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/*
* This file is Copyright (c) 2010 by the GPSD project
* BSD terms apply: see the file COPYING in the distribution root for details.
*/
/* cfmakeraw() needs _DEFAULT_SOURCE */
#define _DEFAULT_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/param.h> /* defines BSD */
#ifdef __linux__
#include <sys/sysmacros.h> /* defines major() */
#endif /* __linux__ */
#include "gpsd_config.h"
#ifdef ENABLE_BLUEZ
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/rfcomm.h>
#endif /* ENABLE_BLUEZ */
#include "gpsd.h"
/* Workaround for HP-UX 11.23, which is missing CRTSCTS */
#ifndef CRTSCTS
# ifdef CNEW_RTSCTS
# define CRTSCTS CNEW_RTSCTS
# else
# define CRTSCTS 0
# endif /* CNEW_RTSCTS */
#endif /* !CRTSCTS */
static sourcetype_t gpsd_classify(const char *path)
/* figure out what kind of device we're looking at */
{
struct stat sb;
if (stat(path, &sb) == -1)
return source_unknown;
else if (S_ISREG(sb.st_mode))
return source_blockdev;
/* this assumes we won't get UDP from a filesystem socket */
else if (S_ISSOCK(sb.st_mode))
return source_tcp;
/* OS-independent check for ptys using Unix98 naming convention */
else if (strncmp(path, "/dev/pts/", 9) == 0)
return source_pty;
else if (strncmp(path, "/dev/pps", 8) == 0)
return source_pps;
else if (S_ISFIFO(sb.st_mode))
return source_pipe;
else if (S_ISCHR(sb.st_mode)) {
sourcetype_t devtype = source_rs232;
#ifdef __linux__
/* Linux major device numbers live here
*
* https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/devices.txt
*
* Note: This code works because Linux major device numbers are
* stable and architecture-independent. It is *not* a good model
* for other Unixes where either or both assumptions may break.
*/
int devmajor = major(sb.st_rdev);
/* 207 are Freescale i.MX UARTs (ttymxc*) */
if (devmajor == 4 || devmajor == 204 || devmajor == 207)
devtype = source_rs232;
else if (devmajor == 188 || devmajor == 166)
devtype = source_usb;
else if (devmajor == 216 || devmajor == 217)
devtype = source_bluetooth;
else if (devmajor == 3 || (devmajor >= 136 && devmajor <= 143))
devtype = source_pty;
#endif /* __linux__ */
/*
* See http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system
* for discussion how this works. Key graphs:
*
* Compilers for the old BSD base for these distributions
* defined the __bsdi__ macro, but none of these distributions
* define it now. This leaves no generic "BSD" macro defined
* by the compiler itself, but all UNIX-style OSes provide a
* <sys/param.h> file. On BSD distributions, and only on BSD
* distributions, this file defines a BSD macro that's set to
* the OS version. Checking for this generic macro is more
* robust than looking for known BSD distributions with
* __DragonFly__, __FreeBSD__, __NetBSD__, and __OpenBSD__
* macros.
*
* Apple's OSX for the Mac and iOS for iPhones and iPads are
* based in part on a fork of FreeBSD distributed as
* Darwin. As such, OSX and iOS also define the BSD macro
* within <sys/param.h>. However, compilers for OSX, iOS, and
* Darwin do not define __unix__. To detect all BSD OSes,
* including OSX, iOS, and Darwin, use an #if/#endif that
* checks for __unix__ along with __APPLE__ and __MACH__ (see
* the later section on OSX and iOS).
*/
#ifdef BSD
/*
* Hacky check for pty, which is what really matters for avoiding
* adaptive delay.
