Line data Source code
1 : /*
2 : * OS specific functions
3 : * Copyright (c) 2005-2009, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #ifndef OS_H
10 : #define OS_H
11 :
12 : typedef long os_time_t;
13 :
14 : /**
15 : * os_sleep - Sleep (sec, usec)
16 : * @sec: Number of seconds to sleep
17 : * @usec: Number of microseconds to sleep
18 : */
19 : void os_sleep(os_time_t sec, os_time_t usec);
20 :
21 : struct os_time {
22 : os_time_t sec;
23 : os_time_t usec;
24 : };
25 :
26 : struct os_reltime {
27 : os_time_t sec;
28 : os_time_t usec;
29 : };
30 :
31 : /**
32 : * os_get_time - Get current time (sec, usec)
33 : * @t: Pointer to buffer for the time
34 : * Returns: 0 on success, -1 on failure
35 : */
36 : int os_get_time(struct os_time *t);
37 :
38 : /**
39 : * os_get_reltime - Get relative time (sec, usec)
40 : * @t: Pointer to buffer for the time
41 : * Returns: 0 on success, -1 on failure
42 : */
43 : int os_get_reltime(struct os_reltime *t);
44 :
45 :
46 : /* Helpers for handling struct os_time */
47 :
48 : static inline int os_time_before(struct os_time *a, struct os_time *b)
49 : {
50 : return (a->sec < b->sec) ||
51 : (a->sec == b->sec && a->usec < b->usec);
52 : }
53 :
54 :
55 : static inline void os_time_sub(struct os_time *a, struct os_time *b,
56 : struct os_time *res)
57 : {
58 : res->sec = a->sec - b->sec;
59 : res->usec = a->usec - b->usec;
60 : if (res->usec < 0) {
61 : res->sec--;
62 : res->usec += 1000000;
63 : }
64 : }
65 :
66 :
67 : /* Helpers for handling struct os_reltime */
68 :
69 1885767 : static inline int os_reltime_before(struct os_reltime *a,
70 : struct os_reltime *b)
71 : {
72 4016387 : return (a->sec < b->sec) ||
73 1326921 : (a->sec == b->sec && a->usec < b->usec);
74 : }
75 :
76 :
77 669370 : static inline void os_reltime_sub(struct os_reltime *a, struct os_reltime *b,
78 : struct os_reltime *res)
79 : {
80 669370 : res->sec = a->sec - b->sec;
81 669370 : res->usec = a->usec - b->usec;
82 669370 : if (res->usec < 0) {
83 295527 : res->sec--;
84 295527 : res->usec += 1000000;
85 : }
86 669370 : }
87 :
88 :
89 321 : static inline void os_reltime_age(struct os_reltime *start,
90 : struct os_reltime *age)
91 : {
92 : struct os_reltime now;
93 :
94 321 : os_get_reltime(&now);
95 321 : os_reltime_sub(&now, start, age);
96 321 : }
97 :
98 :
99 6342 : static inline int os_reltime_expired(struct os_reltime *now,
100 : struct os_reltime *ts,
101 : os_time_t timeout_secs)
102 : {
103 : struct os_reltime age;
104 :
105 6342 : os_reltime_sub(now, ts, &age);
106 12706 : return (age.sec > timeout_secs) ||
107 6339 : (age.sec == timeout_secs && age.usec > 0);
108 : }
109 :
110 :
111 4703 : static inline int os_reltime_initialized(struct os_reltime *t)
112 : {
113 4703 : return t->sec != 0 || t->usec != 0;
114 : }
115 :
116 :
117 : /**
118 : * os_mktime - Convert broken-down time into seconds since 1970-01-01
119 : * @year: Four digit year
120 : * @month: Month (1 .. 12)
121 : * @day: Day of month (1 .. 31)
122 : * @hour: Hour (0 .. 23)
123 : * @min: Minute (0 .. 59)
124 : * @sec: Second (0 .. 60)
125 : * @t: Buffer for returning calendar time representation (seconds since
126 : * 1970-01-01 00:00:00)
127 : * Returns: 0 on success, -1 on failure
128 : *
129 : * Note: The result is in seconds from Epoch, i.e., in UTC, not in local time
130 : * which is used by POSIX mktime().
