Solaris 11中未捕获第二个信号

Question

我已经为SIGABRT注册了信号处理程序。但只捕捉到了第一个信号。第二个或随后的信号转到SIG_DFL，程序终止。

下面是来自truss的应用程序进程id的代码片段。

/1:     stat64("/zones/netiq/AM/log/nqmlog.lck", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/agent20160223061748.err", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/agent20160223052255.err", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/NqmAgt_4.log", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/NqmAgt_3.log", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/agent20160223052605.err", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/1.log", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/agent20160223061613.err", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/agent20160223052430.err", 0xFEFFE28C) = 0
/1:     stat64("/zones/netiq/AM/log/NqmAgt_1.log", 0xFEFFE28C) = 0
/1:     getdents64(5, 0xFC204000, 8192)                 = 0
/1:     close(5)                                        = 0
/1:     statvfs64("/zones/netiq/AM", 0xFEFFE224)        = 0
/7:     lwp_park(0xFBB82DB8, 0)                         Err#62 ETIME
/10:    lwp_park(0xFB885DB8, 0)                         Err#62 ETIME
/10:    time()                                          = 1456208362
/10:    time()                                          = 1456208362
/10:    time()                                          = 1456208362
/7:     time()                                          = 1456208362
/7:     time()                                          = 1456208362
/7:     time()                                          = 1456208362
/1:     write(3, " [ 2 0 1 6 - 0 2 - 2 3  ".., 125)     = 125
/1:     time()                                          = 1456208362
/1:     write(3, " [ 2 0 1 6 - 0 2 - 2 3  ".., 665)     = 665
/1:     time()                                          = 1456208362
/1:     time()                                          = 1456208362
/1:     time()                                          = 1456208362
/1:     time()                                          = 1456208362
/1:     time()                                          = 1456208362
/1:     time()                                          = 1456208362
/1:     write(3, " [ 2 0 1 6 - 0 2 - 2 3  ".., 114)     = 114
/1:     write(3, " [ 2 0 1 6 - 0 2 - 2 3  ".., 168)     = 168
/1:     write(3, " [ 2 0 1 6 - 0 2 - 2 3  ".., 146)     = 146
/1:     lstat64("/zones/netiq/AM/data/Config_1", 0xFEFFE1E0) = 0
/1:     rmdir("/zones/netiq/AM/data/Config_1")          Err#17 EEXIST
/1:     open("/zones/netiq/AM/data/Config_1", O_RDONLY|O_NDELAY|O_LARGEFILE|O_CLOEXEC|O_DIRECTORY) = 5
/1:     fcntl(5, F_SETFD, 0x00000001)                   = 0
/1:     fstat64(5, 0xFEFFE1A0)                          = 0
/1:     pathconf("/zones/netiq/AM/data/Config_1", _PC_NAME_MAX) = 255
/1:     lwp_kill(1, SIGABRT)                            = 0
/1:         Received signal #6, SIGABRT [caught]
/1:           siginfo: SIGABRT pid=27656 uid=100 code=-1
/1:     lwp_sigmask(SIG_SETMASK, 0x00029000, 0x00000000, 0x00000000, 0x00000000) = 0xFFBFFEFF [0xFFFFFFFF]
/1:     chdir("/zones/netiq/AM/bin")                    = 0
/1:     setcontext(0xFEFFD8D0)
/1:     sigaction(SIGABRT, 0xFEFFE080, 0xFEFFE100)      = 0
/1:     lwp_sigmask(SIG_SETMASK, 0x00029000, 0x00000000, 0x00000000, 0x00000000) = 0xFFBFFEFF [0xFFFFFFFF]
/1:     lwp_kill(1, SIGABRT)                            = 0
/1:         Received signal #6, SIGABRT [default]
/1:           siginfo: SIGABRT pid=27656 uid=100 code=-1

请告诉我该怎么做。

用于信号处理的代码

        static void
    SetSignals(void)
    {
    struct sigaction sa;
     sa.sa_handler = signalHandler;       /* Point to our signal handler func. */
    sigemptyset(&sa.sa_mask);            /* Clear mask */

   /* Block delivery of these signals during receipt of any one of them */
   sigaddset(&sa.sa_mask, SIGINT);
   sigaddset(&sa.sa_mask, SIGTERM);
   sigaddset(&sa.sa_mask, SIGSEGV);
   sigaddset(&sa.sa_mask, SIGBUS);
   sigaddset(&sa.sa_mask, SIGILL);
   sigaddset(&sa.sa_mask, SIGTRAP);
   sigaddset(&sa.sa_mask, SIGABRT);
   sigaddset(&sa.sa_mask, SIGFPE);
   sa.sa_flags = 0;                     /* No special flags */
   sigaction(SIGINT, &sa, NULL);
   sigaction(SIGTERM, &sa, NULL);
   sigaction(SIGSEGV, &sa, NULL);
   sigaction(SIGBUS, &sa, NULL);
   sigaction(SIGILL, &sa, NULL);
   sigaction(SIGTRAP, &sa, NULL);
   sigaction(SIGABRT, &sa, NULL);
   sigaction(SIGFPE, &sa, NULL);

   /* Do nothing for SIGALRM. In release builds, it seems to kill us. */
   sa.sa_handler = doNothingHandler;
   sigemptyset(&sa.sa_mask); /* Clear mask */

   sigaction(SIGALRM, &sa, NULL);

   sa.sa_handler = SIG_IGN;
   sigemptyset(&sa.sa_mask);
   sigaddset(&sa.sa_mask,SIGHUP);
   sigaction(SIGHUP, &sa, NULL);
    }

信号处理程序：

static void
signalHandler(int signum)
{
  char PathName[1024];
   UA_LOG_COMPONENT(MAIN, "main::signalHandler" );
   UA_LOG_BLOCK( DEBUG3 );


  if (g_Settings.m_strBinaryPath.length()) {
    strncpy(PathName, g_Settings.m_strBinaryPath, sizeof(PathName));
    PathName[sizeof(PathName) - 1] = 0;
  }
  else
    snprintf(PathName, sizeof(PathName), "%s/bin", g_Settings.m_strHomeDir.data());

  if (chdir(PathName) == -1)
    perror("UnixAgent: Could not change directory to UnixAgent home bin directory.");

   if (signum == SIGINT) {
       printf("UnixAgent: Got SIGINT\n");
       bRunning = false;
   }
   if (signum == SIGSEGV) {
       printf("UnixAgent: Got SIGSEGV\n");
       bSigINT = true;
       bRunning = false;
       ShmUpdateSegv(signum);
   }
   else if (signum == SIGTERM) {
       printf("UnixAgent: Got SIGTERM\n");
       bRunning = false;
   }
   else if (signum == SIGHUP) {
       printf("UnixAgent: Got SIGHUP\n");
   }
}

Answer 1

如果您的Solaris使用与内华达州相同的abort (这里是abort.c source)，它将调用用户安装的SIGABRT处理程序(如果设置了的话)，然后进入无限循环，将SIGABRT的处理设置为SIG_DFL，然后引发信号。

如果您想要执行任何清理工作，只需调用您的处理程序就可以了。如果你不想让abort的其余部分运行，你可以用它做一个longjmp。