lib/hook.c

   1 /*
   2  * Copyright (c) 2016  David Lamparter, for NetDEF, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20  * DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 #include "memory.h"
  24 #include "hook.h"
  25
  26 DEFINE_MTYPE_STATIC(LIB, HOOK_ENTRY, "Hook entry")
  27
  28 void _hook_register(struct hook *hook, void *funcptr, void *arg, bool has_arg,
  29                     struct frrmod_runtime *module, const char *funcname,
  30                     int priority)
  31 {
  32         struct hookent *he = XCALLOC(MTYPE_HOOK_ENTRY, sizeof(*he)), **pos;
  33         he->hookfn = funcptr;
  34         he->hookarg = arg;
  35         he->has_arg = has_arg;
  36         he->module = module;
  37         he->fnname = funcname;
  38         he->priority = priority;
  39
  40         for (pos = &hook->entries; *pos; pos = &(*pos)->next)
  41                 if (hook->reverse ? (*pos)->priority < priority
  42                                   : (*pos)->priority >= priority)
  43                         break;
  44
  45         he->next = *pos;
  46         *pos = he;
  47 }
  48
  49 void _hook_unregister(struct hook *hook, void *funcptr, void *arg, bool has_arg)
  50 {
  51         struct hookent *he, **prev;
  52
  53         for (prev = &hook->entries; (he = *prev) != NULL; prev = &he->next)
  54                 if (he->hookfn == funcptr && he->hookarg == arg
  55                     && he->has_arg == has_arg) {
  56                         *prev = he->next;
  57                         XFREE(MTYPE_HOOK_ENTRY, he);
  58                         break;
  59                 }
  60 }