static void plugin_write_cb(struct ev_loop* loop, ev_io* w, int revents V_UNUSED) {
dmn_assert(loop); dmn_assert(w); dmn_assert(revents == EV_WRITE);
dmn_assert(plugin_write_fd > -1);
while(!sendq_empty()) {
const uint32_t data = sendq_deq_peek();
ssize_t write_rv = write(plugin_write_fd, &data, 4);
if(write_rv != 4) {
if(write_rv < 0) {
if(errno == EAGAIN || errno == EWOULDBLOCK)
return; // pipe full, wait for more libev notification of write-ready
else if(errno == EINTR)
continue; // try this write again immediately
else {
ev_break(loop, EVBREAK_ALL);
return;
}
}
else if(write_rv == 0) {
ev_break(loop, EVBREAK_ALL);
return;
}
else {
log_fatal("BUG: atomic pipe write of 4 bytes was not atomic, retval was %zi", write_rv);
}
}
sendq_deq_commit();
}
ev_io_stop(loop, w); // queue now empty
if(killed_by) { // we've sent our final message, close
close(plugin_write_fd);
plugin_write_fd = -1;
}
}
static void plugin_write_cb(struct ev_loop* loop, ev_io* w, int revents V_UNUSED) {
dmn_assert(loop); dmn_assert(w); dmn_assert(revents == EV_WRITE);
while(!sendq_empty()) {
const uint32_t data = sendq_deq_peek();
int rv = write(plugin_write_fd, &data, 4);
if(rv != 4) {
if(rv < 0) {
if(errno == EAGAIN)
return; // pipe full, wait for more libev notification of write-ready
else if(errno == EINTR)
continue; // try this write again immediately
else {
ev_break(loop, EVBREAK_ALL);
return;
}
}
else if(rv == 0) {
ev_break(loop, EVBREAK_ALL);
return;
}
else {
log_fatal("BUG: atomic pipe write of 4 bytes was not atomic, retval was %u", rv);
}
}
sendq_deq_commit();
}
ev_io_stop(loop, w); // queue now empty
}
static void sendq_deq_commit(void) {
dmn_assert(!sendq_empty());
sendq_head++;
sendq_head &= (sendq_alloc - 1);
sendq_len--;
}
static uint32_t sendq_deq_peek(void) {
dmn_assert(!sendq_empty());
return sendq[sendq_head];
}