131 : */
132 : int os_mktime(int year, int month, int day, int hour, int min, int sec,
133 : os_time_t *t);
134 :
135 : struct os_tm {
136 : int sec; /* 0..59 or 60 for leap seconds */
137 : int min; /* 0..59 */
138 : int hour; /* 0..23 */
139 : int day; /* 1..31 */
140 : int month; /* 1..12 */
141 : int year; /* Four digit year */
142 : };
143 :
144 : int os_gmtime(os_time_t t, struct os_tm *tm);
145 :
146 : /**
147 : * os_daemonize - Run in the background (detach from the controlling terminal)
148 : * @pid_file: File name to write the process ID to or %NULL to skip this
149 : * Returns: 0 on success, -1 on failure
150 : */
151 : int os_daemonize(const char *pid_file);
152 :
153 : /**
154 : * os_daemonize_terminate - Stop running in the background (remove pid file)
155 : * @pid_file: File name to write the process ID to or %NULL to skip this
156 : */
157 : void os_daemonize_terminate(const char *pid_file);
158 :
159 : /**
160 : * os_get_random - Get cryptographically strong pseudo random data
161 : * @buf: Buffer for pseudo random data
162 : * @len: Length of the buffer
163 : * Returns: 0 on success, -1 on failure
164 : */
165 : int os_get_random(unsigned char *buf, size_t len);
166 :
167 : /**
168 : * os_random - Get pseudo random value (not necessarily very strong)
169 : * Returns: Pseudo random value
170 : */
171 : unsigned long os_random(void);
172 :
173 : /**
174 : * os_rel2abs_path - Get an absolute path for a file
175 : * @rel_path: Relative path to a file
176 : * Returns: Absolute path for the file or %NULL on failure
177 : *
178 : * This function tries to convert a relative path of a file to an absolute path
179 : * in order for the file to be found even if current working directory has
180 : * changed. The returned value is allocated and caller is responsible for
181 : * freeing it. It is acceptable to just return the same path in an allocated
182 : * buffer, e.g., return strdup(rel_path). This function is only used to find
183 : * configuration files when os_daemonize() may have changed the current working
184 : * directory and relative path would be pointing to a different location.
185 : */
186 : char * os_rel2abs_path(const char *rel_path);
187 :
188 : /**
189 : * os_program_init - Program initialization (called at start)
190 : * Returns: 0 on success, -1 on failure
191 : *
192 : * This function is called when a programs starts. If there are any OS specific
193 : * processing that is needed, it can be placed here. It is also acceptable to
194 : * just return 0 if not special processing is needed.
195 : */
196 : int os_program_init(void);
197 :
198 : /**
199 : * os_program_deinit - Program deinitialization (called just before exit)
200 : *
201 : * This function is called just before a program exists. If there are any OS
202 : * specific processing, e.g., freeing resourced allocated in os_program_init(),
203 : * it should be done here. It is also acceptable for this function to do
204 : * nothing.
205 : */
206 : void os_program_deinit(void);
207 :
208 : /**
209 : * os_setenv - Set environment variable
210 : * @name: Name of the variable
211 : * @value: Value to set to the variable
212 : * @overwrite: Whether existing variable should be overwritten
213 : * Returns: 0 on success, -1 on error
214 : *
215 : * This function is only used for wpa_cli action scripts. OS wrapper does not
216 : * need to implement this if such functionality is not needed.
217 : */
218 : int os_setenv(const char *name, const char *value, int overwrite);
219 :
220 : /**
221 : * os_unsetenv - Delete environent variable
222 : * @name: Name of the variable
223 : * Returns: 0 on success, -1 on error
224 : *
225 : * This function is only used for wpa_cli action scripts. OS wrapper does not
226 : * need to implement this if such functionality is not needed.
227 : */
228 : int os_unsetenv(const char *name);
229 :
230 : /**
231 : * os_readfile - Read a file to an allocated memory buffer
232 : * @name: Name of the file to read
233 : * @len: For returning the length of the allocated buffer
234 : * Returns: Pointer to the allocated buffer or %NULL on failure
235 : *
236 : * This function allocates memory and reads the given file to this buffer. Both
237 : * binary and text files can be read with this function. The caller is
238 : * responsible for freeing the returned buffer with os_free().
