diff options
Diffstat (limited to 'src/utils/os.h')
| -rw-r--r-- | src/utils/os.h | 158 |
1 files changed, 134 insertions, 24 deletions
diff --git a/src/utils/os.h b/src/utils/os.h index ad208341fa94..77250d6371c9 100644 --- a/src/utils/os.h +++ b/src/utils/os.h @@ -23,6 +23,11 @@ struct os_time { os_time_t usec; }; +struct os_reltime { + os_time_t sec; + os_time_t usec; +}; + /** * os_get_time - Get current time (sec, usec) * @t: Pointer to buffer for the time @@ -30,21 +35,84 @@ struct os_time { */ int os_get_time(struct os_time *t); +/** + * os_get_reltime - Get relative time (sec, usec) + * @t: Pointer to buffer for the time + * Returns: 0 on success, -1 on failure + */ +int os_get_reltime(struct os_reltime *t); + + +/* Helpers for handling struct os_time */ + +static inline int os_time_before(struct os_time *a, struct os_time *b) +{ + return (a->sec < b->sec) || + (a->sec == b->sec && a->usec < b->usec); +} + + +static inline void os_time_sub(struct os_time *a, struct os_time *b, + struct os_time *res) +{ + res->sec = a->sec - b->sec; + res->usec = a->usec - b->usec; + if (res->usec < 0) { + res->sec--; + res->usec += 1000000; + } +} + + +/* Helpers for handling struct os_reltime */ + +static inline int os_reltime_before(struct os_reltime *a, + struct os_reltime *b) +{ + return (a->sec < b->sec) || + (a->sec == b->sec && a->usec < b->usec); +} + + +static inline void os_reltime_sub(struct os_reltime *a, struct os_reltime *b, + struct os_reltime *res) +{ + res->sec = a->sec - b->sec; + res->usec = a->usec - b->usec; + if (res->usec < 0) { + res->sec--; + res->usec += 1000000; + } +} + + +static inline void os_reltime_age(struct os_reltime *start, + struct os_reltime *age) +{ + struct os_reltime now; + + os_get_reltime(&now); + os_reltime_sub(&now, start, age); +} + + +static inline int os_reltime_expired(struct os_reltime *now, + struct os_reltime *ts, + os_time_t timeout_secs) +{ + struct os_reltime age; + + os_reltime_sub(now, ts, &age); + return (age.sec > timeout_secs) || + (age.sec == timeout_secs && age.usec > 0); +} -/* Helper macros for handling struct os_time */ -#define os_time_before(a, b) \ - ((a)->sec < (b)->sec || \ - ((a)->sec == (b)->sec && (a)->usec < (b)->usec)) +static inline int os_reltime_initialized(struct os_reltime *t) +{ + return t->sec != 0 || t->usec != 0; +} -#define os_time_sub(a, b, res) do { \ - (res)->sec = (a)->sec - (b)->sec; \ - (res)->usec = (a)->usec - (b)->usec; \ - if ((res)->usec < 0) { \ - (res)->sec--; \ - (res)->usec += 1000000; \ - } \ -} while (0) /** * os_mktime - Convert broken-down time into seconds since 1970-01-01 @@ -172,6 +240,13 @@ int os_unsetenv(const char *name); char * os_readfile(const char *name, size_t *len); /** + * os_file_exists - Check whether the specified file exists + * @fname: Path and name of the file + * Returns: 1 if the file exists or 0 if not + */ +int os_file_exists(const char *fname); + +/** * os_zalloc - Allocate and zero memory * @size: Number of bytes to allocate * Returns: Pointer to allocated and zeroed memory or %NULL on failure @@ -361,15 +436,6 @@ int os_strcmp(const char *s1, const char *s2); int os_strncmp(const char *s1, const char *s2, size_t n); /** - * os_strncpy - Copy a string - * @dest: Destination - * @src: Source - * @n: Maximum number of characters to copy - * Returns: dest - */ -char * os_strncpy(char *dest, const char *src, size_t n); - -/** * os_strstr - Locate a substring * @haystack: String (haystack) to search from * @needle: Needle to search from haystack @@ -465,9 +531,6 @@ char * os_strdup(const char *s); #ifndef os_strncmp #define os_strncmp(s1, s2, n) strncmp((s1), (s2), (n)) #endif -#ifndef os_strncpy -#define os_strncpy(d, s, n) strncpy((d), (s), (n)) -#endif #ifndef os_strrchr #define os_strrchr(s, c) strrchr((s), (c)) #endif @@ -486,6 +549,12 @@ char * os_strdup(const char *s); #endif /* OS_NO_C_LIB_DEFINES */ +static inline int os_snprintf_error(size_t size, int res) +{ + return res < 0 || (unsigned int) res >= size; +} + + static inline void * os_realloc_array(void *ptr, size_t nmemb, size_t size) { if (size && nmemb > (~(size_t) 0) / size) @@ -493,6 +562,21 @@ static inline void * os_realloc_array(void *ptr, size_t nmemb, size_t size) return os_realloc(ptr, nmemb * size); } +/** + * os_remove_in_array - Remove a member from an array by index + * @ptr: Pointer to the array + * @nmemb: Current member count of the array + * @size: The size per member of the array + * @idx: Index of the member to be removed + */ +static inline void os_remove_in_array(void *ptr, size_t nmemb, size_t size, + size_t idx) +{ + if (idx < nmemb - 1) + os_memmove(((unsigned char *) ptr) + idx * size, + ((unsigned char *) ptr) + (idx + 1) * size, + (nmemb - idx - 1) * size); +} /** * os_strlcpy - Copy a string with size bound and NUL-termination @@ -506,6 +590,32 @@ static inline void * os_realloc_array(void *ptr, size_t nmemb, size_t size) */ size_t os_strlcpy(char *dest, const char *src, size_t siz); +/** + * os_memcmp_const - Constant time memory comparison + * @a: First buffer to compare + * @b: Second buffer to compare + * @len: Number of octets to compare + * Returns: 0 if buffers are equal, non-zero if not + * + * This function is meant for comparing passwords or hash values where + * difference in execution time could provide external observer information + * about the location of the difference in the memory buffers. The return value + * does not behave like os_memcmp(), i.e., os_memcmp_const() cannot be used to + * sort items into a defined order. Unlike os_memcmp(), execution time of + * os_memcmp_const() does not depend on the contents of the compared memory + * buffers, but only on the total compared length. + */ +int os_memcmp_const(const void *a, const void *b, size_t len); + +/** + * os_exec - Execute an external program + * @program: Path to the program + * @arg: Command line argument string + * @wait_completion: Whether to wait until the program execution completes + * Returns: 0 on success, -1 on error + */ +int os_exec(const char *program, const char *arg, int wait_completion); + #ifdef OS_REJECT_C_LIB_FUNCTIONS #define malloc OS_DO_NOT_USE_malloc |