/*
* refclock_open - open serial port for reference clock
*
* This routine opens a serial port for I/O and sets default options. It
* returns the file descriptor if success and zero if failure.
*/
int
refclock_open(
char *dev, /* device name pointer */
u_int speed, /* serial port speed (code) */
u_int lflags /* line discipline flags */
)
{
int fd;
int omode;
#ifdef O_NONBLOCK
char trash[128]; /* litter bin for old input data */
#endif
/*
* Open serial port and set default options
*/
omode = O_RDWR;
#ifdef O_NONBLOCK
omode |= O_NONBLOCK;
#endif
#ifdef O_NOCTTY
omode |= O_NOCTTY;
#endif
fd = open(dev, omode, 0777);
if (fd < 0) {
msyslog(LOG_ERR, "refclock_open %s: %m", dev);
return (0);
}
NTP_INSIST(fd != 0);
if (!refclock_setup(fd, speed, lflags)) {
close(fd);
return (0);
}
if (!refclock_ioctl(fd, lflags)) {
close(fd);
return (0);
}
#ifdef O_NONBLOCK
/*
* We want to make sure there is no pending trash in the input
* buffer. Since we have non-blocking IO available, this is a
* good moment to read and dump all available outdated stuff
* that might have become toxic for the driver.
*/
while (read(fd, trash, sizeof(trash)) > 0 || errno == EINTR)
/*NOP*/;
#endif
return (fd);
}
/*
* refclock_open - open serial port for reference clock
*
* This routine opens a serial port for I/O and sets default options. It
* returns the file descriptor if success and zero if failure.
*/
int
refclock_open(
char *dev, /* device name pointer */
u_int speed, /* serial port speed (code) */
u_int lflags /* line discipline flags */
)
{
int fd;
int omode;
/*
* Open serial port and set default options
*/
omode = O_RDWR;
#ifdef O_NONBLOCK
omode |= O_NONBLOCK;
#endif
#ifdef O_NOCTTY
omode |= O_NOCTTY;
#endif
fd = open(dev, omode, 0777);
if (fd < 0) {
msyslog(LOG_ERR, "refclock_open %s: %m", dev);
return (0);
}
if (!refclock_setup(fd, speed, lflags)) {
close(fd);
return (0);
}
if (!refclock_ioctl(fd, lflags)) {
close(fd);
return (0);
}
return (fd);
}
/*
* refclock_open - open serial port for reference clock
*
* This routine opens a serial port for I/O and sets default options. It
* returns the file descriptor if success and zero if failure.
*/
int
refclock_open(
char *dev, /* device name pointer */
int speed, /* serial port speed (code) */
int lflags /* line discipline flags */
)
{
int fd, i;
int flags;
TTY ttyb, *ttyp;
#ifdef TIOCMGET
u_long ltemp;
#endif /* TIOCMGET */
int omode;
/*
* Open serial port and set default options
*/
flags = lflags;
omode = O_RDWR;
#ifdef O_NONBLOCK
omode |= O_NONBLOCK;
#endif
#ifdef O_NOCTTY
omode |= O_NOCTTY;
#endif
fd = open(dev, omode, 0777);
if (fd < 0) {
msyslog(LOG_ERR, "refclock_open: %s: %m", dev);
return (0);
}
/*
* This little jewel lights up the PPS file descriptor if the
* device name matches the name in the pps line in the
* configuration file. This is so the atom driver can glom onto
* the right device. Very silly.
*/
if (strcmp(dev, pps_device) == 0)
fdpps = fd;
/*
* The following sections initialize the serial line port in
* canonical (line-oriented) mode and set the specified line
* speed, 8 bits and no parity. The modem control, break, erase
* and kill functions are normally disabled. There is a
* different section for each terminal interface, as selected at
* compile time.
*/
ttyp = &ttyb;
#ifdef HAVE_TERMIOS
/*
* POSIX serial line parameters (termios interface)
*/
if (tcgetattr(fd, ttyp) < 0) {
msyslog(LOG_ERR,
"refclock_open: fd %d tcgetattr: %m", fd);
return (0);
}
/*
* Set canonical mode and local connection; set specified speed,
* 8 bits and no parity; map CR to NL; ignore break.
