t_raw.c

来自「unix高级编程源代码.<<unix高级编程>>」· C语言 代码 · 共 52 行

#include	<signal.h>
#include	"ourhdr.h"

static void	sig_catch(int);

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_raw error");
	printf("\nEnter cbreak mode characters, terminate with SIGINT\n");
	while ( (i = read(STDIN_FILENO, &c, 1)) == 1) {
		c &= 255;
		printf("%o\n", c);
	}
	tty_reset(STDIN_FILENO);
	if (i <= 0)
		err_sys("read error");
	exit(0);
}

static void
sig_catch(int signo)
{
	printf("signal caught\n");
	tty_reset(STDIN_FILENO);
	exit(0);
}