void process_debt(int fd) {
/* After a short write, we finally can deliver the "debt" */
ssize_t ret;
dpf("Selecting %d for writing because of debt %d\n", fd, fdinfo[fd].debt);
send_was_interrupted2:
ret = send(fd, fdinfo[fd].buff, fdinfo[fd].debt, 0);
dpf(" sent %d bytes\n", ret);
if (ret == 0) {
fprintf(stderr, "send returned 0? Submit to codinghorror?\n");
close_fd(fd);
return;
} else
if (ret < 0) {
if(errno==EINTR) goto send_was_interrupted2;
if(errno==EAGAIN) {
fdinfo[fd].writeready=0;
fdinfo[fd].we_should_epoll_for_writes=1;
epoll_update(fd);
} else {
fprintf(stderr, "Why epoll hasn't told us that there would be error at sending?\n");
perror("send");
close_fd(fd);
return;
}
} else {
if (ret < fdinfo[fd].debt) {
dpf(" short write at %d\n", fd);
/* _Again_ short write. Need to remember the rest of the buffer somewhere. */
int l = fdinfo[fd].debt - ret;
char* b = (char*)malloc(l);
if (b == NULL) {
perror("malloc");
close_fd(fd);
return;
}
memcpy(b, fdinfo[fd].buff + ret, l);
free(fdinfo[fd].buff);
fdinfo[fd].buff = b;
fdinfo[fd].debt = l;
fdinfo[fd].we_should_epoll_for_writes=1;
epoll_update(fd);
dpf(" re-stored debt %d for %d\n", l, fd);
} else {
/* Now the debt is fulfilled */
free(fdinfo[fd].buff);
fdinfo[fd].buff = NULL;
fdinfo[fd].debt = 0;
dpf(" debt is fulfilled for %d\n", fd);
/* and we can start a new cycle */
fdinfo[fdinfo[fd].peerfd].we_should_epoll_for_reads = 1;
epoll_update(fdinfo[fd].peerfd);
}
}
}
int
evfilt_socket_knote_create(struct filter *filt, struct knote *kn)
{
struct epoll_event ev;
if (linux_get_descriptor_type(kn) < 0)
return (-1);
/* TODO: return EBADF? */
if (kn->kn_flags & KNFL_REGULAR_FILE)
return (-1);
/* Convert the kevent into an epoll_event */
kn->data.events = EPOLLOUT;
if (kn->kev.flags & EV_ONESHOT || kn->kev.flags & EV_DISPATCH)
kn->data.events |= EPOLLONESHOT;
if (kn->kev.flags & EV_CLEAR)
kn->data.events |= EPOLLET;
memset(&ev, 0, sizeof(ev));
ev.events = kn->data.events;
ev.data.ptr = kn;
return epoll_update(EPOLL_CTL_ADD, filt, kn, &ev);
}
int
evfilt_read_knote_delete(struct filter *filt, struct knote *kn)
{
if (kn->kev.flags & EV_DISABLE)
return (0);
if (
(
kn->kn_flags & KNFL_REGULAR_FILE
&& kn->kdata.kn_eventfd != -1
) == true
) {
if (epoll_ctl(kn->kn_epollfd, EPOLL_CTL_DEL, kn->kdata.kn_eventfd, NULL) < 0) {
dbg_perror("epoll_ctl(2)");
return (-1);
}
(void) close(kn->kdata.kn_eventfd);
kn->kdata.kn_eventfd = -1;
} else {
return epoll_update(EPOLL_CTL_DEL, filt, kn, NULL);
}
// clang will complain about not returning a value otherwise
return (-1);
}
int
evfilt_socket_knote_delete(struct filter *filt, struct knote *kn)
{
if (kn->kev.flags & EV_DISABLE)
return (0);
else
return epoll_update(EPOLL_CTL_DEL, filt, kn, NULL);
}
int
evfilt_socket_knote_enable(struct filter *filt, struct knote *kn)
{
struct epoll_event ev;
memset(&ev, 0, sizeof(ev));
ev.events = kn->data.events;
ev.data.ptr = kn;
return epoll_update(EPOLL_CTL_ADD, filt, kn, &ev);
}
int
evfilt_read_knote_create(struct filter *filt, struct knote *kn)
{
struct epoll_event ev;
if (linux_get_descriptor_type(kn) < 0)
return (-1);
/* Convert the kevent into an epoll_event */
#if defined(HAVE_EPOLLRDHUP)
kn->data.events = EPOLLIN | EPOLLRDHUP;
#else
kn->data.events = EPOLLIN;
#endif
if (kn->kev.flags & EV_ONESHOT || kn->kev.flags & EV_DISPATCH)
kn->data.events |= EPOLLONESHOT;
if (kn->kev.flags & EV_CLEAR)
kn->data.events |= EPOLLET;
memset(&ev, 0, sizeof(ev));
ev.events = kn->data.events;
ev.data.ptr = kn;
/* Special case: for regular files, add a surrogate eventfd that is always readable */
if (kn->kn_flags & KNFL_FILE) {
int evfd;
kn->kn_epollfd = filter_epfd(filt);
evfd = eventfd(0, 0);
if (evfd < 0) {
dbg_perror("eventfd(2)");
return (-1);
}
if (eventfd_write(evfd, 1) < 0) {
dbg_perror("eventfd_write(3)");
(void) close(evfd);
return (-1);
}
kn->kdata.kn_eventfd = evfd;
if (epoll_ctl(kn->kn_epollfd, EPOLL_CTL_ADD, kn->kdata.kn_eventfd, &ev) < 0) {
dbg_printf("epoll_ctl(2): %s", strerror(errno));
return (-1);
}
kn->kn_registered = 1;
return (0);
}
return epoll_update(EPOLL_CTL_ADD, filt, kn, &ev);
}
int
evfilt_read_knote_disable(struct filter *filt, struct knote *kn)
{
if (kn->kn_flags & KNFL_REGULAR_FILE) {
if (epoll_ctl(kn->kn_epollfd, EPOLL_CTL_DEL, kn->kdata.kn_eventfd, NULL) < 0) {
dbg_perror("epoll_ctl(2)");
return (-1);
}
return (0);
} else {
return epoll_update(EPOLL_CTL_DEL, filt, kn, NULL);
}
}
int
evfilt_read_knote_enable(struct filter *filt, struct knote *kn)
{
struct epoll_event ev;
memset(&ev, 0, sizeof(ev));
ev.events = kn->data.events;
ev.data.ptr = kn;
if (kn->kn_flags & KNFL_REGULAR_FILE) {
if (epoll_ctl(kn->kn_epollfd, EPOLL_CTL_ADD, kn->kdata.kn_eventfd, &ev) < 0) {
dbg_perror("epoll_ctl(2)");
return (-1);
}
return (0);
} else {
return epoll_update(EPOLL_CTL_ADD, filt, kn, &ev);
}
// clang will complain about not returning a value otherwise
return (-1);
}
int
evfilt_socket_knote_disable(struct filter *filt, struct knote *kn)
{
return epoll_update(EPOLL_CTL_DEL, filt, kn, NULL);
}