{"id":4030,"date":"2022-08-23T16:27:20","date_gmt":"2022-08-23T08:27:20","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=4030"},"modified":"2022-08-23T16:23:10","modified_gmt":"2022-08-23T08:23:10","slug":"linux-signal-send-and-catch-handle","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/linux-signal-send-and-catch-handle.html","title":{"rendered":"Linux Signal\u4fe1\u53f7\u5904\u7406\uff1a\u4fe1\u53f7\u53d1\u9001\u4e0e\u6355\u83b7"},"content":{"rendered":"
\n
\n \t<\/i> Read Time:<\/span>2 Minute, 48 Second <\/div>\n\n <\/div>\n

\u5728\u6d89\u53ca\u5230Linux\u73af\u5883\u6216\u8005\u662f\u7c7bLinux\u7684\u73af\u5883\u505a\u5f00\u53d1\u65f6\uff0c\u4fe1\u53f7\u5904\u7406\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u4e3a\u4ec0\u4e48\u9700\u8981\u4fe1\u53f7\uff0c\u5176\u5b58\u5728\u7684\u610f\u4e49\u4f55\u5728\uff0c\u5982\u4f55\u53d1\u9001\u4fe1\u53f7\u6216\u8005\u6355\u83b7\u4fe1\u53f7\uff0c\u5728\u6b64\u505a\u4e00\u4e9b\u8bb0\u5f55\u3002<\/p>\n\n\n\n

\u5b9e\u9645\u4e0a\uff0c\u4fe1\u53f7\u5bf9\u4e8eLinux\u7cfb\u7edf\u975e\u5e38\u91cd\u8981\uff0cLinux\u5185\u6838\u901a\u8fc7\u4fe1\u53f7\u6765\u7ba1\u7406\u6211\u4eec\u6bcf\u4e2a\u8fdb\u7a0b\u7684\u884c\u4e3a\uff0c\u5e76\u4e14\u6211\u4eec\u5728\u65e5\u5e38\u5f00\u53d1\u6216\u8005\u8c03\u8bd5\u65f6\u4e5f\u9700\u8981\u5bf9\u4fe1\u53f7\u8fdb\u884c\u64cd\u4f5c\u3002\u4e00\u822c\u6211\u4eec\u4f1a\u6d89\u53ca\u5230\u4e24\u4e2a\u64cd\u4f5c\uff0c\u4fe1\u53f7\u7684\u53d1\u9001<\/strong>\u4e0e\u4fe1\u53f7\u7684\u6355\u83b7<\/strong>\u3002<\/p>\n\n\n\n

\u5173\u4e8e\u4fe1\u53f7\u662f\u600e\u4e48\u4ea7\u751f\u7684\uff0c\u5927\u4f53\u5206\u4e3a\u786c\u4ef6\u65b9\u5f0f\u4e0e\u8f6f\u4ef6\u65b9\u5f0f\uff0c\u786c\u4ef6\u65b9\u5f0f\u6bd4\u5982\u6211\u4eec\u952e\u76d8\u5185\u6309\u4e0bCtrl+C\u7ec4\u5408\u952e\uff0c\u6b64\u65f6\u5373\u4ea7\u751f\u4e2d\u65ad\u4fe1\u53f7\uff1b\u800c\u8f6f\u4ef6\u65b9\u5f0f\u5219\u901a\u8fc7Kill\/Sigqueue\u7b49\u51fd\u6570\/\u547d\u4ee4\u8fdb\u884c\u53d1\u9001\u5373\u53ef\u3002<\/p>\n\n\n\n

