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/*
* 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);
}
#define get_random_type(type) \
static inline type get_random_##type(void) \
{ \
type v; \
\
get_random_bytes(&v, sizeof(v)); \
return v; \
}
get_random_type(int);
get_random_type(long);
get_random_type(u64);
#endif /* _LINUX_RANDOM_H */
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