int poll_loop(struct npool *nsp, int msec_timeout) {
int results_left = 0;
int event_msecs; /* msecs before an event goes off */
int combined_msecs;
int sock_err = 0;
struct poll_engine_info *pinfo = (struct poll_engine_info *)nsp->engine_data;
assert(msec_timeout >= -1);
if (nsp->events_pending == 0)
return 0; /* No need to wait on 0 events ... */
do {
struct nevent *nse;
nsock_log_debug_all(nsp, "wait for events");
nse = next_expirable_event(nsp);
if (!nse)
event_msecs = -1; /* None of the events specified a timeout */
else
event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
/* Force a low timeout when capturing packets on systems where
* the pcap descriptor is not select()able. */
if (gh_list_count(&nsp->pcap_read_events) > 0)
if (event_msecs > PCAP_POLL_INTERVAL)
event_msecs = PCAP_POLL_INTERVAL;
#endif
#endif
/* We cast to unsigned because we want -1 to be very high (since it means no
* timeout) */
combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
/* do non-blocking read on pcap devices that doesn't support select()
* If there is anything read, just leave this loop. */
if (pcap_read_on_nonselect(nsp)) {
/* okay, something was read. */
} else
#endif
#endif
{
results_left = Poll(pinfo->events, pinfo->max_fd + 1, combined_msecs);
if (results_left == -1)
sock_err = socket_errno();
}
gettimeofday(&nsock_tod, NULL); /* Due to poll delay */
} while (results_left == -1 && sock_err == EINTR); /* repeat only if signal occurred */
if (results_left == -1 && sock_err != EINTR) {
nsock_log_error(nsp, "nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
nsp->errnum = sock_err;
return -1;
}
iterate_through_event_lists(nsp);
return 1;
}
int kqueue_loop(mspool *nsp, int msec_timeout) {
int results_left = 0;
int event_msecs; /* msecs before an event goes off */
int combined_msecs;
struct timespec ts, *ts_p;
int sock_err = 0;
struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
assert(msec_timeout >= -1);
if (nsp->events_pending == 0)
return 0; /* No need to wait on 0 events ... */
if (gh_list_count(&nsp->active_iods) > kinfo->evlen) {
kinfo->evlen = gh_list_count(&nsp->active_iods) * 2;
kinfo->events = (struct kevent *)safe_realloc(kinfo->events, kinfo->evlen * sizeof(struct kevent));
}
do {
msevent *nse;
nsock_log_debug_all(nsp, "wait for events");
nse = next_expirable_event(nsp);
if (!nse)
event_msecs = -1; /* None of the events specified a timeout */
else
event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
/* Force a low timeout when capturing packets on systems where
* the pcap descriptor is not select()able. */
if (gh_list_count(&nsp->pcap_read_events) > 0)
if (event_msecs > PCAP_POLL_INTERVAL)
event_msecs = PCAP_POLL_INTERVAL;
#endif
#endif
/* We cast to unsigned because we want -1 to be very high (since it means no
* timeout) */
combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
/* Set up the timeval pointer we will give to kevent() */
memset(&ts, 0, sizeof(struct timespec));
if (combined_msecs >= 0) {
ts.tv_sec = combined_msecs / 1000;
ts.tv_nsec = (combined_msecs % 1000) * 1000000L;
ts_p = &ts;
} else {
ts_p = NULL;
}
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
/* do non-blocking read on pcap devices that doesn't support select()
* If there is anything read, just leave this loop. */
if (pcap_read_on_nonselect(nsp)) {
/* okay, something was read. */
} else
#endif
#endif
{
results_left = kevent(kinfo->kqfd, NULL, 0, kinfo->events, kinfo->evlen, ts_p);
if (results_left == -1)
sock_err = socket_errno();
}
gettimeofday(&nsock_tod, NULL); /* Due to kevent delay */
} while (results_left == -1 && sock_err == EINTR); /* repeat only if signal occurred */
if (results_left == -1 && sock_err != EINTR) {
nsock_log_error(nsp, "nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
nsp->errnum = sock_err;
return -1;
}
iterate_through_event_lists(nsp, results_left);
return 1;
}
int select_loop(struct npool *nsp, int msec_timeout) {
int results_left = 0;
int event_msecs; /* msecs before an event goes off */
int combined_msecs;
int sock_err = 0;
struct timeval select_tv;
struct timeval *select_tv_p;
struct select_engine_info *sinfo = (struct select_engine_info *)nsp->engine_data;
assert(msec_timeout >= -1);
if (nsp->events_pending == 0)
return 0; /* No need to wait on 0 events ... */
do {
struct nevent *nse;
nsock_log_debug_all(nsp, "wait for events");
nse = next_expirable_event(nsp);
if (!nse)
event_msecs = -1; /* None of the events specified a timeout */
else
event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
/* Force a low timeout when capturing packets on systems where
* the pcap descriptor is not select()able. */
if (gh_list_count(&nsp->pcap_read_events))
if (event_msecs > PCAP_POLL_INTERVAL)
event_msecs = PCAP_POLL_INTERVAL;
#endif
#endif
/* We cast to unsigned because we want -1 to be very high (since it means no
* timeout) */
combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
/* Set up the timeval pointer we will give to select() */
memset(&select_tv, 0, sizeof(select_tv));
if (combined_msecs > 0) {
select_tv.tv_sec = combined_msecs / 1000;
select_tv.tv_usec = (combined_msecs % 1000) * 1000;
select_tv_p = &select_tv;
} else if (combined_msecs == 0) {
/* we want the tv_sec and tv_usec to be zero but they already are from bzero */
select_tv_p = &select_tv;
} else {
assert(combined_msecs == -1);
select_tv_p = NULL;
}
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
/* do non-blocking read on pcap devices that doesn't support select()
* If there is anything read, just leave this loop. */
if (pcap_read_on_nonselect(nsp)) {
/* okay, something was read. */
} else
#endif
#endif
{
/* Set up the descriptors for select */
sinfo->fds_results_r = sinfo->fds_master_r;
sinfo->fds_results_w = sinfo->fds_master_w;
sinfo->fds_results_x = sinfo->fds_master_x;
results_left = fselect(sinfo->max_sd + 1, &sinfo->fds_results_r,
&sinfo->fds_results_w, &sinfo->fds_results_x, select_tv_p);
if (results_left == -1)
sock_err = socket_errno();
}
gettimeofday(&nsock_tod, NULL); /* Due to select delay */
} while (results_left == -1 && sock_err == EINTR); /* repeat only if signal occurred */
if (results_left == -1 && sock_err != EINTR) {
nsock_log_error(nsp, "nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
nsp->errnum = sock_err;
return -1;
}
iterate_through_event_lists(nsp);
return 1;
}
