/*
* 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* good moment to read and dump all available outdated stuff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);
}
