zircon/system/ulib/zxio/null.cpp

// Copyright 2018 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.

#include <lib/zxio/inception.h>
#include <lib/zxio/null.h>
#include <zircon/syscalls.h>

zx_status_t zxio_default_close(zxio_t* io) {
    return ZX_OK;
}

zx_status_t zxio_default_release(zxio_t* io, zx_handle_t* out_handle) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_clone(zxio_t* io, zx_handle_t* out_handle) {
    return ZX_ERR_NOT_SUPPORTED;
}

void zxio_default_wait_begin(zxio_t* io, zxio_signals_t zxio_signals,
                             zx_handle_t* out_handle,
                             zx_signals_t* out_zx_signals) {
    *out_handle = ZX_HANDLE_INVALID;
    *out_zx_signals = ZX_SIGNAL_NONE;
}

void zxio_default_wait_end(zxio_t* io, zx_signals_t zx_signals,
                           zxio_signals_t* out_zxio_signals) {
    *out_zxio_signals = ZXIO_SIGNAL_NONE;
}

zx_status_t zxio_default_sync(zxio_t* io) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_attr_get(zxio_t* io, zxio_node_attr_t* out_attr) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_attr_set(zxio_t* io, uint32_t flags,
                                  const zxio_node_attr_t* attr) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_read(zxio_t* io, void* buffer, size_t capacity,
                              size_t* out_actual) {
    return ZX_ERR_WRONG_TYPE;
}

zx_status_t zxio_default_read_at(zxio_t* io, size_t offset, void* buffer,
                                 size_t capacity, size_t* out_actual) {
    return ZX_ERR_WRONG_TYPE;
}

zx_status_t zxio_default_write(zxio_t* io, const void* buffer, size_t capacity,
                               size_t* out_actual) {
    return ZX_ERR_WRONG_TYPE;
}

zx_status_t zxio_default_write_at(zxio_t* io, size_t offset, const void* buffer,
                                  size_t capacity, size_t* out_actual) {
    return ZX_ERR_WRONG_TYPE;
}

zx_status_t zxio_default_seek(zxio_t* io, size_t offset, zxio_seek_origin_t start,
                              size_t* out_offset) {
    return ZX_ERR_WRONG_TYPE;
}

zx_status_t zxio_default_truncate(zxio_t* io, size_t length) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_flags_get(zxio_t* io, uint32_t* out_flags) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_flags_set(zxio_t* io, uint32_t flags) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_vmo_get(zxio_t* io, uint32_t flags, zx_handle_t* out_vmo,
                                 size_t* out_size) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_open(zxio_t* io, uint32_t flags, uint32_t mode,
                              const char* path, zxio_t** out_io) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_open_async(zxio_t* io, uint32_t flags, uint32_t mode,
                                    const char* path, zx_handle_t request) {
    zx_handle_close(request);
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_unlink(zxio_t* io, const char* path) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_token_get(zxio_t* io, zx_handle_t* out_token) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_rename(zxio_t* io, const char* src_path,
                                zx_handle_t dst_token, const char* dst_path) {
    zx_handle_close(dst_token);
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_link(zxio_t* io, const char* src_path,
                              zx_handle_t dst_token, const char* dst_path) {
    zx_handle_close(dst_token);
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_readdir(zxio_t* io, void* buffer, size_t capacity,
                                 size_t* out_actual) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_default_rewind(zxio_t* io) {
    return ZX_ERR_NOT_SUPPORTED;
}

zx_status_t zxio_null_read(zxio_t* io, void* buffer, size_t capacity,
                           size_t* out_actual) {
    *out_actual = 0u;
    return ZX_OK;
}

zx_status_t zxio_null_write(zxio_t* io, const void* buffer, size_t capacity,
                            size_t* out_actual) {
    *out_actual = capacity;
    return ZX_OK;
}

zx_status_t zxio_default_isatty(zxio_t* io, bool* tty) {
    *tty = false;
    return ZX_OK;
}

static constexpr zxio_ops_t zxio_null_ops = []() {
    zxio_ops_t ops = zxio_default_ops;
    ops.read = zxio_null_read;
    ops.write = zxio_null_write;
    return ops;
}();

zx_status_t zxio_null_init(zxio_t* io) {
    zxio_init(io, &zxio_null_ops);
    return ZX_OK;
}