\u67e5\u770b\u7cfb\u7edf\u6240\u6709\u7684\u4fe1\u53f7\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7kill\u547d\u4ee4\u6765\u67e5\u770b\uff0c\u5728shell\u7ec8\u7aef\u5185\u8f93\u5165kill -l\u547d\u4ee4\u5373\u53ef\u67e5\u770b\u6240\u6709\u7684Signal\uff1a<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u5f53\u6211\u4eec\u7684\u7a0b\u5e8f\u6536\u5230\u8fd9\u4e9b\u4fe1\u53f7\u65f6\uff0c\u90fd\u4f1a\u5b58\u5728\u5bf9\u5e94\u7684\u8f6f\u4e2d\u65ad\u6765\u5bf9\u505a\u51fa\u76f8\u5e94\u7684\u54cd\u5e94\u3002\u800c\u8fdb\u7a0b\u5bf9\u4e8e\u4e0d\u540c\u7684\u4fe1\u53f7\u7684\u54cd\u5e94\u662f\u5404\u4e0d\u76f8\u540c\u7684\u3002\u5f53\u524d\u5b58\u5728\u7684\u9ed8\u8ba4\u884c\u4e3a\u5b58\u5728\u4ee5\u4e0b\u51e0\u7c7b\uff1a<\/p>\n\n\n\n

TERM\uff1a\u9ed8\u8ba4\u6536\u5230\u4fe1\u53f7\u540e\u7ed3\u675f\u8be5\u8fdb\u7a0b<\/p>\n\n\n\n

IGN:\u9ed8\u8ba4\u6536\u5230\u4fe1\u53f7\u540e\u8fdb\u884c\u5ffd\u7565\uff0c\u4e0d\u505a\u4efb\u4f55\u54cd\u5e94<\/p>\n\n\n\n

CORE:\u9ed8\u8ba4\u6536\u5230\u4fe1\u53f7\u540e\u7ed3\u675f\u8fdb\u7a0b\uff0c\u5e76\u8fdb\u884ccore dump<\/p>\n\n\n\n

STOP:\u9ed8\u8ba4\u6536\u5230\u4fe1\u53f7\u540e\u505c\u6b62\u8fdb\u7a0b<\/p>\n\n\n\n

CONT:\u9ed8\u8ba4\u6536\u5230\u4fe1\u53f7\u540e\u5982\u8fdb\u7a0b\u5904\u7406\u505c\u6b62\u72b6\u6001\uff0c\u5219\u7ee7\u7eed\u8fd0\u884c\u3002<\/p>\n\n\n\n

\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6807\u51c6\u4fe1\u53f7\u53ca\u5176\u9ed8\u8ba4\u884c\u4e3a\u7684\u4e00\u4e2a\u6574\u7406\uff1a<\/p>\n\n\n\n

Signal<\/th>Action<\/th>Remark<\/th><\/tr><\/thead>
SIGABRT<\/td>CORE<\/td>\u7ed3\u675f\u8fdb\u7a0b\uff0c\u7531abort\uff08\uff09\u51fd\u6570\u4ea7\u751f<\/td><\/tr>
SIGALRM<\/td>TERM<\/td>\u7ed3\u675f\u8fdb\u7a0b\uff0c\u7531alarm\uff08\uff09\u51fd\u6570\u4ea7\u751f<\/td><\/tr>
SIGBUS<\/td>CORE<\/td>Bus Error\uff08bad memory access\uff09\uff0c\u5730\u5740\u603b\u7ebf\u5bfb\u5740\u9519\u8bef<\/td><\/tr>
SIGCHILD<\/td>IGN<\/td>\u5b50\u8fdb\u7a0b\u505c\u6b62\u6216\u8005\u7ed3\u675f<\/td><\/tr>
SIGCONT<\/td>CONT<\/td>\u5982\u679c\u5f53\u524d\u5904\u4e8e\u505c\u6b62\u72b6\u6001\u5219\u7ee7\u7eed<\/td><\/tr>
SIGINT<\/td>TERM<\/td>\u4ece\u952e\u76d8\u63a5\u6536\u7684\u4e2d\u65ad\u8f93\u5165<\/td><\/tr>
SIGKILL<\/td>TERM<\/td>\u5f3a\u5236\u7ec8\u6b62\u8fdb\u7a0b\u4fe1\u53f7<\/td><\/tr>
SIGPIPE<\/td>TERM<\/td>Broken pipe\uff1a\u5199\u5165\u6570\u636e\u8f93\u51fa\u81f3\u7ba1\u9053\u5374\u6ca1\u6709reader<\/td><\/tr>
SIGSEGV<\/td>CORE<\/td>\u65e0\u6548\u7684\u5730\u5740\u4f7f\u7528<\/td><\/tr>
SIGSYS<\/td>CORE<\/td>\u65e0\u6548\u7684\u7cfb\u7edf\u8c03\u7528<\/td><\/tr>
SIGTERM<\/td>TERM<\/td>\u7ed3\u675f\u8fdb\u7a0b<\/td><\/tr>
SIGTRAP<\/td>CORE<\/td>\u7a0b\u5e8f\u9677\u5165\u786c\/\u8f6f\u4e2d\u65ad\u800c\u88abReset<\/td><\/tr>
SIGXCPU<\/td>TERM <\/td>CPU\u65f6\u95f4\u7247\u4f7f\u7528\u8d85\u8fc7\u9650\u5b9a<\/td><\/tr>
SIGXFSZ<\/td>CORE<\/td>\u6587\u4ef6\u5927\u5c0f\u8d85\u8fc7\u9650\u5b9a<\/td><\/tr>
SIGPWR<\/td>TERM<\/td>\u7ec8\u6b62\u8fdb\u7a0b\uff0c\u7cfb\u7edf\u5173\u673a<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u4fe1\u53f7\u53d1\u9001<\/h4>\n\n\n\n

