/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2002 Björn Stenberg * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "plugin.h" #include #include #include #include #include "debug.h" #include "i2c.h" #include "lang.h" #include "led.h" #include "keyboard.h" #include "buffer.h" #include "backlight.h" #include "sound_menu.h" #include "mp3data.h" #include "powermgmt.h" #include "splash.h" #include "logf.h" #include "option_select.h" #include "talk.h" #include "version.h" #include "storage.h" #include "pcmbuf.h" #include "errno.h" #include "diacritic.h" #if CONFIG_CHARGING #include "power.h" #endif #ifdef HAVE_LCD_BITMAP #include "scrollbar.h" #include "peakmeter.h" #include "bmp.h" #include "bidi.h" #endif #ifdef USB_ENABLE_HID #include "usbstack/usb_hid.h" #endif #ifdef SIMULATOR #define PREFIX(_x_) sim_ ## _x_ #else #define PREFIX #endif #if defined(HAVE_PLUGIN_CHECK_OPEN_CLOSE) && (MAX_OPEN_FILES>32) #warning "MAX_OPEN_FILES>32, disabling plugin file open/close checking" #undef HAVE_PLUGIN_CHECK_OPEN_CLOSE #endif #ifdef HAVE_PLUGIN_CHECK_OPEN_CLOSE static unsigned int open_files; #endif #ifdef SIMULATOR static unsigned char pluginbuf[PLUGIN_BUFFER_SIZE]; void *sim_plugin_load(char *plugin, void **pd); void sim_plugin_close(void *pd); void sim_lcd_ex_init(unsigned long (*getpixel)(int, int)); void sim_lcd_ex_update_rect(int x, int y, int width, int height); #else #define sim_plugin_close(x) extern unsigned char pluginbuf[]; #include "bitswap.h" #endif /* for actual plugins only, not for codecs */ static bool plugin_loaded = false; static int plugin_size = 0; static bool (*pfn_tsr_exit)(bool reenter) = NULL; /* TSR exit callback */ static char current_plugin[MAX_PATH]; char *plugin_get_current_filename(void); #ifdef HAVE_PLUGIN_CHECK_OPEN_CLOSE /* Some wrappers used to monitor open and close and detect leaks*/ static int open_wrapper(const char* pathname, int flags); static int close_wrapper(int fd); static int creat_wrapper(const char *pathname, mode_t mode); #endif static const struct plugin_api rockbox_api = { /* lcd */ #ifdef HAVE_LCD_CONTRAST lcd_set_contrast, #endif lcd_update, lcd_clear_display, lcd_getstringsize, lcd_putsxy, lcd_puts, lcd_puts_scroll, lcd_stop_scroll, #ifdef HAVE_LCD_CHARCELLS lcd_define_pattern, lcd_get_locked_pattern, lcd_unlock_pattern, lcd_putc, lcd_put_cursor, lcd_remove_cursor, lcd_icon, lcd_double_height, #else &lcd_framebuffer[0][0], lcd_update_rect, lcd_set_drawmode, lcd_get_drawmode, lcd_setfont, lcd_drawpixel, lcd_drawline, lcd_hline, lcd_vline, lcd_drawrect, lcd_fillrect, lcd_mono_bitmap_part, lcd_mono_bitmap, #if LCD_DEPTH > 1 lcd_set_foreground, lcd_get_foreground, lcd_set_background, lcd_get_background, lcd_bitmap_part, lcd_bitmap, lcd_get_backdrop, lcd_set_backdrop, #endif #if LCD_DEPTH == 16 lcd_bitmap_transparent_part, lcd_bitmap_transparent, #if MEMORYSIZE > 2 lcd_blit_yuv, #if defined(TOSHIBA_GIGABEAT_F) || defined(SANSA_E200) || defined(SANSA_C200) \ || defined(IRIVER_H10) || defined(COWON_D2) || defined(PHILIPS_HDD1630) \ || defined(SANSA_FUZE) || defined(SANSA_E200V2) || defined(SANSA_FUZEV2) \ || defined(TOSHIBA_GIGABEAT_S) lcd_yuv_set_options, #endif #endif /* MEMORYSIZE > 2 */ #elif (LCD_DEPTH < 4) && !defined(SIMULATOR) lcd_blit_mono, lcd_blit_grey_phase, #endif /* LCD_DEPTH */ #if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256) lcd_blit_pal256, lcd_pal256_update_pal, #endif lcd_puts_style, lcd_puts_scroll_style, #ifdef HAVE_LCD_INVERT lcd_set_invert_display, #endif /* HAVE_LCD_INVERT */ #if defined(HAVE_LCD_MODES) lcd_set_mode, #endif #if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP) &button_queue, #endif bidi_l2v, font_get_bits, font_load, font_get, font_getstringsize, font_get_width, screen_clear_area, gui_scrollbar_draw, #endif /* HAVE_LCD_BITMAP */ get_codepage_name, backlight_on, backlight_off, backlight_set_timeout, #ifdef HAVE_BACKLIGHT_BRIGHTNESS backlight_set_brightness, #endif /* HAVE_BACKLIGHT_BRIGHTNESS */ #if CONFIG_CHARGING backlight_set_timeout_plugged, #endif is_backlight_on, splash, splashf, #ifdef HAVE_REMOTE_LCD /* remote lcd */ lcd_remote_set_contrast, lcd_remote_clear_display, lcd_remote_puts, lcd_remote_puts_scroll, lcd_remote_stop_scroll, lcd_remote_set_drawmode, lcd_remote_get_drawmode, lcd_remote_setfont, lcd_remote_getstringsize, lcd_remote_drawpixel, lcd_remote_drawline, lcd_remote_hline, lcd_remote_vline, lcd_remote_drawrect, lcd_remote_fillrect, lcd_remote_mono_bitmap_part, lcd_remote_mono_bitmap, lcd_remote_putsxy, lcd_remote_puts_style, lcd_remote_puts_scroll_style, &lcd_remote_framebuffer[0][0], lcd_remote_update, lcd_remote_update_rect, remote_backlight_on, remote_backlight_off, remote_backlight_set_timeout, #if CONFIG_CHARGING remote_backlight_set_timeout_plugged, #endif #endif /* HAVE_REMOTE_LCD */ #if NB_SCREENS == 2 {&screens[SCREEN_MAIN], &screens[SCREEN_REMOTE]}, #else {&screens[SCREEN_MAIN]}, #endif #if defined(HAVE_REMOTE_LCD) && (LCD_REMOTE_DEPTH > 1) lcd_remote_set_foreground, lcd_remote_get_foreground, lcd_remote_set_background, lcd_remote_get_background, lcd_remote_bitmap_part, lcd_remote_bitmap, #endif viewport_set_defaults, #ifdef HAVE_LCD_BITMAP viewportmanager_theme_enable, viewportmanager_theme_undo, #endif /* list */ gui_synclist_init, gui_synclist_set_nb_items, gui_synclist_set_icon_callback, gui_synclist_get_nb_items, gui_synclist_get_sel_pos, gui_synclist_draw, gui_synclist_select_item, gui_synclist_add_item, gui_synclist_del_item, gui_synclist_limit_scroll, gui_synclist_do_button, gui_synclist_set_title, gui_syncyesno_run, simplelist_info_init, simplelist_show_list, /* button */ button_get, button_get_w_tmo, button_status, #ifdef HAVE_BUTTON_DATA button_get_data, button_status_wdata, #endif button_clear_queue, button_queue_count, #ifdef HAS_BUTTON_HOLD button_hold, #endif #ifdef HAVE_TOUCHSCREEN touchscreen_set_mode, #endif #ifdef HAVE_BUTTON_LIGHT buttonlight_set_timeout, buttonlight_off, buttonlight_on, #ifdef HAVE_BUTTONLIGHT_BRIGHTNESS buttonlight_set_brightness, #endif /* HAVE_BUTTONLIGHT_BRIGHTNESS */ #endif /* HAVE_BUTTON_LIGHT */ /* file */ open_utf8, #ifdef HAVE_PLUGIN_CHECK_OPEN_CLOSE (open_func)open_wrapper, close_wrapper, #else (open_func)PREFIX(open), PREFIX(close), #endif (read_func)PREFIX(read), PREFIX(lseek), #ifdef HAVE_PLUGIN_CHECK_OPEN_CLOSE (creat_func)creat_wrapper, #else (creat_func)PREFIX(creat), #endif (write_func)PREFIX(write), PREFIX(remove), PREFIX(rename), PREFIX(ftruncate), PREFIX(filesize), fdprintf, read_line, settings_parseline, storage_sleep, storage_spin, storage_spindown, #if USING_STORAGE_CALLBACK register_storage_idle_func, unregister_storage_idle_func, #endif /* USING_STORAGE_CALLBACK */ reload_directory, create_numbered_filename, file_exists, strip_extension, crc_32, /* dir */ opendir, closedir, readdir, mkdir, rmdir, dir_exists, /* kernel/ system */ #ifdef CPU_ARM __div0, #endif PREFIX(sleep), yield, ¤t_tick, default_event_handler, default_event_handler_ex, create_thread, thread_exit, thread_wait, #if (CONFIG_CODEC == SWCODEC) thread_thaw, #ifdef HAVE_PRIORITY_SCHEDULING thread_set_priority, #endif mutex_init, mutex_lock, mutex_unlock, #endif reset_poweroff_timer, #ifndef SIMULATOR system_memory_guard, &cpu_frequency, #ifdef HAVE_ADJUSTABLE_CPU_FREQ #ifdef CPU_BOOST_LOGGING cpu_boost_, #else cpu_boost, #endif #endif /* HAVE_ADJUSTABLE_CPU_FREQ */ #endif /* !SIMULATOR */ #ifdef HAVE_SCHEDULER_BOOSTCTRL trigger_cpu_boost, cancel_cpu_boost, #endif #if NUM_CORES > 1 cpucache_flush, cpucache_invalidate, #endif timer_register, timer_unregister, timer_set_period, queue_init, queue_delete, queue_post, queue_wait_w_tmo, #if CONFIG_CODEC == SWCODEC queue_enable_queue_send, queue_empty, queue_wait, queue_send, queue_reply, #endif usb_acknowledge, #ifdef USB_ENABLE_HID usb_hid_send, #endif #ifdef RB_PROFILE profile_thread, profstop, __cyg_profile_func_enter, __cyg_profile_func_exit, #endif add_event, remove_event, send_event, #ifdef SIMULATOR /* special simulator hooks */ #if defined(HAVE_LCD_BITMAP) && LCD_DEPTH < 8 sim_lcd_ex_init, sim_lcd_ex_update_rect, #endif #endif /* strings and memory */ snprintf, vsnprintf, strcpy, strlcpy, strlen, strrchr, strcmp, strncmp, strcasecmp, strncasecmp, memset, memcpy, memmove, _ctype_, atoi, strchr, strcat, strlcat, memchr, memcmp, strcasestr, strtok_r, /* unicode stuff */ utf8decode, iso_decode, utf16LEdecode, utf16BEdecode, utf8encode, utf8length, utf8seek, /* sound */ sound_set, sound_default, sound_min, sound_max, sound_unit, sound_val2phys, #ifndef SIMULATOR mp3_play_data, mp3_play_pause, mp3_play_stop, mp3_is_playing, #if CONFIG_CODEC != SWCODEC bitswap, #endif #endif #if CONFIG_CODEC == SWCODEC &audio_master_sampr_list[0], &hw_freq_sampr[0], pcm_apply_settings, pcm_play_data, pcm_play_stop, pcm_set_frequency, pcm_is_playing, pcm_is_paused, pcm_play_pause, pcm_get_bytes_waiting, pcm_calculate_peaks, pcm_get_peak_buffer, pcm_play_lock, pcm_play_unlock, pcmbuf_beep, #ifdef HAVE_RECORDING &rec_freq_sampr[0], pcm_init_recording, pcm_close_recording, pcm_record_data, pcm_record_more, pcm_stop_recording, pcm_calculate_rec_peaks, audio_set_recording_gain, #endif /* HAVE_RECORDING */ #if INPUT_SRC_CAPS != 0 audio_set_output_source, audio_set_input_source, #endif