的boost ::绑定的sigaction函数引用一个实例 [英] Boost::bind a sigaction function reference to a instance

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问题描述

我想用Linux内核信号异步从模块进行通信的事件的发生，一个用户空间应用程序。在C I有这方面的工作以下列方式：

I would like to use a Linux kernel signal to asynchronously communicate the occurrence of an event from a module to a user-space application. I have this working in C in the following way:

void rcv_signal(int n, siginfo_t *info, void *unused)
{
   // Do something interesting with the signal
}

// Register for updates from the kernel
int main(int argc, char *argv[])
{
    struct sigaction sig;
    sig.sa_sigaction = rcv_signal; // Function pointer
    sig.sa_flags = SA_SIGINFO;
    sigaction(SOME_CUSTOM_SIGNAL, &sig, NULL);

    // Code to wait() then return
}

现在，我想移动到C ++实现。更具体地讲，我想使用boost ::功能/升压::绑定到sa_sigaction结合的方法 InputCapture ::收到。不过，我努力获得正确的函数签名。

Now, I would like to move to C++ implementation. More specifically, I would like to use boost::function / boost::bind to bind the sa_sigaction to a method InputCapture::receive. However, I am struggling to get the correct function signature.

下面是InputCapture类的定义：

Here is the definition of the InputCapture Class: 

class InputCapture
{
    public: InputCapture(uint8_t intimer) : timer(_timer) {}
    public: ~InputCapture() {}
    private: void receive(int n, siginfo_t *info, void *unused) {}
    private: uint8_t timer;
};

这里是修改sa_sigaction：

And here is the modified sa_sigaction:

// Register for updates from the kernel
struct sigaction sig;
sig.sa_sigaction = boost::function<void (int n, siginfo_t *info, void *unused)> (
    boost::bind(&InputCapture::receive, this, _1));
sig.sa_flags = SA_SIGINFO;
sigaction(SOME_CUSTOM_SIGNAL, &sig, NULL);

不过，我得到以下编译错误：

However, I get the following compilation error:

在文件从/home/asymingt/export/rootfs/usr/include/boost/bind.hpp:22:0包括，
                   从/home/asymingt/Workspace/Source/roseline/timesync/src/stamp/LogicalStamp.hpp:12，
                   从/home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.hpp:4，
                   从/home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:1：
  /home/asymingt/export/rootfs/usr/include/boost/bind/bind.hpp：在结构的boost :: _双:: result_traits'实例：
  /home/asymingt/export/rootfs/usr/include/boost/bind/bind_template.hpp:15:48：从类boost :: _双:: bind_t）（INT，SIGINFO，无效*）要求，提振:: _双::列表2，升压:: ARG＆LT; 1>>>
  /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:41:57：从这里需要
  /home/asymingt/export/rootfs/usr/include/boost/bind/bind.hpp:69:37：错误：无效（时间同步:: InputCapture :: ）（INT，SIGINFO 的，无效的*）'不是一个类，结构或联合类型
       的typedef typename的˚F:: result_type的类型;
                                       ^
  /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp：在构造函数中时间同步:: InputCapture :: InputCapture（uint8_t有）：
  /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:40:19：错误：无法转换'的boost ::函数到无效（）（INT，siginfo_t ，无效*）{又名无效（）（INT，SIGINFO 的，无效*）}'赋值
    sig.sa_sigaction =的boost ::功能（
                     ^
  从/home/asymingt/export/rootfs/usr/include/boost/function/detail/maybe_include.hpp:28:0包含在文件中，
                   从/home/asymingt/export/rootfs/usr/include/boost/function/detail/function_iterate.hpp:14，
                   从/home/asymingt/export/rootfs/usr/include/boost/$p$pprocessor/iteration/detail/iter/forward1.hpp:62，
                   从/home/asymingt/export/rootfs/usr/include/boost/function.hpp:64，
                   从/home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:3：
  /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp：在静态无效的实例boost::detail::function::void_function_obj_invoker3::invoke(boost::detail::function::function_buffer&, T0，T1，T2）与FunctionObj =提振:: _双:: bind_t）（INT，SIGINFO，无效*），提振:: _双::列表2，提振:: ARG＆LT; 1>>>; R =无效; T0 =​​ INT; T1 = SIGINFO *; T2 =无效*]'：
  /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:907:38：从'无效的boost :: function3 :: assign_to（函子）需要[用函子=提振:: _双向:: bind_t ）（INT，SIGINFO，无效*），提振:: _双::列表2，提振:: ARG＆LT; 1>>>; R =无效; T0 =​​ INT; T1 = SIGINFO *; T2 =无效*]
  /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:722:7：从'助推:: function3 :: function3（函子需要，类型名的boost :: enable_if_c ::值> ::值，int>的::类型）与函子=提振:: _双:: bind_t）（INT，SIGINFO，无效*），提振:: _双::列表2，提振:: ARG＆LT; 1>>>; R =无效; T0 =​​ INT; T1 = SIGINFO *; T2 =无效*;类型名的boost :: enable_if_c ::值> ::价值，诠释> ::类型= INT]'
  /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:1042:16：从'的boost ::功能::功能（需要的函数对象，类型名的boost :: enable_if_c ::值> ::值，int>的::类型）与函子=提振:: _双:: bind_t）（INT，SIGINFO，无效*），提振:: _双::列表2，提振:: ARG＆LT; 1>>>; R =无效; T0 =​​ INT; T1 = SIGINFO *; T2 =无效*;类型名的boost :: enable_if_c ::值> ::价值，诠释> ::类型= INT]'
  /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:41:58：从这里需要
  /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:153:57：错误：不对应的呼叫'（提高:: _双:: bind_t）（INT，SIGINFO，无效*） ，提振:: _双::列表2，提振:: ARG＆LT; 1>>>）（INT和放大器;，SIGINFO *放大器;，无效*放大器;）
             BOOST_FUNCTION_RETURN（（* F）（BOOST_FUNCTION_ARGS））;
                                                           ^
  /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:75:36：注：宏'BOOST_FUNCTION_RETURN的定义
   ＃定义BOOST_FUNCTION_RETURN（X）X

