int gpsd_serial_open(struct gps_device_t *session)
/* open a device for access to its data */
{
mode_t mode = (mode_t) O_RDWR;
session->sourcetype = gpsd_classify(session->gpsdata.dev.path);
session->servicetype = service_sensor;
/*@ -boolops -type @*/
if (session->context->readonly
|| (session->sourcetype <= source_blockdev)) {
mode = (mode_t) O_RDONLY;
gpsd_report(LOG_INF,
"opening read-only GPS data source type %d and at '%s'\n",
(int)session->sourcetype, session->gpsdata.dev.path);
} else {
gpsd_report(LOG_INF,
"opening GPS data source type %d at '%s'\n",
(int)session->sourcetype, session->gpsdata.dev.path);
}
/*@ +boolops +type @*/
#ifdef HAVE_BLUEZ
if (bachk(session->gpsdata.dev.path) == 0) {
session->gpsdata.gps_fd = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
struct sockaddr_rc addr = { 0 };
addr.rc_family = AF_BLUETOOTH;
addr.rc_channel = (uint8_t) 1;
str2ba(session->gpsdata.dev.path, &addr.rc_bdaddr);
if (connect(session->gpsdata.gps_fd, (struct sockaddr *) &addr, sizeof (addr)) == -1) {
if (errno != EINPROGRESS && errno != EAGAIN) {
gpsd_report(LOG_ERROR, "bluetooth socket connect failed: %s\n",
strerror(errno));
return -1;
}
gpsd_report(LOG_ERROR, "bluetooth socket connect in progress or again : %s\n",
strerror(errno));
}
(void)fcntl(session->gpsdata.gps_fd, F_SETFL, (int)mode | O_NONBLOCK);
gpsd_report(LOG_PROG, "bluez device open success: %s %s\n",
session->gpsdata.dev.path, strerror(errno));
} else
#endif /* BLUEZ */
{
if ((session->gpsdata.gps_fd =
open(session->gpsdata.dev.path,
(int)(mode | O_NONBLOCK | O_NOCTTY))) == -1) {
gpsd_report(LOG_ERROR,
"device open failed: %s - retrying read-only\n",
strerror(errno));
if ((session->gpsdata.gps_fd =
open(session->gpsdata.dev.path,
O_RDONLY | O_NONBLOCK | O_NOCTTY)) == -1) {
gpsd_report(LOG_ERROR, "read-only device open failed: %s\n",
strerror(errno));
return -1;
}
gpsd_report(LOG_PROG, "file device open success: %s\n",
strerror(errno));
}
}
/*
* Ideally we want to exclusion-lock the device before doing any reads.
* It would have been best to do this at open(2) time, but O_EXCL
* doesn't work wuthout O_CREAT.
*
* We have to make an exception for ptys, which are intentionally
* opened by another process on the master side, otherwise we'll
* break all our regression tests.
*/
if (session->sourcetype != source_pty) {
/*
* Try to block other processes from using this device while we
* have it open (later opens should return EBUSY). Won't work
* against anything with root privileges, alas.
*/
(void)ioctl(session->gpsdata.gps_fd, (unsigned long)TIOCEXCL);
#ifdef __linux__
/*
* Don't touch devices already opened by another process.
*/
if (fusercount(session->gpsdata.dev.path) > 1) {
gpsd_report(LOG_ERROR,
"%s already opened by another process\n",
session->gpsdata.dev.path);
(void)close(session->gpsdata.gps_fd);
session->gpsdata.gps_fd = -1;
return -1;
}
#endif /* __linux__ */
}
#ifdef FIXED_PORT_SPEED
session->saved_baud = FIXED_PORT_SPEED;
#endif
if (session->saved_baud != -1) {
/*@i@*/ (void)
cfsetispeed(&session->ttyset, (speed_t) session->saved_baud);
/*@i@*/ (void)
cfsetospeed(&session->ttyset, (speed_t) session->saved_baud);
(void)tcsetattr(session->gpsdata.gps_fd, TCSANOW, &session->ttyset);
(void)tcflush(session->gpsdata.gps_fd, TCIOFLUSH);
}
session->packet.type = BAD_PACKET;
if (isatty(session->gpsdata.gps_fd) != 0) {
/* Save original terminal parameters */
if (tcgetattr(session->gpsdata.gps_fd, &session->ttyset_old) != 0)
return -1;
(void)memcpy(&session->ttyset,
&session->ttyset_old, sizeof(session->ttyset));
/*
* Only block until we get at least one character, whatever the
* third arg of read(2) says.
