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       1                 :            : /*
       2                 :            :  * Copyright (c) 2008, 2009, 2011, 2012, 2013 Nicira, Inc.
       3                 :            :  *
       4                 :            :  * Licensed under the Apache License, Version 2.0 (the "License");
       5                 :            :  * you may not use this file except in compliance with the License.
       6                 :            :  * You may obtain a copy of the License at:
       7                 :            :  *
       8                 :            :  *     http://www.apache.org/licenses/LICENSE-2.0
       9                 :            :  *
      10                 :            :  * Unless required by applicable law or agreed to in writing, software
      11                 :            :  * distributed under the License is distributed on an "AS IS" BASIS,
      12                 :            :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      13                 :            :  * See the License for the specific language governing permissions and
      14                 :            :  * limitations under the License.
      15                 :            :  */
      16                 :            : 
      17                 :            : #include <config.h>
      18                 :            : #include "signals.h"
      19                 :            : #include <errno.h>
      20                 :            : #include <limits.h>
      21                 :            : #include <signal.h>
      22                 :            : #include <stdlib.h>
      23                 :            : #include <unistd.h>
      24                 :            : #include "poll-loop.h"
      25                 :            : #include "socket-util.h"
      26                 :            : #include "openvswitch/type-props.h"
      27                 :            : #include "util.h"
      28                 :            : #include "openvswitch/vlog.h"
      29                 :            : 
      30                 :      53956 : VLOG_DEFINE_THIS_MODULE(signals);
      31                 :            : 
      32                 :            : #if defined(_NSIG)
      33                 :            : #define N_SIGNALS _NSIG
      34                 :            : #elif defined(NSIG)
      35                 :            : #define N_SIGNALS NSIG
      36                 :            : #else
      37                 :            : /* We could try harder to get the maximum signal number, but in practice we
      38                 :            :  * only care about SIGHUP, which is normally signal 1 anyway. */
      39                 :            : #define N_SIGNALS 32
      40                 :            : #endif
      41                 :            : 
      42                 :            : /* Returns the name of signal 'signum' as a string.  The return value is either
      43                 :            :  * a statically allocated constant string or the 'bufsize'-byte buffer
      44                 :            :  * 'namebuf'.  'bufsize' should be at least SIGNAL_NAME_BUFSIZE.
      45                 :            :  *
      46                 :            :  * The string is probably a (possibly multi-word) description of the signal
      47                 :            :  * (e.g. "Hangup") instead of just the stringified version of the macro
      48                 :            :  * (e.g. "SIGHUP"). */
      49                 :            : const char *
      50                 :          8 : signal_name(int signum, char *namebuf, size_t bufsize)
      51                 :            : {
      52                 :            : #if HAVE_DECL_SYS_SIGLIST
      53 [ +  - ][ +  - ]:          8 :     if (signum >= 0 && signum < N_SIGNALS) {
      54                 :          8 :         const char *name = sys_siglist[signum];
      55         [ +  - ]:          8 :         if (name) {
      56                 :          8 :             return name;
      57                 :            :         }
      58                 :            :     }
      59                 :            : #endif
      60                 :            : 
      61                 :          0 :     snprintf(namebuf, bufsize, "signal %d", signum);
      62                 :          0 :     return namebuf;
      63                 :            : }
      64                 :            : 
      65                 :            : void
      66                 :      95801 : xsigaction(int signum, const struct sigaction *new, struct sigaction *old)
      67                 :            : {
      68         [ -  + ]:      95801 :     if (sigaction(signum, new, old)) {
      69                 :            :         char namebuf[SIGNAL_NAME_BUFSIZE];
      70                 :            : 
      71                 :          0 :         VLOG_FATAL("sigaction(%s) failed (%s)",
      72                 :            :                    signal_name(signum, namebuf, sizeof namebuf),
      73                 :            :                    ovs_strerror(errno));
      74                 :            :     }
      75                 :      95801 : }