From 548506392b789f58b1556a6ffca917441e1d89fd Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Tue, 13 Oct 2026 22:31:43 -0400
Subject: ipc functions. work on process spawning

---
 sys/syscall_objdir.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 94 insertions(+), 1 deletion(-)

(limited to 'sys/syscall_objdir.c')

diff --git a/sys/syscall_objdir.c b/sys/syscall_objdir.c
index 9243af1..199cbab 100644
--- a/sys/syscall_objdir.c
+++ b/sys/syscall_objdir.c
@@ -2,6 +2,7 @@
 #include "proc/process.h"
 #include "jove.h"
 #include "lib/printf.h"
+#include "sys/objdir.h"
 #include "syscall.h"
 
 int
@@ -16,7 +17,7 @@ s_syscall_objdir_objtype(
 
     uint16_t local_idx = *((uint16_t*)payload_data);
 
-    if(local_idx > JOVE_OBJDIR_ENTRIES) {
+    if(local_idx > OBJDIR_ENTRIES) {
         kprintf("%s: Object index is out of bounds (>= 512)\n", __func__);
         return EOOB;
     }
@@ -25,6 +26,85 @@ s_syscall_objdir_objtype(
     return obj_peektype(local_obj);
 }
 
+static int
+s_syscall_objdir_swap(jove_owned_obj_t *target_obj,
+        lockstack_t *lockstack,
+        jove_owned_obj_t *rootdir,
+        size_t bytes_left,
+        void *payload_data)
+{
+    size_t bytes_needed = sizeof(struct syscall_objdir_swap);
+    CHECK_TOOSMALL(bytes_needed, bytes_left, "Message too small for payload.");
+
+    struct syscall_objdir_swap *payload = payload_data;
+    bytes_needed += payload->other_path_length * sizeof(objpath_part_t);
+    CHECK_TOOSMALL(bytes_needed, bytes_left, "Message too small for other path.");
+
+    jove_owned_obj_t *obj_a = lockstack_push(lockstack, objdir_trygetlocal(target_obj, payload->index));
+    if(obj_a == NULL) {
+        klogf("Getting local object %i failed : %s\n",
+                payload->index, errstr(errno));
+        return -errno;
+    }
+    jove_perm_obj_t objdir_b = link_try_traverse_objdir(rootdir, lockstack,
+            payload->other_path_length - 1, payload->other_path);
+    if(objdir_b.obj == NULL) {
+        klogf("Getting object %P failed : %s\n",
+                payload->other_path, payload->other_path_length, errstr(errno));
+        return -errno;
+    }
+
+    CHECK_OBJPERM(objdir_b, SYSCALL_PERM_OBJDIR_SWAP_TGT, "Other object is missing permission");
+    jove_owned_obj_t *obj_b = lockstack_push(lockstack, 
+            objdir_trygetlocal(objdir_b.obj, payload->other_path[payload->other_path_length-1]));
+    if(obj_b == NULL) {
+        klogf("Getting object %P failed : %s\n",
+                payload->other_path, payload->other_path_length, errstr(errno));
+        return -errno;
+    }
+
+    objdir_swapobj(obj_a, obj_b);
+    return 0;
+}
+
+static int
+s_syscall_objdir_link(jove_owned_obj_t *target_obj,
+        lockstack_t *lockstack,
+        jove_owned_obj_t *rootdir_obj,
+        size_t bytes_left,
+        void *payload_data)
+{
+    size_t bytes_needed = sizeof(struct syscall_objdir_link);
+    CHECK_TOOSMALL(bytes_needed, bytes_left, "Message too small for payload");
+
+    struct syscall_objdir_link *payload = payload_data;
+    bytes_needed += payload->other_path_length * sizeof(objpath_part_t);
+    CHECK_TOOSMALL(bytes_needed, bytes_left, "Message too small for other object");
+
+    jove_owned_obj_t *link_obj = lockstack_push(lockstack, objdir_trygetlocal(target_obj, payload->index));
+    if(link_obj == NULL) {
+        klogf("Getting local object %i failed : %s\n", payload->index, errstr(errno));
+        return -errno;
+    }
+    CHECK_OBJTYPE(link_obj, JOVE_OBJ_LINK, "Local object is not a link object");
+    
+    jove_perm_obj_t dest_obj = link_try_traverse_objdir(rootdir_obj, lockstack,
+            payload->other_path_length, payload->other_path);
+    if(dest_obj.obj == NULL) {
+        klogf("Getting destination object %P failed : %s\n",
+                payload->other_path, payload->other_path_length, errstr(errno));
+        return -errno;
+    }
+    
+    if(obj_gettype(dest_obj.obj) != JOVE_OBJ_NONE) {
+        klogf("Destination object %P is not empty\n",
+                payload->other_path, payload->other_path_length);
+        return -EFULL;
+    }
+    CHECK_OBJPERM(dest_obj, SYSCALL_PERM_OBJDIR_LINK_TGT, "Destination object is missing permissions");
+    return link_dup(link_obj, dest_obj.obj);
+}
+
 int
 _syscall_handle_objdir(syscall_context_t *ctx)
 {
@@ -34,6 +114,19 @@ _syscall_handle_objdir(syscall_context_t *ctx)
                 return s_syscall_objdir_objtype(
                         ctx->objdir, ctx->target.obj, ctx->bytes_left, ctx->payload);
             return -EPERM;
+
+        case SYSCALL_OBJDIR_SWAP:
+            if(ctx->target.permissions & SYSCALL_PERM_OBJDIR_SWAP)
+                return s_syscall_objdir_swap(ctx->target.obj,
+                        &ctx->lockstack, ctx->objdir, ctx->bytes_left, ctx->payload);
+            return -EPERM;
+        
+        case SYSCALL_OBJDIR_LINK:
+            if(ctx->target.permissions & SYSCALL_PERM_OBJDIR_LINK)
+                return s_syscall_objdir_link(ctx->target.obj,
+                        &ctx->lockstack, ctx->objdir, ctx->bytes_left, ctx->payload);
+            return -EPERM;
+
         default:
             return -EBADCALL;
     }
-- 
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