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#include "signals.h"
#include "utils.h"
#include <yql/essentials/utils/backtrace/backtrace.h>
#include <util/stream/output.h>
#include <util/generic/yexception.h>
#include <util/datetime/base.h>
#include <util/network/socket.h>
#include <util/system/getpid.h>
#ifdef _linux_
# include <sys/prctl.h>
#endif
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <stdlib.h>
namespace NYql {
volatile sig_atomic_t NeedTerminate = 0;
volatile sig_atomic_t NeedQuit = 0;
volatile sig_atomic_t NeedReconfigure = 0;
volatile sig_atomic_t NeedReopenLog = 0;
volatile sig_atomic_t NeedReapZombies = 0;
volatile sig_atomic_t NeedInterrupt = 0;
volatile sig_atomic_t CatchInterrupt = 0;
TPipe SignalPipeW;
TPipe SignalPipeR;
namespace {
void SignalHandler(int signo)
{
switch (signo) {
case SIGTERM:
NeedTerminate = 1;
break;
case SIGQUIT:
NeedQuit = 1;
break;
#ifdef _unix_
case SIGHUP:
NeedReconfigure = 1;
break;
case SIGUSR1:
NeedReopenLog = 1;
break;
case SIGCHLD:
NeedReapZombies = 1;
break;
#endif
case SIGINT:
if (CatchInterrupt) {
NeedInterrupt = 1;
} else {
fprintf(stderr, "%s (pid=%d) captured SIGINT\n",
GetProcTitle(), getpid());
signal(signo, SIG_DFL);
raise(signo);
}
break;
default:
break;
}
}
void SignalHandlerWithSelfPipe(int signo)
{
SignalHandler(signo);
int savedErrno = errno;
if (write(SignalPipeW.GetHandle(), "x", 1) == -1 && errno != EAGAIN) {
static TStringBuf msg("cannot write to signal pipe");
#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif
write(STDERR_FILENO, msg.data(), msg.size());
abort();
}
errno = savedErrno;
}
#ifndef _unix_
const char* strsignal(int signo)
{
switch (signo) {
case SIGTERM: return "SIGTERM";
case SIGINT: return "SIGINT";
case SIGQUIT: return "SIGQUIT";
default:
return "UNKNOWN";
}
}
#endif
#ifdef _unix_
int SetSignalHandler(int signo, void (*handler)(int))
{
struct sigaction sa;
sa.sa_flags = SA_RESTART;
sa.sa_handler = handler;
sigemptyset(&sa.sa_mask);
return sigaction(signo, &sa, nullptr);
}
#else
int SetSignalHandler(int signo, void (*handler)(int))
{
return (signal(signo, handler) == SIG_ERR) ? -1 : 0;
}
#endif
struct TSignalHandlerDesc
{
int signo;
void (*handler)(int);
};
void SetSignalHandlers(const TSignalHandlerDesc* handlerDescs)
{
sigset_t interestedSignals;
SigEmptySet(&interestedSignals);
for (int i = 0; handlerDescs[i].signo != -1; i++) {
int signo = handlerDescs[i].signo;
SigAddSet(&interestedSignals, signo);
if (SetSignalHandler(signo, handlerDescs[i].handler) == -1) {
ythrow TSystemError() << "Cannot set handler for signal "
<< strsignal(signo);
}
}
if (SigProcMask(SIG_BLOCK, &interestedSignals, NULL) == -1) {
ythrow TSystemError() << "Cannot set sigprocmask";
}
NYql::NBacktrace::RegisterKikimrFatalActions();
}
} // namespace
void InitSignals()
{
TSignalHandlerDesc handlerDescs[] = {
{ SIGTERM, SignalHandler },
{ SIGINT, SignalHandler },
{ SIGQUIT, SignalHandler },
#ifdef _unix_
{ SIGPIPE, SIG_IGN },
{ SIGHUP, SignalHandler },
{ SIGUSR1, SignalHandler },
{ SIGCHLD, SignalHandler },
#endif
{ -1, nullptr }
};
SetSignalHandlers(handlerDescs);
}
void InitSignalsWithSelfPipe()
{
TSignalHandlerDesc handlerDescs[] = {
{ SIGTERM, SignalHandlerWithSelfPipe },
{ SIGINT, SignalHandlerWithSelfPipe },
{ SIGQUIT, SignalHandlerWithSelfPipe },
#ifdef _unix_
{ SIGPIPE, SIG_IGN },
{ SIGHUP, SignalHandlerWithSelfPipe },
{ SIGUSR1, SignalHandlerWithSelfPipe },
{ SIGCHLD, SignalHandlerWithSelfPipe },
#endif
{ -1, nullptr }
};
TPipe::Pipe(SignalPipeR, SignalPipeW);
SetNonBlock(SignalPipeR.GetHandle());
SetNonBlock(SignalPipeW.GetHandle());
SetSignalHandlers(handlerDescs);
}
void CatchInterruptSignal(bool doCatch) {
CatchInterrupt = doCatch;
}
void SigSuspend(const sigset_t* mask)
{
#ifdef _unix_
sigsuspend(mask);
#else
Y_UNUSED(mask);
Sleep(TDuration::Seconds(1));
#endif
}
void AllowAnySignals()
{
sigset_t blockMask;
SigEmptySet(&blockMask);
if (SigProcMask(SIG_SETMASK, &blockMask, NULL) == -1) {
ythrow TSystemError() << "Cannot set sigprocmask";
}
}
bool HasPendingQuitOrTerm() {
#ifdef _unix_
sigset_t signals;
SigEmptySet(&signals);
if (sigpending(&signals)) {
ythrow TSystemError() << "Error in sigpending";
}
return (SigIsMember(&signals, SIGQUIT) == 1) || (SigIsMember(&signals, SIGTERM) == 1);
#else
return false;
#endif
}
} // namespace NYql
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