X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=audiod_command.c;h=bb916713254d96829a953a84121b0a3daeb992ba;hp=e57283cebe32a7dab6955f9d519b2752bd09e967;hb=c36f5e92c572c8eaf77c227bce164b9e98a74a3e;hpb=5440b8c0464829022a0ba5dd5daa931b15712a11 diff --git a/audiod_command.c b/audiod_command.c index e57283ce..bb916713 100644 --- a/audiod_command.c +++ b/audiod_command.c @@ -6,19 +6,17 @@ /** \file audiod_command.c commands for para_audiod */ +#include #include #include #include "para.h" #include "audiod.cmdline.h" #include "list.h" -#include "close_on_fork.h" #include "sched.h" #include "ggo.h" #include "filter.h" -#include "grab_client.cmdline.h" #include "grab_client.h" - #include "error.h" #include "audiod.h" #include "net.h" @@ -29,10 +27,150 @@ extern char *stat_item_values[NUM_STAT_ITEMS]; - -/** iterate over the array of all audiod commands */ +/** Iterate over the array of all audiod commands. */ #define FOR_EACH_COMMAND(c) for (c = 0; audiod_cmds[c].name; c++) +/** The maximal number of simultaneous connections. */ +#define MAX_STAT_CLIENTS 50 + +/** Flags used for the stat command of para_audiod. */ +enum stat_client_flags { + /** Enable parser-friendly output. */ + SCF_PARSER_FRIENDLY = 1, +}; + +/** + * Describes a status client of para_audiod. + * + * There's one such structure per audiod client that sent the 'stat' command. + * + * A status client is identified by its file descriptor. para_audiod + * keeps a list of connected status clients. + */ +struct stat_client { + /** The stat client's file descriptor. */ + int fd; + /** Bitmask of those status items the client is interested in. */ + uint64_t item_mask; + /** See \ref stat_client flags. s*/ + unsigned flags; + /** Its entry in the list of stat clients. */ + struct list_head node; +}; + +static INITIALIZED_LIST_HEAD(client_list); +static int num_clients; + +/** The list of all status items used by para_{server,audiod,gui}. */ +const char *status_item_list[] = {STATUS_ITEM_ARRAY}; + +static void dump_stat_client_list(void) +{ + struct stat_client *sc; + + list_for_each_entry(sc, &client_list, node) + PARA_INFO_LOG("stat client on fd %d\n", sc->fd); +} +/** + * Add a status client to the list. + * + * \param fd The file descriptor of the client. + * \param mask Bitfield of status items for this client. + * \param parser_friendly Enable parser-friendly output mode. + * + * Only those status items having the bit set in \a mask will be + * sent to the client. + * + * \return Positive value on success, or -E_TOO_MANY_CLIENTS if + * the number of connected clients exceeds #MAX_STAT_CLIENTS. + */ +static int stat_client_add(int fd, uint64_t mask, int parser_friendly) +{ + struct stat_client *new_client; + + if (num_clients >= MAX_STAT_CLIENTS) { + PARA_ERROR_LOG("maximal number of stat clients (%d) exceeded\n", + MAX_STAT_CLIENTS); + return -E_TOO_MANY_CLIENTS; + } + PARA_INFO_LOG("adding client on fd %d\n", fd); + new_client = para_calloc(sizeof(struct stat_client)); + new_client->fd = fd; + new_client->item_mask = mask; + if (parser_friendly) + new_client->flags = SCF_PARSER_FRIENDLY; + para_list_add(&new_client->node, &client_list); + dump_stat_client_list(); + num_clients++; + return 1; +} +/** + * Write a message to all connected status clients. + * + * \param item_num The number of the status item of \a msg. + * + * On write errors, remove the status client from the client list and close its + * file descriptor. + */ +void stat_client_write_item(int item_num) +{ + struct stat_client *sc, *tmp; + struct para_buffer pb = {.flags = 0}; + struct para_buffer pfpb = {.flags = PBF_SIZE_PREFIX}; + const uint64_t one = 1; + + list_for_each_entry_safe(sc, tmp, &client_list, node) { + int fd = sc->fd, ret; + + if (!((one << item_num) & sc->item_mask)) + continue; + if (write_ok(fd) > 0) { + struct para_buffer *b = + (sc->flags & SCF_PARSER_FRIENDLY)? &pfpb : &pb; + char *msg = stat_item_values[item_num]; + if (!b->buf) + WRITE_STATUS_ITEM(b, item_num, "%s\n", + msg? msg : ""); + ret = write(fd, b->buf, b->offset); + if (ret == b->offset) + continue; + } + /* write error or fd not ready for writing */ + close(fd); + num_clients--; + PARA_INFO_LOG("deleting client on fd %d\n", fd); + list_del(&sc->node); + free(sc); + dump_stat_client_list(); + } + free(pb.buf); + free(pfpb.buf); +// if (num_clients) +// PARA_DEBUG_LOG("%d client(s)\n", num_clients); +} + +/** + * Check if string is a known status item. + * + * \param item Buffer containing the text to check. + * + * \return If \a item is a valid status item, the number of that status item is + * returned. Otherwise, this function returns \p -E_UNKNOWN_STAT_ITEM. + */ +static int stat_item_valid(const char *item) +{ + int i; + if (!item || !*item) { + PARA_ERROR_LOG("%s\n", "no item"); + return -E_UNKNOWN_STAT_ITEM; + } + FOR_EACH_STATUS_ITEM(i) + if (!strcmp(status_item_list[i], item)) + return i; + PARA_ERROR_LOG("invalid stat item: %s\n", item); + return -E_UNKNOWN_STAT_ITEM; +} + static int client_write(int fd, const char *buf) { size_t len; @@ -214,68 +352,9 @@ int com_stat(int fd, int argc, char **argv) return ret; } -#if 0 -static struct filter_node *find_filter_node(int slot_num, int format, int filternum) -{ - int i; - - FOR_EACH_SLOT(i) { - struct slot_info *s = &slot[i]; - if (s->format < 0 || !s->fc) - continue; - if (slot_num >= 0 && slot_num != i) - continue; - if (format >= 0 && s->format != format) - continue; - if (num_filters(i) <= filternum) - continue; - /* success */ - return s->fc->filter_nodes + filternum; - } - return NULL; -} -#endif - -int com_grab(int fd, __a_unused int argc, __a_unused char **argv) +int com_grab(int fd, int argc, char **argv) { - client_write(fd, "grab is currently b0rken\n"); - close(fd); - return 1; -#if 0 - struct grab_client *gc; - struct filter_node *fn; - int i, err; - char *msg; - - gc = grab_client_new(fd, cmdline, &err); - if (!gc) - goto err_out; - fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg); - if (fn) - activate_grab_client(gc, fn); - return 1; -err_out: - if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN) - return err; - if (err == -E_GC_HELP_GIVEN) { - msg = make_message("%s\n\n", grab_client_args_info_usage); - for (i = 0; grab_client_args_info_help[i]; i++) { - char *tmp = make_message("%s%s\n", msg, - grab_client_args_info_help[i]); - free(msg); - msg = tmp; - } - } else - msg = make_message("%s %s\n", - GRAB_CLIENT_CMDLINE_PARSER_PACKAGE, - GRAB_CLIENT_CMDLINE_PARSER_VERSION); - err = client_write(fd, msg); - free(msg); - if (err < 0) - return err; - close(fd); - return 1; -#endif + return grab_client_new(fd, argc, argv); } __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv) @@ -390,6 +469,7 @@ out: } return ret; } + /** * Send the current audiod status to all connected stat clients. */