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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* serial port functions
*
* Author: Chris Toshok <toshok@ximian.com>
*/
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/poll.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <glib.h>
/* This is for FIONREAD on solaris */
#if defined(sun)
#include <sys/filio.h>
#endif
/* sys/time.h (for timeval) is required when using osx 10.3 (but not 10.4) */
#ifdef __APPLE__
#include <sys/time.h>
#endif
/* This is a copy of System.IO.Ports.Handshake */
typedef enum {
NoneHandshake = 0,
XOnXOff = 1,
RequestToSend = 2,
RequestToSendXOnXOff = 3
} MonoHandshake;
/* This is a copy of System.IO.Ports.Parity */
typedef enum {
NoneParity = 0,
Odd = 1,
Even = 2,
Mark = 3,
Space = 4
} MonoParity;
/* This is a copy of System.IO.Ports.StopBits */
typedef enum {
NoneStopBits = 0,
One = 1,
Two = 2,
OnePointFive = 3
} MonoStopBits;
/* This is a copy of System.IO.Ports.SerialSignal */
typedef enum {
NoneSignal,
Cd = 1, /* Carrier detect */
Cts = 2, /* Clear to send */
Dsr = 4, /* Data set ready */
Dtr = 8, /* Data terminal ready */
Rts = 16 /* Request to send */
} MonoSerialSignal;
int
open_serial (char* devfile)
{
int fd;
fd = open (devfile, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd == -1)
return -1;
return fd;
}
void
close_serial (int unix_fd)
{
close (unix_fd);
}
guint32
read_serial (int fd, guchar *buffer, int offset, int count)
{
guint32 n;
n = read (fd, buffer + offset, count);
return (guint32) n;
}
int
write_serial (int fd, guchar *buffer, int offset, int count, int timeout)
{
struct pollfd pinfo;
guint32 n;
pinfo.fd = fd;
pinfo.events = POLLOUT;
pinfo.revents = POLLOUT;
n = count;
while (n > 0)
{
size_t t;
if (timeout != 0) {
int c;
while ((c = poll (&pinfo, 1, timeout)) == -1 && errno == EINTR)
;
if (c == -1)
return -1;
}
do {
t = write (fd, buffer + offset, n);
} while (t == -1 && errno == EINTR);
if (t < 0)
return -1;
offset += t;
n -= t;
}
return 0;
}
void
discard_buffer (int fd, gboolean input)
{
tcflush(fd, input ? TCIFLUSH : TCOFLUSH);
}
gint32
get_bytes_in_buffer (int fd, gboolean input)
{
gint32 retval;
if (ioctl (fd, input ? FIONREAD : TIOCOUTQ, &retval) == -1) {
return -1;
}
return retval;
}
gboolean
set_attributes (int fd, int baud_rate, MonoParity parity, int dataBits, MonoStopBits stopBits, MonoHandshake handshake)
{
struct termios newtio;
tcgetattr (fd, &newtio);
newtio.c_cflag |= (CLOCAL | CREAD);
newtio.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHOK | ECHONL | ISIG | IEXTEN );
newtio.c_oflag &= ~(OPOST);
newtio.c_iflag = IGNBRK;
/* setup baudrate */
switch (baud_rate)
{
case 230400:
baud_rate = B230400;
break;
case 115200:
baud_rate = B115200;
break;
case 57600:
baud_rate = B57600;
break;
case 38400:
baud_rate = B38400;
break;
case 19200:
baud_rate = B19200;
break;
case 9600:
baud_rate = B9600;
break;
case 4800:
baud_rate = B4800;
break;
case 2400:
baud_rate = B2400;
break;
case 1800:
baud_rate = B1800;
break;
case 1200:
baud_rate = B1200;
break;
case 600:
baud_rate = B600;
break;
case 300:
baud_rate = B300;
break;
case 200:
baud_rate = B200;
break;
case 150:
baud_rate = B150;
break;
case 134:
baud_rate = B134;
break;
case 110:
baud_rate = B110;
break;
case 75:
baud_rate = B75;
break;
case 50:
case 0:
default:
baud_rate = B9600;
break;
}
/* char lenght */
newtio.c_cflag &= ~CSIZE;
switch (dataBits)
{
case 5:
newtio.c_cflag |= CS5;
break;
case 6:
newtio.c_cflag |= CS6;
break;
case 7:
newtio.c_cflag |= CS7;
break;
case 8:
default:
newtio.c_cflag |= CS8;
break;
}
/* stopbits */
switch (stopBits)
{
case NoneStopBits:
/* Unhandled */
break;
case One: /* One */
/* do nothing, the default is one stop bit */
newtio.c_cflag &= ~CSTOPB;
break;
case Two: /* Two */
newtio.c_cflag |= CSTOPB;
break;
case OnePointFive: /* OnePointFive */
/* XXX unhandled */