dsp_set_crossfeed, dsp_set_eq, dsp_dither_enable, dsp_configure, dsp_process, dsp_input_count, dsp_output_count, #endif /* CONFIG_CODEC == SWCODEC */ /* playback control */ playlist_amount, playlist_resume, playlist_start, playlist_add, playlist_sync, playlist_remove_all_tracks, playlist_create, playlist_insert_track, playlist_insert_directory, playlist_shuffle, PREFIX(audio_play), audio_stop, audio_pause, audio_resume, audio_next, audio_prev, audio_ff_rewind, audio_next_track, audio_status, audio_current_track, audio_flush_and_reload_tracks, audio_get_file_pos, #if !defined(SIMULATOR) && (CONFIG_CODEC != SWCODEC) mpeg_get_last_header, #endif #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F) || \ (CONFIG_CODEC == SWCODEC) sound_set_pitch, #endif #if !defined(SIMULATOR) && (CONFIG_CODEC != SWCODEC) /* MAS communication */ mas_readmem, mas_writemem, mas_readreg, mas_writereg, #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F) mas_codec_writereg, mas_codec_readreg, i2c_begin, i2c_end, i2c_write, #endif #endif /* !SIMULATOR && CONFIG_CODEC != SWCODEC */ /* menu */ do_menu, /* statusbars */ &statusbars, gui_syncstatusbar_draw, /* options */ get_settings_list, find_setting, option_screen, set_option, set_bool_options, set_int, set_bool, #ifdef HAVE_LCD_COLOR set_color, #endif /* action handling */ get_custom_action, get_action, #ifdef HAVE_TOUCHSCREEN action_get_touchscreen_press, #endif action_userabort, /* power */ battery_level, battery_level_safe, battery_time, #ifndef SIMULATOR battery_voltage, #endif #if CONFIG_CHARGING charger_inserted, # if CONFIG_CHARGING >= CHARGING_MONITOR charging_state, # endif #endif #ifdef HAVE_USB_POWER usb_powered, #endif /* misc */ #if !defined(SIMULATOR) || defined(__MINGW32__) || defined(__CYGWIN__) &errno, #endif srand, rand, (qsort_func)qsort, kbd_input, get_time, set_time, #if CONFIG_RTC mktime, #endif plugin_get_buffer, plugin_get_audio_buffer, plugin_tsr, plugin_get_current_filename, #ifdef PLUGIN_USE_IRAM plugin_iram_init, #endif #if defined(DEBUG) || defined(SIMULATOR) debugf, #endif #ifdef ROCKBOX_HAS_LOGF _logf, #endif &global_settings, &global_status, talk_disable, #if CONFIG_CODEC == SWCODEC codec_thread_do_callback, codec_load_file, get_codec_filename, #endif get_metadata, mp3info, count_mp3_frames, create_xing_header, find_next_frame, #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F) peak_meter_scale_value, peak_meter_set_use_dbfs, peak_meter_get_use_dbfs, #endif #ifdef HAVE_LCD_BITMAP read_bmp_file, read_bmp_fd, #ifdef HAVE_JPEG read_jpeg_file, read_jpeg_fd, #endif screen_dump_set_hook, #endif show_logo, tree_get_context, set_current_file, set_dirfilter, #ifdef HAVE_WHEEL_POSITION wheel_status, wheel_send_events, #endif #ifdef IRIVER_H100_SERIES /* Routines for the iriver_flash -plugin. */ detect_original_firmware, detect_flashed_ramimage, detect_flashed_romimage, #endif led, #if (CONFIG_CODEC == SWCODEC) bufopen, bufalloc, bufclose, bufseek, bufadvance, bufread, bufgetdata, bufgettail, bufcuttail, buf_get_offset, buf_handle_offset, buf_request_buffer_handle, buf_set_base_handle, buf_used, #endif #ifdef HAVE_TAGCACHE tagcache_search, tagcache_search_set_uniqbuf, tagcache_search_add_filter, tagcache_get_next, tagcache_retrieve, tagcache_search_finish, tagcache_get_numeric, #ifdef HAVE_TC_RAMCACHE tagcache_fill_tags, #endif #endif #ifdef HAVE_ALBUMART search_albumart_files, #endif #ifdef HAVE_SEMAPHORE_OBJECTS semaphore_init, semaphore_wait, semaphore_release, #endif appsversion, /* new stuff at the end, sort into place next time the API gets incompatible */ #ifdef HAVE_LCD_BITMAP is_diacritic, #endif }; int plugin_load(const char* plugin, const void* parameter) { int rc, i; struct plugin_header *hdr; #ifdef SIMULATOR void *pd; #else /* !SIMULATOR */ int fd; ssize_t readsize; #if NUM_CORES > 1 unsigned my_core; #endif #endif /* !SIMULATOR */ #if LCD_DEPTH > 1 fb_data* old_backdrop; #endif if (pfn_tsr_exit != NULL) /* if we have a resident old plugin: */ { if (pfn_tsr_exit(!strcmp(current_plugin, plugin)) == false ) { /* not allowing another plugin to load */ return PLUGIN_OK; } pfn_tsr_exit = NULL; plugin_loaded = false; } splash(0, ID2P(LANG_WAIT)); strcpy(current_plugin, plugin); #ifdef SIMULATOR hdr = sim_plugin_load((char *)plugin, &pd); if (pd == NULL) { splashf(HZ*2, str(LANG_PLUGIN_CANT_OPEN), plugin); return -1; } if (hdr == NULL || hdr->magic != PLUGIN_MAGIC || hdr->target_id != TARGET_ID) { sim_plugin_close(pd); splash(HZ*2, str(LANG_PLUGIN_WRONG_MODEL)); return -1; } if (hdr->api_version > PLUGIN_API_VERSION || hdr->api_version < PLUGIN_MIN_API_VERSION) { sim_plugin_close(pd); splash(HZ*2, str(LANG_PLUGIN_WRONG_VERSION)); return -1; } #else fd = open(plugin, O_RDONLY); if (fd < 0) { splashf(HZ*2, str(LANG_PLUGIN_CANT_OPEN), plugin); return fd; } #if NUM_CORES > 1 /* Make sure COP cache is flushed and invalidated before loading */ my_core = switch_core(CURRENT_CORE ^ 1); cpucache_invalidate(); switch_core(my_core); #endif readsize = read(fd, pluginbuf, PLUGIN_BUFFER_SIZE); close(fd); if (readsize < 0) { splashf(HZ*2, str(LANG_READ_FAILED), plugin); return -1; } hdr = (struct plugin_header *)pluginbuf; if ((unsigned)readsize <= sizeof(struct plugin_header) || hdr->magic != PLUGIN_MAGIC || hdr->target_id != TARGET_ID || hdr->load_addr != pluginbuf || hdr->end_addr > pluginbuf + PLUGIN_BUFFER_SIZE) { splash(HZ*2, str(LANG_PLUGIN_WRONG_MODEL)); return -1; } if (hdr->api_version > PLUGIN_API_VERSION || hdr->api_version < PLUGIN_MIN_API_VERSION) { splash(HZ*2, str(LANG_PLUGIN_WRONG_VERSION)); return -1; } plugin_size = hdr->end_addr - pluginbuf; /* zero out bss area only, above guards end of pluginbuf */ if (plugin_size > readsize) memset(pluginbuf + readsize, 0, plugin_size - readsize); #endif *(hdr->api) = &rockbox_api; plugin_loaded = true; #if defined HAVE_LCD_BITMAP && LCD_DEPTH > 1 old_backdrop = lcd_get_backdrop(); #endif lcd_clear_display(); lcd_update(); #ifdef HAVE_REMOTE_LCD lcd_remote_clear_display(); lcd_remote_update(); #endif FOR_NB_SCREENS(i) viewportmanager_theme_enable(i, false, NULL); cpucache_invalidate(); #ifdef HAVE_TOUCHSCREEN touchscreen_set_mode(TOUCHSCREEN_BUTTON); #endif #ifdef HAVE_PLUGIN_CHECK_OPEN_CLOSE