include/linux/uuid.h

Source file repositories/reference/linux-study-clean/include/linux/uuid.h

File Facts

System
Linux kernel
Corpus path
include/linux/uuid.h
Extension
.h
Size
2548 bytes
Lines
111
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _LINUX_UUID_H_
#define _LINUX_UUID_H_

#include <linux/string.h>

#define UUID_SIZE 16

typedef struct {
	__u8 b[UUID_SIZE];
} guid_t;

typedef struct {
	__u8 b[UUID_SIZE];
} uuid_t;

#define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)			\
((guid_t)								\
{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
   (b) & 0xff, ((b) >> 8) & 0xff,					\
   (c) & 0xff, ((c) >> 8) & 0xff,					\
   (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})

#define UUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)			\
((uuid_t)								\
{{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \
   ((b) >> 8) & 0xff, (b) & 0xff,					\
   ((c) >> 8) & 0xff, (c) & 0xff,					\
   (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})

/*
 * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
 * not including trailing NUL.
 */
#define	UUID_STRING_LEN		36

extern const guid_t guid_null;
extern const uuid_t uuid_null;

static inline bool guid_equal(const guid_t *u1, const guid_t *u2)
{
	return memcmp(u1, u2, sizeof(guid_t)) == 0;
}

static inline void guid_copy(guid_t *dst, const guid_t *src)
{
	memcpy(dst, src, sizeof(guid_t));
}

static inline void import_guid(guid_t *dst, const __u8 *src)
{
	memcpy(dst, src, sizeof(guid_t));
}

static inline void export_guid(__u8 *dst, const guid_t *src)
{
	memcpy(dst, src, sizeof(guid_t));
}

static inline bool guid_is_null(const guid_t *guid)
{
	return guid_equal(guid, &guid_null);
}

static inline bool uuid_equal(const uuid_t *u1, const uuid_t *u2)
{
	return memcmp(u1, u2, sizeof(uuid_t)) == 0;
}

static inline void uuid_copy(uuid_t *dst, const uuid_t *src)
{
	memcpy(dst, src, sizeof(uuid_t));
}

static inline void import_uuid(uuid_t *dst, const __u8 *src)
{
	memcpy(dst, src, sizeof(uuid_t));
}

static inline void export_uuid(__u8 *dst, const uuid_t *src)
{
	memcpy(dst, src, sizeof(uuid_t));
}

static inline bool uuid_is_null(const uuid_t *uuid)
{
	return uuid_equal(uuid, &uuid_null);
}

void generate_random_uuid(unsigned char uuid[16]);
void generate_random_guid(unsigned char guid[16]);

Annotation

Implementation Notes