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[onert] Add MockSycallManager for customized system call mocking (#16333)
It adds new MockSyscallsManager class to provide configurable hook system for mocking system calls in tests. ONE-DCO-1.0-Signed-off-by: Jonghwa Lee <[email protected]>
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‎runtime/onert/backend/trix/ops/test/mock_syscalls.h‎

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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <functional>
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#include <memory>
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#include <cstdarg>
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int open(const char *, int, ...) { return 0; }
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void *mmap(void *, size_t, int, int, int, off_t) { return (void *)0x1; }
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int munmap(void *, size_t) { return 0; }
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int close(int) { return 0; }
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int ioctl(int, unsigned long, ...) { return 0; }
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size_t fread(void *, size_t, size_t, FILE *) { return 1; }
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int fseek(FILE *, long, int) { return 0; }
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namespace onert
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{
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namespace backend
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{
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namespace trix
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{
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namespace ops
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{
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namespace test
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{
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#endif
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class MockSyscallsManager
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{
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public:
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// Function type definitions for each syscall
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// Note: std::function doesn't work well with variadic functions, so we use specific signatures
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using OpenHook = std::function<int(const char *, int)>;
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using OpenCreatHook = std::function<int(const char *, int, mode_t)>;
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using MmapHook = std::function<void *(void *, size_t, int, int, int, off_t)>;
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using MunmapHook = std::function<int(void *, size_t)>;
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using CloseHook = std::function<int(int)>;
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using IoctlHook = std::function<int(int, unsigned long, void *)>;
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using FopenHook = std::function<FILE *(const char *, const char *)>;
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using FcloseHook = std::function<int(FILE *)>;
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using FreadHook = std::function<size_t(void *, size_t, size_t, FILE *)>;
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using FseekHook = std::function<int(FILE *, long, int)>;
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static MockSyscallsManager &getInstance()
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{
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static MockSyscallsManager instance;
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return instance;
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}
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// Hook registration functions
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void setOpenHook(OpenHook hook) { _openHook = hook; }
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void setOpenCreatHook(OpenCreatHook hook) { _openCreatHook = hook; }
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void setMmapHook(MmapHook hook) { _mmapHook = hook; }
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void setMunmapHook(MunmapHook hook) { _munmapHook = hook; }
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void setCloseHook(CloseHook hook) { _closeHook = hook; }
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void setIoctlHook(IoctlHook hook) { _ioctlHook = hook; }
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void setFopenHook(FopenHook hook) { _fopenHook = hook; }
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void setFcloseHook(FcloseHook hook) { _fcloseHook = hook; }
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void setFreadHook(FreadHook hook) { _freadHook = hook; }
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void setFseekHook(FseekHook hook) { _fseekHook = hook; }
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// Hook retrieval functions
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OpenHook getOpenHook() const { return _openHook; }
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OpenCreatHook getOpenCreatHook() const { return _openCreatHook; }
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MmapHook getMmapHook() const { return _mmapHook; }
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MunmapHook getMunmapHook() const { return _munmapHook; }
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CloseHook getCloseHook() const { return _closeHook; }
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IoctlHook getIoctlHook() const { return _ioctlHook; }
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FopenHook getFopenHook() const { return _fopenHook; }
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FcloseHook getFcloseHook() const { return _fcloseHook; }
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FreadHook getFreadHook() const { return _freadHook; }
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FseekHook getFseekHook() const { return _fseekHook; }
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// Hook clearing functions
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void clearOpenHook() { _openHook = nullptr; }
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void clearOpenCreatHook() { _openCreatHook = nullptr; }
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void clearMmapHook() { _mmapHook = nullptr; }
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void clearMunmapHook() { _munmapHook = nullptr; }
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void clearCloseHook() { _closeHook = nullptr; }
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void clearIoctlHook() { _ioctlHook = nullptr; }
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void clearFopenHook() { _fopenHook = nullptr; }
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void clearFcloseHook() { _fcloseHook = nullptr; }
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void clearFreadHook() { _freadHook = nullptr; }
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void clearFseekHook() { _fseekHook = nullptr; }
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// Reset all hooks
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void resetAll()
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{
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clearOpenHook();
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clearOpenCreatHook();
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clearMmapHook();
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clearMunmapHook();
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clearCloseHook();
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clearIoctlHook();
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clearFopenHook();
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clearFcloseHook();
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clearFreadHook();
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clearFseekHook();
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}
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private:
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MockSyscallsManager() = default;
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~MockSyscallsManager() = default;
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MockSyscallsManager(const MockSyscallsManager &) = delete;
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MockSyscallsManager &operator=(const MockSyscallsManager &) = delete;
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// Hook function pointers
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OpenHook _openHook;
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OpenCreatHook _openCreatHook;
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MmapHook _mmapHook;
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MunmapHook _munmapHook;
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CloseHook _closeHook;
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IoctlHook _ioctlHook;
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FopenHook _fopenHook;
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FcloseHook _fcloseHook;
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FreadHook _freadHook;
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FseekHook _fseekHook;
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};
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} // namespace test
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} // namespace ops
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} // namespace trix
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} // namespace backend
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} // namespace onert
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// Mock syscall implementations
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int open(const char *pathname, int flags, ...);
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void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset);
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int munmap(void *addr, size_t length);
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int close(int fd);
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int ioctl(int fd, unsigned long request, ...);
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FILE *fopen(const char *path, const char *mode);
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int fclose(FILE *stream);
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size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
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int fseek(FILE *stream, long offset, int whence);
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#endif // _MOCK_SYSCALLS_H_

