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annotate rogue4/mach_dep.c @ 280:70aa5808c782

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Fix potential segfaults at restore related to ctime(). In some games, restore() passes the result of ctime() to mvprintw() or some other variadic message-formatting function. If ctime() has not been declared properly, its return type is inferred to be int instead of char *. This does not cause a warning because the compiler does not know the correct type of variadic arguments. On platforms where ints and pointers are not the same size, this can, probably depending on alignment, result in a segfault that is not easy to trace. Including time.h fixes the problem. Some games manually declared ctime() and avoided the bug. These declarations have also been replaced with the include.
author John "Elwin" Edwards
date Fri, 15 Sep 2017 20:51:10 -0400
parents d3968e9cb98d
children 6376b514a30b
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1 /*
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2 * Various installation dependent routines
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3 *
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4 * @(#)mach_dep.c 4.23 (Berkeley) 5/19/82
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5 *
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6 * Rogue: Exploring the Dungeons of Doom
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7 * Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman
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8 * All rights reserved.
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9 *
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10 * See the file LICENSE.TXT for full copyright and licensing information.
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11 */
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12
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13 /*
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14 * The various tuneable defines are:
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15 *
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16 * SCOREFILE Where/if the score file should live.
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17 * MAXLOAD What (if any) the maximum load average should be
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18 * when people are playing. If defined, then
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19 * LOADAV Should rogue define it's own routine to
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20 * get the load average?
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21 * NAMELIST If so, where does the system namelist hide?
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22 * MAXUSERS What (if any) the maximum user count should be
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23 * when people are playing. If defined, then
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24 * UCOUNT Should rogue define it's own routine to
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25 * count users?
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26 * UTMP If so, where does the user list hide?
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27 * CHECKTIME How often/if rogue should check during the game
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28 * for high load average.
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29 */
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30
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31 #include <limits.h>
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32 #include <stdlib.h>
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33 #include <stdio.h>
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34 #include <curses.h>
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35 #include <time.h>
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36 #include <signal.h>
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37 #include <sys/stat.h>
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38 #include <fcntl.h>
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39 #include <string.h>
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40 #include <errno.h>
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41 #include "rogue.h"
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42
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43 int num_checks; /* times we've gone over in checkout() */
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44
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45 #ifdef SCOREFILE
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46 #ifdef LOCKFILE
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47 static char *lockfile = LOCKFILE;
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48 #endif
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49 #endif
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50
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51 int too_much(void);
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52 bool author(void);
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53 void checkout(int s);
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54 void chmsg(char *fmt, int arg);
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55
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56 /*
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57 * init_check:
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58 * Check out too see if it is proper to play the game now
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59 */
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60 void
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61 init_check(void)
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62 {
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63 if (too_much())
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64 {
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65 printf("Sorry, %s, but the system is too loaded now.\n", whoami);
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66 printf("Try again later. Meanwhile, why not enjoy a%s %s?\n",
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67 vowelstr(fruit), fruit);
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68 if (author())
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69 printf("However, since you're a good guy, it's up to you\n");
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70 else
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71 exit(1);
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72 }
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73 }
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74
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75 /*
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76 * open_score:
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77 * Open up the score file for future use, and then
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78 * setuid(getuid()) in case we are running setuid.
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79 */
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80 void
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81 open_score(void)
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82 {
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83 #ifdef SCOREFILE
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84 score_file = fopen(SCOREFILE, "r+");
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85 if ((score_file == NULL) && (errno == ENOENT)) {
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86 score_file = fopen(SCOREFILE, "w+");
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87 }
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88 #else
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89 score_file = NULL;
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90 #endif
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91 if (!use_savedir)
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92 md_normaluser();
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93 return;
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94 }
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95
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96 void
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97 open_log(void)
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