newlib/winsup/cygwin/termios.cc
Corinna Vinschen 50ad198085 Cygwin: Add 'fallthrough' pseudo keyword for switch/case use
This patch has been inspired by the Linux kernel patch

  294f69e662d1 compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use

written by Joe Perches <joe AT perches DOT com> based on an idea from
Dan Carpenter <dan DOT carpenter AT oracle DOT com>.  The following text
is from the original log message:

Reserve the pseudo keyword 'fallthrough' for the ability to convert the
various case block /* fallthrough */ style comments to appear to be an
actual reserved word with the same gcc case block missing fallthrough
warning capability.

All switch/case blocks now should end in one of:

	break;
	fallthrough;
	goto <label>;
	return [expression];
	continue;

In C mode, GCC supports the __fallthrough__ attribute since 7.1,
the same time the warning and the comment parsing were introduced.

Cygwin-only: add an explicit -Wimplicit-fallthrough=5 to the build
flags.
2020-08-05 21:58:22 +02:00

352 lines
6.7 KiB
C++

/* termios.cc: termios for WIN32.
Written by Doug Evans and Steve Chamberlain of Cygnus Support
dje@cygnus.com, sac@cygnus.com
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "cygwin/version.h"
#include <stdlib.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "perprocess.h"
#include "cygtls.h"
/* tcsendbreak: POSIX 7.2.2.1 */
extern "C" int
tcsendbreak (int fd, int duration)
{
int res = -1;
cygheap_fdget cfd (fd);
if (cfd < 0)
goto out;
if (!cfd->is_tty ())
set_errno (ENOTTY);
else if ((res = cfd->bg_check (-SIGTTOU)) > bg_eof)
res = cfd->tcsendbreak (duration);
out:
syscall_printf ("%R = tcsendbreak(%d, %d)", res, fd, duration);
return res;
}
/* tcdrain: POSIX 7.2.2.1 */
extern "C" int
tcdrain (int fd)
{
pthread_testcancel ();
int res = -1;
termios_printf ("tcdrain");
cygheap_fdget cfd (fd);
if (cfd < 0)
goto out;
if (!cfd->is_tty ())
set_errno (ENOTTY);
else if ((res = cfd->bg_check (-SIGTTOU)) > bg_eof)
res = cfd->tcdrain ();
out:
syscall_printf ("%R = tcdrain(%d)", res, fd);
return res;
}
/* tcflush: POSIX 7.2.2.1 */
extern "C" int
tcflush (int fd, int queue)
{
int res = -1;
cygheap_fdget cfd (fd);
if (cfd < 0)
goto out;
if (!cfd->is_tty ())
set_errno (ENOTTY);
else if (queue != TCIFLUSH && queue != TCOFLUSH && queue != TCIOFLUSH)
set_errno (EINVAL);
else if ((res = cfd->bg_check (-SIGTTOU)) > bg_eof)
res = cfd->tcflush (queue);
out:
termios_printf ("%R = tcflush(%d, %d)", res, fd, queue);
return res;
}
/* tcflow: POSIX 7.2.2.1 */
extern "C" int
tcflow (int fd, int action)
{
int res = -1;
cygheap_fdget cfd (fd);
if (cfd < 0)
goto out;
if (!cfd->is_tty ())
set_errno (ENOTTY);
else if ((res = cfd->bg_check (-SIGTTOU)) > bg_eof)
res = cfd->tcflow (action);
out:
syscall_printf ("%R = tcflow(%d, %d)", res, fd, action);
return res;
}
/* tcsetattr: POSIX96 7.2.1.1 */
extern "C" int
tcsetattr (int fd, int a, const struct termios *t)
{
int res;
t = __tonew_termios (t);
int e = get_errno ();
while (1)
{
res = -1;
cygheap_fdget cfd (fd);
if (cfd < 0)
{
e = get_errno ();
break;
}
if (!cfd->is_tty ())
{
e = ENOTTY;
break;
}
res = cfd->bg_check (-SIGTTOU);
switch (res)
{
case bg_eof:
e = get_errno ();
break;
case bg_ok:
if (cfd.isopen ())
res = cfd->tcsetattr (a, t);
e = get_errno ();
break;
case bg_signalled:
if (_my_tls.call_signal_handler ())
continue;
res = -1;
fallthrough;
default:
e = get_errno ();
break;
}
break;
}
set_errno (e);
termios_printf ("iflag %y, oflag %y, cflag %y, lflag %y, VMIN %d, VTIME %d",
