/*
* Wait for file or timer events and handle them. This function returns 1 if there are no files or
* timers to wait for, -1 if some error occurred, or 0 if any number of events was successfully
* handled.
*/
int disHandleEvents(Dispatcher *dis)
{
int nfds, r;
fd_set rfds, wfds;
struct timeval *tv;
P dbgPrint(stderr, "Calling disPrepareSelect.\n");
r = disPrepareSelect(dis, &nfds, &rfds, &wfds, &tv);
P dbgPrint(stderr, "disPrepareSelect returned:\n\tr: %d\n\tnfds: %d\n", r, nfds);
if (r < 0) {
/* Fake a timeout. */
disProcessSelect(dis, 0, 0, NULL, NULL);
return 0;
}
else if (nfds > 0) {
P dumpfds(stderr, "\trfds:", nfds, &rfds);
P dumpfds(stderr, "\twfds:", nfds, &wfds);
}
P {
if (tv == NULL) {
fprintf(stderr, "\ttv: NULL\n");
}
else {
fprintf(stderr, "\ttv: %ld.%06ld\n", tv->tv_sec, tv->tv_usec);
}
}
if (nfds == 0 && tv == NULL) {
P dbgPrint(stderr, "No more files, no more timeouts: return 1.\n");
return 1;
}
P dbgPrint(stderr, "Calling select.\n");
r = select(nfds, &rfds, &wfds, NULL, tv);
P dbgPrint(stderr, "select returned %d\n", r);
if (r < 0) {
return r;
}
else if (r > 0) {
P dumpfds(stderr, "\trfds:", nfds, &rfds);
P dumpfds(stderr, "\twfds:", nfds, &wfds);
}
P dbgPrint(stderr, "Calling disProcessSelect.\n");
disProcessSelect(dis, r, nfds, &rfds, &wfds);
return 0;
}
/*
* Prepare a call to select() based on the files and timeouts set in <ns>. The necessary parameters
* to select() are returned through <nfds>, <rfds>, <wfds> and <tv> (exception-fds should be set to
* NULL). <*tv> is set to point to an appropriate timeout value, or NULL if no timeout is to be set.
* This function will clear <rfds> and <wfds>, so if callers want to add their own file descriptors,
* they should do so after calling this function. This function returns -1 if the first timeout
* should already have occurred, otherwise 0.
*/
int nsPrepareSelect(NS *ns, int *nfds, fd_set *rfds, fd_set *wfds, struct timeval **tv)
{
return disPrepareSelect(&ns->dis, nfds, rfds, wfds, tv);
}
