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annotate xrogue/daemon.c @ 144:708bb2dea17c

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arogue7, xrogue: prevent potential NULL dereferencing. It is possible for getpwuid() to fail and return NULL. Various md_get* functions now check for this.
author John "Elwin" Edwards
date Mon, 18 May 2015 10:53:22 -0400
parents cfa9d1609b78
children cadff8f047a1
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1 /*
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2 daemon.c - functions for dealing with things that happen in the future
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3
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4 XRogue: Expeditions into the Dungeons of Doom
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5 Copyright (C) 1991 Robert Pietkivitch
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6 All rights reserved.
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7
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8 Based on "Advanced Rogue"
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9 Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
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10 All rights reserved.
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11
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12 Based on "Rogue: Exploring the Dungeons of Doom"
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13 Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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14 All rights reserved.
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15
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16 See the file LICENSE.TXT for full copyright and licensing information.
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17 */
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18
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19 #include <curses.h>
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20 #include "rogue.h"
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21
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22 #define EMPTY 0
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23 #define DAEMON -1
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24
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25 #define _X_ { EMPTY }
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26
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27 struct delayed_action d_list[MAXDAEMONS] = {
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28 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_
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29 };
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30 struct delayed_action f_list[MAXFUSES] = {
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31 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_,
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32 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_
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33 };
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34
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35 int demoncnt = 0; /* number of active daemons */
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36 int fusecnt = 0;
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37
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38
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39 /*
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40 * d_slot:
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41 * Find an empty slot in the daemon list
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42 */
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43 struct delayed_action *
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44 d_slot()
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45 {
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46 reg int i;
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47 reg struct delayed_action *dev;
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48
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49 for (i = 0, dev = d_list; i < MAXDAEMONS; i++, dev++)
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50 if (dev->d_type == EMPTY)
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51 return dev;
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52 return NULL;
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53 }
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54
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55 /*
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56 * f_slot:
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57 * Find an empty slot in the fuses list
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58 */
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59 struct delayed_action *
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60 f_slot()
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61 {
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62 reg int i;
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63 reg struct delayed_action *dev;
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64
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65 for (i = 0, dev = f_list; i < MAXFUSES; i++, dev++)
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66 if (dev->d_type == EMPTY)
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67 return dev;
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68 return NULL;
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69 }
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70
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71 /*
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72 * find_slot:
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73 * Find a particular slot in the table
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74 */
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75
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76 struct delayed_action *
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77 find_slot(func)
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78 reg int (*func)();
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79 {
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80 reg int i;
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81 reg struct delayed_action *dev;
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82
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83 for (i = 0, dev = f_list; i < MAXFUSES; i++, dev++)
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84 if (dev->d_type != EMPTY && func == dev->d_func)
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85 return dev;
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86 return NULL;
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87 }
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88
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89 /*
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90 * daemon:
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91 * Start a daemon, takes a function.
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92 */
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93
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