c++ - 我可以在程序中定义的函数上使用 execvp() 吗？

Question

由于我的程序的组织方式，我想使用 execvp() 调用一个 C++ 函数。

这可能吗？

Answer 1

包括 execvp() 在内的所有 exec 变体只能调用文件系统中可见的完整程序。好消息是，如果你想在你已经加载的程序中调用一个函数，你只需要 fork()。它看起来像这样的伪代码:

int pid = fork();
if (pid == 0) {
    // Call your function here. This is a new process and any
    // changes you make will not be reflected back into the parent
    // variables. Be careful with files and shared resources like
    // database connections.
    _exit(0);
}
else if (pid == -1) {
    // An error happened and the fork() failed. This is a very rare
    // error, but you must handle it.
}
else {
    // Wait for the child to finish. You can use a signal handler
    // to catch it later if the child will take a long time.
    waitpid(pid, ...);
}