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MacOSX port: xiopoll() uses Select(), except when too many fds

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This commit is contained in:
Gerhard Rieger 2008-09-29 21:18:58 +02:00
parent 097608e8a9
commit b0d29f8dc7
6 changed files with 75 additions and 29 deletions

50
sysutils.c
View file

@ -413,12 +413,56 @@ const char *hstrerror(int err) {
/* this function behaves like poll(). It tries to do so even when the poll()
system call is not available. */
int xiopoll(struct pollfd fds[], nfds_t nfds, int timeout) {
int xiopoll(struct pollfd fds[], nfds_t nfds, struct timeval *timeout) {
int i, n = 0;
int result = 0;
while (true) { /* should be if (), but we want to break */
fd_set readfds;
fd_set writefds;
fd_set exceptfds;
FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
for (i = 0; i < nfds; ++i) {
fds[i].revents = 0;
if (fds[i].fd < 0) { continue; }
if (fds[i].fd > FD_SETSIZE) { break; /* use poll */ }
if (fds[i].events & POLLIN) {
FD_SET(fds[i].fd, &readfds); n = MAX(n, fds[i].fd); }
if (fds[i].events & POLLOUT) {
FD_SET(fds[i].fd, &writefds); n = MAX(n, fds[i].fd); }
}
if (fds[i].fd > FD_SETSIZE) { break; /* use poll */ }
result = Select(n+1, &readfds, &writefds, &exceptfds, timeout);
if (result < 0) { return result; }
for (i = 0; i < nfds; ++i) {
if (fds[i].fd < 0) { continue; }
if ((fds[i].events & POLLIN) && FD_ISSET(fds[i].fd, &readfds)) {
fds[i].revents |= POLLIN; ++result;
}
if ((fds[i].events & POLLOUT) && FD_ISSET(fds[i].fd, &writefds)) {
fds[i].revents |= POLLOUT; ++result;
}
}
return result;
}
#if HAVE_POLL
return Poll(fds, nfds, timeout);
{
int ms = 0;
if (timeout == NULL) {
ms = -1;
} else {
ms = 1000*timeout->tv_sec + timeout->tv_usec/1000;
}
/*! timeout */
return Poll(fds, nfds, ms);
#else /* HAVE_POLL */
/*!!! wrap around Select() */
} else {
Error("poll() not available");
return -1;
#endif /* !HAVE_POLL */
}
}