*/
/*@ ignore @*/
memset(session->ttyset.c_cc, 0, sizeof(session->ttyset.c_cc));
session->ttyset.c_cc[VMIN] = 1;
/*@ end @*/
/*
* Tip from Chris Kuethe: the FIDI chip used in the Trip-Nav
* 200 (and possibly other USB GPSes) gets completely hosed
* in the presence of flow control. Thus, turn off CRTSCTS.
*/
session->ttyset.c_cflag &= ~(PARENB | PARODD | CRTSCTS);
session->ttyset.c_cflag |= CREAD | CLOCAL;
session->ttyset.c_iflag = session->ttyset.c_oflag =
session->ttyset.c_lflag = (tcflag_t) 0;
#ifndef FIXED_PORT_SPEED
session->baudindex = 0;
#endif /* FIXED_PORT_SPEED */
gpsd_set_speed(session, gpsd_get_speed(&session->ttyset_old), 'N', 1);
}
gpsd_report(LOG_SPIN, "open(%s) -> %d in gpsd_serial_open()\n",
session->gpsdata.dev.path, session->gpsdata.gps_fd);
return session->gpsdata.gps_fd;
}
int gpsd_serial_open(struct gps_device_t *session)
/* open a device for access to its data
* return: the opened file descriptor
* PLACEHOLDING_FD - for /dev/ppsX
* UNALLOCATED_FD - for open failure
*/
{
mode_t mode = (mode_t) O_RDWR;
session->sourcetype = gpsd_classify(session->gpsdata.dev.path);
session->servicetype = service_sensor;
/* we may need to hold on to this slot without opening the device */
if (source_pps == session->sourcetype) {
(void)gpsd_switch_driver(session, "PPS");
return PLACEHOLDING_FD;
}
if (session->context->readonly
|| (session->sourcetype <= source_blockdev)) {
mode = (mode_t) O_RDONLY;
gpsd_log(&session->context->errout, LOG_INF,
"opening read-only GPS data source type %d and at '%s'\n",
(int)session->sourcetype, session->gpsdata.dev.path);
} else {
gpsd_log(&session->context->errout, LOG_INF,
"opening GPS data source type %d at '%s'\n",
(int)session->sourcetype, session->gpsdata.dev.path);
}
#ifdef ENABLE_BLUEZ
if (bachk(session->gpsdata.dev.path) == 0) {
struct sockaddr_rc addr = { 0, *BDADDR_ANY, 0};
session->gpsdata.gps_fd = socket(AF_BLUETOOTH,
SOCK_STREAM,
BTPROTO_RFCOMM);
addr.rc_family = AF_BLUETOOTH;
addr.rc_channel = (uint8_t) 1;
(void) str2ba(session->gpsdata.dev.path, &addr.rc_bdaddr);
if (connect(session->gpsdata.gps_fd, (struct sockaddr *) &addr, sizeof (addr)) == -1) {
if (errno != EINPROGRESS && errno != EAGAIN) {
(void)close(session->gpsdata.gps_fd);
gpsd_log(&session->context->errout, LOG_ERROR,
"bluetooth socket connect failed: %s\n",
strerror(errno));
return UNALLOCATED_FD;
}
gpsd_log(&session->context->errout, LOG_ERROR,
"bluetooth socket connect in progress or again : %s\n",
strerror(errno));
}
(void)fcntl(session->gpsdata.gps_fd, F_SETFL, (int)mode);
gpsd_log(&session->context->errout, LOG_PROG,
"bluez device open success: %s %s\n",
session->gpsdata.dev.path, strerror(errno));
} else
#endif /* BLUEZ */
{
/*
* We open with O_NONBLOCK because we want to now get hung if
* the clocal flag is off, but we don't want to stay in that mode.
*/
if ((session->gpsdata.gps_fd =
open(session->gpsdata.dev.path, (int)(mode | O_NONBLOCK | O_NOCTTY))) == -1) {
gpsd_log(&session->context->errout, LOG_ERROR,
"device open of %s failed: %s - retrying read-only\n",
session->gpsdata.dev.path,
strerror(errno));
if ((session->gpsdata.gps_fd =
open(session->gpsdata.dev.path, O_RDONLY | O_NONBLOCK | O_NOCTTY)) == -1) {
gpsd_log(&session->context->errout, LOG_ERROR,
"read-only device open of %s failed: %s\n",
session->gpsdata.dev.path,
strerror(errno));
return UNALLOCATED_FD;
}
gpsd_log(&session->context->errout, LOG_PROG,
"file device open of %s succeeded: %s\n",
session->gpsdata.dev.path,
strerror(errno));
}
}
/*
* Ideally we want to exclusion-lock the device before doing any reads.
