TIOCMBIC ioctl commands.
The input and output line speeds may be set to any of the speeds supported by termio.
The speeds cannot be set independently; when the output speed is set, the input speed is
set to the same speed.
ERRORS An open() will fail if:
ENXIO The unit being opened does not exist.
EBUSY The dial-out device is being opened and the dial-in device is already open, or
the dial-in device is being opened with a no-delay open and the dial-out dev-
ice is already open.
EBUSY The port is in use by another serial protocol.
EBUSY The unit has been marked as exclusive-use by another process with a
TIOCEXCL ioctl() call.
EINTR The open was interrupted by the delivery of a signal.
FILES /dev/cua/[a-z] dial-out tty lines
/dev/term/[a-z] dial-in tty lines
/dev/tty[a-z] binary compatibility package device names
SEE ALSO cu(1C), tip(1), ucblinks(1B), uucp(1C), ports(1M), ioctl(2), open(2), ldterm(7M),
termio(7I), ttcompat(7M), zsh(7D)
Binary Compatibility Guide
DIAGNOSTICS zsn : silo overflow.
The 8530 character input silo overflowed before it could be serviced.
zsn : ring buffer overflow.
7D-414 modified 2 Mar 1995