sys/syscall_objdir.c


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#include "arch/x86_64/hal/obj.h"
#include "hal/process.h"
#include "jove.h"
#include "lib/printf.h"
#include "syscall.h"

int
s_syscall_objdir_objtype(
        jove_owned_obj_t *objdir,
        jove_owned_obj_t *target_dir,
        size_t payload_size,
        void *payload_data)
{
    size_t bytes_needed = 2;
    CHECK_TOOSMALL(bytes_needed, payload_size, "Message is too small for payload.");

    uint16_t local_idx = *((uint16_t*)payload_data);
    if(local_idx > JOVE_OBJDIR_ENTRIES) {
        kprintf("%s: Object index is out of bounds (>= 512)\n", __func__);
        return EOOB;
    }

    jove_obj_t local_obj = objdir_peeklocal(target_dir, local_idx);
    return obj_peektype(local_obj);
}

int
_syscall_handle_objdir(syscall_context_t *ctx)
{
    switch(ctx->header->callid) {
        case SYSCALL_OBJDIR_OBJTYPE:
            if(ctx->target.permissions & SYSCALL_PERM_OBJDIR_OBJTYPE)
                return s_syscall_objdir_objtype(
                        ctx->objdir, ctx->target.obj, ctx->bytes_left, ctx->payload);
            return -EPERM;
        default:
            return -EBADCALL;
    }
}