\u4fe1\u53f7\u53d1\u9001\u901a\u5e38\u53d1\u9001\u81f3\u7cfb\u7edf\u5185\u6838\u6216\u8005\u5176\u4ed6\u8fdb\u7a0b\uff0c\u7528\u4e8e\u72b6\u6001\u540c\u6b65\u3002<\/p>\n\n\n\n

1.\u4f7f\u7528raise\u51fd\u6570<\/em><\/strong><\/p>\n\n\n\n

\u4f7f\u7528raise\u51fd\u6570\u9700\u8981\u5f15\u5165<signal.h>\u5934\u6587\u4ef6\u3002<\/p>\n\n\n\n

\u51fd\u6570\u539f\u578b\uff1aint raise(int sig);<\/p>\n\n\n\n

raise\u51fd\u6570\u5c06\u4f1a\u7ed9\u53d1\u9001\u4fe1\u53f7\u7ed9\u8c03\u7528\u65b9\uff0c\u5728\u5355\u7ebf\u7a0b\/\u8fdb\u7a0b\u4e2d\u7b49\u4ef7\u4e8ekill(getpid(),sig),\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u7b49\u4ef7\u4e8epkill\uff0c\u5176\u4e2dsig\u4ee3\u8868\u53d1\u9001\u7684\u4fe1\u53f7\u3002<\/p>\n\n\n\n

\u8fd4\u56de\u503c\uff1a\u8fd4\u56de0\u4ee3\u8868\u6210\u529f\uff0c\u975e0\u5219\u4ee3\u8868\u5931\u8d25<\/p>\n\n\n\n

2.\u4f7f\u7528kill\u51fd\u6570<\/strong><\/em><\/p>\n\n\n\n

\u4f7f\u7528kill\u51fd\u6570\u540c\u6837\u5730\u9700\u8981\u5f15\u5165<signal.h>\u5934\u6587\u4ef6\u3002<\/p>\n\n\n\n

\u51fd\u6570\u539f\u578b\uff1aint kill(pid_t pid,int sig);<\/p>\n\n\n\n

kill\u51fd\u6570\u5c06\u4f1a\u53d1\u9001\u7279\u5b9a\u4fe1\u53f7\u7ed9\u7279\u5b9a\u7684\u8fdb\u7a0b\uff0c\u5177\u4f53\u662f\u54ea\u4e9b\u8fdb\u7a0b\u5c06\u4f1a\u7531pid\u53c2\u6570\u51b3\u5b9a\u3002<\/p>\n\n\n\n

