Add fd handling with callbacks to select, dbus needs it for async operation.
* src/dbusbind.c: Include process.h. (dbus_fd_cb, xd_find_watch_fd, xd_toggle_watch) (xd_read_message_1): New functions. (xd_add_watch, xd_remove_watch): Call xd_find_watch_fd. Handle watch for both read and write. (Fdbus_init_bus): Also register xd_toggle_watch. (Fdbus_call_method_asynchronously, Fdbus_method_return_internal) (Fdbus_method_error_internal, Fdbus_send_signal): Remove call to dbus_connection_flush. (xd_read_message): Move most of the code to xd_read_message_1. Call xd_read_message_1 until status is COMPLETE. * src/keyboard.c (readable_events, gobble_input): Remove DBUS code. * src/process.c (gpm_wait_mask, max_gpm_desc): Remove. (write_mask): New variable. (max_input_desc): Renamed from max_keyboard_desc. (fd_callback_info): New variable. (add_read_fd, delete_read_fd, add_write_fd, delete_write_fd): New functions. (Fmake_network_process): FD_SET write_mask. (deactivate_process): FD_CLR write_mask. (wait_reading_process_output): Connecting renamed to Writeok. check_connect removed. check_write is new. Remove references to gpm. Use Writeok/check_write unconditionally (i.e. no #ifdef NON_BLOCKING_CONNECT) instead of Connecting. Loop over file descriptors and call callbacks in fd_callback_info if file descriptor is ready for I/O. (add_gpm_wait_descriptor): Just call add_keyboard_wait_descriptor. (delete_gpm_wait_descriptor): Just call delete_keyboard_wait_descriptor. (keyboard_bit_set): Use max_input_desc. (add_keyboard_wait_descriptor, delete_keyboard_wait_descriptor): Remove #ifdef subprocesses. Use max_input_desc. (init_process): Initialize write_mask and fd_callback_info. * src/process.h (add_read_fd, delete_read_fd, add_write_fd) (delete_write_fd): Declare.
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