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Add a flag to grants system indicating a slot is VALID; so a slot

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can be reserved (USED), while toggling VALID on and off.
This commit is contained in:
Ben Gras
2006-06-27 12:19:45 +00:00
parent a587273c56
commit 607fb6bf7f
3 changed files with 19 additions and 5 deletions
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2
include/minix/safecopies.h
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@@ -62,6 +62,7 @@ struct vscp_vec {
#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. */
#define CPF_VALID 0x001000 /* Grant slot contains valid grant. */
/* Prototypes for functions in libsys. */
_PROTOTYPE( cp_grant_id_t cpf_grant_direct, (endpoint_t, vir_bytes, size_t, int));
@@ -78,6 +79,7 @@ _PROTOTYPE( int cpf_setgrant_indirect, (cp_grant_id_t g, endpoint_t who_to,
endpoint_t who_from, cp_grant_id_t his_g));
_PROTOTYPE( int cpf_setgrant_magic, (cp_grant_id_t g, endpoint_t who_to,
endpoint_t who_from, vir_bytes addr, size_t bytes, int access));
_PROTOTYPE( int cpf_setgrant_disable, (cp_grant_id_t grant_id));
/* Set a process' grant table location and size (in-kernel only). */
#define _K_SET_GRANT_TABLE(rp, ptr, entries) \