\u5173\u4e8epid\u7684\u53c2\u6570\u8bbe\u5b9a\uff0c\u9075\u5faa\u5982\u4e0b\u89c4\u5219\uff1a<\/p>\n\n\n\n

pid>0:\u53d1\u9001\u4fe1\u53f7\u5230\u6307\u5b9a\u8fdb\u7a0b<\/p>\n\n\n\n

pid=0:\u53d1\u9001\u4fe1\u53f7\u5230\u8be5\u8fdb\u7a0b\u6240\u5728\u8fdb\u7a0b\u7ec4\u5185\u7684\u6240\u6709\u8fdb\u7a0b<\/p>\n\n\n\n

pid=-1:\u53d1\u9001\u4fe1\u53f7\u7ed9\u5f53\u524d\u7528\u6237\u6709\u6743\u9650\u53d1\u9001\u4fe1\u53f7\u7684\u6240\u6709\u8fdb\u7a0b<\/p>\n\n\n\n

pid<-1:\u53d1\u9001\u4fe1\u53f7\u7ed9\u6307\u5b9a\u8fdb\u7a0b\u7ec4\u5185\u7684\u6240\u6709\u8fdb\u7a0b\uff0c\u5176\u4e2d\u8fdb\u7a0b\u7ec4\u53d6pid\u7684\u7edd\u5bf9\u503c<\/p>\n\n\n\n

\u8fd4\u56de\u503c\uff1a\u5982\u679c\u8c03\u7528\u6210\u529f\uff0c\u5219\u8fd4\u56de0\uff0c\u5426\u5219\u8fd4\u56de-1.\u540c\u65f6\u4ea7\u751f\u76f8\u5e94\u7684errno\u4fe1\u53f7\uff0c\u4f7f\u7528strerror\u51fd\u6570\u6253\u5370\u5373\u53ef\u67e5\u770b\uff0c\u8fd9\u91cc\u5217\u51fa\u5404\u4e2aerrno\u4fe1\u53f7\u7684\u9519\u8bef\u4fe1\u606f\uff1a<\/p>\n\n\n\n

EINVAL<\/strong>\uff1a\u53d1\u9001\u7684sig\u4e3a\u65e0\u6548\u503c\u3002<\/p>\n\n\n\n

EPERM<\/strong>\uff1a \u8868\u660e\u4fe1\u53f7\u53d1\u9001\u65b9\u65e0\u6743\u53d1\u9001\u4fe1\u53f7\u7ed9\u5f85\u63a5\u6536\u65b9\u3002 <\/p>\n\n\n\n

ESRCH<\/strong>\uff1a \u8868\u660e\u6ca1\u6709\u5339\u914did\u7684\u8fdb\u7a0b\u6216\u8005\u8fdb\u7a0b\u7ec4\u3002 <\/p>\n\n\n\n

3.\u4f7f\u7528sigqueue\u51fd\u6570<\/strong><\/em><\/p>\n\n\n\n

sigqueue\u76f8\u5bf9\u4e8ekill\u662f\u5177\u6709\u66f4\u9ad8\u7075\u6d3b\u5ea6\u7684\u4e00\u4e2a\u51fd\u6570\uff0c\u4f7f\u7528sigqueue\u51fd\u6570\u540c\u6837\u9700\u8981\u5f15\u5165<signal.h>\u5934\u6587\u4ef6\u3002<\/p>\n\n\n\n

\u51fd\u6570\u539f\u578b\uff1aint sigqueue(pid_t pid, int sig, const union sigval value);<\/p>\n\n\n\n

\u5176\u4e2dpid\u7528\u4e8e\u6307\u5b9a\u5c06\u8981\u53d1\u9001\u4fe1\u53f7\u7684\u8fdb\u7a0bid\uff0csig\u7528\u4e8e\u6307\u5b9a\u4fe1\u53f7\uff0cvalue\u5219\u662f\u4e00\u4e2a\u8054\u5408\u4f53\uff0c\u7528\u4e8e\u5728\u53d1\u9001\u4fe1\u53f7\u65f6\u4f20\u9012\u4e00\u4e9b\u9644\u52a0\u5185\u5bb9\uff0c\u5173\u4e8esigval\u8054\u5408\u4f53\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n

