// Copyright (C) 2018 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef IORAP_SRC_INODE2FILENAME_SYSTEM_CALL_H_
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#define IORAP_SRC_INODE2FILENAME_SYSTEM_CALL_H_
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#include <fruit/fruit.h>
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#include <dirent.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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// Abstract out the system calls behind a virtual interface:
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// This enables us to use dependency injection to provide mock implementations
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// during tests.
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struct SystemCall {
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// stat(2)
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virtual int stat(const char *pathname, struct stat *statbuf) = 0;
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// opendir(3)
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virtual DIR *opendir(const char *name) = 0;
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// readdir(3)
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virtual struct dirent *readdir(DIR *dirp) = 0;
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// closedir(3)
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virtual int closedir(DIR *dirp) = 0;
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virtual ~SystemCall() {}
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};
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// "Live" implementation that calls down to libc.
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struct SystemCallImpl : public SystemCall {
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// Marks this constructor as the one to use for injection.
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INJECT(SystemCallImpl()) = default;
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// stat(2)
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virtual int stat(const char *pathname, struct stat *statbuf) override {
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return ::stat(pathname, statbuf);
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}
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// opendir(3)
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virtual DIR *opendir(const char *name) override {
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return ::opendir(name);
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}
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// readdir(3)
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virtual struct dirent *readdir(DIR *dirp) override {
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return ::readdir(dirp);
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}
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// closedir(3)
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virtual int closedir(DIR *dirp) override {
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return ::closedir(dirp);
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}
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virtual ~SystemCallImpl() {}
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};
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#endif // IORAP_SRC_INODE2FILENAME_SYSTEM_CALL_H_
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