t_raw.c

UNIX编程高级环境（第二版）的终端IO部分的程序源码

#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);
}