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