open_files = 0; #endif rc = hdr->entry_point(parameter); /* Go back to the global setting in case the plugin changed it */ #ifdef HAVE_TOUCHSCREEN touchscreen_set_mode(global_settings.touch_mode); #endif button_clear_queue(); #ifdef HAVE_LCD_BITMAP lcd_setfont(FONT_UI); #if LCD_DEPTH > 1 lcd_set_backdrop(old_backdrop); #ifdef HAVE_LCD_COLOR lcd_set_drawinfo(DRMODE_SOLID, global_settings.fg_color, global_settings.bg_color); #else lcd_set_drawinfo(DRMODE_SOLID, LCD_DEFAULT_FG, LCD_DEFAULT_BG); #endif #else /* LCD_DEPTH == 1 */ lcd_set_drawmode(DRMODE_SOLID); #endif /* LCD_DEPTH */ #endif /* HAVE_LCD_BITMAP */ #ifdef HAVE_REMOTE_LCD #if LCD_REMOTE_DEPTH > 1 lcd_remote_set_drawinfo(DRMODE_SOLID, LCD_REMOTE_DEFAULT_FG, LCD_REMOTE_DEFAULT_BG); #else lcd_remote_set_drawmode(DRMODE_SOLID); #endif #endif lcd_clear_display(); #ifdef HAVE_LCD_REMOTE lcd_remote_clear_display(); #endif FOR_NB_SCREENS(i) viewportmanager_theme_undo(i, false); if (pfn_tsr_exit == NULL) plugin_loaded = false; #ifdef HAVE_PLUGIN_CHECK_OPEN_CLOSE if(open_files != 0 && !plugin_loaded) { int fd; logf("Plugin '%s' leaks file handles", plugin); static const char *lines[] = { ID2P(LANG_PLUGIN_ERROR), "#leak-file-handles" }; static const struct text_message message={ lines, 2 }; button_clear_queue(); /* Empty the keyboard buffer */ gui_syncyesno_run(&message, NULL, NULL); for(fd=0; fd < MAX_OPEN_FILES; fd++) if(open_files & (1<= PLUGIN_BUFFER_SIZE) return NULL; *buffer_size = PLUGIN_BUFFER_SIZE-plugin_size; buffer_pos = plugin_size; } else { *buffer_size = PLUGIN_BUFFER_SIZE; buffer_pos = 0; } return &pluginbuf[buffer_pos]; } /* Returns a pointer to the mp3 buffer. Playback gets stopped, to avoid conflicts. Talk buffer is stolen as well. */ void* plugin_get_audio_buffer(size_t *buffer_size) { #if CONFIG_CODEC == SWCODEC return audio_get_buffer(true, buffer_size); #else audio_stop(); talk_buffer_steal(); /* we use the mp3 buffer, need to tell */ *buffer_size = audiobufend - audiobuf; return audiobuf; #endif } #ifdef PLUGIN_USE_IRAM /* Initializes plugin IRAM */ void plugin_iram_init(char *iramstart, char *iramcopy, size_t iram_size, char *iedata, size_t iedata_size) { /* We need to stop audio playback in order to use codec IRAM */ audio_hard_stop(); memcpy(iramstart, iramcopy, iram_size); memset(iedata, 0, iedata_size); memset(iramcopy, 0, iram_size); #if NUM_CORES > 1 /* writeback cleared iedata and iramcopy areas */ cpucache_flush(); #endif } #endif /* PLUGIN_USE_IRAM */ /* The plugin wants to stay resident after leaving its main function, e.g. runs from timer or own thread. The callback is registered to later instruct it to free its resources before a new plugin gets loaded. */ void plugin_tsr(bool (*exit_callback)(bool)) { pfn_tsr_exit = exit_callback; /* remember the callback for later */ } char *plugin_get_current_filename(void) { return current_plugin; } #ifdef HAVE_PLUGIN_CHECK_OPEN_CLOSE static int open_wrapper(const char* pathname, int flags) { int fd = PREFIX(open)(pathname,flags); if(fd >= 0) open_files |= 1<= 0) open_files &= (~(1<= 0) open_files |= (1<