1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
3 /* serial port functions
5 * Author: Chris Toshok <toshok@ximian.com>
16 #if defined(HAVE_POLL_H)
18 #elif defined(HAVE_SYS_POLL_H)
21 #include <sys/ioctl.h>
23 /* This is for ASYNC_*, serial_struct on linux */
24 #if defined(HAVE_LINUX_SERIAL_H)
25 #include <linux/serial.h>
30 /* This is for FIONREAD on solaris */
32 #include <sys/filio.h>
35 /* sys/time.h (for timeval) is required when using osx 10.3 (but not 10.4) */
36 /* IOKit is a private framework in iOS, so exclude there */
37 #if defined(__APPLE__) && !defined(HOST_IOS)
39 #include <IOKit/IOKitLib.h>
40 #include <IOKit/serial/IOSerialKeys.h>
41 #include <IOKit/serial/ioss.h>
42 #include <IOKit/IOBSD.h>
45 /* This is a copy of System.IO.Ports.Handshake */
50 RequestToSendXOnXOff = 3
53 /* This is a copy of System.IO.Ports.Parity */
62 /* This is a copy of System.IO.Ports.StopBits */
70 /* This is a copy of System.IO.Ports.SerialSignal */
73 Cd = 1, /* Carrier detect */
74 Cts = 2, /* Clear to send */
75 Dsr = 4, /* Data set ready */
76 Dtr = 8, /* Data terminal ready */
77 Rts = 16 /* Request to send */
81 * Silence the compiler, we do not need these prototypes to be public, since these are only
85 int open_serial (char *devfile);
86 int close_serial (int unix_fd);
87 guint32 read_serial (int fd, guchar *buffer, int offset, int count);
88 int write_serial (int fd, guchar *buffer, int offset, int count, int timeout);
89 int discard_buffer (int fd, gboolean input);
90 gint32 get_bytes_in_buffer (int fd, gboolean input);
91 gboolean is_baud_rate_legal (int baud_rate);
92 int setup_baud_rate (int baud_rate, gboolean *custom_baud_rate);
93 gboolean set_attributes (int fd, int baud_rate, MonoParity parity, int dataBits, MonoStopBits stopBits, MonoHandshake handshake);
94 MonoSerialSignal get_signals (int fd, gint32 *error);
95 gint32 set_signal (int fd, MonoSerialSignal signal, gboolean value);
96 int breakprop (int fd);
97 gboolean poll_serial (int fd, gint32 *error, int timeout);
98 void *list_serial_devices (void);
101 open_serial (char *devfile)
104 fd = open (devfile, O_RDWR | O_NOCTTY | O_NONBLOCK);
110 close_serial (int unix_fd)
112 // Linus writes: do not retry close after EINTR
113 return close (unix_fd);
117 read_serial (int fd, guchar *buffer, int offset, int count)
121 n = read (fd, buffer + offset, count);
127 write_serial (int fd, guchar *buffer, int offset, int count, int timeout)
133 pinfo.events = POLLOUT;
134 pinfo.revents = POLLOUT;
145 while ((c = poll (&pinfo, 1, timeout)) == -1 && errno == EINTR)
152 t = write (fd, buffer + offset, n);
153 } while (t == -1 && errno == EINTR);
166 discard_buffer (int fd, gboolean input)
168 return tcflush(fd, input ? TCIFLUSH : TCOFLUSH);
172 get_bytes_in_buffer (int fd, gboolean input)
176 if (ioctl (fd, input ? FIONREAD : TIOCOUTQ, &retval) == -1) {
184 is_baud_rate_legal (int baud_rate)
186 gboolean ignore = FALSE;
187 return setup_baud_rate (baud_rate, &ignore) != -1;
191 setup_baud_rate (int baud_rate, gboolean *custom_baud_rate)
195 /*Some values are not defined on OSX and *BSD */
272 *custom_baud_rate = TRUE;
279 set_attributes (int fd, int baud_rate, MonoParity parity, int dataBits, MonoStopBits stopBits, MonoHandshake handshake)
281 struct termios newtio;
282 gboolean custom_baud_rate = FALSE;
284 if (tcgetattr (fd, &newtio) == -1)
287 newtio.c_cflag |= (CLOCAL | CREAD);
288 newtio.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHOK | ECHONL | ISIG | IEXTEN );
289 newtio.c_oflag &= ~(OPOST);
290 newtio.c_iflag = IGNBRK;
293 baud_rate = setup_baud_rate (baud_rate, &custom_baud_rate);
296 newtio.c_cflag &= ~CSIZE;
300 newtio.c_cflag |= CS5;
303 newtio.c_cflag |= CS6;
306 newtio.c_cflag |= CS7;
310 newtio.c_cflag |= CS8;
321 /* do nothing, the default is one stop bit */
322 newtio.c_cflag &= ~CSTOPB;
325 newtio.c_cflag |= CSTOPB;
327 case OnePointFive: /* OnePointFive */
333 newtio.c_iflag &= ~(INPCK | ISTRIP );
337 case NoneParity: /* None */
