sched/audiod feature: task list and kill
authorAndre <maan@ensslin.(none)>
Thu, 1 Jun 2006 17:54:45 +0000 (19:54 +0200)
committerAndre <maan@ensslin.(none)>
Thu, 1 Jun 2006 17:54:45 +0000 (19:54 +0200)
This allows to control the internal state of the scheduler.

NEWS
audiod.c
error.h
sched.c
sched.h

diff --git a/NEWS b/NEWS
index 69d303b..06330e7 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -20,6 +20,8 @@ A bunch of new features and core changes.
 
        o random/playlist selector: improved info strings
 
+       o new audiod commands: tasks, kill
+
 
 0.2.12 (2006-05-12) "oriented abstraction"
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
index 68c84fb..f08be18 100644 (file)
--- a/audiod.c
+++ b/audiod.c
@@ -168,10 +168,12 @@ struct audiod_command {
 static int com_grab(int, char *);
 static int com_cycle(int, int, char **);
 static int com_help(int, int, char **);
+static int com_kill(int, int, char **);
 static int com_off(int, int, char **);
 static int com_on(int, int, char **);
 static int com_sb(int, int, char **);
 static int com_stat(int, int, char **);
+static int com_tasks(int, int, char **);
 static int com_term(int, int, char **);
 static struct audiod_command cmds[] = {
 {
@@ -210,6 +212,16 @@ static struct audiod_command cmds[] = {
 "\n"
 "                              -- Beatles: Help\n"
 
+},
+{
+.name = "kill",
+.handler = com_kill,
+.description = "kill an active audiod task",
+.synopsis = "kill task_id [task_id ...]",
+.help =
+
+"call sched_unregister() and the event_handler of the given task(s)\n"
+
 },
 {
 .name = "off",
@@ -252,6 +264,16 @@ static struct audiod_command cmds[] = {
 
 "Dump given status items (all if none given) to stdout.\n"
 
+},
+{
+.name = "tasks",
+.handler = com_tasks,
+.description = "list current tasks",
+.synopsis = "tasks",
+.help =
+
+"print the list of task ids together with the status of each task\n"
+
 },
 {
 .name = "term",
@@ -605,6 +627,8 @@ int num_filters(int audio_format_num)
 static void filter_event_handler(struct task *t)
 {
        PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
+       struct filter_chain *fc = t->private_data;
+       fc->eof = 1;
        unregister_task(t);
 }
 
@@ -677,15 +701,10 @@ static struct filter_node *find_filter_node(int slot_num, int format, int filter
 static void wng_event_handler(struct task *t)
 {
        struct writer_node_group *wng = t->private_data;
-       int i;
 
+       PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
+       wng->eof = 1;
        wng_unregister(wng);
-       FOR_EACH_SLOT(i) {
-               struct slot_info *s = &slot[i];
-               if (s->wng != wng)
-                       continue;
-               PARA_INFO_LOG("slot %d: %s\n", i, PARA_STRERROR(-t->ret));
-       }
 }
 
 static void open_writers(int slot_num)
@@ -730,9 +749,11 @@ static void open_writers(int slot_num)
 
 static void rn_event_handler(struct task *t)
 {
-//     struct receiver_node *rn = t->private_data;
+       struct receiver_node *rn = t->private_data;
+
        PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
        unregister_task(t);
+       rn->eof = 1;
 }
 
 static void open_receiver(int format)
@@ -1226,6 +1247,33 @@ out:
        return ret;
 }
 
+static int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
+{
+       char *tl = get_task_list();
+       int ret = 1;
+       if (tl)
+               ret = client_write(fd, tl);
+       free(tl);
+       if (ret > 0)
+               close(fd);
+       return ret;
+}
+
+static int com_kill(int fd, int argc, char **argv)
+{
+       int i, ret = 1;
+       if (argc < 2)
+               return -E_AUDIOD_SYNTAX;
+       for (i = 1; i < argc; i++) {
+               ret = kill_task(argv[i]);
+               if (ret < 0)
+                       break;
+       }
+       if (ret > 0)
+               close(fd);
+       return ret;
+}
+
 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
 {
        int i, ret;
@@ -1492,7 +1540,11 @@ static int open_stat_pipe(void)
 void signal_event_handler(struct task *t)
 {
        struct signal_task *st = t->private_data;
-       handle_signal(st->signum);
+
+       if (t->ret != -E_SIGNAL_CAUGHT)
+               PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
+       else
+               handle_signal(st->signum);
 }
 
 void signal_pre_select(struct sched *s, struct task *t)
@@ -1555,6 +1607,16 @@ static void init_command_task(struct command_task *ct)
        sprintf(ct->task.status, "command task");
 }
 