In file included from /home/asymingt/export/rootfs/usr/include/boost/bind.hpp:22:0, from /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/LogicalStamp.hpp:12, from /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.hpp:4, from /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:1: /home/asymingt/export/rootfs/usr/include/boost/bind/bind.hpp: In instantiation of ‘struct boost::_bi::result_traits’: /home/asymingt/export/rootfs/usr/include/boost/bind/bind_template.hpp:15:48: required from ‘class boost::_bi::bind_t)(int, siginfo, void*), boost::_bi::list2, boost::arg<1> > >’ /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:41:57: required from here /home/asymingt/export/rootfs/usr/include/boost/bind/bind.hpp:69:37: error: ‘void (timesync::InputCapture::)(int, siginfo, void*)’ is not a class, struct, or union type typedef typename F::result_type type; ^ /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp: In constructor ‘timesync::InputCapture::InputCapture(uint8_t)’: /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:40:19: error: cannot convert ‘boost::function’ to ‘void ()(int, siginfo_t, void*) {aka void ()(int, siginfo, void*)}’ in assignment sig.sa_sigaction = boost::function ( ^ In file included from /home/asymingt/export/rootfs/usr/include/boost/function/detail/maybe_include.hpp:28:0, from /home/asymingt/export/rootfs/usr/include/boost/function/detail/function_iterate.hpp:14, from /home/asymingt/export/rootfs/usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:62, from /home/asymingt/export/rootfs/usr/include/boost/function.hpp:64, from /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:3: /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp: In instantiation of ‘static void boost::detail::function::void_function_obj_invoker3::invoke(boost::detail::function::function_buffer&, T0, T1, T2) [with FunctionObj = boost::_bi::bind_t)(int, siginfo, void*), boost::_bi::list2, boost::arg<1> > >; R = void; T0 = int; T1 = siginfo*; T2 = void*]’: /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:907:38: required from ‘void boost::function3::assign_to(Functor) [with Functor = boost::_bi::bind_t)(int, siginfo, void*), boost::_bi::list2, boost::arg<1> > >; R = void; T0 = int; T1 = siginfo*; T2 = void*]’ /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:722:7: required from ‘boost::function3::function3(Functor, typename boost::enable_if_c::value>::value, int>::type) [with Functor = boost::_bi::bind_t)(int, siginfo, void*), boost::_bi::list2, boost::arg<1> > >; R = void; T0 = int; T1 = siginfo*; T2 = void*; typename boost::enable_if_c::value>::value, int>::type = int]’ /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:1042:16: required from ‘boost::function::function(Functor, typename boost::enable_if_c::value>::value, int>::type) [with Functor = boost::_bi::bind_t)(int, siginfo, void*), boost::_bi::list2, boost::arg<1> > >; R = void; T0 = int; T1 = siginfo*; T2 = void*; typename boost::enable_if_c::value>::value, int>::type = int]’ /home/asymingt/Workspace/Source/roseline/timesync/src/stamp/InputCapture.cpp:41:58: required from here /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:153:57: error: no match for call to ‘(boost::_bi::bind_t)(int, siginfo, void*), boost::_bi::list2, boost::arg<1> > >) (int&, siginfo*&, void*&)’ BOOST_FUNCTION_RETURN((*f)(BOOST_FUNCTION_ARGS)); ^ /home/asymingt/export/rootfs/usr/include/boost/function/function_template.hpp:75:36: note: in definition of macro ‘BOOST_FUNCTION_RETURN’ # define BOOST_FUNCTION_RETURN(X) X

就是我想实现可能，如果是这样，我在哪里出了错？

Is what I am trying to achieve possible, and if so, where have I gone wrong?

推荐答案

您不能做到这一点。

注意的sigaction :: sa_sigaction 是函数的指针。无论是的boost ::功能，也不的boost ::绑定的返回值可以转化为函数指针！

Note that sigaction::sa_sigaction is a pointer to function. Neither boost::function, nor the return value of boost::bind are convertible to a function pointer!

这篇关于的boost ::绑定的sigaction函数引用一个实例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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