* It would have been best to do this at open(2) time, but O_EXCL
* doesn't work without O_CREAT.
*
* We have to make an exception for ptys, which are intentionally
* opened by another process on the master side, otherwise we'll
* break all our regression tests.
*
* We also exclude bluetooth device because the bluetooth daemon opens them.
*/
if (!(session->sourcetype == source_pty || session->sourcetype == source_bluetooth)) {
#ifdef TIOCEXCL
/*
* Try to block other processes from using this device while we
* have it open (later opens should return EBUSY). Won't work
* against anything with root privileges, alas.
*/
(void)ioctl(session->gpsdata.gps_fd, (unsigned long)TIOCEXCL);
#endif /* TIOCEXCL */
#ifdef __linux__
/*
* Don't touch devices already opened by another process.
*/
if (fusercount(session->gpsdata.dev.path) > 1) {
gpsd_log(&session->context->errout, LOG_ERROR,
"%s already opened by another process\n",
session->gpsdata.dev.path);
(void)close(session->gpsdata.gps_fd);
session->gpsdata.gps_fd = UNALLOCATED_FD;
return UNALLOCATED_FD;
}
#endif /* __linux__ */
}
#ifdef FIXED_PORT_SPEED
session->saved_baud = FIXED_PORT_SPEED;
#endif
if (session->saved_baud != -1) {
(void)cfsetispeed(&session->ttyset, (speed_t)session->saved_baud);
(void)cfsetospeed(&session->ttyset, (speed_t)session->saved_baud);
(void)tcsetattr(session->gpsdata.gps_fd, TCSANOW, &session->ttyset);
(void)tcflush(session->gpsdata.gps_fd, TCIOFLUSH);
}
session->lexer.type = BAD_PACKET;
if (isatty(session->gpsdata.gps_fd) != 0) {
/* Save original terminal parameters */
if (tcgetattr(session->gpsdata.gps_fd, &session->ttyset_old) != 0)
return UNALLOCATED_FD;
session->ttyset = session->ttyset_old;
memset(session->ttyset.c_cc, 0, sizeof(session->ttyset.c_cc));
//session->ttyset.c_cc[VTIME] = 1;
/*
* Tip from Chris Kuethe: the FIDI chip used in the Trip-Nav
* 200 (and possibly other USB GPSes) gets completely hosed
* in the presence of flow control. Thus, turn off CRTSCTS.
*
* This is not ideal. Setting no parity here will mean extra
* initialization time for some devices, like certain Trimble
* boards, that want 7O2 or other non-8N1 settings. But starting
* the hunt loop at 8N1 will minimize the average sync time
* over all devices.
*/
session->ttyset.c_cflag &= ~(PARENB | PARODD | CRTSCTS | CSTOPB);
session->ttyset.c_cflag |= CREAD | CLOCAL;
session->ttyset.c_iflag = session->ttyset.c_oflag =
session->ttyset.c_lflag = (tcflag_t) 0;
#ifndef FIXED_PORT_SPEED
session->baudindex = 0;
#endif /* FIXED_PORT_SPEED */
gpsd_set_speed(session,
#ifdef FIXED_PORT_SPEED
FIXED_PORT_SPEED,
#else
gpsd_get_speed_old(session),
#endif /* FIXED_PORT_SPEED */
'N',
#ifdef FIXED_STOP_BITS
FIXED_STOP_BITS
#else
1
#endif /* FIXED_STOP_BITS */
);
}
/* Switch back to blocking I/O now that CLOCAL is set. */
{
int oldfl = fcntl(session->gpsdata.gps_fd, F_GETFL);
if (oldfl != -1)
(void)fcntl(session->gpsdata.gps_fd, F_SETFL, oldfl & ~O_NONBLOCK);
}
/* required so parity field won't be '\0' if saved speed matches */
if (session->sourcetype <= source_blockdev) {
session->gpsdata.dev.parity = 'N';
session->gpsdata.dev.stopbits = 1;
}
gpsd_log(&session->context->errout, LOG_SPIN,
"open(%s) -> %d in gpsd_serial_open()\n",
session->gpsdata.dev.path, session->gpsdata.gps_fd);
return session->gpsdata.gps_fd;
}