union sigval {\n      int   sival_int;\n      void *sival_ptr;\n };<\/code><\/pre>\n\n\n\n
\u8fd4\u56de\u503c\uff1a\u82e5\u8c03\u7528\u6210\u529f\uff0c\u5219\u8fd4\u56de0\uff1b\u8fd4\u56de-1\u5219\u8c03\u7528\u5931\u8d25\uff0c\u5e76\u751f\u6210\u5bf9\u5e94\u7684errno\u4fe1\u53f7\u3002\u5404\u4e2aerrno\u9519\u8bef\u4fe1\u53f7\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n
EAGAIN<\/strong>:\u8868\u660e\u5f53\u524d\u8fdb\u5165queue\u72b6\u6001\u7684\u4fe1\u53f7\u5df2\u8fbe\u4e0a\u9650\u3002<\/p>\n\n\n\n
EINVAL<\/strong>:\u8868\u660esig\u53c2\u6570\u65e0\u6548\u3002<\/p>\n\n\n\n
EPERM<\/strong>:\u8868\u660e\u4fe1\u53f7\u53d1\u9001\u65b9\u65e0\u6743\u53d1\u9001\u4fe1\u53f7\u7ed9\u5f85\u63a5\u6536\u65b9\u3002<\/p>\n\n\n\n
ESRCH<\/strong>:\u8868\u660e\u6ca1\u6709\u5339\u914did\u7684\u8fdb\u7a0b\u6216\u8005\u8fdb\u7a0b\u7ec4\u3002<\/p>\n\n\n\n
\u9664\u4e86\u4ee5\u4e0a\u8fd9\u4e9b\u6bd4\u8f83\u901a\u7528\u7684\u4fe1\u53f7\u53d1\u9001\u51fd\u6570\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u4e13\u7528\u7684\u4fe1\u53f7\u53d1\u9001\u51fd\u6570\uff0c\u5982alarm\u51fd\u6570\u3001abort\u51fd\u6570\u7b49\uff0c\u6b64\u5904\u4e0d\u505a\u5c55\u5f00\u3002<\/p>\n\n\n\n
\u4fe1\u53f7\u6355\u83b7<\/h4>\n\n\n\n
\u6709\u4e9b\u65f6\u5019\u6211\u4eec\u7684\u7a0b\u5e8f\u4f1a\u4e0d\u53ef\u907f\u514d\u7684\u5d29\u6e83\u6216\u8005\u88ab\u7cfb\u7edfKill\u6216\u8005\u88ab\u4e2d\u65ad\uff0c\u6b64\u65f6\u9700\u8981\u6355\u83b7\u4fe1\u53f7\u6765\u505a\u4e00\u4e9b\u5f02\u5e38\u5904\u7406\uff0c\u6216\u8005\u8bf4\u662f\u8fdb\u7a0b\u9000\u51fa\u524d\u7684\u4e00\u4e9b\u6e05\u7406\u5de5\u4f5c\u3002\u8fd9\u91cc\u53ef\u4ee5\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5728Android\u7cfb\u7edf\u4e2d,Vold\u5b50\u7cfb\u7edf\u4f1a\u76d1\u63a7\u8bb0\u5f55\u6bcf\u4e2a\u8fdb\u7a0b\u5bf9\u7cfb\u7edf\u8d44\u6e90\u7684\u5360\u7528\uff0c\u6bd4\u5982U\u76d8\uff0c\u5982\u5728\u62d4\u51faU\u76d8\u65f6\u8fd8\u5b58\u5728\u8d44\u6e90\u5360\u7528\u5c31\u4f1a\u5148\u53d1\u9001SIGINT\u4fe1\u53f7\u63d0\u793a\u5e94\u7528\u8fdb\u884c\u8d44\u6e90\u91ca\u653e\uff0c\u5982\u672a\u91ca\u653e\u8d44\u6e90\u5219\u4f1a\u53d1\u9001SIGKILL\u4fe1\u53f7\u8fdb\u884c\u5f3a\u5236Kill\u3002\u90a3\u4e48\u8fd9\u65f6\u5019\u6211\u4eec\u5c31\u9700\u8981\u53bb\u8fdb\u884c\u4fe1\u53f7\u7684\u6355\u83b7\u3002<\/p>\n\n\n\n
1.\u4f7f\u7528signal\u51fd\u6570<\/em><\/strong><\/p>\n\n\n\n
\u4f7f\u7528signal\u51fd\u6570\u540c\u6837\u9700\u8981\u5f15\u5165\u5934\u6587\u4ef6 <signal.h> \u3002<\/p>\n\n\n\n
\u51fd\u6570\u539f\u578b\uff1asighandler_t signal(int signum, sighandler_t handler);<\/p>\n\n\n\n
\u8fd9\u91cc sighandler_t  \u6307\u4ee3\u4e00\u4e2a\u51fd\u6570\u6307\u9488\uff0c\u4e00\u822c\u5b9a\u4e49\u4e3atypedef void (*sighandler_t)(int);<\/strong><\/p>\n\n\n\n
