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Manage dlobj lifetime in pcm_hooks.c

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The shared object may be still needed depending on the implementation
of hook-installation functions.  When any hooks are registered in the
installation function, the dlobj has to be kept opened until closing
the PCM instance.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-06-30 11:11:34 +02:00
parent 608cccb088
commit 2a77d217a6
1 changed files with 53 additions and 12 deletions
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65
src/pcm/pcm_hooks.c
View file

@ -43,12 +43,39 @@ struct _snd_pcm_hook {
struct list_head list;
};
struct snd_pcm_hook_dllist {
void *dlobj;
struct list_head list;
};
typedef struct {
snd_pcm_generic_t gen;
struct list_head hooks[SND_PCM_HOOK_TYPE_LAST + 1];
struct list_head dllist;
} snd_pcm_hooks_t;
#endif
static int hook_add_dlobj(snd_pcm_t *pcm, void *dlobj)
{
snd_pcm_hooks_t *h = pcm->private_data;
struct snd_pcm_hook_dllist *dl;
dl = malloc(sizeof(*dl));
if (!dl)
return -ENOMEM;
dl->dlobj = dlobj;
list_add_tail(&dl->list, &h->dllist);
return 0;
}
static void hook_remove_dlobj(struct snd_pcm_hook_dllist *dl)
{
list_del(&dl->list);
snd_dlclose(dl->dlobj);
free(dl);
}
static int snd_pcm_hooks_close(snd_pcm_t *pcm)
{
snd_pcm_hooks_t *h = pcm->private_data;
@ -71,6 +98,11 @@ static int snd_pcm_hooks_close(snd_pcm_t *pcm)
snd_pcm_hook_remove(hook);
}
}
while (!list_empty(&h->dllist)) {
struct snd_pcm_hook_dllist *dl;
pos = h->dllist.next;
hook_remove_dlobj(list_entry(pos, struct snd_pcm_hook_dllist, list));
}
err = snd_pcm_generic_close(pcm);
if (err < 0)
res = err;
@ -193,6 +225,7 @@ int snd_pcm_hooks_open(snd_pcm_t **pcmp, const char *name, snd_pcm_t *slave, int
for (k = 0; k <= SND_PCM_HOOK_TYPE_LAST; ++k) {
INIT_LIST_HEAD(&h->hooks[k]);
}
INIT_LIST_HEAD(&h->dllist);
err = snd_pcm_new(&pcm, SND_PCM_TYPE_HOOKS, name, slave->stream, slave->mode);
if (err < 0) {
free(h);
@ -312,6 +345,8 @@ static int snd_pcm_hook_add_conf(snd_pcm_t *pcm, snd_config_t *root, snd_config_
snd_config_iterator_t i, next;
int (*install_func)(snd_pcm_t *pcm, snd_config_t *args) = NULL;
void *h = NULL;
struct snd_pcm_hook_dllist *dl;
if (snd_config_get_type(conf) != SND_CONFIG_TYPE_COMPOUND) {
SNDERR("Invalid hook definition");
return -EINVAL;
@ -402,20 +437,26 @@ static int snd_pcm_hook_add_conf(snd_pcm_t *pcm, snd_config_t *root, snd_config_
_err:
if (type)
snd_config_delete(type);
if (err >= 0) {
if (args && snd_config_get_string(args, &str) >= 0) {
err = snd_config_search_definition(root, "hook_args", str, &args);
if (err < 0)
SNDERR("unknown hook_args %s", str);
else
err = install_func(pcm, args);
snd_config_delete(args);
} else
err = install_func(pcm, args);
snd_dlclose(h);
}
if (err < 0)
return err;
if (args && snd_config_get_string(args, &str) >= 0) {
err = snd_config_search_definition(root, "hook_args", str, &args);
if (err < 0)
SNDERR("unknown hook_args %s", str);
else
err = install_func(pcm, args);
snd_config_delete(args);
} else
err = install_func(pcm, args);
if (err >= 0)
err = hook_add_dlobj(pcm, h);
if (err < 0) {
snd_dlclose(h);
return err;
}
return 0;
}