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32 * @(#)machdep.c 8.1 (Berkeley) 5/31/93
33 * $FreeBSD: src/games/rogue/machdep.c,v 1.6.2.1 2001/12/17 12:43:23 phantom Exp $
34 * $DragonFly: src/games/rogue/machdep.c,v 1.4 2006/09/09 02:21:49 pavalos Exp $
40 * This source herein may be modified and/or distributed by anybody who
41 * so desires, with the following restrictions:
42 * 1.) No portion of this notice shall be removed.
43 * 2.) Credit shall not be taken for the creation of this source.
44 * 3.) This code is not to be traded, sold, or used for personal
49 /* Included in this file are all system dependent routines. Extensive use
50 * of #ifdef's will be used to compile the appropriate code on each system:
52 * UNIX: all UNIX systems.
53 * UNIX_BSD4_2: UNIX BSD 4.2 and later, UTEK, (4.1 BSD too?)
54 * UNIX_SYSV: UNIX system V
55 * UNIX_V7: UNIX version 7
57 * All UNIX code should be included between the single "#ifdef UNIX" at the
58 * top of this file, and the "#endif" at the bottom.
60 * To change a routine to include a new UNIX system, simply #ifdef the
61 * existing routine, as in the following example:
63 * To make a routine compatible with UNIX system 5, change the first
64 * function to the second:
80 * Appropriate variations of this are of course acceptible.
81 * The use of "#elseif" is discouraged because of non-portability.
82 * If the correct #define doesn't exist, "UNIX_SYSV" in this case, make it up
83 * and insert it in the list at the top of the file. Alter the CFLAGS
84 * in you Makefile appropriately.
91 #include <sys/types.h>
111 #include "pathnames.h"
115 * This routine throws away all keyboard input that has not
116 * yet been read. It is used to get rid of input that the user may have
119 * This function is not necessary, so it may be stubbed. The might cause
120 * message-line output to flash by because the game has continued to read
121 * input without waiting for the user to read the message. Not such a
131 /* md_control_keybord():
133 * This routine is much like md_cbreak_no_echo_nonl() below. It sets up the
134 * keyboard for appropriate input. Specifically, it prevents the tty driver
135 * from stealing characters. For example, ^Y is needed as a command
136 * character, but the tty driver intercepts it for another purpose. Any
137 * such behavior should be stopped. This routine could be avoided if
138 * we used RAW mode instead of CBREAK. But RAW mode does not allow the
139 * generation of keyboard signals, which the program uses.
141 * The parameter 'mode' when true, indicates that the keyboard should
142 * be set up to play rogue. When false, it should be restored if
145 * This routine is not strictly necessary and may be stubbed. This may
146 * cause certain command characters to be unavailable.
150 md_control_keybord(boolean mode)
152 static boolean called_before = 0;
154 static struct ltchars ltc_orig;
155 static struct tchars tc_orig;
156 struct ltchars ltc_temp;
157 struct tchars tc_temp;
160 static struct termio _oldtty;
164 if (!called_before) {
167 ioctl(0, TIOCGETC, &tc_orig);
168 ioctl(0, TIOCGLTC, <c_orig);
171 ioctl(0, TCGETA, &_oldtty);
184 ltc_temp.t_suspc = ltc_temp.t_dsuspc = -1;
185 ltc_temp.t_rprntc = ltc_temp.t_flushc = -1;
186 ltc_temp.t_werasc = ltc_temp.t_lnextc = -1;
187 tc_temp.t_startc = tc_temp.t_stopc = -1;
190 _tty.c_cc[VSWTCH] = CNSWTCH;
194 ioctl(0, TIOCSETC, &tc_temp);
195 ioctl(0, TIOCSLTC, <c_temp);
198 ioctl(0, TCSETA, &_tty);
202 /* md_heed_signals():
204 * This routine tells the program to call particular routines when
205 * certain interrupts/events occur:
207 * SIGINT: call onintr() to interrupt fight with monster or long rest.
208 * SIGQUIT: call byebye() to check for game termination.
209 * SIGHUP: call error_save() to save game when terminal hangs up.
211 * On VMS, SIGINT and SIGQUIT correspond to ^C and ^Y.
213 * This routine is not strictly necessary and can be stubbed. This will
214 * mean that the game cannot be interrupted properly with keyboard
215 * input, this is not usually critical.
219 md_heed_signals(void)
221 signal(SIGINT, (sig_t)onintr);
222 signal(SIGQUIT, (sig_t)byebye);
223 signal(SIGHUP, (sig_t)error_save);
226 /* md_ignore_signals():
228 * This routine tells the program to completely ignore the events mentioned
229 * in md_heed_signals() above. The event handlers will later be turned on
230 * by a future call to md_heed_signals(), so md_heed_signals() and
231 * md_ignore_signals() need to work together.
233 * This function should be implemented or the user risks interrupting
234 * critical sections of code, which could cause score file, or saved-game
239 md_ignore_signals(void)
241 signal(SIGQUIT, SIG_IGN);
242 signal(SIGINT, SIG_IGN);
243 signal(SIGHUP, SIG_IGN);
248 * This function returns an integer that uniquely identifies the specified
249 * file. It need not check for the file's existence. In UNIX, the inode
252 * This function is used to identify saved-game files.
256 md_get_file_id(const char *fname)
260 if (stat(fname, &sbuf)) {
263 return((int)sbuf.st_ino);
268 * This routine returns the number of hard links to the specified file.