\u5176\u4e2d\u9ed8\u8ba4\u7684handler\u5206\u4e3a\u4e24\u7c7b\uff1aSIG_IGN\u4e0eSIG_DFL\uff0c\u524d\u8005\u8868\u793a\u5ffd\u7565\u4fe1\u53f7\uff0c\u540e\u8005\u8868\u793a\u91c7\u53d6\u9ed8\u8ba4\u884c\u4e3a\u3002\u4f7f\u7528signal\u51fd\u6570\uff0c\u5c31\u53ef\u4ee5\u6355\u83b7\u5230\u4fe1\u53f7\uff0c\u6309\u7167\u6211\u4eec\u8bbe\u5b9a\u7684handler\u8fdb\u884c\u4fe1\u53f7\u6355\u83b7\u540e\u7684\u5904\u7406\u3002\u8fd9\u91cc\u9700\u8981\u8bf4\u660e\uff0cSIGKILL\u4e0eSIGSTOP\u662f\u4e0d\u53ef\u88ab\u6355\u83b7\u7684\u3002<\/p>\n\n\n\n
\u8fd4\u56de\u503c\uff1a\u6b63\u5e38\u8fd4\u56de sighandler \u4e4b\u524d\u7684\u503c\uff0c\u5426\u5219\u8fd4\u56deSIG_ERR\u9519\u8bef\u3002<\/p>\n\n\n\n
\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n\n\n\n
#include <signal.h>\n#include <stdlib.h>\n#include <stdio.h>\n#include <unistd.h>\n\n\/\/function declaration\nvoid signalHander(int signum);\n\nvoid signalHandler(int signum)\n{\n  printf(\"We received a signal:%d\\r\\n\",signum);\n  exit(0);\n}\n\nvoid main(void)\n{\n  printf(\"Now we start run\\r\\n\");\n  \/\/\u6355\u83b7SIGINT\u4fe1\u53f7\n  signal(SIGINT,signalHandler);\n  for(;;)\n  {\n      printf(\"Not received any signal,just sleep 1 s\\r\\n\");\n      sleep(1);\n  }\n\n}<\/code><\/pre>\n\n\n\n
2.\u4f7f\u7528sigaction\u51fd\u6570<\/em><\/strong><\/p>\n\n\n\n
\u4f7f\u7528sigaction\u51fd\u6570\u540c\u6837\u9700\u8981\u5f15\u5165\u5934\u6587\u4ef6  <signal.h> \u3002 <\/p>\n\n\n\n
\u51fd\u6570\u539f\u578b\uff1aint sigaction(int<\/strong> signum<\/em>, const struct sigaction *<\/strong>act<\/em>,struct sigaction *<\/strong>oldact<\/em>);<\/strong><\/p>\n\n\n\n
\u5176\u4e2dsignum\u53c2\u6570\u7528\u4e8e\u6307\u5b9a\u8981\u6355\u83b7\u7684\u4fe1\u53f7\uff0cact\u4e3a\u6355\u83b7\u4fe1\u53f7\u540e\u7684\u884c\u4e3a\uff0c\u800coldact\u7528\u4e8e\u50a8\u5b58\u4e4b\u524d\u7684act\u3002\u8fd9\u8868\u660e\uff0c\u5b9e\u9645\u4e0a\u6211\u4eec\u662f\u53ef\u4ee5\u591a\u6b21\u4f7f\u7528 sigaction<\/strong> \u5e76\u8bbe\u7f6e\u4e0d\u540c\u7684act\u6765\u5b9e\u73b0\u4e0d\u540c\u7684\u54cd\u5e94\u3002<\/p>\n\n\n\n
\u5176\u4e2d sigaction <\/strong> \u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n
struct sigaction {\n    void     (*sa_handler)(int);\n    void     (*sa_sigaction)(int, siginfo_t *, void *);\n    sigset_t   sa_mask;\n    int        sa_flags;\n    void     (*sa_restorer)(void);\n};\n\/\/siginfo_t\u5b9a\u4e49\u5982\u4e0b\nsiginfo_t {\n    int      si_signo;    \/* Signal number *\/\n    int      si_errno;    \/* An errno value *\/\n    int      si_code;     \/* Signal code *\/\n    int      si_trapno;   \/* Trap number that caused\n                             hardware-generated signal\n                             (unused on most architectures) *\/\n    pid_t    si_pid;      \/* Sending process ID *\/\n    uid_t    si_uid;      \/* Real user ID of sending process *\/\n    int      si_status;   \/* Exit value or signal *\/\n    clock_t  si_utime;    \/* User time consumed *\/\n    clock_t  si_stime;    \/* System