239 : */
240 : char * os_readfile(const char *name, size_t *len);
241 :
242 : /**
243 : * os_file_exists - Check whether the specified file exists
244 : * @fname: Path and name of the file
245 : * Returns: 1 if the file exists or 0 if not
246 : */
247 : int os_file_exists(const char *fname);
248 :
249 : /**
250 : * os_fdatasync - Sync a file's (for a given stream) state with storage device
251 : * @stream: the stream to be flushed
252 : * Returns: 0 if the operation succeeded or -1 on failure
253 : */
254 : int os_fdatasync(FILE *stream);
255 :
256 : /**
257 : * os_zalloc - Allocate and zero memory
258 : * @size: Number of bytes to allocate
259 : * Returns: Pointer to allocated and zeroed memory or %NULL on failure
260 : *
261 : * Caller is responsible for freeing the returned buffer with os_free().
262 : */
263 : void * os_zalloc(size_t size);
264 :
265 : /**
266 : * os_calloc - Allocate and zero memory for an array
267 : * @nmemb: Number of members in the array
268 : * @size: Number of bytes in each member
269 : * Returns: Pointer to allocated and zeroed memory or %NULL on failure
270 : *
271 : * This function can be used as a wrapper for os_zalloc(nmemb * size) when an
272 : * allocation is used for an array. The main benefit over os_zalloc() is in
273 : * having an extra check to catch integer overflows in multiplication.
274 : *
275 : * Caller is responsible for freeing the returned buffer with os_free().
276 : */
277 112387 : static inline void * os_calloc(size_t nmemb, size_t size)
278 : {
279 112387 : if (size && nmemb > (~(size_t) 0) / size)
280 3 : return NULL;
281 112384 : return os_zalloc(nmemb * size);
282 : }
283 :
284 :
285 : /*
286 : * The following functions are wrapper for standard ANSI C or POSIX functions.
287 : * By default, they are just defined to use the standard function name and no
288 : * os_*.c implementation is needed for them. This avoids extra function calls
289 : * by allowing the C pre-processor take care of the function name mapping.
290 : *
291 : * If the target system uses a C library that does not provide these functions,
292 : * build_config.h can be used to define the wrappers to use a different
293 : * function name. This can be done on function-by-function basis since the
294 : * defines here are only used if build_config.h does not define the os_* name.
295 : * If needed, os_*.c file can be used to implement the functions that are not
296 : * included in the C library on the target system. Alternatively,
297 : * OS_NO_C_LIB_DEFINES can be defined to skip all defines here in which case
298 : * these functions need to be implemented in os_*.c file for the target system.
299 : */
300 :
301 : #ifdef OS_NO_C_LIB_DEFINES
302 :
303 : /**
304 : * os_malloc - Allocate dynamic memory
305 : * @size: Size of the buffer to allocate
306 : * Returns: Allocated buffer or %NULL on failure
307 : *
308 : * Caller is responsible for freeing the returned buffer with os_free().
309 : */
310 : void * os_malloc(size_t size);
311 :
312 : /**
313 : * os_realloc - Re-allocate dynamic memory
314 : * @ptr: Old buffer from os_malloc() or os_realloc()
315 : * @size: Size of the new buffer
316 : * Returns: Allocated buffer or %NULL on failure
317 : *
318 : * Caller is responsible for freeing the returned buffer with os_free().
319 : * If re-allocation fails, %NULL is returned and the original buffer (ptr) is
320 : * not freed and caller is still responsible for freeing it.
321 : */
322 : void * os_realloc(void *ptr, size_t size);
323 :
324 : /**
325 : * os_free - Free dynamic memory
326 : * @ptr: Old buffer from os_malloc() or os_realloc(); can be %NULL
327 : */
328 : void os_free(void *ptr);
329 :
330 : /**
331 : * os_memcpy - Copy memory area
332 : * @dest: Destination
333 : * @src: Source
334 : * @n: Number of bytes to copy
335 : * Returns: dest
336 : *
337 : * The memory areas src and dst must not overlap. os_memmove() can be used with
338 : * overlapping memory.
339 : */
340 : void * os_memcpy(void *dest, const void *src, size_t n);
341 :
342 : /**
343 : * os_memmove - Copy memory area
344 : * @dest: Destination
345 : * @src: Source
346 : * @n: Number of bytes to copy
347 : * Returns: dest
348 : *
349 : * The memory areas src and dst may overlap.
