X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=stat.c;h=ce6adeda2019454acfdf4ca5759e4a29cc4c2e64;hp=4ad1b5a88d957f411c5ccad6bb00f871e440f842;hb=32facbd1b7948f146515e53194cfd4f33c54353f;hpb=418339759697ff6884e77c809805645c5f4db5b5 diff --git a/stat.c b/stat.c index 4ad1b5a8..ce6adeda 100644 --- a/stat.c +++ b/stat.c @@ -1,53 +1,43 @@ /* - * Copyright (C) 2005-2006 Andre Noll + * Copyright (C) 2005-2007 Andre Noll * - * 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 program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. + * Licensed under the GPL v2. For licencing details see COPYING. */ /** * \file stat.c functions used for sending/receiving the status of para_server * and para_audiod */ + + +#include +#include + #include "para.h" #include "close_on_fork.h" #include "list.h" #include "error.h" #include "string.h" +#include "fd.h" /** the maximal number of simultaneous connections */ #define MAX_STAT_CLIENTS 50 /** - * The structure associated with a connected client that sent the 'stat' command -* + * 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; -/** - * - * its entry in the list of stat clients -*/ -struct list_head node; + /** the stat client's file descriptor */ + int fd; + /** bitmask of those status items the client is interested in */ + long unsigned item_mask; + /** its entry in the list of stat clients */ + struct list_head node; }; static struct list_head client_list; @@ -91,9 +81,8 @@ const char *status_item_list[NUM_STAT_ITEMS] = { [SI_CURRENT_TIME] = "current_time", [SI_AUDIOD_UPTIME] = "audiod_uptime", - [SI_DBTOOL] = "dbtool" + [SI_SELECTOR] = "dbtool" }; -#define FOR_EACH_STAT_ITEM(i) for (i = 0; i < NUM_STAT_ITEMS; i++) static void dump_stat_client_list(void) { @@ -107,10 +96,16 @@ static void dump_stat_client_list(void) /** * add a status client to the list * + * \param fd the file descriptor of the client + * \param mask bitfield of status items for this client + * + * 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 + * the number of connected clients exceeds #MAX_STAT_CLIENTS. */ -int stat_client_add(int fd) +int stat_client_add(int fd, long unsigned mask) { struct stat_client *new_client; @@ -126,78 +121,76 @@ int stat_client_add(int fd) PARA_INFO_LOG("adding client on fd %d\n", fd); new_client = para_malloc(sizeof(struct stat_client)); new_client->fd = fd; - add_close_on_fork_list(fd); - list_add(&new_client->node, &client_list); + new_client->item_mask = mask; + para_list_add(&new_client->node, &client_list); dump_stat_client_list(); num_clients++; return 1; } /** - * write a message to all connected stat clients + * write a message to all connected status clients * * \param msg a \p NULL terminated buffer + * \param itemnum 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(char *msg) +void stat_client_write(const char *msg, int itemnum) { struct stat_client *sc, *tmp; - char *buf; - ssize_t len; + size_t len = strlen(msg); struct timeval tv = {0 , 0}; - if (!initialized) + if (!initialized || !len) return; - buf = make_message("%s\n", msg); - len = strlen(buf); list_for_each_entry_safe(sc, tmp, &client_list, node) { int fd = sc->fd, ret; fd_set wfds; + + if (!((1 << itemnum) & sc->item_mask)) + continue; FD_ZERO(&wfds); FD_SET(fd, &wfds); // PARA_DEBUG_LOG("%s: p=%lx\n", __func__, (long)p); - do - ret = select(fd + 1, NULL, &wfds, NULL, &tv); - while (ret < 0 && errno == EINTR); - if (ret) { - ret = write(fd, buf, len); + ret = para_select(fd + 1, NULL, &wfds, &tv); + if (ret > 0) { + ret = write(fd, msg, len); PARA_DEBUG_LOG("dumped %s to fd %d, ret = %d\n", msg, fd, ret); if (ret == len ) continue; } /* write error or fd not ready for writing */ close(fd); - del_close_on_fork_list(fd); num_clients--; PARA_INFO_LOG("deleting client on fd %d\n", fd); list_del(&sc->node); free(sc); dump_stat_client_list(); } - free(buf); PARA_DEBUG_LOG("%d client(s)\n", num_clients); } + /** - * send empty status list + * check if string is a known status item. + * + * \param item buffer containing the text to check * - * Send to each connected client the full status item list - * with empty values. + * \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. */ -void dump_empty_status(void) +int stat_item_valid(const char *item) { int i; - char *empty_items = NULL; - - if (!initialized) - return; - FOR_EACH_STAT_ITEM(i) { - char *tmp = make_message("%s%s:\n", empty_items? empty_items : "", - status_item_list[i]); - free(empty_items); - empty_items = tmp; + if (!item || !*item) { + PARA_ERROR_LOG("%s\n", "no item"); + return -E_UNKNOWN_STAT_ITEM; } -// PARA_DEBUG_LOG("%s: empty items: %s\n", __func__, empty_items); - stat_client_write(empty_items); - free(empty_items); + FOR_EACH_STAT_ITEM(i) + if (!strcmp(status_item_list[i], item)) + return i; + return -E_UNKNOWN_STAT_ITEM; } /** @@ -217,7 +210,7 @@ int stat_line_valid(const char *line) if (!line || !*line) return -E_UNKNOWN_STAT_ITEM; line_len = strlen(line); - for (i = 0; i < NUM_STAT_ITEMS; i++) { + FOR_EACH_STAT_ITEM(i) { const char *s = status_item_list[i]; size_t item_len = strlen(s); @@ -228,53 +221,3 @@ int stat_line_valid(const char *line) return -E_UNKNOWN_STAT_ITEM; } -/** - * call a custom function for each complete line - * - * \param buf the buffer containing data seperated by newlines - * \param n the number of bytes in \a buf - * \param line_handler the custom function - * - * If \a line_handler is \p NULL, return number of complete lines in buf. - * Otherwise, call \a line_handler for each complete line. The rest of the - * buffer (last chunk containing incomplete line is moved to the beginning of - * the buffer. - * - * \return If line_handler is not NULL, this function returns the number - * of bytes not handled to \a line_handler. - */ -unsigned for_each_line(char *buf, int n, void (*line_handler)(char *)) -{ - char *start = buf, *end; - int i, num_lines = 0; - - while (start < buf + n) { - char *next_null; - char *next_cr; - - next_cr = memchr(start, '\n', buf + n - start); - next_null = memchr(start, '\0', buf + n - start); - if (!next_cr && !next_null) - break; - if (next_cr && next_null) { - end = next_cr < next_null? next_cr : next_null; - } else if (next_null) { - end = next_null; - } else - end = next_cr; - num_lines++; - if (line_handler) { - *end = '\0'; - line_handler(start); - start = ++end; - } else - start = ++end; - } - if (!line_handler) - return num_lines; - i = buf + n - start; - if (i && i != n) - memmove(buf, start, i); - return i; -} -