*/
if (strncmp(path, "/dev/ttyp", 9) == 0 ||
strncmp(path, "/dev/ttyq", 9) == 0)
devtype = source_pty;
else if (strncmp(path, "/dev/ttyU", 9) == 0 ||
strncmp(path, "/dev/dtyU", 9) == 0)
devtype = source_usb;
/* XXX bluetooth */
#endif /* BSD */
return devtype;
} else
return source_unknown;
}
#ifdef __linux__
#include <dirent.h>
#include <ctype.h>
static int fusercount(const char *path)
/* return true if any process has the specified path open */
{
DIR *procd, *fdd;
struct dirent *procentry, *fdentry;
char procpath[32], fdpath[64], linkpath[64];
int cnt = 0;
if ((procd = opendir("/proc")) == NULL)
return -1;
while ((procentry = readdir(procd)) != NULL) {
if (isdigit(procentry->d_name[0])==0)
continue;
(void)snprintf(procpath, sizeof(procpath),
"/proc/%s/fd/", procentry->d_name);
if ((fdd = opendir(procpath)) == NULL)
continue;
while ((fdentry = readdir(fdd)) != NULL) {
(void)strlcpy(fdpath, procpath, sizeof(fdpath));
(void)strlcat(fdpath, fdentry->d_name, sizeof(fdpath));
(void)memset(linkpath, '\0', sizeof(linkpath));
if (readlink(fdpath, linkpath, sizeof(linkpath)) == -1)
continue;
if (strcmp(linkpath, path) == 0) {
++cnt;
}
}
(void)closedir(fdd);
}
(void)closedir(procd);
return cnt;
}
#endif /* __linux__ */
void gpsd_tty_init(struct gps_device_t *session)
/* to be called on allocating a device */
{
/* mark GPS fd closed and its baud rate unknown */
session->gpsdata.gps_fd = -1;
session->saved_baud = -1;
session->zerokill = false;
session->reawake = (time_t)0;
}
#if defined(__CYGWIN__)
/* Workaround for Cygwin, which is missing cfmakeraw */
/* Pasted from man page; added in serial.c arbitrarily */
void cfmakeraw(struct termios *termios_p)
{
termios_p->c_iflag &=
~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
termios_p->c_oflag &= ~OPOST;
termios_p->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
termios_p->c_cflag &= ~(CSIZE | PARENB);
termios_p->c_cflag |= CS8;
}
#endif /* defined(__CYGWIN__) */
static speed_t gpsd_get_speed_termios(const struct termios *ttyctl)
{
speed_t code = cfgetospeed(ttyctl);
switch (code) {
case B300:
return (300);
case B1200:
return (1200);
case B2400:
return (2400);
case B4800:
return (4800);
case B9600:
return (9600);
case B19200:
return (19200);
case B38400:
return (38400);
case B57600:
return (57600);
case B115200:
return (115200);
case B230400:
return (230400);
default: /* B0 */
return 0;
}
}
speed_t gpsd_get_speed(const struct gps_device_t *dev)
{
return gpsd_get_speed_termios(&dev->ttyset);
}
speed_t gpsd_get_speed_old(const struct gps_device_t *dev)
{
return gpsd_get_speed_termios(&dev->ttyset_old);
}
char gpsd_get_parity(const struct gps_device_t *dev)
{
char parity = 'N';
if ((dev->ttyset.c_cflag & (PARENB | PARODD)) == (PARENB | PARODD))
parity = 'O';
else if ((dev->ttyset.c_cflag & PARENB) == PARENB)
parity = 'E';
return parity;
}
int gpsd_get_stopbits(const struct gps_device_t *dev)
{
int stopbits = 0;
if ((dev->ttyset.c_cflag & CS8) == CS8)
stopbits = 1;
else if ((dev->ttyset.c_cflag & (CS7 | CSTOPB)) == (CS7 | CSTOPB))
stopbits = 2;
return stopbits;
}
bool gpsd_set_raw(struct gps_device_t * session)
{
(void)cfmakeraw(&session->ttyset);
if (tcsetattr(session->gpsdata.gps_fd, TCIOFLUSH, &session->ttyset) == -1) {
gpsd_log(&session->context->errout, LOG_ERROR,
"SER: error changing port attributes: %s\n", strerror(errno));
return false;
}
return true;
}
void gpsd_set_speed(struct gps_device_t *session,
speed_t speed, char parity, unsigned int stopbits)
{
speed_t rate;
struct timespec delay;
/*
* Yes, you can set speeds that aren't in the hunt loop. If you
* do this, and you aren't on Linux where baud rate is preserved
* across port closings, you've screwed yourself. Don't do that!
