common/signal.h

   1 /*
   2  * common/signal.h - Signal handling functions
   3  *
   4  * Copyright © 2009 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 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 General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #ifndef AWESOME_COMMON_SIGNAL
  23 #define AWESOME_COMMON_SIGNAL
  24
  25 #include "common/lualib.h"
  26 #include "common/array.h"
  27
  28 DO_ARRAY(const void *, cptr, DO_NOTHING)
  29
  30 typedef struct
  31 {
  32     unsigned long id;
  33     cptr_array_t sigfuncs;
  34 } signal_t;
  35
  36 static inline int
  37 signal_cmp(const void *a, const void *b)
  38 {
  39     const signal_t *x = a, *y = b;
  40     return x->id > y->id ? 1 : (x->id < y->id ? -1 : 0);
  41 }
  42
  43 static inline void
  44 signal_wipe(signal_t *sig)
  45 {
  46     cptr_array_wipe(&sig->sigfuncs);
  47 }
  48
  49 DO_BARRAY(signal_t, signal, signal_wipe, signal_cmp)
  50
  51 static inline signal_t *
  52 signal_array_getbyid(signal_array_t *arr, unsigned long id)
  53 {
  54     signal_t sig = { .id = id };
  55     return signal_array_lookup(arr, &sig);
  56 }
  57
  58 /** Add a signal inside a signal array.
  59  * You are in charge of reference counting.
  60  * \param arr The signal array.
  61  * \param name The signal name.
  62  * \param ref The reference to add.
  63  */
  64 static inline void
  65 signal_add(signal_array_t *arr, const char *name, const void *ref)
  66 {
  67     unsigned long tok = a_strhash((const unsigned char *) name);
  68     signal_t *sigfound = signal_array_getbyid(arr, tok);
  69     if(sigfound)
  70         cptr_array_append(&sigfound->sigfuncs, ref);
  71     else
  72     {
  73         signal_t sig = { .id = tok };
  74         cptr_array_append(&sig.sigfuncs, ref);
  75         signal_array_insert(arr, sig);
  76     }
  77 }
  78
  79 /** Remove a signal inside a signal array.
  80  * You are in charge of reference counting.
  81  * \param arr The signal array.
  82  * \param name The signal name.
  83  * \param ref The reference to remove.
  84  */
  85 static inline void
  86 signal_remove(signal_array_t *arr, const char *name, const void *ref)
  87 {
  88     signal_t *sigfound = signal_array_getbyid(arr,
  89                                               a_strhash((const unsigned char *) name));
  90     if(sigfound)
  91         foreach(func, sigfound->sigfuncs)
  92             if(ref == *func)
  93             {
  94                 cptr_array_remove(&sigfound->sigfuncs, func);
  95                 break;
  96             }
  97 }
  98
  99 #endif
 100
 101 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80