Improve memory mapping.

[paraslash.git] / afs.h

diff --git a/afs.h b/afs.h
index ba8964c7e6128a768a2408c8f8a7e90983c440d1..ecec685c06a8187f4116037c41ea6eacd668009d 100644 (file)
--- a/afs.h
+++ b/afs.h
@@ -1,114 +1,208 @@
+/*
+ * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file afs.h Exported symbols of the audio file selector. */
+

 #include <regex.h>
 #include "osl.h"
 #include "hash.h"
 
 #include <regex.h>
 #include "osl.h"
 #include "hash.h"
 

+/** Audio file selector data stored in the audio file table. */

 struct afs_info {
 struct afs_info {

+       /** Seconds since the epoch. */

        uint64_t last_played;
        uint64_t last_played;

+       /** Bit field of set attributes. */

        uint64_t attributes;
        uint64_t attributes;

+       /** Counts how many times the file was selected. */

        uint32_t num_played;
        uint32_t num_played;

+       /** Image blob associated with this file (foreign key). */

        uint32_t image_id;
        uint32_t image_id;

+       /** Lyrics blob associated with this file (foreign key). */

        uint32_t lyrics_id;
        uint32_t lyrics_id;

+       /** Mp3, ogg or aac. */

        uint8_t audio_format_id;
        uint8_t audio_format_id;

+       /** Amplification value. */
+       uint8_t amp;

 };
 
 };
 

-enum afs_table_flags {TBLFLAG_SKIP_CREATE};
-
-struct table_info {
-       const struct osl_table_description *desc;
-       struct osl_table *table;
-       enum afs_table_flags flags;
+/**
+ * Events caused by changes to an afs table.
+ *
+ * Whenever an afs table changes, an event is generated which causes afs to
+ * call the event handlers of all other tables. For example, if an audio file
+ * is added, the event handler of the mood table checks the new file for
+ * admissibility.
+ */
+enum afs_events {
+       /** An attribute was added. */
+       ATTRIBUTE_ADD,
+       /** An attribute was renamed. */
+       ATTRIBUTE_RENAME,
+       /** An attribute was removed. */
+       ATTRIBUTE_REMOVE,
+       /** The afs info struct of an audio file changed. */
+       AFSI_CHANGE,
+       /** The afh info struct of an audio file changed. */
+       AFHI_CHANGE,
+       /** An audio file was renamed. */
+       AUDIO_FILE_RENAME,
+       /** An audio file was added. */
+       AUDIO_FILE_ADD,
+       /** An audio file is about to be removed. */
+       AUDIO_FILE_REMOVE,
+       /** A new blob was added. */
+       BLOB_ADD,
+       /** A blob was renamed. */
+       BLOB_RENAME,
+       /** A blob is about to be removed. */
+       BLOB_REMOVE,

 };
 
 };
 

-enum ls_sorting_method {
-       LS_SORT_BY_PATH, /* -sp (default) */
-       LS_SORT_BY_SCORE, /* -ss */
-       LS_SORT_BY_LAST_PLAYED, /* -sl */
-       LS_SORT_BY_NUM_PLAYED, /* -sn */
-       LS_SORT_BY_FREQUENCY, /* -sf */
-       LS_SORT_BY_CHANNELS, /* -sc */
-       LS_SORT_BY_IMAGE_ID, /* -si */
-       LS_SORT_BY_LYRICS_ID, /* -sy */
-       LS_SORT_BY_BITRATE, /* -sb */
-       LS_SORT_BY_DURATION, /* -sd */
-       LS_SORT_BY_AUDIO_FORMAT, /* -sa */
-       LS_SORT_BY_HASH, /* -sh */
+struct rmatt_event_data {
+       const char *name;
+       unsigned char bitnum;

 };
 
 };
 

-enum ls_listing_mode {
-       LS_MODE_SHORT,
-       LS_MODE_LONG,
-       LS_MODE_VERBOSE,
-       LS_MODE_MBOX
-};

 
 

-enum ls_flags {
-       LS_FLAG_FULL_PATH = 1,
-       LS_FLAG_ADMISSIBLE_ONLY = 2,
-       LS_FLAG_REVERSE = 4,
+struct afsi_change_event_data {
+       struct osl_row *aft_row;
+       struct afs_info *old_afsi;

 };
 
 };
 

