2 * OS specific functions
3 * Copyright (c) 2005-2009, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
12 typedef long os_time_t;
15 * os_sleep - Sleep (sec, usec)
16 * @sec: Number of seconds to sleep
17 * @usec: Number of microseconds to sleep
19 void os_sleep(os_time_t sec, os_time_t usec);
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
36 int os_get_time(struct os_time *t);
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
43 int os_get_reltime(struct os_reltime *t);
46 /* Helpers for handling struct os_time */
48 static inline int os_time_before(struct os_time *a, struct os_time *b)
50 return (a->sec < b->sec) ||
51 (a->sec == b->sec && a->usec < b->usec);
55 static inline void os_time_sub(struct os_time *a, struct os_time *b,
58 res->sec = a->sec - b->sec;
59 res->usec = a->usec - b->usec;
67 /* Helpers for handling struct os_reltime */
69 static inline int os_reltime_before(struct os_reltime *a,
72 return (a->sec < b->sec) ||
73 (a->sec == b->sec && a->usec < b->usec);
77 static inline void os_reltime_sub(struct os_reltime *a, struct os_reltime *b,
78 struct os_reltime *res)
80 res->sec = a->sec - b->sec;
81 res->usec = a->usec - b->usec;
89 static inline void os_reltime_age(struct os_reltime *start,
90 struct os_reltime *age)
92 struct os_reltime now;
95 os_reltime_sub(&now, start, age);
99 static inline int os_reltime_expired(struct os_reltime *now,
100 struct os_reltime *ts,
101 os_time_t timeout_secs)
103 struct os_reltime age;
105 os_reltime_sub(now, ts, &age);
106 return (age.sec > timeout_secs) ||
107 (age.sec == timeout_secs && age.usec > 0);
111 static inline int os_reltime_initialized(struct os_reltime *t)
113 return t->sec != 0 || t->usec != 0;
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
129 * Note: The result is in seconds from Epoch, i.e., in UTC, not in local time
130 * which is used by POSIX mktime().
132 int os_mktime(int year, int month, int day, int hour, int min, int sec,
136 int sec; /* 0..59 or 60 for leap seconds */
138 int hour; /* 0..23 */
140 int month; /* 1..12 */
141 int year; /* Four digit year */
144 int os_gmtime(os_time_t t, struct os_tm *tm);
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
151 int os_daemonize(const char *pid_file);
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
157 void os_daemonize_terminate(const char *pid_file);
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
165 int os_get_random(unsigned char *buf, size_t len);
168 * os_random - Get pseudo random value (not necessarily very strong)
169 * Returns: Pseudo random value
171 unsigned long os_random(void);
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
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.
186 char * os_rel2abs_path(const char *rel_path);
189 * os_program_init - Program initialization (called at start)
190 * Returns: 0 on success, -1 on failure
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.
196 int os_program_init(void);
199 * os_program_deinit - Program deinitialization (called just before exit)
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
206 void os_program_deinit(void);
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
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.
218 int os_setenv(const char *name, const char *value, int overwrite);
221 * os_unsetenv - Delete environent variable
222 * @name: Name of the variable
223 * Returns: 0 on success, -1 on error
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.
228 int os_unsetenv(const char *name);
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
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().
240 char * os_readfile(const char *name, size_t *len);
243 * os_zalloc - Allocate and zero memory
244 * @size: Number of bytes to allocate
245 * Returns: Pointer to allocated and zeroed memory or %NULL on failure
247 * Caller is responsible for freeing the returned buffer with os_free().
249 void * os_zalloc(size_t size);
252 * os_calloc - Allocate and zero memory for an array
253 * @nmemb: Number of members in the array
254 * @size: Number of bytes in each member
255 * Returns: Pointer to allocated and zeroed memory or %NULL on failure
257 * This function can be used as a wrapper for os_zalloc(nmemb * size) when an
258 * allocation is used for an array. The main benefit over os_zalloc() is in
259 * having an extra check to catch integer overflows in multiplication.
261 * Caller is responsible for freeing the returned buffer with os_free().
263 static inline void * os_calloc(size_t nmemb, size_t size)
265 if (size && nmemb > (~(size_t) 0) / size)
267 return os_zalloc(nmemb * size);
272 * The following functions are wrapper for standard ANSI C or POSIX functions.
273 * By default, they are just defined to use the standard function name and no
274 * os_*.c implementation is needed for them. This avoids extra function calls
275 * by allowing the C pre-processor take care of the function name mapping.
277 * If the target system uses a C library that does not provide these functions,
278 * build_config.h can be used to define the wrappers to use a different
279 * function name. This can be done on function-by-function basis since the
280 * defines here are only used if build_config.h does not define the os_* name.
