stuff

kernel/syscalls/handle.c

@@ -0,0 +1,48 @@
+#include <zinnia/handle.h>
+#include <zinnia/rights.h>
+#include <zinnia/status.h>
+#include <kernel/namespace.h>
+#include <kernel/percpu.h>
+#include <kernel/syscalls.h>
+#include <kernel/usercopy.h>
+
+zn_status_t syscall_handle_clone(struct arch_context* ctx) {
+    zn_handle_t handle = ctx->ARCH_CTX_A0;
+    zn_rights_t cloned_rights = ctx->ARCH_CTX_A1;
+    __user zn_handle_t* cloned = (__user zn_handle_t*)ctx->ARCH_CTX_A2;
+
+    struct task* current = percpu_get()->sched.current;
+    struct namespace* ns = current->namespace;
+
+    struct namespace_desc desc;
+    zn_status_t status = namespace_get(ns, handle, &desc);
+    if (status != ZN_OK)
+        return status;
+
+    zn_handle_t new_handle;
+    status = namespace_clone_desc(ns, &desc, cloned_rights, &new_handle);
+    if (status != ZN_OK)
+        return status;
+
+    if (!usercopy_write(cloned, &new_handle, sizeof(new_handle))) {
+        namespace_del_desc(ns, new_handle);
+        return ZN_ERR_BAD_BUFFER;
+    }
+
+    return ZN_OK;
+}
+
+zn_status_t syscall_handle_drop(struct arch_context* ctx) {
+    zn_handle_t handle = ctx->ARCH_CTX_A0;
+    struct task* current = percpu_get()->sched.current;
+
+    return namespace_del_desc(current->namespace, handle);
+}
+
+zn_status_t syscall_handle_validate(struct arch_context* ctx) {
+    zn_handle_t handle = ctx->ARCH_CTX_A0;
+    struct task* current = percpu_get()->sched.current;
+
+    struct namespace_desc desc;
+    return namespace_get(current->namespace, handle, &desc);
+}