-struct ls_widths {
-       unsigned short score_width;
-       unsigned short image_id_width;
-       unsigned short lyrics_id_width;
-       unsigned short bitrate_width;
-       unsigned short frequency_width;
-       unsigned short duration_width;
-       unsigned short num_played_width;
+/** Function pointers for table handling.  */
+struct afs_table {
+       /** Initializes the other pointers in this struct. */
+       void (*init)(struct afs_table *t);
+       /** The name of this table. */
+       const char *name;
+       /** Gets called on startup and on \p SIGHUP. */
+       int (*open)(const char *base_dir);
+       /** Gets called on shutdown and on \p SIGHUP. */
+       void (*close)(void);
+       /** Called by the \a init afs command. */
+       int (*create)(const char *);
+       /** Handles afs events. */
+       int (*event_handler)(enum afs_events event, struct para_buffer *pb,
+               void *data);

 };
 
 };
 

+enum play_mode {PLAY_MODE_MOOD, PLAY_MODE_PLAYLIST};
+
+/**
+ * Data about one audio file.
+ *
+ * Needed to produce ls and stat output.
+ */

 struct ls_data {
 struct ls_data {

-       struct audio_format_info afhi;
+       /** Usual audio format handler information. */
+       struct afh_info afhi;
+       /** Audio file selector information. */

        struct afs_info afsi;
        struct afs_info afsi;

+       /** The full path of the audio file. */

        char *path;
        char *path;

+       /** The score value (if -a was given). */

        long score;
        long score;

+       /** The sha1 hash of audio file. */

        HASH_TYPE *hash;
 };
        HASH_TYPE *hash;
 };

+int make_status_items(struct ls_data *d, struct para_buffer *pb);
+void make_empty_status_items(char *buf);
+
+/** At most that many bytes will be passed from afs to para_server. */
+#define VERBOSE_LS_OUTPUT_SIZE 4096

 
 

-struct ls_options {
-       unsigned flags;
-       enum ls_sorting_method sorting;
-       enum ls_listing_mode mode;
-       char **patterns;
-       int num_patterns;
-       struct ls_widths widths;
-       uint32_t array_size;
-       uint32_t num_matching_paths;
-       struct ls_data *data;
-       struct ls_data **data_ptr;
+/** Data about the current audio file, passed from afs to server. */
+struct audio_file_data {
+       /** Same info as ls -lv -p current audio_file. */
+       char verbose_ls_output[VERBOSE_LS_OUTPUT_SIZE];
+       /** The open file descriptor to the current audio file. */
+       int fd;
+       /** Vss needs this for streaming. */
+       struct afh_info afhi;

 };
 
 };
 

-enum play_mode {PLAY_MODE_MOOD, PLAY_MODE_PLAYLIST};
+enum afs_server_code {
+       NEXT_AUDIO_FILE,
+       NO_ADMISSIBLE_FILES,
+       AFD_CHANGE
+};

 
 

-struct audio_file_data {
-       enum play_mode current_play_mode;
-       long score;
-       struct afs_info afsi;
-       struct audio_format_info afhi;
-       char *path;
-       struct osl_object map;
+/** Flags passed to for_each_matching_row(). */
+enum pattern_match_flags {
+       /** Loop in reverse order. */
+       PM_REVERSE_LOOP = 1,
+       /** If no pattern is given, loop over all rows. */
+       PM_NO_PATTERN_MATCHES_EVERYTHING = 2,
+       /** If the data in match_column is the empty string, skip this row. */
+       PM_SKIP_EMPTY_NAME = 4,
+};
+
+/** Structure passed to for_each_matching_row(). */
+struct pattern_match_data {
+       /** Loop over all rows in this table. */
+       struct osl_table *table;
+       /** Determines the loop order. Must be an rbtree column. */
+       unsigned loop_col_num;
+       /** Data from this column is matched against the given patterns. */
+       unsigned match_col_num;
+       /** \see pattern_match_flags. */
+       unsigned pm_flags;
+       /** This value is passed verbatim to fnmatch(). */
+       int fnmatch_flags;
+       /** Null-terminated array of patterns. */
+       struct osl_object patterns;
+       /** Data pointer passed to the action function. */
+       void *data;
+       /** For each matching row, this function will be called. */
+       int (*action)(struct osl_table *table, struct osl_row *row, const char *name, void *data);

 };
 
 };
 

-/* afs */
-typedef int callback_function(const struct osl_object *, struct osl_object *);
-__noreturn int afs_init(uint32_t cookie, int socket_fd);
+
+/**
+ * Afs command handlers run as a process which is not related to the afs
+ * process, i.e. they can not change the address space of afs directly.
+ * Therefore afs commands typically consist of two functions: The command
+ * handler and the corresponding callback function that runs in afs context.
+ *
+ * \sa send_callback_request().
+ */
+typedef void callback_function(int fd, const struct osl_object *);
+
+/**
+ * Callbacks send chunks to data back to the command handler. Pointers to
+ * this type of function are used by \ref send_callback_request and friends
+ * to deal with the data in the command handler process.
+ *
+ * \sa \ref send_callback_request().
+ */
+typedef int callback_result_handler(struct osl_object *result, void *private);
+int send_result(struct osl_object *result, void *fd_ptr);
+int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr);
+
+__noreturn void afs_init(uint32_t cookie, int socket_fd);
+void afs_event(enum afs_events event, struct para_buffer *pb,
+       void *data);

 int send_callback_request(callback_function *f, struct osl_object *query,
 int send_callback_request(callback_function *f, struct osl_object *query,

