8170639: [Linux] jsig is limited to a maximum of 64 signals

Reviewed-by: dholmes, iklam

src/hotspot/os/aix/os_aix.cpp

@@ -2996,8 +2996,6 @@ static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
 bool os::Aix::signal_handlers_are_installed = false;
 
 // For signal-chaining
-struct sigaction sigact[NSIG];
-sigset_t sigs;
 bool os::Aix::libjsig_is_loaded = false;
 typedef struct sigaction *(*get_signal_t)(int);
 get_signal_t os::Aix::get_signal_action = NULL;
@@ -3011,7 +3009,7 @@ struct sigaction* os::Aix::get_chained_signal_action(int sig) {
   }
   if (actp == NULL) {
     // Retrieve the preinstalled signal handler from jvm
-    actp = get_preinstalled_handler(sig);
+    actp = os::Posix::get_preinstalled_handler(sig);
   }
 
   return actp;
@@ -3074,19 +3072,6 @@ bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
   return chained;
 }
 
-struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
-  if (sigismember(&sigs, sig)) {
-    return &sigact[sig];
-  }
-  return NULL;
-}
-
-void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
-  assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
-  sigact[sig] = oldAct;
-  sigaddset(&sigs, sig);
-}
-
 // for diagnostic
 int sigflags[NSIG];
 
@@ -3118,7 +3103,7 @@ void os::Aix::set_signal_handler(int sig, bool set_installed) {
       return;
     } else if (UseSignalChaining) {
       // save the old handler in jvm
-      save_preinstalled_handler(sig, oldAct);
+      os::Posix::save_preinstalled_handler(sig, oldAct);
       // libjsig also interposes the sigaction() call below and saves the
       // old sigaction on it own.
     } else {
@@ -3174,7 +3159,6 @@ void os::Aix::install_signal_handlers() {
       (*begin_signal_setting)();
     }
 
-    ::sigemptyset(&sigs);
     set_signal_handler(SIGSEGV, true);
     set_signal_handler(SIGPIPE, true);
     set_signal_handler(SIGBUS, true);

src/hotspot/os/aix/os_aix.hpp

@@ -37,8 +37,6 @@ class Aix {
   static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
                                         // __sigaction(), signal() is loaded
   static struct sigaction *(*get_signal_action)(int);
-  static struct sigaction *get_preinstalled_handler(int);
-  static void save_preinstalled_handler(int, struct sigaction&);
 
   static void check_signal_handler(int sig);
 

src/hotspot/os/bsd/os_bsd.cpp

@@ -2658,11 +2658,6 @@ static void signalHandler(int sig, siginfo_t* info, void* uc) {
 bool os::Bsd::signal_handlers_are_installed = false;
 
 // For signal-chaining
-struct sigaction sigact[NSIG];
-uint32_t sigs = 0;
-#if (32 < NSIG-1)
-#error "Not all signals can be encoded in sigs. Adapt its type!"
-#endif
 bool os::Bsd::libjsig_is_loaded = false;
 typedef struct sigaction *(*get_signal_t)(int);
 get_signal_t os::Bsd::get_signal_action = NULL;
@@ -2676,7 +2671,7 @@ struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
   }
   if (actp == NULL) {
     // Retrieve the preinstalled signal handler from jvm
-    actp = get_preinstalled_handler(sig);
+    actp = os::Posix::get_preinstalled_handler(sig);
   }
 
   return actp;
@@ -2739,19 +2734,6 @@ bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
   return chained;
 }
 
-struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
-  if ((((uint32_t)1 << (sig-1)) & sigs) != 0) {
-    return &sigact[sig];
-  }
-  return NULL;
-}
-
-void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
-  assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
-  sigact[sig] = oldAct;
-  sigs |= (uint32_t)1 << (sig-1);
-}
-
 // for diagnostic
 int sigflags[NSIG];
 
@@ -2783,7 +2765,7 @@ void os::Bsd::set_signal_handler(int sig, bool set_installed) {
       return;
     } else if (UseSignalChaining) {
       // save the old handler in jvm
-      save_preinstalled_handler(sig, oldAct);
+      os::Posix::save_preinstalled_handler(sig, oldAct);
       // libjsig also interposes the sigaction() call below and saves the
       // old sigaction on it own.
     } else {

src/hotspot/os/bsd/os_bsd.hpp

@@ -37,8 +37,6 @@ class Bsd {
   static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
                                         // __sigaction(), signal() is loaded
   static struct sigaction *(*get_signal_action)(int);
-  static struct sigaction *get_preinstalled_handler(int);
-  static void save_preinstalled_handler(int, struct sigaction&);
 
   static void check_signal_handler(int sig);
 

src/hotspot/os/linux/os_linux.cpp

@@ -4463,11 +4463,6 @@ static void signalHandler(int sig, siginfo_t* info, void* uc) {
 bool os::Linux::signal_handlers_are_installed = false;
 
