X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=audiod_command.c;h=278e6ef69e9f38a081aea8637405de8fcdc6e600;hp=0fe2e5f05edd39e18ed8aac3d0191daec9196026;hb=a23e12ae76608a7ba3d333d8d76d5bbba0ba3ef0;hpb=0806c6f0f2dc341deea1520034420ceadb116082

diff --git a/audiod_command.c b/audiod_command.c
index 0fe2e5f0..278e6ef6 100644
--- a/audiod_command.c
+++ b/audiod_command.c
@@ -35,11 +35,20 @@
 extern struct sched sched;
 extern char *stat_item_values[NUM_STAT_ITEMS];
 
+typedef int audiod_command_handler_t(int, int, char **);
+static audiod_command_handler_t AUDIOD_COMMAND_HANDLERS;
+
 /* Defines one command of para_audiod. */
 struct audiod_command {
 	const char *name;
 	/* Pointer to the function that handles the command. */
-	int (*handler)(int, int, char **);
+	/*
+	 * Command handlers must never never close their file descriptor. A
+	 * positive return value tells audiod that the status items have
+	 * changed. In this case audiod will send an updated version of all
+	 * status items to to each connected stat client.
+	 */
+	audiod_command_handler_t *handler;
 	/* One-line description. */
 	const char *description;
 	/* Summary of the command line options. */
@@ -75,7 +84,7 @@ struct stat_client {
 	int fd;
 	/** Bitmask of those status items the client is interested in. */
 	uint64_t item_mask;
-	/** See \ref stat_client flags. s*/
+	/** See \ref stat_client flags. */
 	unsigned flags;
 	/** Its entry in the list of stat clients. */
 	struct list_head node;
@@ -110,15 +119,19 @@ static void dump_stat_client_list(void)
 static int stat_client_add(int fd, uint64_t mask, int parser_friendly)
 {
 	struct stat_client *new_client;
+	int ret;
 
 	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;
+	ret = dup(fd);
+	if (ret < 0)
+		return -ERRNO_TO_PARA_ERROR(errno);
+	new_client = para_calloc(sizeof(*new_client));
+	new_client->fd = ret;
+	PARA_INFO_LOG("adding client on fd %d\n", new_client->fd);
 	new_client->item_mask = mask;
 	if (parser_friendly)
 		new_client->flags = SCF_PARSER_FRIENDLY;
@@ -176,8 +189,7 @@ void stat_client_write_item(int item_num)
 			continue;
 		b = (sc->flags & SCF_PARSER_FRIENDLY)? &pfpb : &pb;
 		if (!b->buf)
-			(void)WRITE_STATUS_ITEM(b, item_num, "%s\n",
-				msg? msg : "");
+			WRITE_STATUS_ITEM(b, item_num, "%s\n", msg? msg : "");
 		ret = write(sc->fd, b->buf, b->offset);
 		if (ret == b->offset)
 			continue;
@@ -245,17 +257,10 @@ static int dump_commands(int fd)
 	return ret;
 }
 
-/*
- * command handlers don't close their fd on errors (ret < 0) so that
- * its caller can send an error message. Otherwise (ret >= 0) it's up
- * to each individual command to close the fd if necessary.
- */
-
 static int com_help(int fd, int argc, char **argv)
 {
 	int i, ret;
 	char *buf;
-	const char *dflt = "No such command. Available commands:\n";
 
 	if (argc < 2) {
 		ret = dump_commands(fd);
@@ -277,13 +282,11 @@ static int com_help(int fd, int argc, char **argv)
 		free(buf);
 		goto out;
 	}
-	ret = client_write(fd, dflt);
+	ret = client_write(fd, "No such command. Available commands:\n");
 	if (ret > 0)
 		ret = dump_commands(fd);
 out:
-	if (ret >= 0)
-		close(fd);
-	return ret;
+	return ret < 0? ret : 0;
 }
 
 static int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
@@ -294,9 +297,7 @@ static int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
 	if (tl)
 		ret = client_write(fd, tl);
 	free(tl);
-	if (ret > 0)
-		close(fd);
-	return ret;
+	return ret < 0? ret : 0;
 }
 
 static int com_stat(int fd, int argc, char **argv)
@@ -335,48 +336,45 @@ static int com_stat(int fd, int argc, char **argv)
 		char *item = stat_item_values[i];
 		if (!((one << i) & mask))
 			continue;
-		(void)WRITE_STATUS_ITEM(&b, i, "%s\n", item? item : "");
+		WRITE_STATUS_ITEM(&b, i, "%s\n", item? item : "");
 	}
 	ret = client_write(fd, b.buf);
 	if (ret >= 0)
 		ret = stat_client_add(fd, mask, parser_friendly);
 	free(b.buf);
-	return ret;
+	return ret < 0? ret : 0;
 }
 
 static int com_grab(int fd, int argc, char **argv)
 {
-	return grab_client_new(fd, argc, argv, &sched);
+	int ret = grab_client_new(fd, argc, argv, &sched);
+	return ret < 0? ret : 0;
 }
 
-static int com_term(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_term(__a_unused int fd, __a_unused int argc, __a_unused char **argv)
 {
-	close(fd);
 	return -E_AUDIOD_TERM;
 }
 
-static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_on(__a_unused int fd, __a_unused int argc, __a_unused char **argv)
 {
 	audiod_status = AUDIOD_ON;
-	close(fd);
 	return 1;
 }
 
-static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_off(__a_unused int fd, __a_unused int argc, __a_unused char **argv)
 {
 	audiod_status = AUDIOD_OFF;
-	close(fd);
 	return 1;
 }
 
-static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_sb(__a_unused int fd, __a_unused int argc, __a_unused char **argv)
 {
 	audiod_status = AUDIOD_STANDBY;
-	close(fd);
 	return 1;
 }
 
-static int com_cycle(int fd, int argc, char **argv)
+static int com_cycle(__a_unused int fd, int argc, char **argv)
 {
 	switch (audiod_status) {
 		case  AUDIOD_ON:
@@ -389,7 +387,6 @@ static int com_cycle(int fd, int argc, char **argv)
 			return com_off(fd, argc, argv);
 			break;
 	}
-	close(fd);
 	return 1;
 }
 
@@ -404,9 +401,7 @@ static int com_version(int fd, int argc, char **argv)
 		msg = make_message("%s\n", version_single_line("audiod"));
 	ret = client_write(fd, msg);
 	free(msg);
-	if (ret >= 0)
-		close(fd);
-	return ret;
+	return ret < 0? ret : 0;
 }
 
 static int check_perms(uid_t uid, uid_t *whitelist)
@@ -453,7 +448,7 @@ int handle_connect(int accept_fd, fd_set *rfds, uid_t *uid_whitelist)
 	if (ret < 0)
 		goto out;
 	uid = ret;
-	PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
+	PARA_INFO_LOG("connection from user %i, buf: %s\n", ret, buf);
 	ret = check_perms(uid, uid_whitelist);
 	if (ret < 0)
 		goto out;
@@ -471,12 +466,12 @@ int handle_connect(int accept_fd, fd_set *rfds, uid_t *uid_whitelist)
 	ret = -E_INVALID_AUDIOD_CMD;
 out:
 	free_argv(argv);
-	if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
+	if (ret < 0 && ret != -E_CLIENT_WRITE) {
 		char *tmp = make_message("%s\n", para_strerror(-ret));
 		client_write(clifd, tmp);
 		free(tmp);
-		close(clifd);
 	}
+	close(clifd);
 	return ret;
 }