void (*sp_debug_handler)(const char *format, ...) = sp_default_debug_handler;
-static void get_time(struct timeval *time);
-
static enum sp_return get_config(struct sp_port *port, struct port_data *data,
struct sp_port_config *config);
static enum sp_return set_config(struct sp_port *port, struct port_data *data,
const struct sp_port_config *config);
-static void get_time(struct timeval *time)
+#ifndef _WIN32
+
+/* Timing abstraction */
+
+struct time {
+ struct timeval tv;
+};
+
+struct timeout {
+ unsigned int ms;
+ struct time start, delta, now, end;
+ struct timeval delta_tv;
+ bool overflow;
+};
+
+#define TIME_ZERO {.tv = {0, 0}}
+#define TIME_MS(ms) {.tv = {ms / 1000, (ms % 1000) * 1000}}
+
+const struct time max_delta = TIME_MS(INT_MAX);
+
+static void time_get(struct time *time)
{
#ifdef HAVE_CLOCK_GETTIME
struct timespec ts;
- clock_gettime(CLOCK_MONOTONIC, &ts);
- time->tv_sec = ts.tv_sec;
- time->tv_usec = ts.tv_nsec / 1000;
+ if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
+ clock_gettime(CLOCK_REALTIME, &ts);
+ time->tv.tv_sec = ts.tv_sec;
+ time->tv.tv_usec = ts.tv_nsec / 1000;
#elif defined(__APPLE__)
mach_timebase_info_data_t info;
mach_timebase_info(&info);
uint64_t ticks = mach_absolute_time();
uint64_t ns = (ticks * info.numer) / info.denom;
- time->tv_sec = ns / 1000000000;
- time->tv_usec = (ns % 1000000000) / 1000;
+ time->tv.tv_sec = ns / 1000000000;
+ time->tv.tv_usec = (ns % 1000000000) / 1000;
#else
- gettimeofday(time, NULL);
+ gettimeofday(&time->tv, NULL);
#endif
}
+static void time_set_ms(struct time *time, unsigned int ms)
+{
+ time->tv.tv_sec = ms / 1000;
+ time->tv.tv_usec = (ms % 1000) * 1000;
+}
+
+static void time_add(const struct time *a,
+ const struct time *b, struct time *result)
+{
+ timeradd(&a->tv, &b->tv, &result->tv);
+}
+
+static void time_sub(const struct time *a,
+ const struct time *b, struct time *result)
+{
+ timersub(&a->tv, &b->tv, &result->tv);
+}
+
+static bool time_greater(const struct time *a, const struct time *b)
+{
+ return timercmp(&a->tv, &b->tv, >);
+}
+
+static void time_as_timeval(const struct time *time, struct timeval *tv)
+{
+ *tv = time->tv;
+}
+
+static unsigned int time_as_ms(const struct time *time)
+{
+ return time->tv.tv_sec * 1000 + time->tv.tv_usec / 1000;
+}
+
+static void timeout_start(struct timeout *timeout, unsigned int timeout_ms)
+{
+ timeout->ms = timeout_ms;
+
+ timeout->overflow = (timeout->ms > INT_MAX);
+
+ /* Get time at start of operation. */
+ time_get(&timeout->start);
+ /* Define duration of timeout. */
+ time_set_ms(&timeout->delta, timeout_ms);
+ /* Calculate time at which we should give up. */
+ time_add(&timeout->start, &timeout->delta, &timeout->end);
+}
+
+static bool timeout_check(struct timeout *timeout)
+{
+ if (timeout->ms == 0)
+ return false;
+
+ time_get(&timeout->now);
+ time_sub(&timeout->end, &timeout->now, &timeout->delta);
+ if ((timeout->overflow = time_greater(&timeout->delta, &max_delta)))
+ timeout->delta = max_delta;
+
+ return time_greater(&timeout->now, &timeout->end);
+}
+
+static struct timeval *timeout_timeval(struct timeout *timeout)
+{
+ if (timeout->ms == 0)
+ return NULL;
+
+ time_as_timeval(&timeout->delta, &timeout->delta_tv);
+
+ return &timeout->delta_tv;
+}
+
+static unsigned int timeout_remaining_ms(struct timeout *timeout)
+{
+ if (timeout->ms == 0)
+ return -1;
+ else if (timeout->overflow)
+ return INT_MAX;
+ else
+ return time_as_ms(&timeout->delta);
+}
+
+#endif
+
SP_API enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr)
{
struct sp_port *port;
RETURN_CODEVAL(ret);
}
#else
- int flags_local = O_NONBLOCK | O_NOCTTY;
+ int flags_local = O_NONBLOCK | O_NOCTTY | O_CLOEXEC;
/* Map 'flags' to the OS-specific settings. */
if ((flags & SP_MODE_READ_WRITE) == SP_MODE_READ_WRITE)
#else
int result;
while (1) {
-#ifdef __ANDROID__
+#if defined(__ANDROID__) && (__ANDROID_API__ < 21)
+ /* Android only has tcdrain from platform 21 onwards.
+ * On previous API versions, use the ioctl directly. */
int arg = 1;
result = ioctl(port->fd, TCSBRK, &arg);
#else
#else
size_t bytes_written = 0;
unsigned char *ptr = (unsigned char *) buf;
- struct timeval start, delta, now, end = {0, 0};
+ struct timeout timeout;
int started = 0;
fd_set fds;
int result;
- if (timeout_ms) {
- /* Get time at start of operation. */
- get_time(&start);
- /* Define duration of timeout. */
- delta.tv_sec = timeout_ms / 1000;
- delta.tv_usec = (timeout_ms % 1000) * 1000;
- /* Calculate time at which we should give up. */
- timeradd(&start, &delta, &end);
- }
+ timeout_start(&timeout, timeout_ms);
FD_ZERO(&fds);
FD_SET(port->fd, &fds);
* to avoid any issues if a short timeout is reached before
* select() is even run.