*/
if (speed < 300)
rate = B0;
else if (speed < 1200)
rate = B300;
else if (speed < 2400)
rate = B1200;
else if (speed < 4800)
rate = B2400;
else if (speed < 9600)
rate = B4800;
else if (speed < 19200)
rate = B9600;
else if (speed < 38400)
rate = B19200;
else if (speed < 57600)
rate = B38400;
else if (speed < 115200)
rate = B57600;
else if (speed < 230400)
rate = B115200;
else
rate = B230400;
if (rate != cfgetispeed(&session->ttyset)
|| parity != session->gpsdata.dev.parity
|| stopbits != session->gpsdata.dev.stopbits) {
/*
* Don't mess with this conditional! Speed zero is supposed to mean
* to leave the port speed at whatever it currently is. This leads
* to excellent behavior on Linux, which preserves baudrate across
* serial device closes - it means that if you've opended this
* device before you typically don't have to hunt at all because
* it's still at the same speed you left it - you'll typically
* get packet lock within 1.5 seconds. Alas, the BSDs and OS X
* aren't so nice.
*/
if (rate != B0) {
(void)cfsetispeed(&session->ttyset, rate);
(void)cfsetospeed(&session->ttyset, rate);
}
session->ttyset.c_iflag &= ~(PARMRK | INPCK);
session->ttyset.c_cflag &= ~(CSIZE | CSTOPB | PARENB | PARODD);
session->ttyset.c_cflag |= (stopbits == 2 ? CS7 | CSTOPB : CS8);
switch (parity) {
case 'E':
case (char)2:
session->ttyset.c_iflag |= INPCK;
session->ttyset.c_cflag |= PARENB;
break;
case 'O':
case (char)1:
session->ttyset.c_iflag |= INPCK;
session->ttyset.c_cflag |= PARENB | PARODD;
break;
}
if (tcsetattr(session->gpsdata.gps_fd, TCSANOW, &session->ttyset) != 0) {
/* strangely this fails on non-serial ports, but if
* we do not try, we get other failures.
* so ignore for now, as we always have, until it can
* be nailed down.
*
* gpsd_log(&session->context->errout, LOG_ERROR,
* "SER: error setting port attributes: %s, sourcetype: %d\n",
* strerror(errno), session->sourcetype);
* return;
*/
}
/*
* Serious black magic begins here. Getting this code wrong can cause
* failures to lock to a correct speed, and not clean reproducible
* failures but flukey hardware- and timing-dependent ones. So
* be very sure you know what you're doing before hacking it, and
* test thoroughly.
*
* The fundamental problem here is that serial devices take time
* to settle into a new baud rate after tcsetattr() is issued. Until
* they do so, input will be arbitarily garbled. Normally this
* is not a big problem, but in our hunt loop the garbling can trash
* a long enough prefix of each sample to prevent detection of a
* packet header. We could address the symptom by making the sample
* size enough larger that subtracting the maximum length of garble
* would still leave a sample longer than the maximum packet size.
* But it's better (and more efficient) to address the disease.
*
* In theory, one might think that not even a tcflush() call would
* be needed, with tcsetattr() delaying its return until the device
* is in a good state. For simple devices like a 14550 UART that
* have fixed response timings this may even work, if the driver
* writer was smart enough to delay the return by the right number
* of milliseconds after poking the device port(s).
*
* Problems may arise if the driver's timings are off. Or we may
* be talking to a USB device like the pl2303 commonly used in GPS
* mice; on these, the change will not happen immediately because
* it has to be sent as a message to the external processor that
* has to act upon it, and that processor may still have buffered
* data in its own FIFO. In this case the expected delay may be
* too large and too variable (depending on the details of how the
* USB device is integrated with its symbiont hardware) to be put
* in the driver.
*
* So, somehow, we have to introduce a delay after tcsatattr()
* returns sufficient to allow *any* device to settle. On the other
* hand, a really long delay will make gpsd device registration
* unpleasantly laggy.
*
* The classic way to address this is with a tcflush(), counting
* on it to clear the device FIFO. But that call may clear only the
* kernel buffers, not the device's hardware FIFO, so it may not
* be sufficient by itself.
*
* flush followed by a 200-millisecond delay followed by flush has
* been found to work reliably on the pl2303. It is also known
* from testing that a 100-millisec delay is too short, allowing
* occasional failure to lock.
