code.delx.au - pulseaudio/blob - src/pulsecore/modinfo.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as
  10   published by the Free Software Foundation; either version 2 of the
  11   License, or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public
  19   License along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <ltdl.h>
  29 #include <assert.h>
  30
  31 #include <pulse/xmalloc.h>
  32
  33 #include <pulsecore/core-util.h>
  34 #include <pulsecore/log.h>
  35
  36 #include "modinfo.h"
  37
  38 #define PA_SYMBOL_AUTHOR "pa__get_author"
  39 #define PA_SYMBOL_DESCRIPTION "pa__get_description"
  40 #define PA_SYMBOL_USAGE "pa__get_usage"
  41 #define PA_SYMBOL_VERSION "pa__get_version"
  42
  43 /* lt_dlsym() violates ISO C, so confide the breakage into this function to
  44  * avoid warnings. */
  45 typedef void (*fnptr)(void);
  46 static inline fnptr lt_dlsym_fn(lt_dlhandle handle, const char *symbol) {
  47     return (fnptr) (long) lt_dlsym(handle, symbol);
  48 }
  49
  50 pa_modinfo *pa_modinfo_get_by_handle(lt_dlhandle dl) {
  51     pa_modinfo *i;
  52     const char* (*func)(void);
  53     assert(dl);
  54
  55     i = pa_xnew0(pa_modinfo, 1);
  56
  57     if ((func = (const char* (*)(void)) lt_dlsym_fn(dl, PA_SYMBOL_AUTHOR)))
  58         i->author = pa_xstrdup(func());
  59
  60     if ((func = (const char* (*)(void)) lt_dlsym_fn(dl, PA_SYMBOL_DESCRIPTION)))
  61         i->description = pa_xstrdup(func());
  62
  63     if ((func = (const char* (*)(void)) lt_dlsym_fn(dl, PA_SYMBOL_USAGE)))
  64         i->usage = pa_xstrdup(func());
  65
  66     if ((func = (const char* (*)(void)) lt_dlsym_fn(dl, PA_SYMBOL_VERSION)))
  67         i->version = pa_xstrdup(func());
  68
  69     return i;
  70 }
  71
  72 pa_modinfo *pa_modinfo_get_by_name(const char *name) {
  73     lt_dlhandle dl;
  74     pa_modinfo *i;
  75     assert(name);
  76
  77     if (!(dl = lt_dlopenext(name))) {
  78         pa_log("Failed to open module \"%s\": %s", name, lt_dlerror());
  79         return NULL;
  80     }
  81
  82     i = pa_modinfo_get_by_handle(dl);
  83     lt_dlclose(dl);
  84
  85     return i;
  86 }
  87
  88 void pa_modinfo_free(pa_modinfo *i) {
  89     assert(i);
  90     pa_xfree(i->author);
  91     pa_xfree(i->description);
  92     pa_xfree(i->usage);
  93     pa_xfree(i->version);
  94     pa_xfree(i);
  95 }