acl_ea.h

来自「unxi下共享内存的使用」· C头文件 代码 · 共 45 行

/*
  File: linux/acl_ea.h

  (extended attribute representation of access control lists)

  (C) 2000 Andreas Gruenbacher, <[e-mail]>
*/
#ifndef _LINUX_ACL_EA_H
#define _LINUX_ACL_EA_H

#include <linux/posix_acl.h>

#define ACL_EA_ACCESS		"system.posix_acl_access"
#define ACL_EA_DEFAULT		"system.posix_acl_default"

#define ACL_EA_VERSION		0x0002

typedef struct {
	__u16		e_tag;
	__u16		e_perm;
	__u32		e_id;
} acl_ea_entry;

typedef struct {
	__u32		a_version;
	acl_ea_entry	a_entries[0];
} acl_ea_header;

static inline size_t acl_ea_size(int count)
{
	return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
}

static inline int acl_ea_count(size_t size)
{
	if (size < sizeof(acl_ea_header))
		return -1;
	size -= sizeof(acl_ea_header);
	if (size % sizeof(acl_ea_entry))
		return -1;
	return size / sizeof(acl_ea_entry);
}

#endif	/* _LINUX_ACL_EA_H */