Mercurial > dropbear

annotate queue.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 06d52bcb8094
children
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "dbutil.h"
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27 #include "queue.h"
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28
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29 void initqueue(struct Queue* queue) {
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31 queue->head = NULL;
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32 queue->tail = NULL;
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33 queue->count = 0;
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34 }
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35
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36 int isempty(const struct Queue* queue) {
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38 return (queue->head == NULL);
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39 }
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41 void* dequeue(struct Queue* queue) {
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42
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43 void* ret;
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44 struct Link* oldhead;
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45 dropbear_assert(!isempty(queue));
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47 ret = queue->head->item;
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48 oldhead = queue->head;
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50 if (oldhead->link != NULL) {
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51 queue->head = oldhead->link;
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52 } else {
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53 queue->head = NULL;
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54 queue->tail = NULL;
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55 TRACE(("empty queue dequeing"))
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56 }
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58 m_free(oldhead);
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59 queue->count--;
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60 return ret;
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61 }
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63 void *examine(const struct Queue* queue) {
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65 dropbear_assert(!isempty(queue));
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66 return queue->head->item;
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67 }
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69 void enqueue(struct Queue* queue, void* item) {
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70
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71 struct Link* newlink;
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73 newlink = (struct Link*)m_malloc(sizeof(struct Link));
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75 newlink->item = item;
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76 newlink->link = NULL;
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78 if (queue->tail != NULL) {
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79 queue->tail->link = newlink;
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80 }
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81 queue->tail = newlink;
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83 if (queue->head == NULL) {
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84 queue->head = newlink;
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85 }
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86 queue->count++;
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87 }