338 newtio.c_cflag &= ~(PARENB | PARODD);
342 newtio.c_cflag |= PARENB | PARODD;
345 case Even: /* Even */
346 newtio.c_cflag &= ~(PARODD);
347 newtio.c_cflag |= (PARENB);
350 case Mark: /* Mark */
353 case Space: /* Space */
358 newtio.c_iflag &= ~(IXOFF | IXON);
360 newtio.c_cflag &= ~CRTSCTS;
361 #endif /* def CRTSCTS */
365 case NoneHandshake: /* None */
368 case RequestToSend: /* RequestToSend (RTS) */
370 newtio.c_cflag |= CRTSCTS;
371 #endif /* def CRTSCTS */
373 case RequestToSendXOnXOff: /* RequestToSendXOnXOff (RTS + XON/XOFF) */
375 newtio.c_cflag |= CRTSCTS;
376 #endif /* def CRTSCTS */
378 case XOnXOff: /* XOnXOff */
379 newtio.c_iflag |= IXOFF | IXON;
383 if (custom_baud_rate == FALSE) {
384 if (cfsetospeed (&newtio, baud_rate) < 0 || cfsetispeed (&newtio, baud_rate) < 0)
387 #if __linux__ || (defined(__APPLE__) && !defined(HOST_IOS))
389 /* On Linux to set a custom baud rate, we must set the
390 * "standard" baud_rate to 38400. On Apple we set it purely
391 * so that tcsetattr has something to use (and report back later), but
392 * the Apple specific API is still opaque to these APIs, see:
393 * https://developer.apple.com/library/mac/samplecode/SerialPortSample/Listings/SerialPortSample_SerialPortSample_c.html#//apple_ref/doc/uid/DTS10000454-SerialPortSample_SerialPortSample_c-DontLinkElementID_4
395 if (cfsetospeed (&newtio, B38400) < 0 || cfsetispeed (&newtio, B38400) < 0)
400 if (tcsetattr (fd, TCSANOW, &newtio) < 0)
403 if (custom_baud_rate == TRUE){
404 #if defined(HAVE_LINUX_SERIAL_H)
405 struct serial_struct ser;
407 if (ioctl (fd, TIOCGSERIAL, &ser) < 0)
412 ser.custom_divisor = ser.baud_base / baud_rate;
413 ser.flags &= ~ASYNC_SPD_MASK;
414 ser.flags |= ASYNC_SPD_CUST;
416 if (ioctl (fd, TIOCSSERIAL, &ser) < 0)
420 #elif defined(__APPLE__) && !defined(HOST_IOS)
421 speed_t speed = baud_rate;
422 if (ioctl(fd, IOSSIOSPEED, &speed) == -1)
425 /* Don't know how to set custom baud rate on this platform. */
435 get_signal_code (MonoSerialSignal signal)
456 static MonoSerialSignal
457 get_mono_signal_codes (int signals)
459 MonoSerialSignal retval = NoneSignal;
461 if ((signals & TIOCM_CAR) != 0)
463 if ((signals & TIOCM_CTS) != 0)
465 if ((signals & TIOCM_DSR) != 0)
467 if ((signals & TIOCM_DTR) != 0)
469 if ((signals & TIOCM_RTS) != 0)
476 get_signals (int fd, gint32 *error)
482 if (ioctl (fd, TIOCMGET, &signals) == -1) {
487 return get_mono_signal_codes (signals);
491 set_signal (int fd, MonoSerialSignal signal, gboolean value)
493 int signals, expected, activated;
495 expected = get_signal_code (signal);
496 if (ioctl (fd, TIOCMGET, &signals) == -1)
499 activated = (signals & expected) != 0;
500 if (activated == value) /* Already set */
506 signals &= ~expected;
508 if (ioctl (fd, TIOCMSET, &signals) == -1)
517 return tcsendbreak (fd, 0);
521 poll_serial (int fd, gint32 *error, int timeout)
528 pinfo.events = POLLIN;
531 while (poll (&pinfo, 1, timeout) == -1 && errno == EINTR) {
532 /* EINTR is an OK condition, we should not throw in the upper layer an IOException */
539 return (pinfo.revents & POLLIN) != 0 ? 1 : 0;
543 * mono internals should not be used here.
544 * this serial stuff needs to be implemented with icalls.
545 * make this at least compile until the code is moved elsewhere
546 * defined(linux) is wrong, too
549 list_serial_devices (void)
556 list_serial_devices (void)
560 /* Linux serial files are of the form ttyS[0-9]+ */
561 GSList *l, *list = NULL;
562 GDir* dir = g_dir_open ("/dev", 0, NULL);
563 const char *filename;
566 while ((filename = g_dir_read_name (dir))) {
568 if (!strncmp (filename, "ttyS", 4))
569 list = g_slist_append (list, g_strconcat ("/dev/", filename, NULL));
575 array = mono_array_new (mono_domain_get (), mono_get_string_class (), g_slist_length (list));
576 for (l = list; l; l = l->next) {
577 mono_array_set (array, gpointer, i++, mono_string_new (mono_domain_get (), (char*)l->data));
584 #warning "list_serial_devices isn't ported to this OS"