zircon/vdso/exception.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")
closed protocol Exception {
    /// ## Summary
    ///
    /// Create a handle for the exception's thread.
    ///
    /// ## Declaration
    ///
    /// ```c
    /// #include <zircon/syscalls.h>
    ///
    /// zx_status_t zx_exception_get_thread(zx_handle_t handle, zx_handle_t* out);
    /// ```
    ///
    /// ## Description
    ///
    /// *handle* is the exception handle.
    ///
    /// *out* will be filled with a new handle to the exception thread. This handle
    /// will have the same rights as the task given to
    /// [`zx_task_create_exception_channel()`].
    ///
    /// ## Rights
    ///
    /// *handle* must be of type **ZX_OBJ_TYPE_EXCEPTION**.
    ///
    /// ## Return value
    ///
    /// `zx_exception_get_thread()` returns **ZX_OK** on success.
    /// In the event of failure, a negative error value is returned.
    ///
    /// ## Errors
    ///
    /// **ZX_ERR_BAD_HANDLE** *handle* is not a valid handle.
    ///
    /// **ZX_ERR_NO_MEMORY**  Failed to allocate memory for a new handle.
    ///
    /// **ZX_ERR_WRONG_TYPE**  *handle* is not an exception.
    ///
    /// ## See also
    ///
    ///  - [exceptions]
    ///  - [`zx_exception_get_process()`]
    ///
    /// [exceptions]: /docs/concepts/kernel/exceptions.md
    /// [`zx_exception_get_process()`]: exception_get_process.md
    /// [`zx_task_create_exception_channel()`]: task_create_exception_channel.md
    strict GetThread(resource struct {
        handle Handle:EXCEPTION;
    }) -> (resource struct {
        out Handle:THREAD;
    }) error Status;

    /// ## Summary
    ///
    /// Create a handle for the exception's process.
    ///
    /// ## Declaration
    ///
    /// ```c
    /// #include <zircon/syscalls.h>
    ///
    /// zx_status_t zx_exception_get_process(zx_handle_t handle, zx_handle_t* out);
    /// ```
    ///
    /// ## Description
    ///
    /// The exception process is only available for job and process exception channels,
    /// thread exceptions cannot access their parent process handles.
    ///
    /// *handle* is the exception handle.
    ///
    /// *out* will be filled with a new handle to the exception process. This handle
    /// will have the same rights as the task given to
    /// [`zx_task_create_exception_channel()`].
    ///
    /// ## Rights
    ///
    /// *handle* must be of type **ZX_OBJ_TYPE_EXCEPTION**.
    ///
    /// ## Return value
    ///
    /// `zx_exception_get_process()` returns **ZX_OK** on success.
    /// In the event of failure, a negative error value is returned.
    ///
    /// ## Errors
    ///
    /// **ZX_ERR_ACCESS_DENIED** *handle* was received via a thread exception channel.
    ///
    /// **ZX_ERR_BAD_HANDLE** *handle* is not a valid handle.
    ///
    /// **ZX_ERR_NO_MEMORY**  Failed to allocate memory for a new handle.
    ///
    /// **ZX_ERR_WRONG_TYPE**  *handle* is not an exception.
    ///
    /// ## See also
    ///
    ///  - [exceptions]
    ///  - [`zx_exception_get_thread()`]
    ///
    /// [exceptions]: /docs/concepts/kernel/exceptions.md
    /// [`zx_exception_get_thread()`]: exception_get_thread.md
    /// [`zx_task_create_exception_channel()`]: task_create_exception_channel.md
    strict GetProcess(resource struct {
        handle Handle:EXCEPTION;
    }) -> (resource struct {
        out Handle:PROCESS;
    }) error Status;
};