t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, t->c_cc[VMIN],
t->c_cc[VTIME]);
termios_printf ("%R = tcsetattr(%d, %d, %p)", res, fd, a, t);
return res;
}
/* tcgetattr: POSIX 7.2.1.1 */
extern "C" int
tcgetattr (int fd, struct termios *in_t)
{
int res = -1;
struct termios *t = __makenew_termios (in_t);
cygheap_fdget cfd (fd);
if (cfd < 0)
/* saw an error */;
else if (!cfd->is_tty ())
set_errno (ENOTTY);
else if ((res = cfd->tcgetattr (t)) == 0)
__toapp_termios (in_t, t);
if (res)
termios_printf ("%R = tcgetattr(%d, %p)", res, fd, in_t);
else
termios_printf ("iflag %y, oflag %y, cflag %y, lflag %y, VMIN %d, VTIME %d",
t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, t->c_cc[VMIN],
t->c_cc[VTIME]);
return res;
}
/* tcgetpgrp: POSIX 7.2.3.1 */
extern "C" int
tcgetpgrp (int fd)
{
int res;
cygheap_fdget cfd (fd);
if (cfd < 0)
res = -1;
else
res = cfd->tcgetpgrp ();
termios_printf ("%R = tcgetpgrp(%d)", res, fd);
return res;
}
extern "C" pid_t
tcgetsid (int fd)
{
int res;
cygheap_fdget cfd (fd);
if (cfd < 0)
res = -1;
else
res = cfd->tcgetsid ();
termios_printf ("%R = tcgetsid(%d)", res, fd);
return res;
}
/* tcsetpgrp: POSIX 7.2.4.1 */
extern "C" int
tcsetpgrp (int fd, pid_t pgid)
{
int res = -1;
cygheap_fdget cfd (fd);
if (cfd < 0)
/* saw an error */;
else if (!cfd->is_tty ())
set_errno (ENOTTY);
else
res = cfd->tcsetpgrp (pgid);
termios_printf ("%R = tcsetpgrp(%d, %d)", res, fd, pgid);
return res;
}
/* NIST PCTS requires not macro-only implementation */
#undef cfgetospeed
#undef cfgetispeed
#undef cfsetospeed
#undef cfsetispeed
/* cfgetospeed: POSIX96 7.1.3.1 */
extern "C" speed_t
cfgetospeed (const struct termios *tp)
{
return __tonew_termios (tp)->c_ospeed;
}
/* cfgetispeed: POSIX96 7.1.3.1 */
extern "C" speed_t
cfgetispeed (const struct termios *tp)
{
return __tonew_termios (tp)->c_ispeed;
}
static inline int
setspeed (speed_t &set_speed, speed_t from_speed)
{
int res;
switch (from_speed)
{
case B0:
case B50:
case B75:
case B110:
case B134:
case B150:
case B200:
case B300:
case B600:
case B1200:
case B1800:
case B2400:
case B4800:
case B9600:
case B19200:
case B38400:
case B57600:
case B115200:
case B128000:
case B230400:
case B256000:
case B460800:
case B500000:
case B576000:
case B921600:
case B1000000:
case B1152000:
case B1500000:
case B2000000:
case B2500000:
case B3000000:
set_speed = from_speed;
res = 0;
break;
default:
set_errno (EINVAL);
res = -1;
break;
}
return res;
}
/* cfsetospeed: POSIX96 7.1.3.1 */
extern "C" int
cfsetospeed (struct termios *in_tp, speed_t speed)
{
struct termios *tp = __tonew_termios (in_tp);
int res = setspeed (tp->c_ospeed, speed);
__toapp_termios (in_tp, tp);
return res;
}
/* cfsetispeed: POSIX96 7.1.3.1 */
extern "C" int
cfsetispeed (struct termios *in_tp, speed_t speed)
{
struct termios *tp = __tonew_termios (in_tp);
int res = setspeed (tp->c_ispeed, speed);
__toapp_termios (in_tp, tp);
return res;
}
/* cfsetspeed: 4.4BSD */
extern "C" int
cfsetspeed (struct termios *in_tp, speed_t speed)
{
struct termios *tp = __tonew_termios (in_tp);
int res;
/* errors come only from unsupported baud rates, so setspeed() would return
identical results in both calls */
if ((res = setspeed (tp->c_ospeed, speed)) == 0)
setspeed (tp->c_ispeed, speed);
__toapp_termios (in_tp, tp);
return res;
}
extern "C" void
cfmakeraw(struct termios *tp)
{
tp->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
| INLCR | IGNCR | ICRNL | IXON);
tp->c_oflag &= ~OPOST;
tp->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
tp->c_cflag &= ~(CSIZE | PARENB);
tp->c_cflag |= CS8;
}