-       struct osl_object *result);
-int send_standard_callback_request(int argc, char * const * const argv,
-               callback_function *f, struct osl_object *result);
+               callback_result_handler *result_handler,
+               void *private_result_data);

 int send_option_arg_callback_request(struct osl_object *options,
 int send_option_arg_callback_request(struct osl_object *options,

-       int argc, char * const * const argv, callback_function *f,
-       struct osl_object *result);
+               int argc,  char * const * const argv, callback_function *f,
+               callback_result_handler *result_handler,
+               void *private_result_data);
+int send_standard_callback_request(int argc,  char * const * const argv,
+               callback_function *f, callback_result_handler *result_handler,
+               void *private_result_data);

 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,

-               unsigned max_len, struct osl_object *result);
+               unsigned max_len, callback_result_handler *result_handler,
+               void *private_result_data);

 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2);
 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2);

-int para_atol(const char *str, long *result);
-int open_next_audio_file(struct audio_file_data *afd);
-int close_audio_file(struct audio_file_data *afd);
+int for_each_matching_row(struct pattern_match_data *pmd);

 
 /* score */
 
 /* score */

-int score_init(struct table_info *ti, const char *db);
-void score_shutdown(enum osl_close_flags flags);
+void score_init(struct afs_table *t);

 int admissible_file_loop(void *data, osl_rbtree_loop_func *func);
 int admissible_file_loop_reverse(void *data, osl_rbtree_loop_func *func);
 int score_get_best(struct osl_row **aft_row, long *score);
 int admissible_file_loop(void *data, osl_rbtree_loop_func *func);
 int admissible_file_loop_reverse(void *data, osl_rbtree_loop_func *func);
 int score_get_best(struct osl_row **aft_row, long *score);


@@ -117,48 +211,57 @@ int score_add(const struct osl_row *row, long score);
 int score_update(const struct osl_row *aft_row, long new_score);
 int get_num_admissible_files(unsigned *num);
 int score_delete(const struct osl_row *aft_row);
 int score_update(const struct osl_row *aft_row, long new_score);
 int get_num_admissible_files(unsigned *num);
 int score_delete(const struct osl_row *aft_row);

-int row_belongs_to_score_table(const struct osl_row *aft_row);
+int clear_score_table(void);
+int row_belongs_to_score_table(const struct osl_row *aft_row, unsigned *rank);

 
 /* attribute */
 
 /* attribute */

-int attribute_init(struct table_info *ti, const char *db);
-void attribute_shutdown(enum osl_close_flags flags);
+void attribute_init(struct afs_table *t);

 void get_attribute_bitmap(const uint64_t *atts, char *buf); /* needed by com_ls() */
 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum);
 int get_attribute_text(uint64_t *atts, const char *delim, char **text);
 
 /* aft */
 void get_attribute_bitmap(const uint64_t *atts, char *buf); /* needed by com_ls() */
 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum);
 int get_attribute_text(uint64_t *atts, const char *delim, char **text);
 
 /* aft */

-int aft_init(struct table_info *ti, const char *db);
-void aft_shutdown(enum osl_close_flags flags);
-int aft_get_row_of_path(char *path, struct osl_row **row);
-int open_and_update_audio_file(struct osl_row *aft_row, struct audio_file_data *afd);
+void aft_init(struct afs_table *t);
+int aft_get_row_of_path(const char *path, struct osl_row **row);
+int open_and_update_audio_file(struct osl_row *aft_row, long score,
+       struct audio_file_data *afd);
+int load_afd(int shmid, struct audio_file_data *afd);

 int load_afsi(struct afs_info *afsi, struct osl_object *obj);
 void save_afsi(struct afs_info *afsi, struct osl_object *obj);
 int get_afsi_of_row(const struct osl_row *row, struct afs_info *afsi);
 int load_afsi(struct afs_info *afsi, struct osl_object *obj);
 void save_afsi(struct afs_info *afsi, struct osl_object *obj);
 int get_afsi_of_row(const struct osl_row *row, struct afs_info *afsi);

