{"id":51974,"date":"2024-12-03T14:29:34","date_gmt":"2024-12-03T06:29:34","guid":{"rendered":"https:\/\/fwq.ai\/blog\/51974\/"},"modified":"2024-12-03T14:29:34","modified_gmt":"2024-12-03T06:29:34","slug":"linux-signal%e7%9a%84%e4%bd%9c%e7%94%a8%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/51974\/","title":{"rendered":"linux signal\u7684\u4f5c\u7528\u662f\u4ec0\u4e48"},"content":{"rendered":"

<\/b> <\/p>\n

linux signal\u7684\u4f5c\u7528\u662f\u4ec0\u4e48<\/h1>\n

\u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587\u300alinux signal\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\u300b<\/span>\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01<\/p>\n<\/p>\n

\n

linux signal\u7528\u6765\u901a\u77e5\u8fdb\u7a0b\u67d0\u4e2a\u7279\u5b9a\u4e8b\u4ef6\u7684\u53d1\u751f\u6216\u8005\u662f\u8ba9\u8fdb\u7a0b\u6267\u884c\u67d0\u4e2a\u7279\u5b9a\u7684\u5904\u7406\u51fd\u6570\uff1bsignal\u5373\u4fe1\u53f7\uff0c\u662fUnix\u5bb6\u65cf\u4e2d\u4e00\u4e2a\u53e4\u8001\u7684\u901a\u4fe1\u673a\u5236\uff1b\u4fe1\u53f7\u53ef\u4ee5\u6765\u81ea\u7ec8\u7aef\u7684\u952e\u76d8\u5b57\u7b26\u8f93\u5165\uff0c\u6bd4\u5982control-C\u89e6\u53d1\u7684SIGINIT\uff0c\u4e5f\u53ef\u4ee5\u6765\u81ea\u4e0e\u786c\u4ef6\u6216\u8f6f\u4ef6\u6709\u5173\u7684\u5f02\u5e38\uff0c\u6bd4\u5982\u5e94\u7528\u7a0b\u5e8f\u8bbf\u95ee\u4e86\u65e0\u6548\u5730\u5740\u89e6\u53d1\u7684SIGSEGV\uff0c\u5b9a\u65f6\u5668\u5230\u671f\u89e6\u53d1\u7684SIGALARM\u7b49\u3002<\/p>\n<\/blockquote>\n

linux signal\u7528\u6765\u505a\u4ec0\u4e48\uff1f<\/strong><\/p>\n

Linux\u4e2d\u7684\u4fe1\u53f7\u5904\u7406\u673a\u5236<\/p>\n

\u4fe1\u53f7(Signal)\u662fUnix\u5bb6\u65cf\u4e2d\u4e00\u4e2a\u53e4\u8001\u7684\u901a\u4fe1\u673a\u5236\uff0c\u4e3b\u8981\u7528\u6765\u901a\u77e5\u8fdb\u7a0b\u67d0\u4e2a\u7279\u5b9a\u4e8b\u4ef6\u7684\u53d1\u751f\uff0c\u6216\u8005\u662f\u8ba9\u8fdb\u7a0b\u6267\u884c\u67d0\u4e2a\u7279\u5b9a\u7684\u5904\u7406\u51fd\u6570\u3002\u8bf4\u5b83\u53e4\u8001\uff0c\u662f\u56e0\u4e3a\u5b83\u5728\u7b2c\u4e00\u4ee3Unix\u7cfb\u7edf\u4e2d\u5c31\u5df2\u7ecf\u5b58\u5728\u4e86\u3002<\/p>\n

\u4fe1\u53f7\u7684\u53d1\u9001<\/strong><\/h3>\n

\u4fe1\u53f7\u53ef\u4ee5\u6765\u81ea\u7ec8\u7aef(terminal)\u7684\u952e\u76d8\u5b57\u7b26\u8f93\u5165\uff0c\u6bd4\u5982control-C\u89e6\u53d1\u7684SIGINIT\uff1b\u4e5f\u53ef\u4ee5\u6765\u81ea\u4e0e\u786c\u4ef6\u6216\u8f6f\u4ef6\u6709\u5173\u7684\u5f02\u5e38\uff0c\u6bd4\u5982\u5e94\u7528\u7a0b\u5e8f\u8bbf\u95ee\u4e86\u65e0\u6548\u5730\u5740\u89e6\u53d1\u7684SIGSEGV(segmentation fault)\uff0c\u5b9a\u65f6\u5668\u5230\u671f\u89e6\u53d1\u7684SIGALARM\u7b49\u3002\u8fd9\u4e9b\u4fe1\u53f7\u90fd\u662f\u7531\u5185\u6838\u53d1\u9001\u7ed9\u8fdb\u7a0b\u7684\u3002<\/p>\n

