Device- and Class- Specific Functions Manager

7. Device- and Class- Specific Functions Manager#

7.1. Introduction#

The device- and class- specific functions manager is …

The directives provided by the device- and class- specific functions manager are:

7.2. Background#

There is currently no text in this section.

7.3. Operations#

There is currently no text in this section.

7.4. Directives#

This section details the device- and class- specific functions manager’s directives. A subsection is dedicated to each of this manager’s directives and describes the calling sequence, related constants, usage, and status codes.

7.4.1. cfgetispeed - Reads terminal input baud rate#

CALLING SEQUENCE:

#include <termios.h>
speed_t cfgetispeed(
    const struct termios *termios_p
);

STATUS CODES:

The cfgetispeed() function returns a code for baud rate.

DESCRIPTION:

The cfsetispeed() function stores a code for the terminal speed stored in a struct termios. The codes are defined in <termios.h> by the macros BO, B50, B75, B110, B134, B150, B200, B300, B600, B1200, B1800, B2400, B4800, B9600, B19200, and B38400.

The cfsetispeed() function does not do anything to the hardware. It merely stores a value for use by tcsetattr().

NOTES:

Baud rates are defined by symbols, such as B110, B1200, B2400. The actual number returned for any given speed may change from system to system.

7.4.2. cfgetospeed - Reads terminal output baud rate#

CALLING SEQUENCE:

#include <termios.h>
speed_t cfgetospeed(
    const struct termios *termios_p
);

STATUS CODES:

The cfgetospeed() function returns the termios code for the baud rate.

DESCRIPTION:

The cfgetospeed() function returns a code for the terminal speed stored in a struct termios. The codes are defined in <termios.h> by the macros BO, B50, B75, B110, B134, B150, B200, B300, B600, B1200, B1800, B2400, B4800, B9600, B19200, and B38400.

The cfgetospeed() function does not do anything to the hardware. It merely returns the value stored by a previous call to tcgetattr().

NOTES:

Baud rates are defined by symbols, such as B110, B1200, B2400. The actual number returned for any given speed may change from system to system.

7.4.3. cfsetispeed - Sets terminal input baud rate#

CALLING SEQUENCE:

#include <termios.h>
int cfsetispeed(
    struct termios *termios_p,
    speed_t speed
);

STATUS CODES:

The cfsetispeed() function returns a zero when successful and returns -1 when an error occurs.

DESCRIPTION:

The cfsetispeed() function stores a code for the terminal speed stored in a struct termios. The codes are defined in <termios.h> by the macros BO, B50, B75, B110, B134, B150, B200, B300, B600, B1200, B1800, B2400, B4800, B9600, B19200, and B38400.

NOTES:

This function merely stores a value in the termios structure. It does not change the terminal speed until a tcsetattr() is done. It does not detect impossible terminal speeds.

7.4.4. cfsetospeed - Sets terminal output baud rate#

CALLING SEQUENCE:

#include <termios.h>
int cfsetospeed(
    struct termios *termios_p,
    speed_t speed
);

STATUS CODES:

The cfsetospeed() function returns a zero when successful and returns -1 when an error occurs.

DESCRIPTION:

The cfsetospeed() function stores a code for the terminal speed stored in a struct termios. The codes are defiined in <termios.h> by the macros BO, B50, B75, B110, B134, B150, B200, B300, B600, B1200, B1800, B2400, B4800, B9600, B19200, and B38400.

The cfsetospeed() function does not do anything to the hardware. It merely stores a value for use by tcsetattr().

NOTES:

This function merely stores a value in the termios structure. It does not change the terminal speed until a tcsetattr() is done. It does not detect impossible terminal speeds.

7.4.5. tcgetattr - Gets terminal attributes#

CALLING SEQUENCE:

#include <termios.h>
int tcgetattr(
    int fildes,
    struct termios *termios_p
);

STATUS CODES:

EBADF

Invalid file descriptor

ENOOTY

Terminal control function attempted for a file that is not a terminal.

DESCRIPTION:

The tcgetattr() gets the parameters associated with the terminal referred to by fildes and stores them into the termios() structure pointed to by termios_p.

NOTES:

NONE

7.4.6. tcsetattr - Set terminal attributes#

CALLING SEQUENCE:

#include <termios.h>
int tcsetattr(
    int fildes,
    int optional_actions,
    const struct termios *termios_p
);

STATUS CODES:

E

The

DESCRIPTION:

NOTES:

7.4.7. tcsendbreak - Sends a break to a terminal#

CALLING SEQUENCE:

#include <termios.h>
int tcsendbreak(
    int fildes,
    int duration
);

STATUS CODES:

E

The

DESCRIPTION:

NOTES:

This routine is not currently supported by RTEMS but could be in a future version.

7.4.8. tcdrain - Waits for all output to be transmitted to the terminal.#

CALLING SEQUENCE:

#include <termios.h>
int tcdrain(
    int fildes
);

STATUS CODES:

EBADF

Invalid file descriptor

EINTR

Function was interrupted by a signal

ENOTTY

Terminal control function attempted for a file that is not a terminal.

DESCRIPTION:

The tcdrain() function waits until all output written to fildes has been transmitted.

NOTES:

NONE

7.4.9. tcflush - Discards terminal data#

CALLING SEQUENCE:

#include <termios.h>
int tcflush(
    int fildes,
    int queue_selector
);

STATUS CODES:

E

The

DESCRIPTION:

NOTES:

This routine is not currently supported by RTEMS but could be in a future version.

7.4.10. tcflow - Suspends/restarts terminal output.#

CALLING SEQUENCE:

#include <termios.h>
int tcflow(
    int fildes,
    int action
);

STATUS CODES:

E

The

DESCRIPTION:

NOTES:

This routine is not currently supported by RTEMS but could be in a future version.

7.4.11. tcgetpgrp - Gets foreground process group ID#

CALLING SEQUENCE:

#include <unistd.h>
pid_t tcgetpgrp(
    int fildes
);

STATUS CODES:

E

The

DESCRIPTION:

NOTES:

This routine is not currently supported by RTEMS but could be in a future version.

7.4.12. tcsetpgrp - Sets foreground process group ID#

CALLING SEQUENCE:

#include <unistd.h>
int tcsetpgrp(
    int fildes,
    pid_t pgid_id
);

STATUS CODES:

E

The

DESCRIPTION:

NOTES:

This routine is not currently supported by RTEMS but could be in a future version.