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 "libvlc.h"
  28
  29 #undef vlc_probe
  30 void *vlc_probe (vlc_object_t *obj,
  31                  const char *capability, size_t *restrict pcount)
  32 {
  33     vlc_probe_t *probe = vlc_custom_create (obj, sizeof(*probe),
  34                                             VLC_OBJECT_GENERIC, "probe");
  35     if (unlikely(probe == NULL))
  36     {
  37         *pcount = 0;
  38         return NULL;
  39     }
  40     vlc_object_attach (probe, obj);
  41     probe->list = NULL;
  42     probe->count = 0;
  43
  44     module_t *mod = module_need (probe, capability, NULL, false);
  45     if (mod != NULL)
  46     {
  47         msg_Warn (probe, "probing halted");
  48         module_unneed (probe, mod);
  49     }
  50
  51     void *ret = probe->list;
  52     *pcount = probe->count;
  53     vlc_object_release (probe);
  54     return ret;
  55 }