Benny Prijono | 0a749f1 | 2005-10-31 21:02:30 +0000 | [diff] [blame^] | 1 | /* $Header: /pjproject-0.3/pjlib/include/pj/compat/rand.h 3 10/14/05 12:26a Bennylp $ */
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| 2 | /* $Log: /pjproject-0.3/pjlib/include/pj/compat/rand.h $
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| 3 | *
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| 4 | * 3 10/14/05 12:26a Bennylp
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| 5 | * Finished error code framework, some fixes in ioqueue, etc. Pretty
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| 6 | * major.
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| 7 | *
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| 8 | * 2 9/21/05 1:39p Bennylp
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| 9 | * Periodic checkin for backup.
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| 10 | *
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| 11 | * 1 9/17/05 10:36a Bennylp
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| 12 | * Created.
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| 13 | *
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| 14 | */
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| 15 | #ifndef __PJ_COMPAT_RAND_H__
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| 16 | #define __PJ_COMPAT_RAND_H__
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| 17 |
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| 18 | /**
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| 19 | * @file rand.h
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| 20 | * @brief Provides platform_rand() and platform_srand() functions.
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| 21 | */
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| 22 |
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| 23 | #if defined(PJ_HAS_STDLIB_H) && PJ_HAS_STDLIB_H != 0
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| 24 | /*
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| 25 | * Use stdlib based rand() and srand().
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| 26 | */
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| 27 | # include <stdlib.h>
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| 28 | # define platform_srand srand
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| 29 | # if defined(RAND_MAX) && RAND_MAX <= 0xFFFF
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| 30 | /*
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| 31 | * When rand() is only 16 bit strong, double the strength
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| 32 | * by calling it twice!
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| 33 | */
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| 34 | PJ_INLINE(int) platform_rand(void)
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| 35 | {
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| 36 | return ((rand() & 0xFFFF) << 16) | (rand() & 0xFFFF);
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| 37 | }
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| 38 | # else
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| 39 | # define platform_rand rand
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| 40 | # endif
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| 41 |
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| 42 | #elif defined(PJ_LINUX_KERNEL) && PJ_LINUX_KERNEL != 0
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| 43 | /*
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| 44 | * Linux kernel mode random number generator.
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| 45 | */
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| 46 | # include <linux/random.h>
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| 47 | # define platform_srand(seed)
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| 48 |
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| 49 | PJ_INLINE(int) platform_rand(void)
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| 50 | {
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| 51 | int value;
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| 52 | get_random_bytes((void*)&value, sizeof(value));
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| 53 | return value;
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| 54 | }
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| 55 |
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| 56 | #else
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| 57 | # warning "platform_rand() is not implemented"
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| 58 | # define platform_rand() 1
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| 59 | # define platform_srand(seed)
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| 60 |
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| 61 | #endif
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| 62 |
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| 63 |
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| 64 | #endif /* __PJ_COMPAT_RAND_H__ */
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| 65 |
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