break;
}
/* parity */
newtio.c_iflag &= ~(INPCK | ISTRIP );
switch (parity)
{
case NoneParity: /* None */
newtio.c_cflag &= ~(PARENB | PARODD);
break;
case Odd: /* Odd */
newtio.c_cflag |= PARENB | PARODD;
break;
case Even: /* Even */
newtio.c_cflag &= ~(PARODD);
newtio.c_cflag |= (PARENB);
break;
case Mark: /* Mark */
/* XXX unhandled */
break;
case Space: /* Space */
/* XXX unhandled */
break;
}
newtio.c_iflag &= ~(IXOFF | IXON);
#ifdef CRTSCTS
newtio.c_cflag &= ~CRTSCTS;
#endif /* def CRTSCTS */
switch (handshake)
{
case NoneHandshake: /* None */
/* do nothing */
break;
case RequestToSend: /* RequestToSend (RTS) */
#ifdef CRTSCTS
newtio.c_cflag |= CRTSCTS;
#endif /* def CRTSCTS */
break;
case RequestToSendXOnXOff: /* RequestToSendXOnXOff (RTS + XON/XOFF) */
#ifdef CRTSCTS
newtio.c_cflag |= CRTSCTS;
#endif /* def CRTSCTS */
/* fall through */
case XOnXOff: /* XOnXOff */
newtio.c_iflag |= IXOFF | IXON;
break;
}
if (cfsetospeed (&newtio, baud_rate) < 0 || cfsetispeed (&newtio, baud_rate) < 0 ||
tcsetattr (fd, TCSANOW, &newtio) < 0)
{
return FALSE;
}
else
{
return TRUE;
}
}
static gint32
get_signal_code (MonoSerialSignal signal)
{
switch (signal) {
case Cd:
return TIOCM_CAR;
case Cts:
return TIOCM_CTS;
case Dsr:
return TIOCM_DSR;
case Dtr:
return TIOCM_DTR;
case Rts:
return TIOCM_RTS;
default:
return 0;
}
/* Not reached */
return 0;
}
static MonoSerialSignal
get_mono_signal_codes (int signals)
{
MonoSerialSignal retval = NoneSignal;
if ((signals & TIOCM_CAR) != 0)
retval |= Cd;
if ((signals & TIOCM_CTS) != 0)
retval |= Cts;
if ((signals & TIOCM_DSR) != 0)
retval |= Dsr;
if ((signals & TIOCM_DTR) != 0)
retval |= Dtr;
if ((signals & TIOCM_RTS) != 0)
retval |= Rts;
return retval;
}
MonoSerialSignal
get_signals (int fd, gint32 *error)
{
int signals;
*error = 0;
if (ioctl (fd, TIOCMGET, &signals) == -1) {
*error = -1;
return NoneSignal;
}
return get_mono_signal_codes (signals);
}
gint32
set_signal (int fd, MonoSerialSignal signal, gboolean value)
{
int signals, expected, activated;
expected = get_signal_code (signal);
if (ioctl (fd, TIOCMGET, &signals) == -1)
return -1;
activated = (signals & expected) != 0;
if (activated == value) /* Already set */
return 1;
if (value)
signals |= expected;
else
signals &= ~expected;
if (ioctl (fd, TIOCMSET, &signals) == -1)
return -1;
return 1;
}
void
breakprop (int fd)
{
tcsendbreak (fd, 0);
}
gboolean
poll_serial (int fd, gint32 *error, int timeout)
{
struct pollfd pinfo;
*error = 0;
pinfo.fd = fd;
pinfo.events = POLLIN;
pinfo.revents = 0;
while (poll (&pinfo, 1, timeout) == -1 && errno == EINTR) {
/* EINTR is an OK condition, we should not throw in the upper layer an IOException */
if (errno != EINTR){
*error = -1;
return FALSE;
}
}
return (pinfo.revents & POLLIN) != 0 ? 1 : 0;
}
/*
* mono internals should not be used here.
* this serial stuff needs to be implemented with icalls.
* make this at least compile until the code is moved elsewhere
* defined(linux) is wrong, too
*/
void*
list_serial_devices (void)
{
return NULL;
}
#if 0
MonoArray *
list_serial_devices (void)
{
MonoArray *array;
#if defined(linux)
/* Linux serial files are of the form ttyS[0-9]+ */
GSList *l, *list = NULL;
GDir* dir = g_dir_open ("/dev", 0, NULL);
const char *filename;
int i = 0;
while ((filename = g_dir_read_name (dir))) {
if (filename) {
if (!strncmp (filename, "ttyS", 4))
list = g_slist_append (list, g_strconcat ("/dev/", filename, NULL));
}
}
g_dir_close (dir);
array = mono_array_new (mono_domain_get (), mono_get_string_class (), g_slist_length (list));
for (l = list; l; l = l->next) {
mono_array_set (array, gpointer, i++, mono_string_new (mono_domain_get (), (char*)l->data));
g_free (l->data);
}
g_slist_free (list);
#else
#warning "list_serial_devices isn't ported to this OS"
#endif
return array;
}
#endif
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