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 #include <fcntl.h>
  34
  35 #include <pulse/xmalloc.h>
  36 #include <pulsecore/module.h>
  37 #include <pulsecore/core.h>
  38 #include <pulsecore/llist.h>
  39 #include <pulsecore/core-util.h>
  40 #include <pulsecore/log.h>
  41 #include <pulse/mainloop-api.h>
  42 #include <pulsecore/core-error.h>
  43 #include <pulsecore/start-child.h>
  44
  45 #include "module-gconf-symdef.h"
  46
  47 PA_MODULE_AUTHOR("Lennart Poettering");
  48 PA_MODULE_DESCRIPTION("GConf Adapter");
  49 PA_MODULE_VERSION(PACKAGE_VERSION);
  50 PA_MODULE_LOAD_ONCE(TRUE);
  51
  52 #define MAX_MODULES 10
  53 #define BUF_MAX 2048
  54
  55 struct module_item {
  56     char *name;
  57     char *args;
  58     uint32_t index;
  59 };
  60
  61 struct module_info {
  62     char *name;
  63
  64     struct module_item items[MAX_MODULES];
  65     unsigned n_items;
  66 };
  67
  68 struct userdata {
  69     pa_core *core;
  70     pa_module *module;
  71
  72     pa_hashmap *module_infos;
  73
  74     pid_t pid;
  75
  76     int fd;
  77     int fd_type;
  78     pa_io_event *io_event;
  79
  80     char buf[BUF_MAX];
  81     size_t buf_fill;
  82 };
  83
  84 static int fill_buf(struct userdata *u) {
  85     ssize_t r;
  86     pa_assert(u);
  87
  88     if (u->buf_fill >= BUF_MAX) {
  89         pa_log("read buffer overflow");
  90         return -1;
  91     }
  92
  93     if ((r = pa_read(u->fd, u->buf + u->buf_fill, BUF_MAX - u->buf_fill, &u->fd_type)) <= 0)
  94         return -1;
  95
  96     u->buf_fill += (size_t) r;
  97     return 0;
  98 }
  99
 100 static int read_byte(struct userdata *u) {
 101     int ret;
 102     pa_assert(u);
 103
 104     if (u->buf_fill < 1)
 105         if (fill_buf(u) < 0)
 106             return -1;
 107
 108     ret = u->buf[0];
 109     pa_assert(u->buf_fill > 0);
 110     u->buf_fill--;
 111     memmove(u->buf, u->buf+1, u->buf_fill);
 112     return ret;
 113 }
 114
 115 static char *read_string(struct userdata *u) {
 116     pa_assert(u);
 117
 118     for (;;) {
 119         char *e;
 120
 121         if ((e = memchr(u->buf, 0, u->buf_fill))) {
 122             char *ret = pa_xstrdup(u->buf);
 123             u->buf_fill -= (size_t) (e - u->buf +1);
 124             memmove(u->buf, e+1, u->buf_fill);
 125             return ret;
 126         }
 127
 128         if (fill_buf(u) < 0)
 129             return NULL;
 130     }
 131 }
 132
 133 static void unload_one_module(struct userdata *u, struct module_info*m, unsigned i) {
 134     pa_assert(u);
 135     pa_assert(m);
 136     pa_assert(i < m->n_items);
 137
 138     if (m->items[i].index == PA_INVALID_INDEX)
 139         return;
 140
 141     pa_log_debug("Unloading module #%i", m->items[i].index);
 142     pa_module_unload_by_index(u->core, m->items[i].index, TRUE);
 143     m->items[i].index = PA_INVALID_INDEX;
 144     pa_xfree(m->items[i].name);
 145     pa_xfree(m->items[i].args);
 146     m->items[i].name = m->items[i].args = NULL;
 147 }
 148
 149 static void unload_all_modules(struct userdata *u, struct module_info*m) {
 150     unsigned i;
 151
 152     pa_assert(u);
 153     pa_assert(m);
 154
 155     for (i = 0; i < m->n_items; i++)
 156         unload_one_module(u, m, i);
 157
 158     m->n_items = 0;
 159 }
 160
 161 static void load_module(
 162         struct userdata *u,
 163         struct module_info *m,
 164         unsigned i,
 165         const char *name,
 166         const char *args,
 167         pa_bool_t is_new) {
 168
 169     pa_module *mod;
 170
 171     pa_assert(u);
 172     pa_assert(m);
 173     pa_assert(name);
 174     pa_assert(args);
 175
 176     if (!is_new) {
 177         if (m->items[i].index != PA_INVALID_INDEX &&
 178             strcmp(m->items[i].name, name) == 0 &&
 179             strcmp(m->items[i].args, args) == 0)
 180             return;
 181
 182         unload_one_module(u, m, i);
 183     }
 184
 185     pa_log_debug("Loading module '%s' with args '%s' due to GConf configuration.", name, args);
 186
 187     m->items[i].name = pa_xstrdup(name);
 188     m->items[i].args = pa_xstrdup(args);
 189     m->items[i].index = PA_INVALID_INDEX;
 190
 191     if (!(mod = pa_module_load(u->core, name, args))) {
 192         pa_log("pa_module_load() failed");
 193         return;
 194     }
 195
 196     m->items[i].index = mod->index;
 197 }
 198
 199 static void module_info_free(void *p, void *userdata) {
 200     struct module_info *m = p;
 201     struct userdata *u = userdata;
 202
 203     pa_assert(m);
 204     pa_assert(u);
 205
 206     unload_all_modules(u, m);
 207     pa_xfree(m->name);
 208     pa_xfree(m);
 209 }
 210
 211 static int handle_event(struct userdata *u) {
 212     int opcode;
 213     int ret = 0;
 214
 215     do {
 216         if ((opcode = read_byte(u)) < 0){
 217             if (errno == EINTR || errno == EAGAIN)
 218                 break;
 219             goto fail;
 220         }
 221
 222         switch (opcode) {
 223             case '!':
 224                 /* The helper tool is now initialized */
