Revert "Signal handling."

runtime/bin/process_linux.cc

Index: runtime/bin/process_linux.cc
diff --git a/runtime/bin/process_linux.cc b/runtime/bin/process_linux.cc
index 7479064013cf16f2e203bc36149b248d2ae52561..95d11cdce7dc2b8ee6a2aaf0ce1bcf12900d69de 100644
--- a/runtime/bin/process_linux.cc
+++ b/runtime/bin/process_linux.cc
@@ -18,7 +18,6 @@
 
 #include "bin/fdutils.h"
 #include "bin/log.h"
-#include "bin/signal_blocker.h"
 #include "bin/thread.h"
 
 
@@ -631,115 +630,6 @@ intptr_t Process::CurrentProcessId() {
   return static_cast<intptr_t>(getpid());
 }
 
-
-static Mutex* signal_mutex = new Mutex();
-static SignalInfo* signal_handlers = NULL;
-static const int kSignalsCount = 5;
-static const int kSignals[kSignalsCount] = {
-  SIGINT,
-  SIGWINCH,
-  SIGTERM,
-  SIGUSR1,
-  SIGUSR2
-};
-
-
-SignalInfo::~SignalInfo() {
-  VOID_TEMP_FAILURE_RETRY(close(fd_));
-}
-
-
-static void SignalHandler(int signal) {
-  MutexLocker lock(signal_mutex);
-  const SignalInfo* handler = signal_handlers;
-  while (handler != NULL) {
-    if (handler->signal() == signal) {
-      int value = 0;
-      VOID_TEMP_FAILURE_RETRY(write(handler->fd(), &value, 1));
-    }
-    handler = handler->next();
-  }
-}
-
-
-intptr_t Process::SetSignalHandler(intptr_t signal) {
-  bool found = false;
-  for (int i = 0; i < kSignalsCount; i++) {
-    if (kSignals[i] == signal) {
-      found = true;
-      break;
-    }
-  }
-  if (!found) return -1;
-  int fds[2];
-  if (TEMP_FAILURE_RETRY_BLOCK_SIGNALS(pipe(fds)) != 0) {
-    return -1;
-  }
-  if (!FDUtils::SetNonBlocking(fds[0])) {
-    VOID_TEMP_FAILURE_RETRY_BLOCK_SIGNALS(close(fds[0]));
-    VOID_TEMP_FAILURE_RETRY_BLOCK_SIGNALS(close(fds[1]));
-    return -1;
-  }
-  ThreadSignalBlocker blocker(kSignalsCount, kSignals);
-  MutexLocker lock(signal_mutex);
-  SignalInfo* handler = signal_handlers;
-  bool listen = true;
-  while (handler != NULL) {
-    if (handler->signal() == signal) {
-      listen = false;
-      break;
-    }
-    handler = handler->next();
-  }
-  if (listen) {
-    struct sigaction act;
-    bzero(&act, sizeof(act));
-    act.sa_handler = SignalHandler;
-    int status = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(
-        sigaction(signal, &act, NULL));
-    if (status < 0) {
-      VOID_TEMP_FAILURE_RETRY_BLOCK_SIGNALS(close(fds[0]));
-      VOID_TEMP_FAILURE_RETRY_BLOCK_SIGNALS(close(fds[1]));
-      return -1;
-    }
-  }
-  if (signal_handlers == NULL) {
-    signal_handlers = new SignalInfo(fds[1], signal);
-  } else {
-    new SignalInfo(fds[1], signal, signal_handlers);
-  }
-  return fds[0];
-}
-
-
-void Process::ClearSignalHandler(intptr_t signal) {
-  ThreadSignalBlocker blocker(kSignalsCount, kSignals);
-  MutexLocker lock(signal_mutex);
-  SignalInfo* handler = signal_handlers;
-  bool unlisten = true;
-  while (handler != NULL) {
-    bool remove = false;
-    if (handler->signal() == signal) {
-      if (handler->port() == Dart_GetMainPortId()) {
-        if (signal_handlers == handler) signal_handlers = handler->next();
-        handler->Unlink();
-        remove = true;
-      } else {
-        unlisten = false;
-      }
-    }
-    SignalInfo* next = handler->next();
-    if (remove) delete handler;
-    handler = next;
-  }
-  if (unlisten) {
-    struct sigaction act;
-    bzero(&act, sizeof(act));
-    act.sa_handler = SIG_DFL;
-    VOID_TEMP_FAILURE_RETRY_BLOCK_SIGNALS(sigaction(signal, &act, NULL));
-  }
-}
-
 }  // namespace bin
 }  // namespace dart