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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   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 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 <assert.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #include <signal.h>
  32 #include <sys/types.h>
  33 #include <sys/wait.h>
  34
  35 #include <pulsecore/module.h>
  36 #include <pulsecore/core.h>
  37 #include <pulsecore/llist.h>
  38 #include <pulsecore/core-util.h>
  39 #include <pulsecore/log.h>
  40 #include <pulse/mainloop-api.h>
  41 #include <pulse/xmalloc.h>
  42 #include <pulsecore/core-error.h>
  43
  44 #include "module-gconf-symdef.h"
  45
  46 PA_MODULE_AUTHOR("Lennart Poettering")
  47 PA_MODULE_DESCRIPTION("GConf Adapter")
  48 PA_MODULE_VERSION(PACKAGE_VERSION)
  49 PA_MODULE_USAGE("")
  50
  51 #define MAX_MODULES 10
  52 #define BUF_MAX 2048
  53
  54 #undef PA_GCONF_HELPER
  55 #define PA_GCONF_HELPER "/home/lennart/projects/pulseaudio/src/gconf-helper"
  56
  57 struct module_info {
  58     char *name;
  59
  60     unsigned n_indexes;
  61     uint32_t indexes[MAX_MODULES];
  62 };
  63
  64 struct userdata {
  65     pa_core *core;
  66     pa_module *module;
  67
  68     pa_hashmap *module_infos;
  69
  70     pid_t pid;
  71
  72     int fd;
  73     int fd_type;
  74     pa_io_event *io_event;
  75
  76     char buf[BUF_MAX];
  77     size_t buf_fill;
  78 };
  79
  80 static int fill_buf(struct userdata *u) {
  81     ssize_t r;
  82     assert(u);
  83
  84     if (u->buf_fill >= BUF_MAX) {
  85         pa_log(__FILE__": read buffer overflow");
  86         return -1;
  87     }
  88
  89     if ((r = pa_read(u->fd, u->buf + u->buf_fill, BUF_MAX - u->buf_fill, &u->fd_type)) <= 0)
  90         return -1;
  91
  92     u->buf_fill += r;
  93     return 0;
  94 }
  95
  96 static int read_byte(struct userdata *u) {
  97     int ret;
  98     assert(u);
  99
 100     if (u->buf_fill < 1)
 101         if (fill_buf(u) < 0)
 102             return -1;
 103
 104     ret = u->buf[0];
 105     assert(u->buf_fill > 0);
 106     u->buf_fill--;
 107     memmove(u->buf, u->buf+1, u->buf_fill);
 108     return ret;
 109 }
 110
 111 static char *read_string(struct userdata *u) {
 112     assert(u);
 113
 114     for (;;) {
 115         char *e;
 116
 117         if ((e = memchr(u->buf, 0, u->buf_fill))) {
 118             char *ret = pa_xstrdup(u->buf);
 119             u->buf_fill -= e - u->buf +1;
 120             memmove(u->buf, e+1, u->buf_fill);
 121             return ret;
 122         }
 123
 124         if (fill_buf(u) < 0)
 125             return NULL;
 126     }
 127 }
 128
 129 static void unload_modules(struct userdata *u, struct module_info*m) {
 130     unsigned i;
 131
 132     assert(u);
 133     assert(m);
 134
 135     for (i = 0; i < m->n_indexes; i++) {
 136         pa_log_debug(__FILE__": Unloading module #%i", m->indexes[i]);
 137         pa_module_unload_by_index(u->core, m->indexes[i]);
 138     }
 139
 140     m->n_indexes = 0;
 141 }
 142
 143 static void load_module(
 144         struct userdata *u,
 145         struct module_info *m,
 146         const char *module,
 147         const char *args) {
 148
 149     pa_module *mod;
 150
 151     assert(u);
 152     assert(m);
 153     assert(module);
 154
 155     assert(m->n_indexes < MAX_MODULES);
 156
 157     pa_log_debug(__FILE__": Loading module '%s' with args '%s' due to GConf configuration.", module, args);
 158
 159     if (!(mod = pa_module_load(u->core, module, args))) {
 160         pa_log(__FILE__": pa_module_load() failed");
 161         return;
 162     }
 163
 164     m->indexes[m->n_indexes++] = mod->index;
 165 }
 166
 167 static void module_info_free(void *p, void *userdata) {
 168     struct module_info *m = p;
 169     struct userdata *u = userdata;
 170
 171     assert(m);
 172     assert(u);
 173
 174     unload_modules(u, m);
 175     pa_xfree(m->name);
 176     pa_xfree(m);
 177 }
 178
 179 static int handle_event(struct userdata *u) {
 180     int opcode;
 181     int ret = 0;
 182
 183     do {
 184         if ((opcode = read_byte(u)) < 0)
 185             goto fail;
 186
 187         switch (opcode) {
 188             case '!':
 189                 /* The helper tool is now initialized */
 190                 ret = 1;
 191                 break;
 192
 193             case '+': {
 194                 char *name;
 195                 struct module_info *m;
 196
 197                 if (!(name = read_string(u)))
 198                     goto fail;
 199
 200                 if ((m = pa_hashmap_get(u->module_infos, name))) {
 201                     unload_modules(u, m);
 202                 } else {
 203                     m = pa_xnew(struct module_info, 1);