281 * If needed, os_*.c file can be used to implement the functions that are not
282 * included in the C library on the target system. Alternatively,
283 * OS_NO_C_LIB_DEFINES can be defined to skip all defines here in which case
284 * these functions need to be implemented in os_*.c file for the target system.
287 #ifdef OS_NO_C_LIB_DEFINES
290 * os_malloc - Allocate dynamic memory
291 * @size: Size of the buffer to allocate
292 * Returns: Allocated buffer or %NULL on failure
294 * Caller is responsible for freeing the returned buffer with os_free().
296 void * os_malloc(size_t size);
299 * os_realloc - Re-allocate dynamic memory
300 * @ptr: Old buffer from os_malloc() or os_realloc()
301 * @size: Size of the new buffer
302 * Returns: Allocated buffer or %NULL on failure
304 * Caller is responsible for freeing the returned buffer with os_free().
305 * If re-allocation fails, %NULL is returned and the original buffer (ptr) is
306 * not freed and caller is still responsible for freeing it.
308 void * os_realloc(void *ptr, size_t size);
311 * os_free - Free dynamic memory
312 * @ptr: Old buffer from os_malloc() or os_realloc(); can be %NULL
314 void os_free(void *ptr);
317 * os_memcpy - Copy memory area
320 * @n: Number of bytes to copy
323 * The memory areas src and dst must not overlap. os_memmove() can be used with
324 * overlapping memory.
326 void * os_memcpy(void *dest, const void *src, size_t n);
329 * os_memmove - Copy memory area
332 * @n: Number of bytes to copy
335 * The memory areas src and dst may overlap.
337 void * os_memmove(void *dest, const void *src, size_t n);
340 * os_memset - Fill memory with a constant byte
341 * @s: Memory area to be filled
343 * @n: Number of bytes started from s to fill with c
346 void * os_memset(void *s, int c, size_t n);
349 * os_memcmp - Compare memory areas
352 * @n: Maximum numbers of octets to compare
353 * Returns: An integer less than, equal to, or greater than zero if s1 is
354 * found to be less than, to match, or be greater than s2. Only first n
355 * characters will be compared.
357 int os_memcmp(const void *s1, const void *s2, size_t n);
360 * os_strdup - Duplicate a string
362 * Returns: Allocated buffer with the string copied into it or %NULL on failure
364 * Caller is responsible for freeing the returned buffer with os_free().
366 char * os_strdup(const char *s);
369 * os_strlen - Calculate the length of a string
370 * @s: '\0' terminated string
371 * Returns: Number of characters in s (not counting the '\0' terminator)
373 size_t os_strlen(const char *s);
376 * os_strcasecmp - Compare two strings ignoring case
379 * Returns: An integer less than, equal to, or greater than zero if s1 is
380 * found to be less than, to match, or be greatred than s2
382 int os_strcasecmp(const char *s1, const char *s2);
385 * os_strncasecmp - Compare two strings ignoring case
388 * @n: Maximum numbers of characters to compare
389 * Returns: An integer less than, equal to, or greater than zero if s1 is
390 * found to be less than, to match, or be greater than s2. Only first n
391 * characters will be compared.
393 int os_strncasecmp(const char *s1, const char *s2, size_t n);
396 * os_strchr - Locate the first occurrence of a character in string
398 * @c: Character to search for
399 * Returns: Pointer to the matched character or %NULL if not found
401 char * os_strchr(const char *s, int c);
404 * os_strrchr - Locate the last occurrence of a character in string
406 * @c: Character to search for
407 * Returns: Pointer to the matched character or %NULL if not found
409 char * os_strrchr(const char *s, int c);
412 * os_strcmp - Compare two strings
415 * Returns: An integer less than, equal to, or greater than zero if s1 is
416 * found to be less than, to match, or be greatred than s2
418 int os_strcmp(const char *s1, const char *s2);
421 * os_strncmp - Compare two strings
424 * @n: Maximum numbers of characters to compare
425 * Returns: An integer less than, equal to, or greater than zero if s1 is
426 * found to be less than, to match, or be greater than s2. Only first n
427 * characters will be compared.
429 int os_strncmp(const char *s1, const char *s2, size_t n);
432 * os_strstr - Locate a substring
433 * @haystack: String (haystack) to search from
434 * @needle: Needle to search from haystack
435 * Returns: Pointer to the beginning of the substring or %NULL if not found
437 char * os_strstr(const char *haystack, const char *needle);
440 * os_snprintf - Print to a memory buffer
441 * @str: Memory buffer to print into
442 * @size: Maximum length of the str buffer
443 * @format: printf format
444 * Returns: Number of characters printed (not including trailing '\0').
