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getty: fix handling of speed 0;

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stop using non-portable way of setting speeds.

function                                             old     new   delta
cfsetispeed                                            -      76     +76
cfsetospeed                                            -      57     +57
cfgetispeed                                            -      20     +20
This commit is contained in:
Denis Vlasenko 2009-04-12 13:05:40 +00:00
parent 5c32993009
commit 32a385f5b0
1 changed files with 14 additions and 10 deletions
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24
loginutils/getty.c
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@ -165,12 +165,7 @@ static void parse_speeds(struct options *op, char *arg)
op->speeds[op->numspeed] = bcode(cp);
if (op->speeds[op->numspeed] < 0)
bb_error_msg_and_die("bad speed: %s", cp);
else if (op->speeds[op->numspeed] == 0) {
struct termios tio;
if (tcgetattr(1, &tio) != 0)
bb_error_msg_and_die("auto baudrate detection failed");
op->speeds[op->numspeed] = cfgetospeed(&tio);
}
/* note: arg "0" turns into speed B0 */
op->numspeed++;
if (op->numspeed > MAX_SPEED)
bb_error_msg_and_die("too many alternate speeds");
@ -276,6 +271,7 @@ static void open_tty(const char *tty)
/* termios_init - initialize termios settings */
static void termios_init(struct termios *tp, int speed, struct options *op)
{
speed_t ispeed, ospeed;
/*
* Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
* Special characters are set after we have read the login name; all
@ -286,10 +282,18 @@ static void termios_init(struct termios *tp, int speed, struct options *op)
/* flush input and output queues, important for modems! */
ioctl(0, TCFLSH, TCIOFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
#endif
tp->c_cflag = CS8 | HUPCL | CREAD | speed;
ispeed = ospeed = speed;
if (speed == B0) {
/* Speed was specified as "0" on command line.
* Just leave it unchanged */
ispeed = cfgetispeed(tp);
ospeed = cfgetospeed(tp);
}
tp->c_cflag = CS8 | HUPCL | CREAD;
if (op->flags & F_LOCAL)
tp->c_cflag |= CLOCAL;
cfsetispeed(tp, ispeed);
cfsetospeed(tp, ospeed);
tp->c_iflag = tp->c_lflag = tp->c_line = 0;
tp->c_oflag = OPOST | ONLCR;
@ -759,8 +763,8 @@ int getty_main(int argc UNUSED_PARAM, char **argv)
break;
/* we are here only if options.numspeed > 1 */
baud_index = (baud_index + 1) % options.numspeed;
termios.c_cflag &= ~CBAUD;
termios.c_cflag |= options.speeds[baud_index];
cfsetispeed(&termios, options.speeds[baud_index]);
cfsetospeed(&termios, options.speeds[baud_index]);
tcsetattr_stdin_TCSANOW(&termios);
}
}