src/misc/probe.c

   1 /*****************************************************************************
   2  * probe.c : run-time service listing
   3  *****************************************************************************
   4  * Copyright © 2009 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include "config.h"
  23 #endif
  24
  25 #include <vlc_common.h>
  26 #include <vlc_probe.h>
  27 #include <vlc_modules.h>
  28 #include "libvlc.h"
  29
  30 #undef vlc_probe
  31 void *vlc_probe (vlc_object_t *obj,
  32                  const char *capability, size_t *restrict pcount)
  33 {
  34     vlc_probe_t *probe = vlc_custom_create (obj, sizeof(*probe),
  35                                             VLC_OBJECT_GENERIC, "probe");
  36     if (unlikely(probe == NULL))
  37     {
  38         *pcount = 0;
  39         return NULL;
  40     }
  41     vlc_object_attach (probe, obj);
  42     probe->list = NULL;
  43     probe->count = 0;
  44
  45     module_t *mod = module_need (probe, capability, NULL, false);
  46     if (mod != NULL)
  47     {
  48         msg_Warn (probe, "probing halted");
  49         module_unneed (probe, mod);
  50     }
  51
  52     void *ret = probe->list;
  53     *pcount = probe->count;
  54     vlc_object_release (probe);
  55     return ret;
  56 }