446 * If the output buffer is truncated, number of characters which would have
447 * been written is returned. Since some C libraries return -1 in such a case,
448 * the caller must be prepared on that value, too, to indicate truncation.
450 * Note: Some C library implementations of snprintf() may not guarantee null
451 * termination in case the output is truncated. The OS wrapper function of
452 * os_snprintf() should provide this guarantee, i.e., to null terminate the
453 * output buffer if a C library version of the function is used and if that
454 * function does not guarantee null termination.
456 * If the target system does not include snprintf(), see, e.g.,
457 * http://www.ijs.si/software/snprintf/ for an example of a portable
458 * implementation of snprintf.
460 int os_snprintf(char *str, size_t size, const char *format, ...);
462 #else /* OS_NO_C_LIB_DEFINES */
465 void * os_malloc(size_t size);
466 void * os_realloc(void *ptr, size_t size);
467 void os_free(void *ptr);
468 char * os_strdup(const char *s);
469 #else /* WPA_TRACE */
471 #define os_malloc(s) malloc((s))
474 #define os_realloc(p, s) realloc((p), (s))
477 #define os_free(p) free((p))
481 #define os_strdup(s) _strdup(s)
483 #define os_strdup(s) strdup(s)
486 #endif /* WPA_TRACE */
489 #define os_memcpy(d, s, n) memcpy((d), (s), (n))
492 #define os_memmove(d, s, n) memmove((d), (s), (n))
495 #define os_memset(s, c, n) memset(s, c, n)
498 #define os_memcmp(s1, s2, n) memcmp((s1), (s2), (n))
502 #define os_strlen(s) strlen(s)
504 #ifndef os_strcasecmp
506 #define os_strcasecmp(s1, s2) _stricmp((s1), (s2))
508 #define os_strcasecmp(s1, s2) strcasecmp((s1), (s2))
511 #ifndef os_strncasecmp
513 #define os_strncasecmp(s1, s2, n) _strnicmp((s1), (s2), (n))
515 #define os_strncasecmp(s1, s2, n) strncasecmp((s1), (s2), (n))
519 #define os_strchr(s, c) strchr((s), (c))
522 #define os_strcmp(s1, s2) strcmp((s1), (s2))
525 #define os_strncmp(s1, s2, n) strncmp((s1), (s2), (n))
528 #define os_strrchr(s, c) strrchr((s), (c))
531 #define os_strstr(h, n) strstr((h), (n))
536 #define os_snprintf _snprintf
538 #define os_snprintf snprintf
542 #endif /* OS_NO_C_LIB_DEFINES */
545 static inline void * os_realloc_array(void *ptr, size_t nmemb, size_t size)
547 if (size && nmemb > (~(size_t) 0) / size)
549 return os_realloc(ptr, nmemb * size);
554 * os_strlcpy - Copy a string with size bound and NUL-termination
557 * @siz: Size of the target buffer
558 * Returns: Total length of the target string (length of src) (not including
561 * This function matches in behavior with the strlcpy(3) function in OpenBSD.
563 size_t os_strlcpy(char *dest, const char *src, size_t siz);
566 #ifdef OS_REJECT_C_LIB_FUNCTIONS
567 #define malloc OS_DO_NOT_USE_malloc
568 #define realloc OS_DO_NOT_USE_realloc
569 #define free OS_DO_NOT_USE_free
570 #define memcpy OS_DO_NOT_USE_memcpy
571 #define memmove OS_DO_NOT_USE_memmove
572 #define memset OS_DO_NOT_USE_memset
573 #define memcmp OS_DO_NOT_USE_memcmp
575 #define strdup OS_DO_NOT_USE_strdup
576 #define strlen OS_DO_NOT_USE_strlen
577 #define strcasecmp OS_DO_NOT_USE_strcasecmp
578 #define strncasecmp OS_DO_NOT_USE_strncasecmp
580 #define strchr OS_DO_NOT_USE_strchr
582 #define strcmp OS_DO_NOT_USE_strcmp
584 #define strncmp OS_DO_NOT_USE_strncmp
586 #define strncpy OS_DO_NOT_USE_strncpy
587 #define strrchr OS_DO_NOT_USE_strrchr
588 #define strstr OS_DO_NOT_USE_strstr
590 #define snprintf OS_DO_NOT_USE_snprintf
592 #define strcpy OS_DO_NOT_USE_strcpy
593 #endif /* OS_REJECT_C_LIB_FUNCTIONS */