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 userdata *u, struct module_info*m, unsigned i) {
 135     pa_assert(u);
 136     pa_assert(m);
 137     pa_assert(i < m->n_items);
 138
 139     if (m->items[i].index == PA_INVALID_INDEX)
 140         return;
 141
 142     pa_log_debug("Unloading module #%i", m->items[i].index);
 143     pa_module_unload_by_index(u->core, m->items[i].index, TRUE);
 144     m->items[i].index = PA_INVALID_INDEX;
 145     pa_xfree(m->items[i].name);
 146     pa_xfree(m->items[i].args);
 147     m->items[i].name = m->items[i].args = NULL;
 148 }
 149
 150 static void unload_all_modules(struct userdata *u, struct module_info*m) {
 151     unsigned i;
 152
 153     pa_assert(u);
 154     pa_assert(m);
 155
 156     for (i = 0; i < m->n_items; i++)
 157         unload_one_module(u, m, i);
 158
 159     m->n_items = 0;
 160 }
 161
 162 static void load_module(
 163         struct userdata *u,
 164         struct module_info *m,
 165         unsigned i,
 166         const char *name,
 167         const char *args,
 168         pa_bool_t is_new) {
 169
 170     pa_module *mod;
 171
 172     pa_assert(u);
 173     pa_assert(m);
 174     pa_assert(name);
 175     pa_assert(args);
 176
 177     if (!is_new) {
 178         if (m->items[i].index != PA_INVALID_INDEX &&
 179             pa_streq(m->items[i].name, name) &&
 180             pa_streq(m->items[i].args, args))
 181             return;
 182
 183         unload_one_module(u, m, i);
 184     }
 185
 186     pa_log_debug("Loading module '%s' with args '%s' due to GConf configuration.", name, args);
 187
 188     m->items[i].name = pa_xstrdup(name);
 189     m->items[i].args = pa_xstrdup(args);
 190     m->items[i].index = PA_INVALID_INDEX;
 191
 192     if (!(mod = pa_module_load(u->core, name, args))) {
 193         pa_log("pa_module_load() failed");
 194         return;
 195     }
 196
 197     m->items[i].index = mod->index;
 198 }
 199
 200 static void module_info_free(void *p, void *userdata) {
 201     struct module_info *m = p;
 202     struct userdata *u = userdata;
 203
 204     pa_assert(m);
 205     pa_assert(u);
 206
 207     unload_all_modules(u, m);
 208     pa_xfree(m->name);
 209     pa_xfree(m);
 210 }
 211
 212 static int handle_event(struct userdata *u) {
 213     int opcode;
 214     int ret = 0;
 215
 216     do {
 217         if ((opcode = read_byte(u)) < 0){
 218             if (errno == EINTR || errno == EAGAIN)
 219                 break;
 220             goto fail;
 221         }
 222
 223         switch (opcode) {
 224             case '!':
 225                 /* The helper tool is now initialized */
 226                 ret = 1;
 227                 break;
 228
 229             case '+': {
 230                 char *name;
 231                 struct module_info *m;
 232                 unsigned i, j;
 233
 234                 if (!(name = read_string(u)))
 235                     goto fail;
 236
 237                 if (!(m = pa_hashmap_get(u->module_infos, name))) {
 238                     m = pa_xnew(struct module_info, 1);
 239                     m->userdata = u;
 240                     m->name = name;
 241                     m->n_items = 0;
 242                     pa_hashmap_put(u->module_infos, m->name, m);
 243                 } else
 244                     pa_xfree(name);
 245
 246                 i = 0;
 247                 while (i < MAX_MODULES) {
 248                     char *module, *args;
 249
 250                     if (!(module = read_string(u))) {
 251                         if (i > m->n_items) m->n_items = i;
 252                         goto fail;
 253                     }
 254
 255                     if (!*module) {
 256                         pa_xfree(module);
 257                         break;
 258                     }
 259
 260                     if (!(args = read_string(u))) {
