static void poll_fd_events_update_watches(PollEvents *s, GIOCondition cond) { PollFdEvents *self = (PollFdEvents *) s; if (cond & G_IO_IN) iv_fd_set_handler_in(&self->fd_watch, IV_FD_CALLBACK(poll_events_invoke_callback)); else iv_fd_set_handler_in(&self->fd_watch, NULL); if (cond & G_IO_OUT) iv_fd_set_handler_out(&self->fd_watch, IV_FD_CALLBACK(poll_events_invoke_callback)); else iv_fd_set_handler_out(&self->fd_watch, NULL); if (cond & (G_IO_IN + G_IO_OUT)) iv_fd_set_handler_err(&self->fd_watch, IV_FD_CALLBACK(poll_events_invoke_callback)); else iv_fd_set_handler_err(&self->fd_watch, NULL); }
static void log_writer_update_fd_callbacks(LogWriter *self, GIOCondition cond) { main_loop_assert_main_thread(); if (self->pollable_state > 0) { if (self->flags & LW_DETECT_EOF && (cond & G_IO_IN) == 0 && (cond & G_IO_OUT)) { /* if output is enabled, and we're in DETECT_EOF mode, and input is * not needed by the log protocol, install the eof check callback to * destroy the connection if an EOF is received. */ iv_fd_set_handler_in(&self->fd_watch, log_writer_io_check_eof); } else if (cond & G_IO_IN) { /* in case the protocol requested G_IO_IN, it means that it needs to * invoke read in the flush code, so just install the flush_output * handler for input */ iv_fd_set_handler_in(&self->fd_watch, log_writer_io_flush_output); } else { /* otherwise we're not interested in input */ iv_fd_set_handler_in(&self->fd_watch, NULL); } if (cond & G_IO_OUT) iv_fd_set_handler_out(&self->fd_watch, log_writer_io_flush_output); else iv_fd_set_handler_out(&self->fd_watch, NULL); iv_fd_set_handler_err(&self->fd_watch, log_writer_io_error); } else { /* fd is not pollable, assume it is always writable */ if (cond & G_IO_OUT) { if (!iv_task_registered(&self->immed_io_task)) iv_task_register(&self->immed_io_task); } else if (iv_task_registered(&self->immed_io_task)) { iv_task_unregister(&self->immed_io_task); } } }
static void log_reader_update_watches(LogReader *self) { gint fd; GIOCondition cond; gboolean free_to_send; main_loop_assert_main_thread(); self->suspended = FALSE; free_to_send = log_source_free_to_send(&self->super); if (!free_to_send || self->immediate_check || log_proto_prepare(self->proto, &fd, &cond)) { /* we disable all I/O related callbacks here because we either know * that we can continue (e.g. immediate_check == TRUE) or we know * that we can't continue even if data would be available (e.g. * free_to_send == FALSE) */ self->immediate_check = FALSE; if (iv_fd_registered(&self->fd_watch)) { iv_fd_set_handler_in(&self->fd_watch, NULL); iv_fd_set_handler_out(&self->fd_watch, NULL); /* we disable the error handler too, as it might be * triggered even when we don't want to read data * (e.g. log_source_free_to_send() is FALSE). * * And at least on Linux, it may happen that EPOLLERR is * set, while there's still data in the socket buffer. Thus * in reaction to an EPOLLERR, we could possibly send * further messages without validating the * log_source_free_to_send() would allow us to, potentially * overflowing our window (and causing a failed assertion in * log_source_queue(). */ iv_fd_set_handler_err(&self->fd_watch, NULL); } if (iv_timer_registered(&self->follow_timer)) iv_timer_unregister(&self->follow_timer); if (free_to_send) { /* we have data in our input buffer, we need to start working * on it immediately, without waiting for I/O events */ if (!iv_task_registered(&self->restart_task)) { iv_task_register(&self->restart_task); } } else { self->suspended = TRUE; } return; } if (iv_fd_registered(&self->fd_watch)) { /* this branch is executed when our fd is connected to a non-file * source (e.g. TCP, UDP socket). We set up I/O callbacks here. * files cannot be polled using epoll, as it causes an I/O error * (thus abort in ivykis). */ if (cond & G_IO_IN) iv_fd_set_handler_in(&self->fd_watch, log_reader_io_process_input); else iv_fd_set_handler_in(&self->fd_watch, NULL); if (cond & G_IO_OUT) iv_fd_set_handler_out(&self->fd_watch, log_reader_io_process_input); else iv_fd_set_handler_out(&self->fd_watch, NULL); if (cond & (G_IO_IN + G_IO_OUT)) iv_fd_set_handler_err(&self->fd_watch, log_reader_io_process_input); else iv_fd_set_handler_err(&self->fd_watch, NULL); } else { if (self->options->follow_freq > 0) { if (iv_timer_registered(&self->follow_timer)) iv_timer_unregister(&self->follow_timer); iv_validate_now(); self->follow_timer.expires = iv_now; timespec_add_msec(&self->follow_timer.expires, self->options->follow_freq); iv_timer_register(&self->follow_timer); } else { /* NOTE: we don't need to unregister the timer here as follow_freq * never changes during runtime, thus if ever it was registered that * also means that we go into the if branch above. */ } } }