*/
- if (timeout_ms && started) {
- get_time(&now);
- if (timercmp(&now, &end, >))
- /* Timeout has expired. */
- break;
- timersub(&end, &now, &delta);
- }
- result = select(port->fd + 1, NULL, &fds, NULL, timeout_ms ? &delta : NULL);
+ if (started && timeout_check(&timeout))
+ break;
+
+ result = select(port->fd + 1, NULL, &fds, NULL, timeout_timeval(&timeout));
started = 1;
if (result < 0) {
if (errno == EINTR) {
#else
size_t bytes_read = 0;
- unsigned char *ptr = (unsigned char *)buf;
- struct timeval start, delta, now, end = {0, 0};
+ unsigned char *ptr = (unsigned char *) buf;
+ struct timeout timeout;
int started = 0;
fd_set fds;
int result;
- if (timeout_ms) {
- /* Get time at start of operation. */
- get_time(&start);
- /* Define duration of timeout. */
- delta.tv_sec = timeout_ms / 1000;
- delta.tv_usec = (timeout_ms % 1000) * 1000;
- /* Calculate time at which we should give up. */
- timeradd(&start, &delta, &end);
- }
+ timeout_start(&timeout, timeout_ms);
FD_ZERO(&fds);
FD_SET(port->fd, &fds);
* to avoid any issues if a short timeout is reached before
* select() is even run.
*/
- if (timeout_ms && started) {
- get_time(&now);
- if (timercmp(&now, &end, >))
- /* Timeout has expired. */
- break;
- timersub(&end, &now, &delta);
- }
- result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
+ if (started && timeout_check(&timeout))
+ /* Timeout has expired. */
+ break;
+
+ result = select(port->fd + 1, &fds, NULL, NULL, timeout_timeval(&timeout));
started = 1;
if (result < 0) {
if (errno == EINTR) {
#else
size_t bytes_read = 0;
- struct timeval start, delta, now, end = {0, 0};
+ struct timeout timeout;
int started = 0;
fd_set fds;
int result;
- if (timeout_ms) {
- /* Get time at start of operation. */
- get_time(&start);
- /* Define duration of timeout. */
- delta.tv_sec = timeout_ms / 1000;
- delta.tv_usec = (timeout_ms % 1000) * 1000;
- /* Calculate time at which we should give up. */
- timeradd(&start, &delta, &end);
- }
+ timeout_start(&timeout, timeout_ms);
FD_ZERO(&fds);
FD_SET(port->fd, &fds);
* to avoid any issues if a short timeout is reached before
* select() is even run.
*/
- if (timeout_ms && started) {
- get_time(&now);
- if (timercmp(&now, &end, >))
- /* Timeout has expired. */
- break;
- timersub(&end, &now, &delta);
- }
- result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
+ if (started && timeout_check(&timeout))
+ /* Timeout has expired. */
+ break;
+
+ result = select(port->fd + 1, &fds, NULL, NULL, timeout_timeval(&timeout));
started = 1;
if (result < 0) {
if (errno == EINTR) {
RETURN_OK();
#else
- struct timeval start, delta, now, end = {0, 0};
- const struct timeval max_delta = {
- (INT_MAX / 1000), (INT_MAX % 1000) * 1000
- };
- int started = 0, timeout_overflow = 0;
- int result, timeout_remaining_ms;
+ struct timeout timeout;
+ int started = 0, result;
struct pollfd *pollfds;
unsigned int i;
pollfds[i].events |= POLLERR;
}
- if (timeout_ms) {
- /* Get time at start of operation. */
- get_time(&start);
- /* Define duration of timeout. */
- delta.tv_sec = timeout_ms / 1000;
- delta.tv_usec = (timeout_ms % 1000) * 1000;
- /* Calculate time at which we should give up. */
- timeradd(&start, &delta, &end);
- }
+ timeout_start(&timeout, timeout_ms);
/* Loop until an event occurs. */
while (1) {
* to avoid any issues if a short timeout is reached before
* poll() is even run.
*/
- if (!timeout_ms) {
- timeout_remaining_ms = -1;
- } else if (!started) {
- timeout_overflow = (timeout_ms > INT_MAX);
- timeout_remaining_ms = timeout_overflow ? INT_MAX : timeout_ms;
- } else {
- get_time(&now);
- if (timercmp(&now, &end, >)) {
- DEBUG("Wait timed out");
- break;
- }
- timersub(&end, &now, &delta);
- if ((timeout_overflow = timercmp(&delta, &max_delta, >)))
- delta = max_delta;
- timeout_remaining_ms = delta.tv_sec * 1000 + delta.tv_usec / 1000;
+ if (started && timeout_check(&timeout)) {
+ DEBUG("Wait timed out");
+ break;
}
- result = poll(pollfds, event_set->count, timeout_remaining_ms);
+ result = poll(pollfds, event_set->count, timeout_remaining_ms(&timeout));
started = 1;
if (result < 0) {
}
} else if (result == 0) {
DEBUG("poll() timed out");
- if (!timeout_overflow)
+ if (!timeout.overflow)
break;
} else {
DEBUG("poll() completed");