*/
(void)tcflush(session->gpsdata.gps_fd, TCIOFLUSH);
/* wait 200,000 uSec */
delay.tv_sec = 0;
delay.tv_nsec = 200000000L;
nanosleep(&delay, NULL);
(void)tcflush(session->gpsdata.gps_fd, TCIOFLUSH);
}
gpsd_log(&session->context->errout, LOG_INF,
"SER: speed %lu, %d%c%d\n",
(unsigned long)gpsd_get_speed(session), 9 - stopbits, parity,
stopbits);
session->gpsdata.dev.baudrate = (unsigned int)speed;
session->gpsdata.dev.parity = parity;
session->gpsdata.dev.stopbits = stopbits;
/*
* The device might need a wakeup string before it will send data.
* If we don't know the device type, ship it every driver's wakeup
* in hopes it will respond. But not to USB or Bluetooth, because
* shipping probe strings to unknown USB serial adaptors or
* Bluetooth devices may spam devices that aren't GPSes at all and
* could become confused.
*/
if (!session->context->readonly
&& session->sourcetype != source_usb
&& session->sourcetype != source_bluetooth) {
if (isatty(session->gpsdata.gps_fd) != 0
&& !session->context->readonly) {
if (session->device_type == NULL) {
const struct gps_type_t **dp;
for (dp = gpsd_drivers; *dp; dp++)
if ((*dp)->event_hook != NULL)
(*dp)->event_hook(session, event_wakeup);
} else if (session->device_type->event_hook != NULL)
session->device_type->event_hook(session, event_wakeup);
}
}
packet_reset(&session->lexer);
}
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,
"SER: 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,
"SER: 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,
"SER: bluetooth socket connect failed: %s\n",
strerror(errno));
return UNALLOCATED_FD;
}
gpsd_log(&session->context->errout, LOG_ERROR,
"SER: 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,
"SER: 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 not get hung if
* the clocal flag is off, but we don't want to stay in that mode.
*/
errno = 0;
if ((session->gpsdata.gps_fd =
open(session->gpsdata.dev.path, (int)(mode | O_NONBLOCK | O_NOCTTY))) == -1) {
gpsd_log(&session->context->errout, LOG_ERROR,
"SER: 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,
"SER: 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,
"SER: file device open of %s succeeded\n",
session->gpsdata.dev.path);
}
}
/*
* 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,
"SER: %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);
if (tcsetattr(session->gpsdata.gps_fd, TCSANOW, &session->ttyset) != 0) {
gpsd_log(&session->context->errout, LOG_ERROR,
"SER: Error setting port attributes: %s\n",
strerror(errno));
}
(void)tcflush(session->gpsdata.gps_fd, TCIOFLUSH);
}
session->lexer.type = BAD_PACKET;
if ( 0 != isatty(session->gpsdata.gps_fd) ) {
/* Save original terminal parameters */
if (tcgetattr(session->gpsdata.gps_fd, &session->ttyset_old) != 0)
return UNALLOCATED_FD;
session->ttyset = session->ttyset_old;
/* twiddle the speed, parity, etc. but only on real serial ports */
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 */
);
}
/* Probably want to switch back to blocking I/O now that CLOCAL is set. */
if (session->sourcetype != source_pipe)
{
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,
"SER: open(%s) -> %d in gpsd_serial_open()\n",
session->gpsdata.dev.path, session->gpsdata.gps_fd);
return session->gpsdata.gps_fd;
}
ssize_t gpsd_serial_write(struct gps_device_t * session,
const char *buf, const size_t len)
{
ssize_t status;
bool ok;
if (session == NULL ||
session->context == NULL || session->context->readonly)
return 0;
status = write(session->gpsdata.gps_fd, buf, len);
ok = (status == (ssize_t) len);
(void)tcdrain(session->gpsdata.gps_fd);
/* extra guard prevents expensive hexdump calls */
if (session->context->errout.debug >= LOG_IO) {
char scratchbuf[MAX_PACKET_LENGTH*2+1];
gpsd_log(&session->context->errout, LOG_IO,
"SER: => GPS: %s%s\n",
gpsd_packetdump(scratchbuf, sizeof(scratchbuf),
(char *)buf, len), ok ? "" : " FAILED");
}
return status;
}
/*
* This constant controls how long the packet sniffer will spend looking
* for a packet leader before it gives up. It *must* be larger than
* MAX_PACKET_LENGTH or we risk never syncing up at all. Large values
* will produce annoying startup lag.