270 * This function is not strictly necessary. On systems without hard links
271 * this routine can be stubbed by just returning 1.
275 md_link_count(const char *fname)
280 return((int)sbuf.st_nlink);
283 /* md_gct(): (Get Current Time)
285 * This function returns the current year, month(1-12), day(1-31), hour(0-23),
286 * minute(0-59), and second(0-59). This is used for identifying the time
287 * at which a game is saved.
289 * This function is not strictly necessary. It can be stubbed by returning
290 * zeros instead of the correct year, month, etc. If your operating
291 * system doesn't provide all of the time units requested here, then you
292 * can provide only those that it does, and return zeros for the others.
293 * If you cannot provide good time values, then users may be able to copy
294 * saved-game files and play them.
298 md_gct(struct rogue_time *rt_buf)
304 t = localtime(&seconds);
306 rt_buf->year = t->tm_year;
307 rt_buf->month = t->tm_mon + 1;
308 rt_buf->day = t->tm_mday;
309 rt_buf->hour = t->tm_hour;
310 rt_buf->minute = t->tm_min;
311 rt_buf->second = t->tm_sec;
314 /* md_gfmt: (Get File Modification Time)
316 * This routine returns a file's date of last modification in the same format
319 * This function is not strictly necessary. It is used to see if saved-game
320 * files have been modified since they were saved. If you have stubbed the
321 * routine md_gct() above by returning constant values, then you may do
322 * exactly the same here.
323 * Or if md_gct() is implemented correctly, but your system does not provide
324 * file modification dates, you may return some date far in the past so
325 * that the program will never know that a saved-game file being modified.
326 * You may also do this if you wish to be able to restore games from
327 * saved-games that have been modified.
331 md_gfmt(const char *fname, struct rogue_time *rt_buf)
338 seconds = sbuf.st_mtime;
339 t = localtime(&seconds);
341 rt_buf->year = t->tm_year;
342 rt_buf->month = t->tm_mon + 1;
343 rt_buf->day = t->tm_mday;
344 rt_buf->hour = t->tm_hour;
345 rt_buf->minute = t->tm_min;
346 rt_buf->second = t->tm_sec;
349 /* md_df: (Delete File)
351 * This function deletes the specified file, and returns true (1) if the
352 * operation was successful. This is used to delete saved-game files
353 * after restoring games from them.
355 * Again, this function is not strictly necessary, and can be stubbed
356 * by simply returning 1. In this case, saved-game files will not be
357 * deleted and can be replayed.
361 md_df(const char *fname)
369 /* md_gln: (Get login name)
371 * This routine returns the login name of the user. This string is
372 * used mainly for identifying users in score files.
374 * A dummy string may be returned if you are unable to implement this
375 * function, but then the score file would only have one name in it.
384 if ((s = getlogin()))
386 if (!(p = getpwuid(getuid())))
393 * This routine causes the game to pause for the specified number of
396 * This routine is not particularly necessary at all. It is used for
397 * delaying execution, which is useful to this program at some times.
408 * This routine gets certain values from the user's environment. These
409 * values are strings, and each string is identified by a name. The names
410 * of the values needed, and their use, is as follows:
413 * A string containing the various game options. This need not be
416 * The user's home directory. This is only used when the user specifies
417 * '~' as the first character of a saved-game file. This string need
420 * The user's favorite shell. If not found, "/bin/sh" is assumed.
425 md_getenv(const char *name)
429 value = getenv(name);
436 * This routine allocates, and returns a pointer to, the specified number
437 * of bytes. This routines absolutely MUST be implemented for your
438 * particular system or the program will not run at all. Return zero
439 * when no more memory can be allocated.
451 /* md_gseed() (Get Seed)
453 * This function returns a seed for the random number generator (RNG). This
454 * seed causes the RNG to begin generating numbers at some point in its
455 * sequence. Without a random seed, the RNG will generate the same set
456 * of numbers, and every game will start out exactly the same way. A good
457 * number to use is the process id, given by getpid() on most UNIX systems.
459 * You need to find some single random integer, such as:
461 * current time (minutes + seconds) returned from md_gct(), if implemented.
463 * It will not help to return "get_rand()" or "rand()" or the return value of
464 * any pseudo-RNG. If you don't have a random number, you can just return 1,
465 * but this means your games will ALWAYS start the same way, and will play
466 * exactly the same way given the same input.
475 return((int)seconds);
480 * This function causes the program to discontinue execution and exit.
481 * This function must be implemented or the program will continue to
482 * hang when it should quit.
493 * This function is intended to give the user exclusive access to the score
494 * file. It does so by flock'ing the score file. The full path name of the
495 * score file should be defined for any particular site in rogue.h. The
496 * constants _PATH_SCOREFILE defines this file name.
498 * When the parameter 'l' is non-zero (true), a lock is requested. Otherwise
499 * the lock is released.
509 if ((fd = open(_PATH_SCOREFILE, O_RDONLY)) < 1) {
510 message("cannot lock score file", 0);
513 for (tries = 0; tries < 5; tries++)
514 if (!flock(fd, LOCK_EX|LOCK_NB))
524 * This function spawns a shell for the user to use. When this shell is
525 * terminated, the game continues. Since this program may often be run
526 * setuid to gain access to privileged files, care is taken that the shell
527 * is run with the user's REAL user id, and not the effective user id.
528 * The effective user id is restored after the shell completes.
532 md_shell(const char *shell)
544 execl(shell, shell, NULL);