+static void status_event_handler(__a_unused struct task *t)
+{
+       PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
+       close_stat_pipe();
+       /* avoid busy loop if server is down */
+       while (sleep(1) > 0) /* FIXME */
+               ; /* try again*/
+
+}
+
 static void status_pre_select(struct sched *s, struct task *t)
 {
        struct status_task *st = t->private_data;
@@ -1573,29 +1635,26 @@ static void status_pre_select(struct sched *s, struct task *t)
 static void status_post_select(struct sched *s, struct task *t)
 {
        struct status_task *st = t->private_data;
-       int ret;
 
        t->ret = 1;
        if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
                return;
-       ret = read(st->fd, st->buf + st->loaded,
-               STRINGSIZE - 1 - st->loaded);
-       if (ret <= 0) {
-               close_stat_pipe();
-               /* avoid busy loop if server is down */
-               while (sleep(1) > 0) /* FIXME */
-                       ; /* try again*/
-       } else {
-               st->buf[ret + st->loaded] = '\0';
-               st->loaded = for_each_line(st->buf, ret + st->loaded,
-                       &check_stat_line);
+       t->ret = read(st->fd, st->buf + st->loaded, STRINGSIZE - 1 - st->loaded);
+       if (t->ret <= 0) {
+               if (!t->ret)
+                       t->ret = -E_STATUS_EOF;
+               return;
        }
+       st->buf[t->ret + st->loaded] = '\0';
+       st->loaded = for_each_line(st->buf, t->ret + st->loaded,
+               &check_stat_line);
 }
 
 static void init_status_task(struct status_task *st)
 {
        st->task.pre_select = status_pre_select;
        st->task.post_select = status_post_select;
+       st->task.event_handler = status_event_handler;
        st->task.private_data = st;
        st->task.flags = 0;
        st->loaded = 0;
diff --git a/error.h b/error.h
index b08a31e..430c12f 100644 (file)
--- a/error.h
+++ b/error.h
@@ -82,12 +82,17 @@ enum para_subsystem {
 #define ORTP_SEND_ERRORS
 #define GUI_ERRORS
 #define RINGBUFFER_ERRORS
-#define SCHED_ERRORS
+
 
 
 extern const char **para_errlist[];
 /** \endcond */
 
+#define SCHED_ERRORS \
+       PARA_ERROR(TASK_KILLED, "task killed"), \
+       PARA_ERROR(NO_SUCH_TASK, "task not found"), \
+
+
 #define STDIN_ERRORS \
        PARA_ERROR(STDIN_READ, "failed to read from stdin"), \
        PARA_ERROR(STDIN_EOF, "end of file"), \
@@ -149,6 +154,8 @@ extern const char **para_errlist[];
        PARA_ERROR(CLIENT_WRITE, "client write error"), \
        PARA_ERROR(UCRED_PERM, "permission denied"), \
        PARA_ERROR(INVALID_AUDIOD_CMD, "invalid command"), \
+       PARA_ERROR(AUDIOD_SYNTAX, "syntax error"), \
+       PARA_ERROR(STATUS_EOF, "server closed status connection"), \
 
 
 #define FILTER_CHAIN_ERRORS \
diff --git a/sched.c b/sched.c
index 9356dd0..879ab80 100644 (file)
--- a/sched.c
+++ b/sched.c
@@ -106,5 +106,49 @@ void sched_shutdown(void)
                unregister_task(t);
 };
 
+char *get_task_list(void)
+{
+       struct task *t, *tmp;
+       char *msg = NULL;
+       list_for_each_entry_safe(t, tmp, &pre_select_list, pre_select_node) {
+               char *tmp_msg;
+               tmp_msg = make_message("%s%p\t%s\n", msg? msg : "", t, t->status);
+               free(msg);
+               msg = tmp_msg;
+       }
+       list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node) {
+               char *tmp_msg;
+               if (t->pre_select)
+                       continue;
+               tmp_msg = make_message("%s%p\t%s\n", msg? msg : "", t, t->status);
+               free(msg);
+               msg = tmp_msg;
+       }
+       //PARA_DEBUG_LOG("task list:\n%s", msg);
+       return msg;
+}
 
-//char *get_tast_list();
+int kill_task(char *id)
+{
+       struct task *t, *tmp;
+       char buf[20];
+       list_for_each_entry_safe(t, tmp, &pre_select_list, pre_select_node) {
+               sprintf(buf, "%p", t);
+               if (strcmp(id, buf))
+                       continue;
+               t->ret = -E_TASK_KILLED;
+               if (t->event_handler)
+                       t->event_handler(t);
+               return 1;
+       }
+       list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node) {
+               sprintf(buf, "%p", t);
+               if (strcmp(id, buf))
+                       continue;
+               t->ret = -E_TASK_KILLED;
+               if (t->event_handler)
+                       t->event_handler(t);
+               return 1;
+       }
+       return -E_NO_SUCH_TASK;
+}
diff --git a/sched.h b/sched.h
index 9855475..0363f0d 100644 (file)
--- a/sched.h
+++ b/sched.h
@@ -27,3 +27,5 @@ void *register_task(struct task *t);
 void unregister_task(struct task *t);
 int sched(struct sched *s);
 void init_sched(void);
+char *get_task_list(void);
+int kill_task(char *id);