zircon/vdso/ktrace.fidl

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library zx;

@transport("Syscall")
protocol ktrace {
    // TODO(scottmg): This is another one where it's:
    //   (handle, data, offset, data_size)
    // rather than:
    //   (handle, data, data_size, offset).
    /// Rights: handle must have resource kind ZX_RSRC_KIND_ROOT.
    @arg_reorder("handle, data, offset, data_size, actual")
    ktrace_read(resource struct {
        handle handle:RESOURCE;
        offset uint32;
    }) -> (struct {
        status status;
        data vector_void;
        actual usize;
    });

    // TODO(scottmg): syscalls.banjo had the length of |ptr| being |action|?
    /// Rights: handle must have resource kind ZX_RSRC_KIND_ROOT.
    ktrace_control(resource struct {
        handle handle:RESOURCE;
        action uint32;
        options uint32;
        ptr voidptr;
    }) -> (struct {
        status status;
    });

    /// Rights: handle must have resource kind ZX_RSRC_KIND_ROOT.
    ktrace_write(resource struct {
        handle handle:RESOURCE;
        id uint32;
        arg0 uint32;
        arg1 uint32;
    }) -> (struct {
        status status;
    });
};