code.delx.au - pulseaudio/blob - src/module.c

   1 #include <limits.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <assert.h>
   5 #include <string.h>
   6 #include <errno.h>
   7
   8 #include "module.h"
   9 #include "strbuf.h"
  10
  11 struct pa_module* pa_module_load(struct pa_core *c, const char *name, const char *argument) {
  12     struct pa_module *m = NULL;
  13     int r;
  14
  15     assert(c && name);
  16
  17     m = malloc(sizeof(struct pa_module));
  18     assert(m);
  19
  20     m->name = strdup(name);
  21     m->argument = argument ? strdup(argument) : NULL;
  22
  23     if (!(m->dl = lt_dlopenext(name)))
  24         goto fail;
  25
  26     if (!(m->init = lt_dlsym(m->dl, "pa_module_init")))
  27         goto fail;
  28
  29     if (!(m->done = lt_dlsym(m->dl, "pa_module_done")))
  30         goto fail;
  31
  32     m->userdata = NULL;
  33     m->core = c;
  34
  35     assert(m->init);
  36     if (m->init(c, m) < 0)
  37         goto fail;
  38
  39     if (!c->modules)
  40         c->modules = pa_idxset_new(NULL, NULL);
  41
  42     assert(c->modules);
  43     r = pa_idxset_put(c->modules, m, &m->index);
  44     assert(r >= 0 && m->index != PA_IDXSET_INVALID);
  45
  46     fprintf(stderr, "module: loaded %u \"%s\" with argument \"%s\".\n", m->index, m->name, m->argument);
  47
  48     return m;
  49
  50 fail:
  51     if (m) {
  52         free(m->argument);
  53         free(m->name);
  54
  55         if (m->dl)
  56             lt_dlclose(m->dl);
  57
  58         free(m);
  59     }
  60
  61     return NULL;
  62 }
  63
  64 static void pa_module_free(struct pa_module *m) {
  65     assert(m && m->done && m->core);
  66     m->done(m->core, m);
  67
  68     lt_dlclose(m->dl);
  69
  70     fprintf(stderr, "module: unloaded %u \"%s\".\n", m->index, m->name);
  71
  72     free(m->name);
  73     free(m->argument);
  74     free(m);
  75 }
  76
  77
  78 void pa_module_unload(struct pa_core *c, struct pa_module *m) {
  79     assert(c && m);
  80
  81     assert(c->modules);
  82     if (!(m = pa_idxset_remove_by_data(c->modules, m, NULL)))
  83         return;
  84
  85     pa_module_free(m);
  86 }
  87
  88 void pa_module_unload_by_index(struct pa_core *c, uint32_t index) {
  89     struct pa_module *m;
  90     assert(c && index != PA_IDXSET_INVALID);
  91
  92     assert(c->modules);
  93     if (!(m = pa_idxset_remove_by_index(c->modules, index)))
  94         return;
  95
  96     pa_module_free(m);
  97 }
  98
  99 static void free_callback(void *p, void *userdata) {
 100     struct pa_module *m = p;
 101     assert(m);
 102     pa_module_free(m);
 103 }
 104
 105 void pa_module_unload_all(struct pa_core *c) {
 106     assert(c);
 107
 108     if (!c->modules)
 109         return;
 110
 111     pa_idxset_free(c->modules, free_callback, NULL);
 112     c->modules = NULL;
 113 }
 114
 115 char *pa_module_list_to_string(struct pa_core *c) {
 116     struct pa_strbuf *s;
 117     struct pa_module *m;
 118     uint32_t index = PA_IDXSET_INVALID;
 119     assert(c);
 120
 121     s = pa_strbuf_new();
 122     assert(s);
 123
 124     pa_strbuf_printf(s, "%u module(s) loaded.\n", pa_idxset_ncontents(c->modules));
 125
 126     for (m = pa_idxset_first(c->modules, &index); m; m = pa_idxset_next(c->modules, &index))
 127         pa_strbuf_printf(s, "    index: %u\n\tname: <%s>\n\targument: <%s>\n", m->index, m->name, m->argument);
 128
 129     return pa_strbuf_tostring_free(s);
 130 }
 131
 132
 133 struct once_info {
 134     struct pa_core *core;
 135     uint32_t index;
 136 };
 137
 138
 139 static void module_unload_once_callback(void *userdata) {
 140     struct once_info *i = userdata;
 141     assert(i);
 142     pa_module_unload_by_index(i->core, i->index);
 143     free(i);
 144 }
 145
 146 void pa_module_unload_request(struct pa_core *c, struct pa_module *m) {
 147     struct once_info *i;
 148     assert(c && m);
 149
 150     i = malloc(sizeof(struct once_info));
 151     assert(i);
 152     i->core = c;
 153     i->index = m->index;
 154     pa_mainloop_api_once(c->mainloop, module_unload_once_callback, i);
 155 }