*/
ttyp->c_iflag = IGNBRK | IGNPAR | ICRNL;
ttyp->c_oflag = 0;
ttyp->c_cflag = CS8 | CLOCAL | CREAD;
(void)cfsetispeed(&ttyb, (u_int)speed);
(void)cfsetospeed(&ttyb, (u_int)speed);
ttyp->c_lflag = ICANON;
for (i = 0; i < NCCS; ++i)
{
ttyp->c_cc[i] = '\0';
}
/*
* Some special cases
*/
if (flags & LDISC_RAW) {
ttyp->c_iflag = 0;
ttyp->c_lflag = 0;
ttyp->c_cc[VMIN] = 1;
}
#if defined(TIOCMGET) && !defined(SCO5_CLOCK)
/*
* If we have modem control, check to see if modem leads are
* active; if so, set remote connection. This is necessary for
* the kernel pps mods to work.
*/
ltemp = 0;
if (ioctl(fd, TIOCMGET, (char *)<emp) < 0)
msyslog(LOG_ERR,
"refclock_open: fd %d TIOCMGET failed: %m", fd);
#ifdef DEBUG
if (debug)
printf("refclock_open: fd %d modem status 0x%lx\n",
fd, ltemp);
#endif
if (ltemp & TIOCM_DSR)
ttyp->c_cflag &= ~CLOCAL;
#endif /* TIOCMGET */
if (tcsetattr(fd, TCSANOW, ttyp) < 0) {
msyslog(LOG_ERR,
"refclock_open: fd %d TCSANOW failed: %m", fd);
return (0);
}
if (tcflush(fd, TCIOFLUSH) < 0) {
msyslog(LOG_ERR,
"refclock_open: fd %d TCIOFLUSH failed: %m", fd);
return (0);
}
#endif /* HAVE_TERMIOS */
#ifdef HAVE_SYSV_TTYS
/*
* System V serial line parameters (termio interface)
*
*/
if (ioctl(fd, TCGETA, ttyp) < 0) {
msyslog(LOG_ERR,
"refclock_open: fd %d TCGETA failed: %m", fd);
return (0);
}
/*
* Set canonical mode and local connection; set specified speed,
* 8 bits and no parity; map CR to NL; ignore break.
*/
ttyp->c_iflag = IGNBRK | IGNPAR | ICRNL;
ttyp->c_oflag = 0;
ttyp->c_cflag = speed | CS8 | CLOCAL | CREAD;
ttyp->c_lflag = ICANON;
ttyp->c_cc[VERASE] = ttyp->c_cc[VKILL] = '\0';
/*
* Some special cases
*/
if (flags & LDISC_RAW) {
ttyp->c_iflag = 0;
ttyp->c_lflag = 0;
}
#ifdef TIOCMGET
/*
* If we have modem control, check to see if modem leads are
* active; if so, set remote connection. This is necessary for
* the kernel pps mods to work.
*/
ltemp = 0;
if (ioctl(fd, TIOCMGET, (char *)<emp) < 0)
msyslog(LOG_ERR,
"refclock_open: fd %d TIOCMGET failed: %m", fd);
#ifdef DEBUG
if (debug)
printf("refclock_open: fd %d modem status %lx\n",
fd, ltemp);
#endif
if (ltemp & TIOCM_DSR)
ttyp->c_cflag &= ~CLOCAL;
#endif /* TIOCMGET */
if (ioctl(fd, TCSETA, ttyp) < 0) {
msyslog(LOG_ERR,
"refclock_open: fd %d TCSETA failed: %m", fd);
return (0);
}
#endif /* HAVE_SYSV_TTYS */
#ifdef HAVE_BSD_TTYS
/*
* 4.3bsd serial line parameters (sgttyb interface)
*/
if (ioctl(fd, TIOCGETP, (char *)ttyp) < 0) {
msyslog(LOG_ERR,
"refclock_open: fd %d TIOCGETP %m", fd);
return (0);
}
ttyp->sg_ispeed = ttyp->sg_ospeed = speed;
ttyp->sg_flags = EVENP | ODDP | CRMOD;
if (ioctl(fd, TIOCSETP, (char *)ttyp) < 0) {
msyslog(LOG_ERR,
"refclock_open: TIOCSETP failed: %m");
return (0);
}
#endif /* HAVE_BSD_TTYS */
if (!refclock_ioctl(fd, flags)) {
(void)close(fd);
msyslog(LOG_ERR,
"refclock_open: fd %d ioctl failed: %m", fd);
return (0);
}
return (fd);
}