‎runtime/onert/backend/trix/ops/test/mock_syscalls.test.cc‎

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/*
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* Copyright (c) 2025 Samsung Electronics Co., Ltd. All Rights Reserved
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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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*/
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#include "mock_syscalls.h"
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int open(const char *pathname, int flags, ...)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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// Handle variable arguments for open()
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if (flags & O_CREAT)
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{
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if (auto creatHook = manager.getOpenCreatHook())
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{
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va_list args;
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va_start(args, flags);
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mode_t mode = va_arg(args, mode_t);
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va_end(args);
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return creatHook(pathname, flags, mode);
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}
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}
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else
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{
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if (auto hook = manager.getOpenHook())
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{
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return hook(pathname, flags);
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}
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}
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return 0; // Default mock return value
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}
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void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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if (auto hook = manager.getMmapHook())
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{
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return hook(addr, length, prot, flags, fd, offset);
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}
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return (void *)0x1; // Default mock return value
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}
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int munmap(void *addr, size_t length)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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if (auto hook = manager.getMunmapHook())
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{
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return hook(addr, length);
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}
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return 0; // Default mock return value
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}
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int close(int fd)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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if (auto hook = manager.getCloseHook())
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{
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return hook(fd);
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}
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return 0; // Default mock return value
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}
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int ioctl(int fd, unsigned long request, ...)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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if (auto hook = manager.getIoctlHook())
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{
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va_list args;
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va_start(args, request);
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void *arg = va_arg(args, void *);
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va_end(args);
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return hook(fd, request, arg);
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}
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return 0; // Default mock return value
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}
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FILE *fopen(const char *path, const char *mode)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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if (auto hook = manager.getFopenHook())
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{
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return hook(path, mode);
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}
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return (FILE *)0x1; // Default mock return value
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}
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int fclose(FILE *stream)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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if (auto hook = manager.getFcloseHook())
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{
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return hook(stream);
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}
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return 0;
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}
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size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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if (auto hook = manager.getFreadHook())
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{
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return hook(ptr, size, nmemb, stream);
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}
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return 1; // Default mock return value
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}
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int fseek(FILE *stream, long offset, int whence)
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{
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auto &manager = onert::backend::trix::ops::test::MockSyscallsManager::getInstance();
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if (auto hook = manager.getFseekHook())
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{
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return hook(stream, offset, whence);
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}
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return 0; // Default mock return value
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}

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