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annotate rogue3/daemon.c @ 81:0e212d46b68f

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rogue4: don't put savefile metadata into the savefile. The save_file() function in save.c stored the savefile's device number, inode number, creation time, and modification time in the file. The restore() function read them back, and apparently used to compare them to protect against cheaters. Unfortunately, the types and sizes of these numbers differ from system to system, which ruins the Roguelike Restoration Project's fine portability work. So they have been removed from the savefile. This BREAKS SAVEFILE COMPATIBILITY, but old files can be converted by excising the chunk starting at offset 0x22 with length sizeof(ino_t) + sizeof(dev_t) + 2 * sizeof(time_t). That's 0x14 on i686 and 0x20 on x86_64, at least with current versions of Linux and glibc.
author John "Elwin" Edwards
date Mon, 05 Aug 2013 20:49:41 -0700
parents 527e2150eaf0
children
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1 /*
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2 * Contains functions for dealing with things that happen in the
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3 * future.
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4 *
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5 * @(#)daemon.c 3.3 (Berkeley) 6/15/81
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6 *
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7 * Rogue: Exploring the Dungeons of Doom
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8 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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9 * All rights reserved.
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10 *
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11 * See the file LICENSE.TXT for full copyright and licensing information.
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12 */
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13
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14 #include "curses.h"
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15 #include "rogue.h"
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16
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17 #define EMPTY 0
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18 #define DAEMON -1
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19 #define MAXDAEMONS 20
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20
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21 #define _X_ { EMPTY }
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22
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23 struct delayed_action d_list[MAXDAEMONS] = {
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24 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_,
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25 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_,
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26 };
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27
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28 /*
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29 * d_slot:
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30 * Find an empty slot in the daemon/fuse list
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31 */
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32 struct delayed_action *
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33 d_slot()
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34 {
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35 register int i;
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36 register struct delayed_action *dev;
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37
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38 for (i = 0, dev = d_list; i < MAXDAEMONS; i++, dev++)
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39 if (dev->d_type == EMPTY)
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40 return dev;
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41 debug("Ran out of fuse slots");
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42 return NULL;
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43 }
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44
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45 /*
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46 * find_slot:
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47 * Find a particular slot in the table
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48 */
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49
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50 struct delayed_action *
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51 find_slot(void (*func)())
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52 {
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53 register int i;
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54 register struct delayed_action *dev;
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55
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56 for (i = 0, dev = d_list; i < MAXDAEMONS; i++, dev++)
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57 if (dev->d_type != EMPTY && func == dev->d_func)
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58 return dev;
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59 return NULL;
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60 }
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61
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62 /*
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63 * daemon:
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64 * Start a daemon, takes a function.
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65 */
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66
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67 void
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68 start_daemon(void (*func)(), int arg, int type)
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69 {
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70 register struct delayed_action *dev;
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71
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72 dev = d_slot();
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73
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74 if (dev != NULL)
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75 {
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76 dev->d_type = type;
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77 dev->d_func = func;
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78 dev->d_arg = arg;
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79 dev->d_time = DAEMON;
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80 }
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81 }
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82
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83 /*
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84 * kill_daemon:
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85 * Remove a daemon from the list
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86 */
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87
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88 void
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89 kill_daemon(void (*func)())
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90 {
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91 register struct delayed_action *dev;
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92
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93 if ((dev = find_slot(func)) == NULL)
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94 return;
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95 /*
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96 * Take it out of the list
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97 */
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98 dev->d_type = EMPTY;
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99 }
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100
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101 /*
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102 * do_daemons:
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103 * Run all the daemons that are active with the current flag,
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104 * passing the argument to the function.
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105 */
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