Advanced Programming in the UNIX® Environment

ptg10805159

Section 18.11Noncanonical Mode 709

#include "apue.h"

static void

sig_catch(int signo)

{

printf("signal caught\n");

tty_reset(STDIN_FILENO);

exit(0);

}

int

main(void)

{

int i;

char c;

if (signal(SIGINT, sig_catch) == SIG_ERR) /* catch signals */

err_sys("signal(SIGINT) error");

if (signal(SIGQUIT, sig_catch) == SIG_ERR)

err_sys("signal(SIGQUIT) error");

if (signal(SIGTERM, sig_catch) == SIG_ERR)

err_sys("signal(SIGTERM) error");

if (tty_raw(STDIN_FILENO) < 0)

err_sys("tty_raw error");

printf("Enter raw mode characters, terminate with DELETE\n");

while ((i = read(STDIN_FILENO, &c, 1)) == 1) {

if ((c &= 255) == 0177) /* 0177 = ASCII DELETE */

break;

printf("%o\n", c);

}

if (tty_reset(STDIN_FILENO) < 0)

err_sys("tty_reset error");

if (i <= 0)

err_sys("read error");

if (tty_cbreak(STDIN_FILENO) < 0)

err_sys("tty_cbreak error");

printf("\nEnter cbreak mode characters, terminate with SIGINT\n");

while ((i = read(STDIN_FILENO, &c, 1)) == 1) {

c &= 255;

printf("%o\n", c);

}

if (tty_reset(STDIN_FILENO) < 0)

err_sys("tty_reset error");

if (i <= 0)

err_sys("read error");

exit(0);

}

Figure 18.21Te st raw and cbreak terminal modes