+int get_afhi_of_row(const struct osl_row *row, struct afh_info *afhi);
+int get_afsi_of_path(const char *path, struct afs_info *afsi);

 int get_audio_file_path_of_row(const struct osl_row *row, char **path);
 int get_afsi_object_of_row(const struct osl_row *row, struct osl_object *obj);
 int audio_file_loop(void *private_data, osl_rbtree_loop_func *func);
 int get_audio_file_path_of_row(const struct osl_row *row, char **path);
 int get_afsi_object_of_row(const struct osl_row *row, struct osl_object *obj);
 int audio_file_loop(void *private_data, osl_rbtree_loop_func *func);

+void aft_check_callback(int fd, __a_unused const struct osl_object *query);

 
 /* mood */
 
 /* mood */

-int mood_open(char *mood_name);
-void mood_close(void);
-int mood_update_audio_file(const struct osl_row *aft_row, struct afs_info *old_afsi);
-int mood_reload(void);
-int mood_delete_audio_file(const struct osl_row *aft_row);
+int change_current_mood(char *mood_name);
+void close_current_mood(void);
+int reload_current_mood(void);
+void mood_check_callback(int fd, __a_unused const struct osl_object *query);

 
 
 /* playlist */
 int playlist_open(char *name);
 void playlist_close(void);
 
 
 /* playlist */
 int playlist_open(char *name);
 void playlist_close(void);

-int playlist_update_audio_file(struct osl_row *aft_row);
+void playlist_check_callback(int fd, __a_unused const struct osl_object *query);

 
 /** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
 
 
 
 /** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
 
 

+/** Define exported functions and a table pointer for an osl blob table. */

 #define DECLARE_BLOB_SYMBOLS(table_name, cmd_prefix) \
 #define DECLARE_BLOB_SYMBOLS(table_name, cmd_prefix) \

-       int table_name ## _init(struct table_info *ti, const char *db); \
-       void table_name ## _shutdown(enum osl_close_flags flags); \
+       void table_name ## _init(struct afs_table *t); \

        int cmd_prefix ## _get_name_by_id(uint32_t id, char **name); \
        int cmd_prefix ## _get_name_by_id(uint32_t id, char **name); \

+       int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def); \
+       int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def); \
+       int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
+               char **name, struct osl_object *def); \
+       int table_name ##_event_handler(enum afs_events event, \
+               struct para_buffer *pb, void *data); \

        extern struct osl_table *table_name ## _table;
 
 DECLARE_BLOB_SYMBOLS(lyrics, lyr);
        extern struct osl_table *table_name ## _table;
 
 DECLARE_BLOB_SYMBOLS(lyrics, lyr);


@@ -166,7 +269,19 @@ DECLARE_BLOB_SYMBOLS(images, img);
 DECLARE_BLOB_SYMBOLS(moods, mood);
 DECLARE_BLOB_SYMBOLS(playlists, pl);
 
 DECLARE_BLOB_SYMBOLS(moods, mood);
 DECLARE_BLOB_SYMBOLS(playlists, pl);
 

-enum blob_table_columns {BLOBCOL_ID, BLOBCOL_NAME, BLOBCOL_DEF, NUM_BLOB_COLUMNS};
+/** The columns of an abstract blob table. */
+enum blob_table_columns {
+       /** The identifier, a positive integer that never repeats. */
+       BLOBCOL_ID,
+       /** The unique name of the blob. */
+       BLOBCOL_NAME,
+       /** The actual blob contents. */
+       BLOBCOL_DEF,
+       /** A blob table has that many columns. */
+       NUM_BLOB_COLUMNS
+};
+
+/** Define an osl table description for a blob table. */

 #define DEFINE_BLOB_TABLE_DESC(table_name) \
        struct osl_table_description table_name ## _table_desc = { \
                .name = #table_name, \
 #define DEFINE_BLOB_TABLE_DESC(table_name) \
        struct osl_table_description table_name ## _table_desc = { \
                .name = #table_name, \


@@ -175,8 +290,10 @@ enum blob_table_columns {BLOBCOL_ID, BLOBCOL_NAME, BLOBCOL_DEF, NUM_BLOB_COLUMNS
                .column_descriptions = blob_cols \
        };
 
                .column_descriptions = blob_cols \
        };
 

+/** Define a pointer to an osl blob table with a canonical name. */

 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
 
 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
 

+/** Define a blob table. */

 #define INIT_BLOB_TABLE(table_name) \
        DEFINE_BLOB_TABLE_DESC(table_name); \
        DEFINE_BLOB_TABLE_PTR(table_name);
 #define INIT_BLOB_TABLE(table_name) \
        DEFINE_BLOB_TABLE_DESC(table_name); \
        DEFINE_BLOB_TABLE_PTR(table_name);