feat: 初始代码

AM初始代码，迁移自gitlabwh

Log:
Task: https://pms.uniontech.com/task-view-108539.html
Influence:
Change-Id: I6096f97e5d68d13796ff5dc51d9858c0f40264a0

src/modules/util/platform.cpp

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2020-2021. Uniontech Software Ltd. All rights reserved.
+ *
+ * Author:     Iceyer <me@iceyer.net>
+ *
+ * Maintainer: Iceyer <me@iceyer.net>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "platform.h"
+#include "logger.h"
+#include "debug/debug.h"
+
+#include <sched.h>
+#include <cstdlib>
+#include <sys/mman.h>
+#include <unistd.h>
+
+namespace linglong {
+
+const int kStackSize = (1024 * 1024);
+
+namespace util {
+
+int PlatformClone(int (*callback)(void *), int flags, void *arg, ...)
+{
+    char *stack;
+    char *stackTop;
+
+    stack = reinterpret_cast<char *>(
+        mmap(nullptr, kStackSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0));
+    if (stack == MAP_FAILED) {
+        return EXIT_FAILURE;
+    }
+
+    stackTop = stack + kStackSize;
+
+    return clone(callback, stackTop, flags, arg);
+}
+
+int Exec(const util::str_vec &args, tl::optional<std::vector<std::string>> env_list)
+{
+    auto targetArgc = args.size();
+    const char *targetArgv[targetArgc + 1];
+    for (decltype(targetArgc) i = 0; i < targetArgc; i++) {
+        targetArgv[i] = args[i].c_str();
+    }
+    targetArgv[targetArgc] = nullptr;
+
+    auto targetEnvc = env_list.has_value() ? env_list->size() : 0;
+    const char **targetEnvv = targetEnvc ? new const char *[targetEnvc + 1] : nullptr;
+    if (targetEnvv) {
+        for (decltype(targetEnvc) i = 0; i < targetEnvc; i++) {
+            targetEnvv[i] = env_list.value().at(i).c_str();
+        }
+        targetEnvv[targetEnvc] = nullptr;
+    }
+
+    logDbg() << "execve" << targetArgv[0] << " in pid:" << getpid();
+
+    int ret = execvpe(targetArgv[0], const_cast<char **>(targetArgv), const_cast<char **>(targetEnvv));
+
+    delete[] targetEnvv;
+
+    return ret;
+}
+
+} // namespace util
+} // namespace linglong