termios" -- Overview" "

POSIX extended terminal interface
The name termios describes a group of routines that POSIX Standard" defines to extend the termio interface to terminals. termios includes the following routines: 

ccffggeettiissppeeeedd(())    Get input speed
ccffggeettoossppeeeedd(())    Get output speed
ccffsseettiissppeeeedd(())    Set input speed
ccffsseettoossppeeeedd(())    Set output speed
ttccddrraaiinn(())        Drain output to a device
ttccffllooww(())         Control flow on a terminal device
ttccfflluusshh(())        Flush data being exchanged with a terminal
ttccggeettaattttrr(())      Get terminal attributes
ttccsseennddbbrreeaakk(())    Send a break to a terminal
ttccsseettaattttrr(())      Set terminal attributes
Each is described in its own Lexicon entry. Under COHERENT, all are defined as macros in header file <termios.h>.

Example

The following example returns the input and output speeds for the terminal device that you now are using: 
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <termios.h>

int main()
{
     struct termios term;
     int speed;

     if (tcgetattr(STDIN_FILENO, &term) < 0) {
          fprintf(stderr, "tcgetattr error");
          exit(EXIT_FAILURE);
     }

     speed = cfgetispeed(&term);
     printf("tty line input speed is ");

     if      (speed == B50)        printf("50 baud\n");
     else if (speed == B75)        printf("75 baud\n");
     else if (speed == B110)       printf("110 baud\n");
     else if (speed == B134)       printf("134 baud\n");
     else if (speed == B150)       printf("150 baud\n");
     else if (speed == B200)       printf("200 baud\n");
     else if (speed == B300)       printf("300 baud\n");
     else if (speed == B600)       printf("600 baud\n");
     else if (speed == B1200) printf("1200 baud\n");
     else if (speed == B1800) printf("1800 baud\n");
     else if (speed == B2400) printf("2400 baud\n");
     else if (speed == B4800) printf("4800 baud\n");
     else if (speed == B9600) printf("9600 baud\n");
     else if (speed == B19200)     printf("19200 baud\n");
     else if (speed == B38400)     printf("38400 baud\n");
     else                printf("unknown speed\n");

     speed = cfgetospeed(&term);
     printf("tty line output speed is ");

     if      (speed == B50)        printf("50 baud\n");
     else if (speed == B75)        printf("75 baud\n");
     else if (speed == B110)       printf("110 baud\n");
     else if (speed == B134)       printf("134 baud\n");
     else if (speed == B150)       printf("150 baud\n");
     else if (speed == B200)       printf("200 baud\n");
     else if (speed == B300)       printf("300 baud\n");
     else if (speed == B600)       printf("600 baud\n");
     else if (speed == B1200) printf("1200 baud\n");
     else if (speed == B1800) printf("1800 baud\n");
     else if (speed == B2400) printf("2400 baud\n");
     else if (speed == B4800) printf("4800 baud\n");
     else if (speed == B9600) printf("9600 baud\n");
     else if (speed == B19200)     printf("19200 baud\n");
     else if (speed == B38400)     printf("38400 baud\n");
     else                printf("unknown speed\n");

     exit(EXIT_SUCCESS);
}

See Also

Notes

If a program that uses termios has set the termio flag ISIG (which enables signals) and receives character SUSP (normally <ctrl- Z>), it sends the signal SIGTSTP to the current process group. By default, termios then discards SUSP. Character SUSP, as its name implies, tells a program to suspend operation and recede into the background. Please note that because COHERENT does not yet support job control, SUSP at present will do nothing.