getrandom.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2
 3#ifndef __ASM_VDSO_GETRANDOM_H
 4#define __ASM_VDSO_GETRANDOM_H
 5
 6#ifndef __ASSEMBLER__
 7
 8#include <vdso/datapage.h>
 9#include <asm/vdso/vsyscall.h>
10#include <asm/syscall.h>
11#include <asm/unistd.h>
12#include <asm/page.h>
13
14/**
15 * getrandom_syscall - Invoke the getrandom() syscall.
16 * @buffer:	Destination buffer to fill with random bytes.
17 * @len:	Size of @buffer in bytes.
18 * @flags:	Zero or more GRND_* flags.
19 * Returns:	The number of random bytes written to @buffer, or a negative value indicating an error.
20 */
21static __always_inline ssize_t getrandom_syscall(void *buffer, size_t len, unsigned int flags)
22{
23	return syscall3(__NR_getrandom, (long)buffer, (long)len, (long)flags);
24}
25
26#endif /* !__ASSEMBLER__ */
27
28#endif /* __ASM_VDSO_GETRANDOM_H */