从C中的另一个函数调用主函数 [英] Calling main function from another function in C

问题描述

我有一个主要功能，该功能在初始化期间运行一些功能，然后运行一个while循环，等待来自UART的命令.

I have a main function that runs a few functions during initialization and then runs a while loop that waits for commands from the UART.

当我看到一个特定的命令(比如说reset)时，我调用一个返回值的函数.我想做以下事情:

When I see a specific command (let's say reset), I call a function that returns a value. I want to do the following things:

1. 保存返回值
2. 使用返回的值再次启动主函数.在main中的函数初始化期间需要返回的值.

我是C语言的新手，无法找到一种在main中保存变量值的方法.

I am newbie in C and I am not able to figure out a way save variable value in main.

推荐答案

按照我的理解方式，您基本上具有以下设置:

The way I understand things, you essentially have the following setup:

int main(int argc, char *argv[]) {
    int value = something_from_last_reset;
    perform_initialization(value);
    while(1) {
        int next_command = wait_for_command();
        if(next_command == RESET_COMMAND) {
            value = get_value();
            // somehow restart main() with this new value
        }
    }
    return 0;
}

这是您可以采用的一种方法:

Here's one approach you could take:

// global
int value = some_initial_value;

void event_loop() {
    while(1) {
        int next_command = wait_for_command();
        if(next_command == RESET_COMMAND) {
            value = get_value();
            return; // break out of the function call
        }
    }
}

int main(int argc, char *argv[]) {
    while(1) {
        perform_initialization(value);
        event_loop();
    }
    return 0;
}

从本质上讲，这使您可以从事件循环中退出"并重新执行初始化.

This essentially lets you "escape" from the event loop and perform the initialization all over again.

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