*/
#define SNIFF_RETRIES (MAX_PACKET_LENGTH + 128)
bool gpsd_next_hunt_setting(struct gps_device_t * session)
/* advance to the next hunt setting */
{
/* don't waste time in the hunt loop if this is not actually a tty */
if (isatty(session->gpsdata.gps_fd) == 0)
return false;
/* ...or if it's nominally a tty but delivers only PPS and no data */
if (session->sourcetype == source_pps)
return false;
if (session->lexer.retry_counter++ >= SNIFF_RETRIES) {
#ifdef FIXED_PORT_SPEED
return false;
#else
/* every rate we're likely to see on a GPS */
static unsigned int rates[] =
{ 0, 4800, 9600, 19200, 38400, 57600, 115200, 230400};
if (session->baudindex++ >=
(unsigned int)(sizeof(rates) / sizeof(rates[0])) - 1) {
session->baudindex = 0;
#ifdef FIXED_STOP_BITS
return false; /* hunt is over, no sync */
#else
if (session->gpsdata.dev.stopbits++ >= 2)
return false; /* hunt is over, no sync */
#endif /* FIXED_STOP_BITS */
}
#endif /* FIXED_PORT_SPEED */
// cppcheck-suppress unreachableCode
gpsd_set_speed(session,
#ifdef FIXED_PORT_SPEED
FIXED_PORT_SPEED,
#else
rates[session->baudindex],
#endif /* FIXED_PORT_SPEED */
session->gpsdata.dev.parity,
#ifdef FIXED_STOP_BITS
FIXED_STOP_BITS
#else
session->gpsdata.dev.stopbits
#endif /* FIXED_STOP_BITS */
);
session->lexer.retry_counter = 0;
}
return true; /* keep hunting */
}
void gpsd_assert_sync(struct gps_device_t *session)
/* to be called when we want to register that we've synced with a device */
{
/*
* We've achieved first sync with the device. Remember the
* baudrate so we can try it first next time this device
* is opened.
*/
if (session->saved_baud == -1)
session->saved_baud = (int)cfgetispeed(&session->ttyset);
}
void gpsd_close(struct gps_device_t *session)
{
if (!BAD_SOCKET(session->gpsdata.gps_fd)) {
#ifdef TIOCNXCL
(void)ioctl(session->gpsdata.gps_fd, (unsigned long)TIOCNXCL);
#endif /* TIOCNXCL */
(void)tcdrain(session->gpsdata.gps_fd);
if (isatty(session->gpsdata.gps_fd) != 0) {
/* force hangup on close on systems that don't do HUPCL properly */
(void)cfsetispeed(&session->ttyset, (speed_t) B0);
(void)cfsetospeed(&session->ttyset, (speed_t) B0);
(void)tcsetattr(session->gpsdata.gps_fd, TCSANOW,
&session->ttyset);
}
/* this is the clean way to do it */
session->ttyset_old.c_cflag |= HUPCL;
/*
* Don't revert the serial parameters if we didn't have to mess with
* them the first time. Economical, and avoids tripping over an
* obscure Linux 2.6 kernel bug that disables threaded
* ioctl(TIOCMWAIT) on a device after tcsetattr() is called.
*/
if (cfgetispeed(&session->ttyset_old) != cfgetispeed(&session->ttyset) || (session->ttyset_old.c_cflag & CSTOPB) != (session->ttyset.c_cflag & CSTOPB)) {
/*
* If we revert, keep the most recent baud rate.
* Cuts down on autobaud overhead the next time.
*/
(void)cfsetispeed(&session->ttyset_old,
(speed_t) session->gpsdata.dev.baudrate);
(void)cfsetospeed(&session->ttyset_old,
(speed_t) session->gpsdata.dev.baudrate);
(void)tcsetattr(session->gpsdata.gps_fd, TCSANOW,
&session->ttyset_old);
}
gpsd_log(&session->context->errout, LOG_SPIN,
"SER: close(%d) in gpsd_close(%s)\n",
session->gpsdata.gps_fd, session->gpsdata.dev.path);
(void)close(session->gpsdata.gps_fd);
session->gpsdata.gps_fd = -1;
}
}
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