source4/lib/events/tevent_s4.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Copyright (C) Andrew Tridgell 2003
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include "includes.h"
  20 #define TEVENT_DEPRECATED 1
  21 #include "lib/events/events.h"
  22
  23 /*
  24   this is used to catch debug messages from events
  25 */
  26 static void ev_wrap_debug(void *context, enum tevent_debug_level level,
  27                           const char *fmt, va_list ap)  PRINTF_ATTRIBUTE(3,0);
  28
  29 static void ev_wrap_debug(void *context, enum tevent_debug_level level,
  30                           const char *fmt, va_list ap)
  31 {
  32         int samba_level = -1;
  33         char *s = NULL;
  34         switch (level) {
  35         case TEVENT_DEBUG_FATAL:
  36                 samba_level = 0;
  37                 break;
  38         case TEVENT_DEBUG_ERROR:
  39                 samba_level = 1;
  40                 break;
  41         case TEVENT_DEBUG_WARNING:
  42                 samba_level = 2;
  43                 break;
  44         case TEVENT_DEBUG_TRACE:
  45                 samba_level = 50;
  46                 break;
  47
  48         };
  49         vasprintf(&s, fmt, ap);
  50         if (!s) return;
  51         DEBUG(samba_level, ("tevent: %s", s));
  52         free(s);
  53 }
  54
  55 /*
  56   create a event_context structure. This must be the first events
  57   call, and all subsequent calls pass this event_context as the first
  58   element. Event handlers also receive this as their first argument.
  59
  60   This samba4 specific call sets the samba4 debug handler.
  61 */
  62 struct tevent_context *s4_event_context_init(TALLOC_CTX *mem_ctx)
  63 {
  64         struct tevent_context *ev;
  65
  66         ev = tevent_context_init_byname(mem_ctx, NULL);
  67         if (ev) {
  68                 tevent_set_debug(ev, ev_wrap_debug, NULL);
  69                 tevent_loop_allow_nesting(ev);
  70         }
  71         return ev;
  72 }
  73
  74 static struct tevent_context *default_tevent_context;
  75
  76 /* set a default event context that will be used for
  77  * event_context_find() if a parent event context is not found
  78  */
  79 void s4_event_context_set_default(struct tevent_context *ev)
  80 {
  81         default_tevent_context = ev;
  82 }
  83
  84 /*
  85   find an event context that is a parent of the given memory context,
  86   or create a new event context as a child of the given context if
  87   none is found
  88
  89   This should be used in preference to event_context_init() in places
  90   where you would prefer to use the existing event context if possible
  91   (which is most situations)
  92 */
  93 struct tevent_context *event_context_find(TALLOC_CTX *mem_ctx)
  94 {
  95         struct tevent_context *ev = talloc_find_parent_bytype(mem_ctx, struct tevent_context);
  96         if (ev == NULL) {
  97                 ev = default_tevent_context;
  98         }
  99         if (ev == NULL) {
 100                 ev = tevent_context_init(mem_ctx);
 101         }
 102         return ev;
 103 }