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Utilities & Libraries
Devctl and Ioctl Commands
TC*
TCSETA, TCSETAF, TCSETAW
Set terminal properties from a termio structure

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      - TCFLSH
        Flush buffers
      - TCGETA
        Get the terminal properties in a termio structure
      - TCGETS
        Get the terminal properties in a termios structure
      - TCSBRK
        Assert a break condition over a communications line
      - TCSETA, TCSETAF, TCSETAW
        Set terminal properties from a termio structure
      - TCSETS, TCSETSF, TCSETSW
        Set terminal properties from a termios structure
      - TCXONC
        Perform a flow-control operation on a data stream
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TCSETA, TCSETAF, TCSETAW

QNX SDP8.0Devctl and Ioctl CommandsDeveloper

Set terminal properties from a termio structure

Synopsis:

#include <sys/ioctl.h>

#define TCSETA          _IOW('T', 2, struct termio)
#define TCSETAW         _IOW('T', 3, struct termio)
#define TCSETAF         _IOW('T', 4, struct termio)

Arguments to ioctl():


Argument	Value
`fd`	A file descriptor that you obtained by opening the device
`request`	TCSETA, TCSETAF, or TCSETAW
Additional argument	A pointer to a struct termio

Description:

These commands change the current terminal control settings of a device:

TCSETA — make the change immediately
TCSETAF — Don't make the change until all currently written data has been transmitted, at which point any received but unread data is also discarded.
TCSETAW — don't make the change until all currently written data has been transmitted.

Note:

These commands are for internal use, and you shouldn't use them directly. Instead use the tcsetattr() cover function.

The TCSETS, TCSETSF, and TCSETSW ioctl() commands are similar, but they use a struct termios instead of a struct termio.

Input:

A termio structure.

Output:

None.

See also:

TCGETA, TCSETS, TCSETSF, TCSETSW, TIOCSETA, TIOCSETAF, TIOCSETAW

ioctl(), in the QNX OS C Library Reference

Page updated: March 05, 2025