\u8fdb\u7a0b\u6536\u5230\u7684\u4fe1\u53f7\u8fd8\u53ef\u4ee5\u6765\u81ea\u4e8e\u5176\u4ed6\u8fdb\u7a0b\u3002\u4f46\u4e0d\u662f\u6240\u6709\u7684\u8fdb\u7a0b\u90fd\u53ef\u4ee5\u5411\u5176\u4ed6\u4efb\u610f\u4e00\u4e2a\u8fdb\u7a0b\u53d1\u9001\u4fe1\u53f7\uff0c\u53ea\u6709\u5177\u6709root\u6743\u9650\u7684super user\u624d\u53ef\u4ee5\u8fd9\u4e48\u505a\uff0c\u5bf9\u4e8e\u666e\u901auser\u7684\u8fdb\u7a0b\uff0c\u53ea\u80fd\u5411\u5c5e\u4e8e\u540c\u4e00user\u7684\u8fdb\u7a0b\u53d1\u9001\u4fe1\u53f7\u3002<\/p>\n

\u90a3\u8fdb\u7a0b\u53ef\u4ee5\u5411\u5185\u6838\u53d1\u9001\u4fe1\u53f7\u5417\uff1f\u53ef\u4ee5\u662f\u53ef\u4ee5\uff0c\u4f46\u5185\u6838\u7ebf\u7a0b\u662f\u4e0d\u4f1a\u54cd\u5e94\u7684\uff0c\u53d1\u4e86\u4e5f\u767d\u53d1\uff0c\u9664\u975e\u2026\u2026\u4f60\u4fee\u6539\u5185\u6838\u4ee3\u7801\u3002<\/p>\n

\u901a\u5e38\u4fe1\u53f7\u88ab\u8ba4\u4e3a\u662f\u4e00\u79cd\u5f02\u6b65\u7684\u673a\u5236\uff0c\u4f46\u662f\u5728Linux\u7684\u4ee3\u7801\u4e2d\uff0c\u4ee5\u4e0b\u7531\u5f02\u5e38\u5f15\u8d77\u7684\u4fe1\u53f7\u4e5f\u88ab\u79f0\u4e3a”synchronous”\u7684\uff1a<\/p>\n

