116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
#include <zinnia/handle.h>
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#include <zinnia/rights.h>
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#include <zinnia/status.h>
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#include <kernel/alloc.h>
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#include <kernel/namespace.h>
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#include <stdatomic.h>
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zn_status_t namespace_new(struct namespace** out) {
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if (!out)
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return ZN_ERR_INTERNAL;
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struct namespace* namespace = mem_alloc(sizeof(struct namespace), 0);
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if (!namespace)
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return ZN_ERR_NO_MEMORY;
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namespace->mutex = (struct mutex){0};
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namespace->next_handle = 1;
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hashmap_init(&namespace->descriptors);
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*out = namespace;
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return ZN_OK;
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}
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zn_status_t namespace_add_desc(struct namespace* namespace, struct namespace_desc desc, zn_handle_t* out) {
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if (!namespace)
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return ZN_ERR_INTERNAL;
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// Skip over handles that are already in use (e.g. hard-coded handles).
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zn_handle_t handle;
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do {
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handle = atomic_fetch_add_explicit(&namespace->next_handle, 1, memory_order_acq_rel);
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if (handle <= ZN_HANDLE_INVALID)
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continue;
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} while (hashmap_get(&namespace->descriptors, handle, hashmap_hash_default, hashmap_eq_default) != nullptr);
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zn_status_t status =
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hashmap_insert(&namespace->descriptors, handle, desc, hashmap_hash_default, hashmap_eq_default);
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if (status != ZN_OK)
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return status;
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*out = handle;
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return ZN_OK;
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}
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zn_status_t namespace_add_desc_at(struct namespace* namespace, struct namespace_desc desc, zn_handle_t handle) {
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if (!namespace)
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return ZN_ERR_INTERNAL;
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if (handle <= ZN_HANDLE_INVALID)
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return ZN_ERR_BAD_HANDLE;
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// Fail if a descriptor already exists at this handle.
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if (hashmap_get(&namespace->descriptors, handle, hashmap_hash_default, hashmap_eq_default) != nullptr)
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return ZN_ERR_ALREADY_EXISTS;
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return hashmap_insert(&namespace->descriptors, handle, desc, hashmap_hash_default, hashmap_eq_default);
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}
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zn_status_t namespace_get(struct namespace* namespace, zn_handle_t handle, struct namespace_desc* out) {
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if (!namespace)
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return ZN_ERR_INTERNAL;
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if (!out)
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return ZN_ERR_INTERNAL;
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if (handle <= ZN_HANDLE_INVALID)
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return ZN_ERR_BAD_HANDLE;
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struct namespace_desc* desc =
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hashmap_get(&namespace->descriptors, handle, hashmap_hash_default, hashmap_eq_default);
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if (!desc)
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return ZN_ERR_BAD_HANDLE;
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*out = *desc;
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return ZN_OK;
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}
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zn_status_t namespace_del_desc(struct namespace* namespace, zn_handle_t handle) {
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if (!namespace)
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return ZN_ERR_INTERNAL;
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if (handle <= ZN_HANDLE_INVALID)
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return ZN_ERR_BAD_HANDLE;
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if (!hashmap_remove(&namespace->descriptors, handle, hashmap_hash_default, hashmap_eq_default))
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return ZN_ERR_BAD_HANDLE;
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return ZN_OK;
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}
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zn_status_t namespace_clone_desc(
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struct namespace* ns,
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struct namespace_desc* desc,
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zn_rights_t cloned_rights,
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zn_handle_t* out
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) {
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// The source handle must have the clone right.
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if (!(desc->rights & ZN_RIGHT_CLONE))
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return ZN_ERR_BAD_PERMS;
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// Determine the rights for the cloned handle.
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zn_rights_t new_rights;
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if (cloned_rights & ZN_RIGHTS_IDENTICAL) {
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new_rights = desc->rights;
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} else {
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// The requested rights must be a subset of the original rights.
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if (cloned_rights & ~desc->rights)
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return ZN_ERR_BAD_PERMS;
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new_rights = cloned_rights;
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}
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// Create the cloned descriptor.
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struct namespace_desc new_desc = *desc;
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new_desc.rights = new_rights;
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return namespace_add_desc(ns, new_desc, out);
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}
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