350 : */
351 : void * os_memmove(void *dest, const void *src, size_t n);
352 :
353 : /**
354 : * os_memset - Fill memory with a constant byte
355 : * @s: Memory area to be filled
356 : * @c: Constant byte
357 : * @n: Number of bytes started from s to fill with c
358 : * Returns: s
359 : */
360 : void * os_memset(void *s, int c, size_t n);
361 :
362 : /**
363 : * os_memcmp - Compare memory areas
364 : * @s1: First buffer
365 : * @s2: Second buffer
366 : * @n: Maximum numbers of octets to compare
367 : * Returns: An integer less than, equal to, or greater than zero if s1 is
368 : * found to be less than, to match, or be greater than s2. Only first n
369 : * characters will be compared.
370 : */
371 : int os_memcmp(const void *s1, const void *s2, size_t n);
372 :
373 : /**
374 : * os_strdup - Duplicate a string
375 : * @s: Source string
376 : * Returns: Allocated buffer with the string copied into it or %NULL on failure
377 : *
378 : * Caller is responsible for freeing the returned buffer with os_free().
379 : */
380 : char * os_strdup(const char *s);
381 :
382 : /**
383 : * os_strlen - Calculate the length of a string
384 : * @s: '\0' terminated string
385 : * Returns: Number of characters in s (not counting the '\0' terminator)
386 : */
387 : size_t os_strlen(const char *s);
388 :
389 : /**
390 : * os_strcasecmp - Compare two strings ignoring case
391 : * @s1: First string
392 : * @s2: Second string
393 : * Returns: An integer less than, equal to, or greater than zero if s1 is
394 : * found to be less than, to match, or be greatred than s2
395 : */
396 : int os_strcasecmp(const char *s1, const char *s2);
397 :
398 : /**
399 : * os_strncasecmp - Compare two strings ignoring case
400 : * @s1: First string
401 : * @s2: Second string
402 : * @n: Maximum numbers of characters to compare
403 : * Returns: An integer less than, equal to, or greater than zero if s1 is
404 : * found to be less than, to match, or be greater than s2. Only first n
405 : * characters will be compared.
406 : */
407 : int os_strncasecmp(const char *s1, const char *s2, size_t n);
408 :
409 : /**
410 : * os_strchr - Locate the first occurrence of a character in string
411 : * @s: String
412 : * @c: Character to search for
413 : * Returns: Pointer to the matched character or %NULL if not found
414 : */
415 : char * os_strchr(const char *s, int c);
416 :
417 : /**
418 : * os_strrchr - Locate the last occurrence of a character in string
419 : * @s: String
420 : * @c: Character to search for
421 : * Returns: Pointer to the matched character or %NULL if not found
422 : */
423 : char * os_strrchr(const char *s, int c);
424 :
425 : /**
426 : * os_strcmp - Compare two strings
427 : * @s1: First string
428 : * @s2: Second string
429 : * Returns: An integer less than, equal to, or greater than zero if s1 is
430 : * found to be less than, to match, or be greatred than s2
431 : */
432 : int os_strcmp(const char *s1, const char *s2);
433 :
434 : /**
435 : * os_strncmp - Compare two strings
436 : * @s1: First string
437 : * @s2: Second string
438 : * @n: Maximum numbers of characters to compare
439 : * Returns: An integer less than, equal to, or greater than zero if s1 is
440 : * found to be less than, to match, or be greater than s2. Only first n
441 : * characters will be compared.
442 : */
443 : int os_strncmp(const char *s1, const char *s2, size_t n);
444 :
445 : /**
446 : * os_strstr - Locate a substring
447 : * @haystack: String (haystack) to search from
448 : * @needle: Needle to search from haystack
449 : * Returns: Pointer to the beginning of the substring or %NULL if not found
450 : */
451 : char * os_strstr(const char *haystack, const char *needle);
452 :
453 : /**
454 : * os_snprintf - Print to a memory buffer
455 : * @str: Memory buffer to print into
456 : * @size: Maximum length of the str buffer
457 : * @format: printf format
458 : * Returns: Number of characters printed (not including trailing '\0').
