C++ 使用信号情报
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Using SIGINT
提问by Jon
According to this http://www.cplusplus.com/reference/clibrary/csignal/signal.html
根据这个http://www.cplusplus.com/reference/clibrary/csignal/signal.html
SIGINTis generally used/cause by the user. How do i cause a SIGINTin c++? i seen an example using kill(pid, SIGINT);but i rather cause it another way. Also i am using windows.
SIGINT通常由用户使用/引起。我如何SIGINT在 C++ 中导致 a ？我看到了一个例子，kill(pid, SIGINT);但我宁愿以另一种方式导致它。我也在使用窗户。
回答by Joao da Silva
C89 and C99 define raise() in signal.h:
C89 和 C99 在 signal.h 中定义了 raise()：
#include <signal.h>
int raise(int sig);
This function sends a signal to the calling process, and is equivalent to
该函数向调用进程发送信号，相当于
kill(getpid(), sig);
If the platform supports threads, then the call is equivalent to
如果平台支持线程，那么调用就相当于
pthread_kill(pthread_self(), sig);
The return value is 0 on success, nonzero otherwise.
成功时返回值为 0，否则为非零。
回答by Jon
You cause a SIGINTby pressing Ctrl+C.
您可以SIGINT通过按引起 a Ctrl+C。
Example code:
示例代码：
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
void siginthandler(int param)
{
printf("User pressed Ctrl+C\n");
exit(1);
}
int main()
{
signal(SIGINT, siginthandler);
while(1);
return 0;
}
When run:
运行时：
$ ./a.out
^CUser pressed Ctrl+C
$
(Note that this is pure C code, should work in C++ though)
（请注意，这是纯 C 代码，不过应该可以在 C++ 中工作）
Edit: The only way I know of to send SIGINTapart from interactively pressing Ctrl+Cis using kill(pid, SIGINT)as you said...
编辑：我所知道的SIGINT除了交互式按压之外的唯一发送方式Ctrl+C是使用kill(pid, SIGINT)你所说的......
回答by Greg Hewgill
What other way are you thinking of? The kill()function is the only way the kernel offers to programmatically send a signal.
你还想什么办法？该kill()函数是内核提供的以编程方式发送信号的唯一方式。
Actually, you mentioned you were using Windows. I'm not even sure what kill()does on Windows, since Windows doesn't have the same signal architecture that Unix-derived systems do. Win32 does offer the TerminateProcess function, which may do what you want. There is also the GenerateConsoleCtrlEventfunction, which applies to console programs and simulates a Ctrl+C or Ctrl+Break.
实际上，您提到您使用的是Windows。我什至不确定kill()Windows 上有什么，因为 Windows 没有与 Unix 派生系统相同的信号架构。Win32 确实提供了 TerminateProcess 函数，它可以执行您想要的操作。还有GenerateConsoleCtrlEvent函数，它适用于控制台程序并模拟 Ctrl+C 或 Ctrl+Break。
回答by unwind
"Signals" in this regard are a Unix/POSIX concept. Windows has no direct equivalent.
在这方面的“信号”是一个 Unix/POSIX 概念。Windows 没有直接的等价物。
回答by Тарик Ялауи
void SendSIGINT( HANDLE hProcess )
{
DWORD pid = GetProcessId(hProcess);
FreeConsole();
if (AttachConsole(pid))
{
// Disable Ctrl-C handling for our program
SetConsoleCtrlHandler(NULL, true);
GenerateConsoleCtrlEvent(CTRL_C_EVENT, 0); // SIGINT
//Re-enable Ctrl-C handling or any subsequently started
//programs will inherit the disabled state.
SetConsoleCtrlHandler(NULL, false);
WaitForSingleObject(hProcess, 10000);
}
}
回答by jheriko
I assume this is a Win32 app...
我假设这是一个 Win32 应用程序...
For a "controlled" or "safe" exit, if the app uses a message loop you can use the PostQuitMessage API from inside of it, or PostMessage outside of it. Otherwise you will need to get the thread/process ID and use the TerminateThread or TerminateProcess API, depending on if you want to kill just a thread or the entire process and all threads it has spawned. It is explained nicely by Microsoft (as with all API calls) on MSDN:
对于“受控”或“安全”退出，如果应用程序使用消息循环，您可以从其内部使用 PostQuitMessage API，或在其外部使用 PostMessage。否则，您将需要获取线程/进程 ID 并使用 TerminateThread 或 TerminateProcess API，具体取决于您是想杀死一个线程还是整个进程及其产生的所有线程。Microsoft（与所有 API 调用一样）在 MSDN 上对此进行了很好的解释：
