lib/hook.c

   1 /*
   2  * Copyright (c) 2016  David Lamparter, for NetDEF, Inc.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include "memory.h"
  22 #include "hook.h"
  23
  24 DEFINE_MTYPE_STATIC(LIB, HOOK_ENTRY, "Hook entry")
  25
  26 void _hook_register(struct hook *hook, void *funcptr, void *arg, bool has_arg,
  27                     struct frrmod_runtime *module, const char *funcname,
  28                     int priority)
  29 {
  30         struct hookent *he = XCALLOC(MTYPE_HOOK_ENTRY, sizeof(*he)), **pos;
  31         he->hookfn = funcptr;
  32         he->hookarg = arg;
  33         he->has_arg = has_arg;
  34         he->module = module;
  35         he->fnname = funcname;
  36         he->priority = priority;
  37
  38         for (pos = &hook->entries; *pos; pos = &(*pos)->next)
  39                 if (hook->reverse ? (*pos)->priority < priority
  40                                   : (*pos)->priority >= priority)
  41                         break;
  42
  43         he->next = *pos;
  44         *pos = he;
  45 }
  46
  47 void _hook_unregister(struct hook *hook, void *funcptr, void *arg, bool has_arg)
  48 {
  49         struct hookent *he, **prev;
  50
  51         for (prev = &hook->entries; (he = *prev) != NULL; prev = &he->next)
  52                 if (he->hookfn == funcptr && he->hookarg == arg
  53                     && he->has_arg == has_arg) {
  54                         *prev = he->next;
  55                         XFREE(MTYPE_HOOK_ENTRY, he);
  56                         break;
  57                 }
  58 }