459 : *
460 : * If the output buffer is truncated, number of characters which would have
461 : * been written is returned. Since some C libraries return -1 in such a case,
462 : * the caller must be prepared on that value, too, to indicate truncation.
463 : *
464 : * Note: Some C library implementations of snprintf() may not guarantee null
465 : * termination in case the output is truncated. The OS wrapper function of
466 : * os_snprintf() should provide this guarantee, i.e., to null terminate the
467 : * output buffer if a C library version of the function is used and if that
468 : * function does not guarantee null termination.
469 : *
470 : * If the target system does not include snprintf(), see, e.g.,
471 : * http://www.ijs.si/software/snprintf/ for an example of a portable
472 : * implementation of snprintf.
473 : */
474 : int os_snprintf(char *str, size_t size, const char *format, ...);
475 :
476 : #else /* OS_NO_C_LIB_DEFINES */
477 :
478 : #ifdef WPA_TRACE
479 : void * os_malloc(size_t size);
480 : void * os_realloc(void *ptr, size_t size);
481 : void os_free(void *ptr);
482 : char * os_strdup(const char *s);
483 : #else /* WPA_TRACE */
484 : #ifndef os_malloc
485 : #define os_malloc(s) malloc((s))
486 : #endif
487 : #ifndef os_realloc
488 : #define os_realloc(p, s) realloc((p), (s))
489 : #endif
490 : #ifndef os_free
491 : #define os_free(p) free((p))
492 : #endif
493 : #ifndef os_strdup
494 : #ifdef _MSC_VER
495 : #define os_strdup(s) _strdup(s)
496 : #else
497 : #define os_strdup(s) strdup(s)
498 : #endif
499 : #endif
500 : #endif /* WPA_TRACE */
501 :
502 : #ifndef os_memcpy
503 : #define os_memcpy(d, s, n) memcpy((d), (s), (n))
504 : #endif
505 : #ifndef os_memmove
506 : #define os_memmove(d, s, n) memmove((d), (s), (n))
507 : #endif
508 : #ifndef os_memset
509 : #define os_memset(s, c, n) memset(s, c, n)
510 : #endif
511 : #ifndef os_memcmp
512 : #define os_memcmp(s1, s2, n) memcmp((s1), (s2), (n))
513 : #endif
514 :
515 : #ifndef os_strlen
516 : #define os_strlen(s) strlen(s)
517 : #endif
518 : #ifndef os_strcasecmp
519 : #ifdef _MSC_VER
520 : #define os_strcasecmp(s1, s2) _stricmp((s1), (s2))
521 : #else
522 : #define os_strcasecmp(s1, s2) strcasecmp((s1), (s2))
523 : #endif
524 : #endif
525 : #ifndef os_strncasecmp
526 : #ifdef _MSC_VER
527 : #define os_strncasecmp(s1, s2, n) _strnicmp((s1), (s2), (n))
528 : #else
529 : #define os_strncasecmp(s1, s2, n) strncasecmp((s1), (s2), (n))
530 : #endif
531 : #endif
532 : #ifndef os_strchr
533 : #define os_strchr(s, c) strchr((s), (c))
534 : #endif
535 : #ifndef os_strcmp
536 : #define os_strcmp(s1, s2) strcmp((s1), (s2))
537 : #endif
538 : #ifndef os_strncmp
539 : #define os_strncmp(s1, s2, n) strncmp((s1), (s2), (n))
540 : #endif
541 : #ifndef os_strrchr
542 : #define os_strrchr(s, c) strrchr((s), (c))
543 : #endif
544 : #ifndef os_strstr
545 : #define os_strstr(h, n) strstr((h), (n))
546 : #endif
547 :
548 : #ifndef os_snprintf
549 : #ifdef _MSC_VER
550 : #define os_snprintf _snprintf
551 : #else
552 : #define os_snprintf snprintf
553 : #endif
554 : #endif
555 :
556 : #endif /* OS_NO_C_LIB_DEFINES */
557 :
558 :
559 7436267 : static inline int os_snprintf_error(size_t size, int res)
560 : {
561 7436267 : return res < 0 || (unsigned int) res >= size;
562 : }
563 :
564 :
565 625645 : static inline void * os_realloc_array(void *ptr, size_t nmemb, size_t size)
566 : {
567 625645 : if (size && nmemb > (~(size_t) 0) / size)
568 1 : return NULL;
569 625644 : return os_realloc(ptr, nmemb * size);
570 : }
571 :
572 : /**
573 : * os_remove_in_array - Remove a member from an array by index
574 : * @ptr: Pointer to the array
575 : * @nmemb: Current member count of the array
576 : * @size: The size per member of the array
577 : * @idx: Index of the member to be removed
578 : */
579 8 : static inline void os_remove_in_array(void *ptr, size_t nmemb, size_t size,
580 : size_t idx)
581 : {
582 8 : if (idx < nmemb - 1)
583 4 : os_memmove(((unsigned char *) ptr) + idx * size,
584 : ((unsigned char *) ptr) + (idx + 1) * size,
585 : (nmemb - idx - 1) * size);
586 8 : }
587 :
588 : /**
589 : * os_strlcpy - Copy a string with size bound and NUL-termination
590 : * @dest: Destination
591 : * @src: Source
592 : * @siz: Size of the target buffer
593 : * Returns: Total length of the target string (length of src) (not including
594 : * NUL-termination)
595 : *
596 : * This function matches in behavior with the strlcpy(3) function in OpenBSD.
