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<minix/safecopies>

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Ben Gras 2006-06-20 14:25:42 +00:00
parent 7b6a1e5f59
commit ed9be75384
1 changed files with 68 additions and 0 deletions
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include/minix/safecopies.h Normal file
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#ifndef _MINIX_SAFECOPIES_H
#define _MINIX_SAFECOPIES_H 1
#include <minix/sys_config.h>
#include <sys/types.h>
#include <stdint.h>
typedef int32_t cp_grant_id_t;
typedef struct {
int cp_flags; /* CPF_* below */
union {
struct {
/* CPF_DIRECT */
endpoint_t cp_who_to; /* grantee */
vir_bytes cp_start; /* memory */
size_t cp_len; /* size in bytes */
char cp_reserved[8]; /* future use */
} cp_direct;
struct {
/* CPF_INDIRECT */
endpoint_t cp_who_to; /* grantee */
endpoint_t cp_who_from; /* previous granter */
cp_grant_id_t cp_grant; /* previous grant */
char cp_reserved[8];/* future use */
} cp_indirect;
struct {
/* CPF_MAGIC */
endpoint_t cp_who_from; /* granter */
endpoint_t cp_who_to; /* grantee */
vir_bytes cp_start; /* memory */
size_t cp_len; /* size in bytes */
char cp_reserved[8]; /* future use */
} cp_magic;
} cp_u;
char cp_reserved[8]; /* future use */
} cp_grant_t;
/* Invalid grant number. */
#define GRANT_INVALID -1
#define GRANT_VALID(g) ((g) > GRANT_INVALID)
/* Operations: any combination is ok. */
#define CPF_READ 0x000001 /* Granted process may read. */
#define CPF_WRITE 0x000002 /* Granted process may write. */
/* Internal flags. */
#define CPF_USED 0x000100 /* Grant slot in use. */
#define CPF_DIRECT 0x000200 /* Grant from this process to another. */
#define CPF_INDIRECT 0x000400 /* Grant from grant to another. */
#define CPF_MAGIC 0x000800 /* Grant from any to any. */
/* Prototypes for functions in libsys. */
_PROTOTYPE( cp_grant_id_t cpf_grant_direct, (endpoint_t, vir_bytes, size_t, int));
_PROTOTYPE( cp_grant_id_t cpf_grant_indirect, (endpoint_t, endpoint_t, cp_grant_id_t));
_PROTOTYPE( cp_grant_id_t cpf_grant_magic, (endpoint_t, endpoint_t, vir_bytes, size_t, int));
_PROTOTYPE( int cpf_revoke, (cp_grant_id_t grant_id));
_PROTOTYPE( int cpf_preallocate, (cp_grant_t *, int));
_PROTOTYPE( int cpf_lookup, (cp_grant_id_t g, endpoint_t *ep, endpoint_t *ep2));
/* Set a process' grant table location and size (in-kernel only). */
#define _K_SET_GRANT_TABLE(rp, ptr, entries) \
priv(rp)->s_grant_table= (ptr); \
priv(rp)->s_grant_entries= (entries);
#endif /* _MINIX_SAFECOPIES_H */