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

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33
  34 #include <pulse/xmalloc.h>
  35 #include <pulsecore/module.h>
  36 #include <pulsecore/core.h>
  37 #include <pulsecore/core-util.h>
  38 #include <pulsecore/log.h>
  39 #include <pulse/mainloop-api.h>
  40 #include <pulsecore/core-error.h>
  41 #include <pulsecore/start-child.h>
  42
  43 #include "module-gconf-symdef.h"
  44
  45 PA_MODULE_AUTHOR("Lennart Poettering");
  46 PA_MODULE_DESCRIPTION("GConf Adapter");
  47 PA_MODULE_VERSION(PACKAGE_VERSION);
  48 PA_MODULE_LOAD_ONCE(true);
  49
  50 #define MAX_MODULES 10
  51 #define BUF_MAX 2048
  52
  53 struct userdata;
  54
  55 struct module_item {
  56     char *name;
  57     char *args;
  58     uint32_t index;
  59 };
  60
  61 struct module_info {
  62     struct userdata *userdata;
  63     char *name;
  64
  65     struct module_item items[MAX_MODULES];
  66     unsigned n_items;
  67 };
  68
  69 struct userdata {
  70     pa_core *core;
  71     pa_module *module;
  72
  73     pa_hashmap *module_infos;
  74
  75     pid_t pid;
  76
  77     int fd;
  78     int fd_type;
  79     pa_io_event *io_event;
  80
  81     char buf[BUF_MAX];
  82     size_t buf_fill;
  83 };
  84
  85 static int fill_buf(struct userdata *u) {
  86     ssize_t r;
  87     pa_assert(u);
  88
  89     if (u->buf_fill >= BUF_MAX) {
  90         pa_log("read buffer overflow");
  91         return -1;
  92     }
  93
  94     if ((r = pa_read(u->fd, u->buf + u->buf_fill, BUF_MAX - u->buf_fill, &u->fd_type)) <= 0)
  95         return -1;
  96
  97     u->buf_fill += (size_t) r;
  98     return 0;
  99 }
 100
 101 static int read_byte(struct userdata *u) {
 102     int ret;
 103     pa_assert(u);
 104
 105     if (u->buf_fill < 1)
 106         if (fill_buf(u) < 0)
 107             return -1;
 108
 109     ret = u->buf[0];
 110     pa_assert(u->buf_fill > 0);
 111     u->buf_fill--;
 112     memmove(u->buf, u->buf+1, u->buf_fill);
 113     return ret;
 114 }
 115
 116 static char *read_string(struct userdata *u) {
 117     pa_assert(u);
 118
 119     for (;;) {
 120         char *e;
 121
 122         if ((e = memchr(u->buf, 0, u->buf_fill))) {
 123             char *ret = pa_xstrdup(u->buf);
 124             u->buf_fill -= (size_t) (e - u->buf +1);
 125             memmove(u->buf, e+1, u->buf_fill);
 126             return ret;
 127         }
 128
 129         if (fill_buf(u) < 0)
 130             return NULL;
 131     }
 132 }
 133
 134 static void unload_one_module(struct module_info *m, unsigned i) {
 135     struct userdata *u;
 136
 137     pa_assert(m);
 138     pa_assert(i < m->n_items);
 139
 140     u = m->userdata;
 141
 142     if (m->items[i].index == PA_INVALID_INDEX)
 143         return;
 144
 145     pa_log_debug("Unloading module #%i", m->items[i].index);
 146     pa_module_unload_by_index(u->core, m->items[i].index, true);
 147     m->items[i].index = PA_INVALID_INDEX;
 148     pa_xfree(m->items[i].name);
 149     pa_xfree(m->items[i].args);
 150     m->items[i].name = m->items[i].args = NULL;
 151 }
 152
 153 static void unload_all_modules(struct module_info *m) {
 154     unsigned i;
 155
 156     pa_assert(m);
 157
 158     for (i = 0; i < m->n_items; i++)
 159         unload_one_module(m, i);
 160
 161     m->n_items = 0;
 162 }
 163
 164 static void load_module(
 165         struct module_info *m,
 166         unsigned i,
 167         const char *name,
 168         const char *args,
 169         bool is_new) {
 170
 171     struct userdata *u;
 172     pa_module *mod;
 173
 174     pa_assert(m);
 175     pa_assert(name);
 176     pa_assert(args);
 177
 178     u = m->userdata;
 179
 180     if (!is_new) {
 181         if (m->items[i].index != PA_INVALID_INDEX &&
 182             pa_streq(m->items[i].name, name) &&
 183             pa_streq(m->items[i].args, args))
 184             return;
 185
 186         unload_one_module(m, i);
 187     }
 188
 189     pa_log_debug("Loading module '%s' with args '%s' due to GConf configuration.", name, args);
 190
 191     m->items[i].name = pa_xstrdup(name);
 192     m->items[i].args = pa_xstrdup(args);
 193     m->items[i].index = PA_INVALID_INDEX;
 194
 195     if (!(mod = pa_module_load(u->core, name, args))) {
 196         pa_log("pa_module_load() failed");
 197         return;
 198     }
 199
 200     m->items[i].index = mod->index;
 201 }
 202
 203 static void module_info_free(void *p) {
 204     struct module_info *m = p;
 205
 206     pa_assert(m);
 207
 208     unload_all_modules(m);
 209     pa_xfree(m->name);
 210     pa_xfree(m);
 211 }
 212
 213 static int handle_event(struct userdata *u) {
 214     int opcode;
 215     int ret = 0;
 216
 217     do {
 218         if ((opcode = read_byte(u)) < 0) {
 219             if (errno == EINTR || errno == EAGAIN)
 220                 break;
 221             goto fail;
 222         }
 223
 224         switch (opcode) {
 225             case '!':
 226                 /* The helper tool is now initialized */
