| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Standard routines for forwarding sources |
| 4 | * |
| 5 | * (c) 1999 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of the `fwd' port forwarder. |
| 11 | * |
| 12 | * `fwd' is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * `fwd' is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with `fwd'; if not, write to the Free Software Foundation, |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | */ |
| 26 | |
| 27 | #include "fwd.h" |
| 28 | |
| 29 | /*----- Static variables --------------------------------------------------*/ |
| 30 | |
| 31 | static source *sources = 0; |
| 32 | |
| 33 | /*----- Main code ---------------------------------------------------------*/ |
| 34 | |
| 35 | /* --- @source_add@ --- * |
| 36 | * |
| 37 | * Arguments: @source *s@ = pointer to a source |
| 38 | * |
| 39 | * Returns: --- |
| 40 | * |
| 41 | * Use: Adds a source to the master list. Only do this for passive |
| 42 | * sources (e.g., listening sockets), not active sources (e.g., |
| 43 | * executable programs). |
| 44 | */ |
| 45 | |
| 46 | void source_add(source *s) |
| 47 | { |
| 48 | assert(s->ops->shutdown); |
| 49 | assert(!(s->f&SF_ACTIVE)); |
| 50 | s->next = sources; |
| 51 | s->prev = 0; |
| 52 | if (sources) |
| 53 | sources->prev = s; |
| 54 | sources = s; |
| 55 | s->f |= SF_ACTIVE; |
| 56 | source_inc(s); |
| 57 | } |
| 58 | |
| 59 | /* --- @source_remove@ --- * |
| 60 | * |
| 61 | * Arguments: @source *s@ = pointer to a source |
| 62 | * |
| 63 | * Returns: --- |
| 64 | * |
| 65 | * Use: Removes a source from the master list. |
| 66 | */ |
| 67 | |
| 68 | void source_remove(source *s) |
| 69 | { |
| 70 | assert(s->f&SF_ACTIVE); |
| 71 | if (s->next) |
| 72 | s->next->prev = s->prev; |
| 73 | if (s->prev) |
| 74 | s->prev->next = s->next; |
| 75 | else |
| 76 | sources = s->next; |
| 77 | s->f &= ~SF_ACTIVE; |
| 78 | source_dec(s); |
| 79 | } |
| 80 | |
| 81 | /* --- @source_inc@ --- * |
| 82 | * |
| 83 | * Arguments: @source *s@ = pointer to a source |
| 84 | * |
| 85 | * Returns: --- |
| 86 | * |
| 87 | * Use: Increments a source's refcount. |
| 88 | */ |
| 89 | |
| 90 | void source_inc(source *s) { s->ref++; } |
| 91 | |
| 92 | /* --- @source_dec@ --- * |
| 93 | * |
| 94 | * Arguments: @source *s@ = pointer to a source |
| 95 | * |
| 96 | * Returns: --- |
| 97 | * |
| 98 | * Use: Decrements a source's refcount, destroying it if necessary. |
| 99 | */ |
| 100 | |
| 101 | void source_dec(source *s) |
| 102 | { |
| 103 | assert(s->ref > 0); |
| 104 | s->ref--; |
| 105 | if (!s->ref) { |
| 106 | if (s->f&SF_ACTIVE) s->ops->shutdown(s); |
| 107 | s->ops->destroy(s); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /* --- @source_killall@ --- * |
| 112 | * |
| 113 | * Arguments: --- |
| 114 | * |
| 115 | * Returns: --- |
| 116 | * |
| 117 | * Use: Frees all sources. |
| 118 | */ |
| 119 | |
| 120 | void source_killall(void) |
| 121 | { |
| 122 | source *s = sources; |
| 123 | while (s) { |
| 124 | source *ss = s; |
| 125 | s = s->next; |
| 126 | ss->ops->shutdown(ss); |
| 127 | } |
| 128 | sources = 0; |
| 129 | } |
| 130 | |
| 131 | /*----- That's all, folks -------------------------------------------------*/ |