 // For signal-chaining
-struct sigaction sigact[NSIG];
-uint64_t sigs = 0;
-#if (64 < NSIG-1)
-#error "Not all signals can be encoded in sigs. Adapt its type!"
-#endif
 bool os::Linux::libjsig_is_loaded = false;
 typedef struct sigaction *(*get_signal_t)(int);
 get_signal_t os::Linux::get_signal_action = NULL;
@@ -4481,7 +4476,7 @@ struct sigaction* os::Linux::get_chained_signal_action(int sig) {
   }
   if (actp == NULL) {
     // Retrieve the preinstalled signal handler from jvm
-    actp = get_preinstalled_handler(sig);
+    actp = os::Posix::get_preinstalled_handler(sig);
   }
 
   return actp;
@@ -4545,19 +4540,6 @@ bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) {
   return chained;
 }
 
-struct sigaction* os::Linux::get_preinstalled_handler(int sig) {
-  if ((((uint64_t)1 << (sig-1)) & sigs) != 0) {
-    return &sigact[sig];
-  }
-  return NULL;
-}
-
-void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
-  assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
-  sigact[sig] = oldAct;
-  sigs |= (uint64_t)1 << (sig-1);
-}
-
 // for diagnostic
 int sigflags[NSIG];
 
@@ -4589,7 +4571,7 @@ void os::Linux::set_signal_handler(int sig, bool set_installed) {
       return;
     } else if (UseSignalChaining) {
       // save the old handler in jvm
-      save_preinstalled_handler(sig, oldAct);
+      os::Posix::save_preinstalled_handler(sig, oldAct);
       // libjsig also interposes the sigaction() call below and saves the
       // old sigaction on it own.
     } else {

src/hotspot/os/linux/os_linux.hpp

@@ -38,8 +38,6 @@ class Linux {
   static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
                                         // __sigaction(), signal() is loaded
   static struct sigaction *(*get_signal_action)(int);
-  static struct sigaction *get_preinstalled_handler(int);
-  static void save_preinstalled_handler(int, struct sigaction&);
 
   static void check_signal_handler(int sig);
 

src/hotspot/os/posix/os_posix.cpp

@@ -1673,6 +1673,24 @@ static void pthread_init_common(void) {
   }
 }
 
+#ifndef SOLARIS
+sigset_t sigs;
+struct sigaction sigact[NSIG];
+
+struct sigaction* os::Posix::get_preinstalled_handler(int sig) {
+  if (sigismember(&sigs, sig)) {
+    return &sigact[sig];
+  }
+  return NULL;
+}
+
+void os::Posix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
+  assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
+  sigact[sig] = oldAct;
+  sigaddset(&sigs, sig);
+}
+#endif
+
 // Not all POSIX types and API's are available on all notionally "posix"
 // platforms. If we have build-time support then we will check for actual
 // runtime support via dlopen/dlsym lookup. This allows for running on an
@@ -1783,6 +1801,7 @@ void os::Posix::init_2(void) {
                (_pthread_condattr_setclock != NULL ? "" : " not"));
   log_info(os)("Relative timed-wait using pthread_cond_timedwait is associated with %s",
                _use_clock_monotonic_condattr ? "CLOCK_MONOTONIC" : "the default clock");
+  sigemptyset(&sigs);
 #endif // !SOLARIS
 }
 
@@ -1797,6 +1816,7 @@ void os::Posix::init_2(void) {
   log_info(os)("Use of CLOCK_MONOTONIC is not supported");
   log_info(os)("Use of pthread_condattr_setclock is not supported");
   log_info(os)("Relative timed-wait using pthread_cond_timedwait is associated with the default clock");
+  sigemptyset(&sigs);
 #endif // !SOLARIS
 }
 

src/hotspot/os/posix/os_posix.hpp

@@ -117,6 +117,9 @@ public:
   // effective gid, or if given uid is root.
   static bool matches_effective_uid_and_gid_or_root(uid_t uid, gid_t gid);
 
+  static struct sigaction *get_preinstalled_handler(int);
+  static void save_preinstalled_handler(int, struct sigaction&);
+
   static void print_umask(outputStream* st, mode_t umsk);
 
   static void print_user_info(outputStream* st);