 261                         pa_xfree(module);
 262
 263                         if (i > m->n_items) m->n_items = i;
 264                         goto fail;
 265                     }
 266
 267                     load_module(u, m, i, module, args, i >= m->n_items);
 268
 269                     i++;
 270
 271                     pa_xfree(module);
 272                     pa_xfree(args);
 273                 }
 274
 275                 /* Unload all removed modules */
 276                 for (j = i; j < m->n_items; j++)
 277                     unload_one_module(u, m, j);
 278
 279                 m->n_items = i;
 280
 281                 break;
 282             }
 283
 284             case '-': {
 285                 char *name;
 286                 struct module_info *m;
 287
 288                 if (!(name = read_string(u)))
 289                     goto fail;
 290
 291                 if ((m = pa_hashmap_get(u->module_infos, name))) {
 292                     pa_hashmap_remove(u->module_infos, name);
 293                     module_info_free(m, u);
 294                 }
 295
 296                 pa_xfree(name);
 297
 298                 break;
 299             }
 300         }
 301     } while (u->buf_fill > 0 && ret == 0);
 302
 303     return ret;
 304
 305 fail:
 306     pa_log("Unable to read or parse data from client.");
 307     return -1;
 308 }
 309
 310 static void io_event_cb(
 311         pa_mainloop_api*a,
 312         pa_io_event* e,
 313         int fd,
 314         pa_io_event_flags_t events,
 315         void *userdata) {
 316
 317     struct userdata *u = userdata;
 318
 319     if (handle_event(u) < 0) {
 320
 321         if (u->io_event) {
 322             u->core->mainloop->io_free(u->io_event);
 323             u->io_event = NULL;
 324         }
 325
 326         pa_module_unload_request(u->module, TRUE);
 327     }
 328 }
 329
 330 int pa__init(pa_module*m) {
 331     struct userdata *u;
 332     int r;
 333
 334     u = pa_xnew(struct userdata, 1);
 335     u->core = m->core;
 336     u->module = m;
 337     m->userdata = u;
 338     u->module_infos = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 339     u->pid = (pid_t) -1;
 340     u->fd = -1;
 341     u->fd_type = 0;
 342     u->io_event = NULL;
 343     u->buf_fill = 0;
 344
 345     if ((u->fd = pa_start_child_for_read(
 346 #if defined(__linux__) && !defined(__OPTIMIZE__)
 347                               pa_run_from_build_tree() ? PA_BUILDDIR "/gconf-helper" :
 348 #endif
 349                  PA_GCONF_HELPER, NULL, &u->pid)) < 0)
 350         goto fail;
 351
 352     u->io_event = m->core->mainloop->io_new(
 353             m->core->mainloop,
 354             u->fd,
 355             PA_IO_EVENT_INPUT,
 356             io_event_cb,
 357             u);
 358
 359     do {
 360         if ((r = handle_event(u)) < 0)
 361             goto fail;
 362
 363         /* Read until the client signalled us that it is ready with
 364          * initialization */
 365     } while (r != 1);
 366
 367     return 0;
 368
 369 fail:
 370     pa__done(m);
 371     return -1;
 372 }
 373
 374 void pa__done(pa_module*m) {
 375     struct userdata *u;
 376
 377     pa_assert(m);
 378
 379     if (!(u = m->userdata))
 380         return;
 381
 382     if (u->pid != (pid_t) -1) {
 383         kill(u->pid, SIGTERM);
 384
 385         for (;;) {
 386             if (waitpid(u->pid, NULL, 0) >= 0)
 387                 break;
 388
 389             if (errno != EINTR) {
 390                 pa_log("waitpid() failed: %s", pa_cstrerror(errno));
 391                 break;
 392             }
 393         }
 394     }
 395
 396     if (u->io_event)
 397         m->core->mainloop->io_free(u->io_event);
 398
 399     if (u->fd >= 0)
 400         pa_close(u->fd);
 401
 402     if (u->module_infos)
 403         pa_hashmap_free(u->module_infos, module_info_free, u);
 404
 405     pa_xfree(u);
 406 }