597 : */
598 : size_t os_strlcpy(char *dest, const char *src, size_t siz);
599 :
600 : /**
601 : * os_memcmp_const - Constant time memory comparison
602 : * @a: First buffer to compare
603 : * @b: Second buffer to compare
604 : * @len: Number of octets to compare
605 : * Returns: 0 if buffers are equal, non-zero if not
606 : *
607 : * This function is meant for comparing passwords or hash values where
608 : * difference in execution time could provide external observer information
609 : * about the location of the difference in the memory buffers. The return value
610 : * does not behave like os_memcmp(), i.e., os_memcmp_const() cannot be used to
611 : * sort items into a defined order. Unlike os_memcmp(), execution time of
612 : * os_memcmp_const() does not depend on the contents of the compared memory
613 : * buffers, but only on the total compared length.
614 : */
615 : int os_memcmp_const(const void *a, const void *b, size_t len);
616 :
617 : /**
618 : * os_exec - Execute an external program
619 : * @program: Path to the program
620 : * @arg: Command line argument string
621 : * @wait_completion: Whether to wait until the program execution completes
622 : * Returns: 0 on success, -1 on error
623 : */
624 : int os_exec(const char *program, const char *arg, int wait_completion);
625 :
626 :
627 : #ifdef OS_REJECT_C_LIB_FUNCTIONS
628 : #define malloc OS_DO_NOT_USE_malloc
629 : #define realloc OS_DO_NOT_USE_realloc
630 : #define free OS_DO_NOT_USE_free
631 : #define memcpy OS_DO_NOT_USE_memcpy
632 : #define memmove OS_DO_NOT_USE_memmove
633 : #define memset OS_DO_NOT_USE_memset
634 : #define memcmp OS_DO_NOT_USE_memcmp
635 : #undef strdup
636 : #define strdup OS_DO_NOT_USE_strdup
637 : #define strlen OS_DO_NOT_USE_strlen
638 : #define strcasecmp OS_DO_NOT_USE_strcasecmp
639 : #define strncasecmp OS_DO_NOT_USE_strncasecmp
640 : #undef strchr
641 : #define strchr OS_DO_NOT_USE_strchr
642 : #undef strcmp
643 : #define strcmp OS_DO_NOT_USE_strcmp
644 : #undef strncmp
645 : #define strncmp OS_DO_NOT_USE_strncmp
646 : #undef strncpy
647 : #define strncpy OS_DO_NOT_USE_strncpy
648 : #define strrchr OS_DO_NOT_USE_strrchr
649 : #define strstr OS_DO_NOT_USE_strstr
650 : #undef snprintf
651 : #define snprintf OS_DO_NOT_USE_snprintf
652 :
653 : #define strcpy OS_DO_NOT_USE_strcpy
654 : #endif /* OS_REJECT_C_LIB_FUNCTIONS */
655 :
656 :
657 : #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS)
658 : #define TEST_FAIL() testing_test_fail()
659 : int testing_test_fail(void);
660 : #else
661 : #define TEST_FAIL() 0
662 : #endif
663 :
664 : #endif /* OS_H */
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