 204                     m->name = pa_xstrdup(name);
 205                     m->n_indexes = 0;
 206                     pa_hashmap_put(u->module_infos, m->name, m);
 207                 }
 208
 209                 while (m->n_indexes < MAX_MODULES) {
 210                     char *module, *args;
 211
 212                     if (!(module = read_string(u))) {
 213                         pa_xfree(name);
 214                         goto fail;
 215                     }
 216
 217                     if (!*module) {
 218                         pa_xfree(module);
 219                         break;
 220                     }
 221
 222                     if (!(args = read_string(u))) {
 223                         pa_xfree(name);
 224                         pa_xfree(module);
 225                         goto fail;
 226                     }
 227
 228                     load_module(u, m, module, args);
 229
 230                     pa_xfree(module);
 231                     pa_xfree(args);
 232                 }
 233
 234                 pa_xfree(name);
 235
 236                 break;
 237             }
 238
 239             case '-': {
 240                 char *name;
 241                 struct module_info *m;
 242
 243                 if (!(name = read_string(u)))
 244                     goto fail;
 245
 246                 if ((m = pa_hashmap_get(u->module_infos, name))) {
 247                     pa_hashmap_remove(u->module_infos, name);
 248                     module_info_free(m, u);
 249                 }
 250
 251                 pa_xfree(name);
 252
 253                 break;
 254             }
 255         }
 256     } while (u->buf_fill > 0 && ret == 0);
 257
 258     return ret;
 259
 260 fail:
 261     pa_log(__FILE__": Unable to read or parse data from client.");
 262     return -1;
 263 }
 264
 265 static void io_event_cb(
 266         pa_mainloop_api*a,
 267         pa_io_event* e,
 268         int fd,
 269         pa_io_event_flags_t events,
 270         void *userdata) {
 271
 272     struct userdata *u = userdata;
 273
 274     handle_event(u);
 275 }
 276
 277 static int start_client(const char *n, pid_t *pid) {
 278     pid_t child;
 279     int pipe_fds[2] = { -1, -1 };
 280
 281     if (pipe(pipe_fds) < 0) {
 282         pa_log(__FILE__": pipe() failed: %s", pa_cstrerror(errno));
 283         goto fail;
 284     }
 285
 286     if ((child = fork()) == (pid_t) -1) {
 287         pa_log(__FILE__": fork() failed: %s", pa_cstrerror(errno));
 288         goto fail;
 289     } else if (child != 0) {
 290
 291         /* Parent */
 292         close(pipe_fds[1]);
 293
 294         if (pid)
 295             *pid = child;
 296
 297         return pipe_fds[0];
 298     } else {
 299
 300         /* child */
 301
 302         close(pipe_fds[0]);
 303         dup2(pipe_fds[1], 1);
 304
 305         if (pipe_fds[1] != 1)
 306             close(pipe_fds[1]);
 307
 308         execl(n, n, NULL);
 309         _exit(1);
 310     }
 311
 312 fail:
 313     if (pipe_fds[0] >= 0)
 314         close(pipe_fds[0]);
 315
 316     if (pipe_fds[1] >= 0)
 317         close(pipe_fds[1]);
 318
 319     return -1;
 320 }
 321
 322 int pa__init(pa_core *c, pa_module*m) {
 323     struct userdata *u;
 324     int r;
 325
 326     u = pa_xnew(struct userdata, 1);
 327     u->core = c;
 328     u->module = m;
 329     u->module_infos = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 330     u->pid = (pid_t) -1;
 331     u->fd = -1;
 332     u->fd_type = 0;
 333     u->io_event = NULL;
 334     u->buf_fill = 0;
 335
 336     if ((u->fd = start_client(PA_GCONF_HELPER, &u->pid)) < 0)
 337         goto fail;
 338
 339     u->io_event = c->mainloop->io_new(
 340             c->mainloop,
 341             u->fd,
 342             PA_IO_EVENT_INPUT,
 343             io_event_cb,
 344             u);
 345
 346     do {
 347         if ((r = handle_event(u)) < 0)
 348             goto fail;
 349
 350         /* Read until the client signalled us that it is ready with
 351          * initialization */
 352     } while (r != 1);
 353
 354     return 0;
 355
 356 fail:
 357     pa__done(c, m);
 358     return -1;
 359 }
 360
 361 void pa__done(pa_core *c, pa_module*m) {
 362     struct userdata *u;
 363
 364     assert(c);
 365     assert(m);
 366
 367     if (!(u = m->userdata))
 368         return;
 369
 370     if (u->io_event)
 371         c->mainloop->io_free(u->io_event);
 372
 373     if (u->fd >= 0)
 374         close(u->fd);
 375
 376     if (u->pid != (pid_t) -1) {
 377         kill(u->pid, SIGTERM);
 378         waitpid(u->pid, NULL, 0);
 379     }
 380
 381     if (u->module_infos)
 382         pa_hashmap_free(u->module_infos, module_info_free, u);
 383
 384     pa_xfree(u);
 385 }
 386