time consumed *\/\n    sigval_t si_value;    \/* Signal value *\/\n    int      si_int;      \/* POSIX.1b signal *\/\n    void    *si_ptr;      \/* POSIX.1b signal *\/\n    int      si_overrun;  \/* Timer overrun count; POSIX.1b timers *\/\n    int      si_timerid;  \/* Timer ID; POSIX.1b timers *\/\n    void    *si_addr;     \/* Memory location which caused fault *\/\n    long     si_band;     \/* Band event (was int in\n                             glibc 2.3.2 and earlier) *\/\n    int      si_fd;       \/* File descriptor *\/\n    short    si_addr_lsb; \/* Least significant bit of address\n                             (since kernel 2.6.32) *\/\n}<\/code><\/pre>\n\n\n\n
sigaction\u51fd\u6570\u8fd4\u56de\u503c\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n
EFAULT<\/strong>\uff1aact\/oldact\u7684\u5185\u5b58\u5730\u5740\u5e76\u975e\u6709\u6548\u7684\u5730\u5740\u7a7a\u95f4\u3002<\/p>\n\n\n\n
EINVAL<\/strong>\uff1a\u6307\u5b9a\u7684\u4fe1\u53f7\u65e0\u6548\uff08\u540c\u6837\u7684\uff0cSIGKILL\u4e0eSIGSTOP\u65e0\u6cd5\u88ab\u6355\u83b7\uff09\u3002<\/p>\n\n\n\n
\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n\n\n\n
void sigHandler(int sig)\n{\n    \u2026\u2026\n    exit(EXIT_FAILURE);\n}\n\nvoid registerSigHandler()\n{\n    struct sigaction sa;\n    sigemptyset(&sa.sa_mask);\n    sa.sa_flags = 0;\n    \/\/\u8bbe\u5b9a\u63a5\u6536\u5230\u7279\u5b9a\u4fe1\u53f7\u4e4b\u540e\u7684handler\u5904\u7406\n    sa.sa_handler = sigHandler;\n    \/\/\u6355\u83b7SIGABRT\n    sigaction(SIGABRT, &sa, nullptr);\n    \/\/\u6355\u83b7SIGTERM\n    sigaction(SIGTERM, &sa, nullptr);\n    \/\/\u6355\u83b7SIGINT\n    sigaction(SIGINT, &sa, nullptr);\n}<\/code><\/pre>\n\n\n\n
<\/p>\n        
\n            
\n                \n                
\n                    \n                        \"Happy\"\n                    <\/a>\n                    
\n                        Happy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sad\"\n                    <\/a>\n                    
\n                        Sad                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Excited\"\n                    <\/a>\n                    
\n                        Excited                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sleepy\"\n                    <\/a>\n                    
\n                        Sleepy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Angry\"\n                    <\/a>\n                    
Angry<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                        \n                    <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Surprise\"\n                    <\/a>\n                    
Surprise<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n            <\/div>\n        <\/div>","protected":false},"excerpt":{"rendered":"
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