 225                 ret = 1;
 226                 break;
 227
 228             case '+': {
 229                 char *name;
 230                 struct module_info *m;
 231                 unsigned i, j;
 232
 233                 if (!(name = read_string(u)))
 234                     goto fail;
 235
 236                 if (!(m = pa_hashmap_get(u->module_infos, name))) {
 237                     m = pa_xnew(struct module_info, 1);
 238                     m->name = name;
 239                     m->n_items = 0;
 240                     pa_hashmap_put(u->module_infos, m->name, m);
 241                 } else
 242                     pa_xfree(name);
 243
 244                 i = 0;
 245                 while (i < MAX_MODULES) {
 246                     char *module, *args;
 247
 248                     if (!(module = read_string(u))) {
 249                         if (i > m->n_items) m->n_items = i;
 250                         goto fail;
 251                     }
 252
 253                     if (!*module) {
 254                         pa_xfree(module);
 255                         break;
 256                     }
 257
 258                     if (!(args = read_string(u))) {
 259                         pa_xfree(module);
 260
 261                         if (i > m->n_items) m->n_items = i;
 262                         goto fail;
 263                     }
 264
 265                     load_module(u, m, i, module, args, i >= m->n_items);
 266
 267                     i++;
 268
 269                     pa_xfree(module);
 270                     pa_xfree(args);
 271                 }
 272
 273                 /* Unload all removed modules */
 274                 for (j = i; j < m->n_items; j++)
 275                     unload_one_module(u, m, j);
 276
 277                 m->n_items = i;
 278
 279                 break;
 280             }
 281
 282             case '-': {
 283                 char *name;
 284                 struct module_info *m;
 285
 286                 if (!(name = read_string(u)))
 287                     goto fail;
 288
 289                 if ((m = pa_hashmap_get(u->module_infos, name))) {
 290                     pa_hashmap_remove(u->module_infos, name);
 291                     module_info_free(m, u);
 292                 }
 293
 294                 pa_xfree(name);
 295
 296                 break;
 297             }
 298         }
 299     } while (u->buf_fill > 0 && ret == 0);
 300
 301     return ret;
 302
 303 fail:
 304     pa_log("Unable to read or parse data from client.");
 305     return -1;
 306 }
 307
 308 static void io_event_cb(
 309         pa_mainloop_api*a,
 310         pa_io_event* e,
 311         int fd,
 312         pa_io_event_flags_t events,
 313         void *userdata) {
 314
 315     struct userdata *u = userdata;
 316
 317     if (handle_event(u) < 0) {
 318
 319         if (u->io_event) {
 320             u->core->mainloop->io_free(u->io_event);
 321             u->io_event = NULL;
 322         }
 323
 324         pa_module_unload_request(u->module, TRUE);
 325     }
 326 }
 327
 328 int pa__init(pa_module*m) {
 329     struct userdata *u;
 330     int r;
 331
 332     u = pa_xnew(struct userdata, 1);
 333     u->core = m->core;
 334     u->module = m;
 335     m->userdata = u;
 336     u->module_infos = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 337     u->pid = (pid_t) -1;
 338     u->fd = -1;
 339     u->fd_type = 0;
 340     u->io_event = NULL;
 341     u->buf_fill = 0;
 342
 343     if ((u->fd = pa_start_child_for_read(
 344 #if defined(__linux__) && !defined(__OPTIMIZE__)
 345                               pa_run_from_build_tree() ? PA_BUILDDIR "/.libs/gconf-helper" :
 346 #endif
 347                  PA_GCONF_HELPER, NULL, &u->pid)) < 0)
 348         goto fail;
 349
 350     u->io_event = m->core->mainloop->io_new(
 351             m->core->mainloop,
 352             u->fd,
 353             PA_IO_EVENT_INPUT,
 354             io_event_cb,
 355             u);
 356
 357     do {
 358         if ((r = handle_event(u)) < 0)
 359             goto fail;
 360
 361         /* Read until the client signalled us that it is ready with
 362          * initialization */
 363     } while (r != 1);
 364
 365     return 0;
 366
 367 fail:
 368     pa__done(m);
 369     return -1;
 370 }
 371
 372 void pa__done(pa_module*m) {
 373     struct userdata *u;
 374
 375     pa_assert(m);
 376
 377     if (!(u = m->userdata))
 378         return;
 379
 380     if (u->pid != (pid_t) -1) {
 381         kill(u->pid, SIGTERM);
 382
 383         for (;;) {
 384             if (waitpid(u->pid, NULL, 0) >= 0)
 385                 break;
 386
 387             if (errno != EINTR) {
 388                 pa_log("waitpid() failed: %s", pa_cstrerror(errno));
 389                 break;
 390             }
 391         }
 392     }
 393
 394     if (u->io_event)
 395         m->core->mainloop->io_free(u->io_event);
 396
 397     if (u->fd >= 0)
 398         pa_close(u->fd);
 399
 400     if (u->module_infos)
 401         pa_hashmap_free(u->module_infos, module_info_free, u);
 402
 403     pa_xfree(u);
 404 }