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47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
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// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/fuchsia/file_utils.h"
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#include <lib/fdio/limits.h>
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#include <lib/fdio/util.h>
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#include <zircon/processargs.h>
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#include <utility>
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#include "base/files/file.h"
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#include "base/fuchsia/fuchsia_logging.h"
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namespace base {
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namespace fuchsia {
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zx::handle GetHandleFromFile(File file) {
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// Unwrap the FD into |handles|. Negative result indicates failure.
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zx_handle_t handles[FDIO_MAX_HANDLES] = {};
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uint32_t types[FDIO_MAX_HANDLES] = {};
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zx_status_t num_handles =
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fdio_transfer_fd(file.TakePlatformFile(), 0, handles, types);
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if (num_handles <= 0) {
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DCHECK_LT(num_handles, 0);
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ZX_DLOG(ERROR, num_handles) << "fdio_transfer_fd";
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return zx::handle();
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}
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// Wrap the returned handles, so they will be closed on error.
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zx::handle owned_handles[FDIO_MAX_HANDLES];
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for (int i = 0; i < FDIO_MAX_HANDLES; ++i)
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owned_handles[i] = zx::handle(handles[i]);
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// We expect a single handle, of type PA_FDIO_REMOTE.
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if (num_handles != 1 || types[0] != PA_FDIO_REMOTE) {
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DLOG(ERROR) << "Specified file has " << num_handles
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<< " handles, and type: " << types[0];
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return zx::handle();
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}
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return std::move(owned_handles[0]);
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}
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} // namespace fuchsia
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} // namespace base
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