1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*
* include/linux/random.h
*
* Include file for the random number generator.
*/
#ifndef _LINUX_RANDOM_H
#define _LINUX_RANDOM_H
#include <unistd.h>
#include <sys/syscall.h>
#include <linux/bug.h>
#ifdef __NR_getrandom
static inline int getrandom(void *buf, size_t buflen, unsigned int flags)
{
return syscall(SYS_getrandom, buf, buflen, flags);
}
#else
extern int urandom_fd;
static inline int getrandom(void *buf, size_t buflen, unsigned int flags)
{
return read(urandom_fd, buf, buflen);
}
#endif
static inline void get_random_bytes(void *buf, int nbytes)
{
BUG_ON(getrandom(buf, nbytes, 0) != nbytes);
}
static inline int get_random_int(void)
{
int v;
get_random_bytes(&v, sizeof(v));
return v;
}
static inline long get_random_long(void)
{
long v;
get_random_bytes(&v, sizeof(v));
return v;
}
#endif /* _LINUX_RANDOM_H */
|
