|TIOCSETD int *ldisc|
This call is obsolete but left for compatibility.
.Fx 8.0 , it would change to the new line discipline pointed to by ldisc.
|TIOCGETD int *ldisc|
|Return the current line discipline in the integer pointed to by ldisc.|
|Set the terminal hardware into BREAK condition.|
|Clear the terminal hardware BREAK condition.|
|Assert data terminal ready (DTR).|
|Clear data terminal ready (DTR).|
|TIOCGPGRP int *tpgrp|
|Return the current process group with which the terminal is associated in the integer pointed to by tpgrp. This is the underlying call that implements the termios(4) tcgetattr call.|
|TIOCSPGRP int *tpgrp|
|Associate the terminal with the process group (as an integer) pointed to by tpgrp. This is the underlying call that implements the termios(4) tcsetattr call.|
|TIOCGETA struct termios *term|
|Place the current value of the termios state associated with the device in the termios structure pointed to by term. This is the underlying call that implements the termios(4) tcgetattr call.|
|TIOCSETA struct termios *term|
|Set the termios state associated with the device immediately. This is the underlying call that implements the termios(4) tcsetattr call with the TCSANOW option.|
|TIOCSETAW struct termios *term|
|First wait for any output to complete, then set the termios state associated with the device. This is the underlying call that implements the termios(4) tcsetattr call with the TCSADRAIN option.|
|TIOCSETAF struct termios *term|
|First wait for any output to complete, clear any pending input, then set the termios state associated with the device. This is the underlying call that implements the termios(4) tcsetattr call with the TCSAFLUSH option.|
|TIOCOUTQ int *num|
|Place the current number of characters in the output queue in the integer pointed to by num.|
|TIOCSTI char *cp|
|Simulate typed input. Pretend as if the terminal received the character pointed to by cp.|
This call is obsolete but left for compatibility.
In the past, when a process that did not have a controlling terminal (see
The Controlling Terminal
first opened a terminal device, it acquired that terminal as its
For some programs this was a hazard as they
did not want a controlling terminal in the first place, and this
provided a mechanism to disassociate the controlling terminal from
the calling process.
be called by opening the file
on that file descriptor.
The current system does not allocate a controlling terminal to a process on an open call: there is a specific ioctl called TIOCSCTTY to make a terminal the controlling terminal. In addition, a program can fork and call the setsid system call which will place the process into its own session - which has the effect of disassociating it from the controlling terminal. This is the new and preferred method for programs to lose their controlling terminal.
|Stop output on the terminal (like typing ^S at the keyboard).|
|Start output on the terminal (like typing ^Q at the keyboard).|
|Make the terminal the controlling terminal for the process (the process must not currently have a controlling terminal).|
|Wait until all output is drained.|
|Set exclusive use on the terminal. No further opens are permitted except by root. Of course, this means that programs that are run by root (or setuid) will not obey the exclusive setting - which limits the usefulness of this feature.|
|Clear exclusive use of the terminal. Further opens are permitted.|
|TIOCFLUSH int *what|
If the value of the int pointed to by
bit as defined in
.In sys/file.h , then all characters in the input queue are cleared. If it contains the FWRITE bit, then all characters in the output queue are cleared. If the value of the integer is zero, then it behaves as if both the FREAD and FWRITE bits were set (i.e., clears both queues).
|TIOCGWINSZ struct winsize *ws|
Put the window size information associated with the terminal in the
structure pointed to by
The window size structure contains the number of rows and columns (and pixels
if appropriate) of the devices attached to the terminal.
It is set by user software
and is the means by which most full-screen oriented programs determine the
structure is defined in
.In sys/ioctl.h .
|TIOCSWINSZ struct winsize *ws|
|Set the window size associated with the terminal to be the value in the winsize structure pointed to by ws (see above).|
|TIOCCONS int *on|
|If on points to a non-zero integer, redirect kernel console output (kernel printfs) to this terminal. If on points to a zero integer, redirect kernel console output back to the normal console. This is usually used on workstations to redirect kernel messages to a particular window.|
|TIOCMSET int *state|
The integer pointed to by
contains bits that correspond to modem state.
Following is a list of defined variables and the modem state they represent:
|Data Terminal Ready.|
|Request To Send.|
|Clear To Send.|
|TIOCM_CD||Carrier Detect (synonym).|
|TIOCM_RI||Ring Indication (synonym).|
|Data Set Ready.|
This call sets the terminal modem state to that represented by state. Not all terminals may support this.
|TIOCMGET int *state|
|Return the current state of the terminal modem lines as represented above in the integer pointed to by state.|
|TIOCMBIS int *state|
|The bits in the integer pointed to by state represent modem state as described above, however the state is OR-ed in with the current state.|
|TIOCMBIC int *state|
|The bits in the integer pointed to by state represent modem state as described above, however each bit which is on in state is cleared in the terminal.|
The total number of input and output bytes through all terminal devices are available via the kern.tk_nin and kern.tk_nout read-only sysctl(8) variables.