 227                 ret = 1;
 228                 break;
 229
 230             case '+': {
 231                 char *name;
 232                 struct module_info *m;
 233                 unsigned i, j;
 234
 235                 if (!(name = read_string(u)))
 236                     goto fail;
 237
 238                 if (!(m = pa_hashmap_get(u->module_infos, name))) {
 239                     m = pa_xnew(struct module_info, 1);
 240                     m->userdata = u;
 241                     m->name = name;
 242                     m->n_items = 0;
 243                     pa_hashmap_put(u->module_infos, m->name, m);
 244                 } else
 245                     pa_xfree(name);
 246
 247                 i = 0;
 248                 while (i < MAX_MODULES) {
 249                     char *module, *args;
 250
 251                     if (!(module = read_string(u))) {
 252                         if (i > m->n_items) m->n_items = i;
 253                         goto fail;
 254                     }
 255
 256                     if (!*module) {
 257                         pa_xfree(module);
 258                         break;
 259                     }
 260
 261                     if (!(args = read_string(u))) {
 262                         pa_xfree(module);
 263
 264                         if (i > m->n_items) m->n_items = i;
 265                         goto fail;
 266                     }
 267
 268                     load_module(m, i, module, args, i >= m->n_items);
 269
 270                     i++;
 271
 272                     pa_xfree(module);
 273                     pa_xfree(args);
 274                 }
 275
 276                 /* Unload all removed modules */
 277                 for (j = i; j < m->n_items; j++)
 278                     unload_one_module(m, j);
 279
 280                 m->n_items = i;
 281
 282                 break;
 283             }
 284
 285             case '-': {
 286                 char *name;
 287                 struct module_info *m;
 288
 289                 if (!(name = read_string(u)))
 290                     goto fail;
 291
 292                 pa_hashmap_remove_and_free(u->module_infos, name);
 293                 pa_xfree(name);
 294
 295                 break;
 296             }
 297         }
 298     } while (u->buf_fill > 0 && ret == 0);
 299
 300     return ret;
 301
 302 fail:
 303     pa_log("Unable to read or parse data from client.");
 304     return -1;
 305 }
 306
 307 static void io_event_cb(
 308         pa_mainloop_api*a,
 309         pa_io_event* e,
 310         int fd,
 311         pa_io_event_flags_t events,
 312         void *userdata) {
 313
 314     struct userdata *u = userdata;
 315
 316     if (handle_event(u) < 0) {
 317
 318         if (u->io_event) {
 319             u->core->mainloop->io_free(u->io_event);
 320             u->io_event = NULL;
 321         }
 322
 323         pa_module_unload_request(u->module, true);
 324     }
 325 }
 326
 327 int pa__init(pa_module*m) {
 328     struct userdata *u;
 329     int r;
 330
 331     u = pa_xnew(struct userdata, 1);
 332     u->core = m->core;
 333     u->module = m;
 334     m->userdata = u;
 335     u->module_infos = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) module_info_free);
 336     u->pid = (pid_t) -1;
 337     u->fd = -1;
 338     u->fd_type = 0;
 339     u->io_event = NULL;
 340     u->buf_fill = 0;
 341
 342     if ((u->fd = pa_start_child_for_read(
 343 #if defined(__linux__) && !defined(__OPTIMIZE__)
 344                               pa_run_from_build_tree() ? PA_BUILDDIR "/gconf-helper" :
 345 #endif
 346                  PA_GCONF_HELPER, NULL, &u->pid)) < 0)
 347         goto fail;
 348
 349     u->io_event = m->core->mainloop->io_new(
 350             m->core->mainloop,
 351             u->fd,
 352             PA_IO_EVENT_INPUT,
 353             io_event_cb,
 354             u);
 355
 356     do {
 357         if ((r = handle_event(u)) < 0)
 358             goto fail;
 359
 360         /* Read until the client signalled us that it is ready with
 361          * initialization */
 362     } while (r != 1);
 363
 364     return 0;
 365
 366 fail:
 367     pa__done(m);
 368     return -1;
 369 }
 370
 371 void pa__done(pa_module*m) {
 372     struct userdata *u;
 373
 374     pa_assert(m);
 375
 376     if (!(u = m->userdata))
 377         return;
 378
 379     if (u->pid != (pid_t) -1) {
 380         kill(u->pid, SIGTERM);
 381
 382         for (;;) {
 383             if (waitpid(u->pid, NULL, 0) >= 0)
 384                 break;
 385
 386             if (errno != EINTR) {
 387                 pa_log("waitpid() failed: %s", pa_cstrerror(errno));
 388                 break;
 389             }
 390         }
 391     }
 392
 393     if (u->io_event)
 394         m->core->mainloop->io_free(u->io_event);
 395
 396     if (u->fd >= 0)
 397         pa_close(u->fd);
 398
 399     if (u->module_infos)
 400         pa_hashmap_free(u->module_infos);
 401
 402     pa_xfree(u);
 403 }