arch/s390/include/asm/vdso/getrandom.h

Source file repositories/reference/linux-study-clean/arch/s390/include/asm/vdso/getrandom.h

File Facts

System
Linux kernel
Corpus path
arch/s390/include/asm/vdso/getrandom.h
Extension
.h
Size
787 bytes
Lines
29
Domain
Architecture Layer
Bucket
arch/s390
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __ASM_VDSO_GETRANDOM_H
#define __ASM_VDSO_GETRANDOM_H

#ifndef __ASSEMBLER__

#include <vdso/datapage.h>
#include <asm/vdso/vsyscall.h>
#include <asm/syscall.h>
#include <asm/unistd.h>
#include <asm/page.h>

/**
 * getrandom_syscall - Invoke the getrandom() syscall.
 * @buffer:	Destination buffer to fill with random bytes.
 * @len:	Size of @buffer in bytes.
 * @flags:	Zero or more GRND_* flags.
 * Returns:	The number of random bytes written to @buffer, or a negative value indicating an error.
 */
static __always_inline ssize_t getrandom_syscall(void *buffer, size_t len, unsigned int flags)
{
	return syscall3(__NR_getrandom, (long)buffer, (long)len, (long)flags);
}

#endif /* !__ASSEMBLER__ */

#endif /* __ASM_VDSO_GETRANDOM_H */

Annotation

Implementation Notes