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#pragma once
/// @file
#include "error.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <signal.h>
#include <atomic>
#include <functional>
namespace nix {
/* User interruption. */
class Interrupted;
extern std::atomic<bool> _isInterrupted;
extern thread_local std::function<bool()> interruptCheck;
Interrupted makeInterrupted();
void _interrupted();
void inline checkInterrupt()
{
if (_isInterrupted || (interruptCheck && interruptCheck()))
_interrupted();
}
MakeError(Interrupted, BaseError);
void restoreSignals();
/**
* Start a thread that handles various signals. Also block those signals
* on the current thread (and thus any threads created by it).
* Saves the signal mask before changing the mask to block those signals.
* See saveSignalMask().
*/
void startSignalHandlerThread();
/**
* Saves the signal mask, which is the signal mask that nix will restore
* before creating child processes.
* See setChildSignalMask() to set an arbitrary signal mask instead of the
* current mask.
*/
void saveSignalMask();
/**
* Sets the signal mask. Like saveSignalMask() but for a signal set that doesn't
* necessarily match the current thread's mask.
* See saveSignalMask() to set the saved mask to the current mask.
*/
void setChildSignalMask(sigset_t *sigs);
struct InterruptCallback
{
virtual ~InterruptCallback() { };
};
/**
* Register a function that gets called on SIGINT (in a non-signal
* context).
*/
std::unique_ptr<InterruptCallback> createInterruptCallback(
std::function<void()> callback);
void triggerInterrupt();
/**
* A RAII class that causes the current thread to receive SIGUSR1 when
* the signal handler thread receives SIGINT. That is, this allows
* SIGINT to be multiplexed to multiple threads.
*/
struct ReceiveInterrupts
{
pthread_t target;
std::unique_ptr<InterruptCallback> callback;
ReceiveInterrupts()
: target(pthread_self())
, callback(createInterruptCallback([&]() { pthread_kill(target, SIGUSR1); }))
{ }
};
};
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