HP-UX Reference (11i v1 05/09) - 7 Device (Special) Files, 9 General Information, Index (vol 10)

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modem(7) modem(7)

int ioctl(int fildes, int command, int *arg);

The commands using this form are:

TIOCMGET Get the current state of both inbound and outbound modem lines and store in the int refer-

enced by arg. A raised line will be indicated by a one bit in the appropriate position.

TIOCMSET Set the outbound modem lines from the int referenced by

arg.

TIOCMBIS Raise the control lines speciﬁed by a one in the corresponding bit positions of the int refer-

enced by arg.

TIOCMBIC Lower the control lines speciﬁed by a one in the corresponding bit positions of the int refer-

enced by arg.

Note that setting bits for inbound lines has no effect, and setting any bits while in CCITT mode has no

effect. Also, the change to the modem lines is immediate and using these ioctl’s while characters are still

being output may cause unpredictable results.

WARNING

Occasionally it is possible that a process may open a call-out ﬁle at approximately the same time as an

incoming call is received. In some cases, the call-out connection may be satisﬁed by the incoming call. In

general, however, the results are indeterminate. If necessary, the situation can be avoided by the use of

two modems and ports, one for call-out connections and the other for receiving incoming calls.

DEPENDENCIES

Some hardware implementations may not have access to all modem lines supported by

MCSETA. If a partic-

ular hardware does not support a given line, attempts to set the value of a line will be ignored, and reading

the current state of the line will return zero. The appropriate I/O card manual should be referenced to

determine the lines supported by the hardware installed.

Some hardware implementations may not have access to all timers supported by

MCSETT. Also, the granu-

larity of the individual timers may vary depending on the hardware and system in use. The effect of set-

ting a timer out of range or with a granularity outside the capability of a particular system should be docu-

mented by that system. The effect of changing the value for a timer while that timer is running is system

dependent and should be documented by each system.

Setting the

CLOCAL bit while a timer is running will cause the timer to be stopped. It is a system depen-

dency whether or not the timer is restarted, and if so, the value at which it is restarted when the

CLOCAL

bit is subsequently cleared.

On those implementations supporting the HP27140A 6-Channel Multiplexer, transmission of characters

cannot be stopped during loss of DCD. The driver cannot detect loss of DCD until the connection is broken.

Also, the I/O card may still have characters in its internal buffers and will still try to transmit them.

AUTHOR

modem was developed by HP and AT&T.

FILES

/dev/cua ∗

/dev/cul ∗

/dev/tty ∗

/dev/ttyd ∗

EISA mux has adopted the following device ﬁles naming convention:

/dev/<cua|cul|tty|ttyd><Instance_Number

><Port_Module_Name><Port_Number>

where Port_Module_Name = [a..h], Port_Number =1-16

For example:

/dev/cua2a1 , /dev/cul2b8 , /dev/tty2g12 , /dev/ttyd2h16