/*
- * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
* and para_audiod.
*/
-
-#include <sys/types.h>
-#include <dirent.h>
+#include <regex.h>
#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
-/**
- * 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. */
- long unsigned item_mask;
- /** Its entry in the list of stat clients. */
- struct list_head node;
-};
-static struct list_head client_list;
-static int initialized;
-static int num_clients;
+/** The minimal length of a status item buffer. */
+#define MIN_STAT_ITEM_LEN 9 /* 5 + 2 + 2, e.g. '0005 00:\n' */
-/** 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;
-
- if (!initialized)
- return;
- 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.
+ * Call a function for each complete status item of a buffer.
*
- * \param fd The file descriptor of the client.
- * \param mask Bitfield of status items for this client.
+ * \param item_buf The source buffer.
+ * \param num_bytes The length of \a buf.
+ * \param item_handler Function to call for each complete item.
*
- * Only those status items having the bit set in \a mask will be
- * sent to the client.
+ * \return Negative on errors, the number of bytes _not_ passed to \a
+ * item_handler.
*
- * \return Positive value on success, or -E_TOO_MANY_CLIENTS if
- * the number of connected clients exceeds #MAX_STAT_CLIENTS.
+ * Status items are expected in the format used by parser-friendly output mode
+ * of the stat command of para_client/para_audioc.
*/
-int stat_client_add(int fd, long unsigned mask)
+int for_each_stat_item(char *item_buf, size_t num_bytes,
+ int (*item_handler)(int, char *))
{
- 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;
- }
- if (!initialized) {
- INIT_LIST_HEAD(&client_list);
- initialized = 1;
- }
- PARA_INFO_LOG("adding client on fd %d\n", fd);
- new_client = para_malloc(sizeof(struct stat_client));
- new_client->fd = fd;
- 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 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(const char *msg, int itemnum)
-{
- struct stat_client *sc, *tmp;
- size_t len = strlen(msg);
-
- if (!initialized || !len)
- return;
- list_for_each_entry_safe(sc, tmp, &client_list, node) {
- int fd = sc->fd, ret;
-
- if (!((1 << itemnum) & sc->item_mask))
- continue;
- if (write_ok(fd) > 0) {
- ret = write(fd, msg, len);
- PARA_DEBUG_LOG("dumped %s to fd %d, ret = %d\n", msg, fd, ret);
- if (ret == len)
+ char *buf = item_buf;
+ int len = num_bytes;
+
+ for (;;) {
+ int i, ret, item_len, item_num = 0;
+ if (len < MIN_STAT_ITEM_LEN)
+ break;
+ ret = read_size_header(buf);
+ if (ret < 0)
+ return ret;
+ item_len = ret;
+ if (item_len > len - 5) /* item not complete */
+ break;
+ for (i = 0; i < 2; i++) {
+ unsigned char c = buf[5 + i];
+ item_num <<= 4;
+ if (c >= '0' && c <= '9') {
+ item_num += c - '0';
continue;
+ }
+ if (c >= 'a' && c <= 'f') {
+ item_num += c - 'a' + 10;
+ continue;
+ }
+ return -E_STAT_ITEM_PARSE;
}
- /* 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();
- }
- 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.
- */
-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;
-}
-
-/**
- * Check if line starts with known status item.
- *
- * \param line Buffer containing the line.
- *
- * \return If the beginning of \a line matches any paraslash status item and is
- * followed by a colon, the number of that status item is returned. Otherwise,
- * this function returns \p -E_UNKNOWN_STAT_ITEM.
- */
-int stat_line_valid(const char *line)
-{
- int i;
- size_t line_len;
-
- if (!line || !*line)
- return -E_UNKNOWN_STAT_ITEM;
- line_len = strlen(line);
- FOR_EACH_STATUS_ITEM(i) {
- const char *s = status_item_list[i];
- size_t item_len = strlen(s);
-
- if (line_len > item_len && line[item_len] == ':' &&
- !strncmp(line, s, item_len))
- return i;
+ if (buf[7] != ':' || buf[5 + item_len - 1] != '\n')
+ return -E_STAT_ITEM_PARSE;
+ buf[5 + item_len - 1] = '\0';
+ if (item_num >= NUM_STAT_ITEMS)
+ PARA_WARNING_LOG("unknown status item %d: %s\n",
+ item_num, buf + 8);
+ else {
+ ret = item_handler(item_num, buf + 8);
+ if (ret < 0)
+ return ret;
+ }
+ buf += 5 + item_len;
+ len -= 5 + item_len;
+ assert(len >= 0 && buf <= item_buf + num_bytes);
}
- return -E_UNKNOWN_STAT_ITEM;
+ assert(len >= 0);
+ if (len && len != num_bytes)
+ memmove(item_buf, item_buf + num_bytes - len, len);
+ return len;
}
-
projects / paraslash.git / blobdiff