#define SYNCHRONOUS_MASK \\\t(sigmask(SIGSEGV) | sigmask(SIGBUS) | sigmask(SIGILL) | \\\t sigmask(SIGTRAP) | sigmask(SIGFPE) | sigmask(SIGSYS))\r\n<\/pre>\n
\u8fd9\u91cc\u6211\u4eec\u79f0\u63a5\u6536\u4fe1\u53f7\u7684\u8fdb\u7a0b\u4e3a\u201c\u76ee\u6807\u8fdb\u7a0b\u201d\u3002\u4f20\u7edf\u7684\u4fe1\u53f7\u53d1\u9001\u51fd\u6570\u662fkill<\/strong>()\uff0c\u8fd9\u540d\u5b57\u770b\u8d77\u6765\u597d\u5413\u4eba\uff0c\u611f\u89c9\u597d\u50cf\u662f\u76ee\u6807\u8fdb\u7a0b\u9a6c\u4e0a\u5c31\u8981\u88ab\u201c\u6740\u201d\u6389\u4e86\u3002\u4e8b\u5b9e\u4e0a\uff0c\u867d\u7136\u5404\u8def\u4fe1\u53f7\u90fd\u7528kill()\u6765\u53d1\u9001\uff0c\u4f46\u771f\u6b63\u8981”kill”\u6389\u8fdb\u7a0b\u7684\uff0c\u53ea\u5360\u4e00\u5c0f\u90e8\u5206\u3002\u5f53\u7136\uff0c\u73b0\u5728\u5df2\u7ecf\u6709\u4e86\u529f\u80fd\u66f4\u5f3a\uff0c\u540d\u5b57\u4e5f\u66f4\u53cb\u597d\u7684sigqueue<\/strong>()\u4e86\u3002<\/p>\n
\u6765\u770b\u4e0b\u4e24\u8005\u7684\u51fd\u6570\u539f\u578b\uff1a<\/p>\n
int kill(pid_t pid, int sig);int sigqueue(pid_t pid, int sig, const union sigval value);\r\n<\/pre>\n
pid<\/strong>\u4ee3\u8868\u76ee\u6807\u8fdb\u7a0b\u7684PID\u3002Linux\u4e2d\u8fdb\u7a0b\u7684PID\u90fd\u662f\u6b63\u6570\uff0c\u90a3\u53c2\u6570pid\u7684\u503c\u5982\u679c\u662f0\u6216\u8005\u8d1f\u6570\uff0c\u662f\u4e0d\u662f\u5c31\u662f\u975e\u6cd5\u7684\u5462\uff1f\u975e\u4e5f\uff0c\u4e8b\u5b9e\u4e0a\uff0c0\u548c\u8d1f\u6570\u5728\u8fd9\u91cc\u90fd\u662f\u6709\u5176\u4ed6\u7528\u9014\u7684\u3002Linux\u91cc\u6709\u4e2a\u8fdb\u7a0b\u7ec4\u7684\u6982\u5ff5(process group)\uff0c\u8868\u793a\u4e00\u7c7b\u8fdb\u7a0b\u7684\u96c6\u5408\u3002\u5728kill()\u4e2d\uff0c\u53c2\u6570pid\u4e3a”0″\u8bf4\u660e\u4fe1\u53f7\u662f\u53d1\u7ed9\u5f53\u524d\u8fdb\u7a0b\u6240\u5728\u8fdb\u7a0b\u7ec4\u7684\u6240\u6709\u8fdb\u7a0b\uff0c\u5c0f\u4e8e”-1″\u5219\u662f\u5411\u7f16\u53f7\u4e3a-pid\u7684\u8fdb\u7a0b\u7ec4\u53d1\u9001\u4fe1\u53f7\u3002<\/p>\n
__kill_pgrp_info(sig, info, pid ? find_vpid(-pid) : task_pgrp(current));\r\n<\/pre>\n
pid\u4e3a”-1″\u8868\u793a\u53d1\u9001\u7ed9\u9664Init\u8fdb\u7a0b\u548c\u81ea\u8eab\u4ee5\u5916\u7684\u6240\u6709\u8fdb\u7a0b\uff0c\u6216\u8005\u8bf4\u662f\u9664\u81ea\u8eab\u4ee5\u5916\u7684\u6240\u6709pid\u5927\u4e8e1\u7684\u8fdb\u7a0b\u3002<\/p>\n
for_each_process(p) {\r\n\tif (task_pid_vnr(p) > 1 && !same_thread_group(p, current)) \r\n            ...\r\n<\/pre>\n
\u5982\u679c\u8fd9\u91ccpid\u662f\u8fdb\u7a0b\u81ea\u5df1\u7684PID\uff0c\u90a3\u4e48\u5c31\u662f\u8fdb\u7a0b\u7ed9\u81ea\u8eab\u53d1\u9001\u4fe1\u53f7\u3002\u4e3a\u6b64\uff0cLinux\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e2a\u66f4\u7b80\u6d01\u7684\u63a5\u53e3\uff1araise()\u51fd\u6570\u3002<\/p>\n
kill(getpid(), sig) --> raise(sig)\r\n<\/pre>\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728sigqueue()\u4e2d\uff0c\u4e0d\u80fd\u901a\u8fc7\u5c06\u53c2\u6570pid\u7684\u503c\u8bbe\u4e3a\u8d1f\u6570\u6765\u5411\u6574\u4e2a\u8fdb\u7a0b\u7ec4\u53d1\u9001\u4fe1\u53f7\u3002<\/p>\n
sig<\/strong>\u4ee3\u8868\u8981\u53d1\u9001\u4fe1\u53f7\u7684\u7f16\u53f7\uff0cLinux\u4e2d\u7684\u4fe1\u53f7\u7f16\u53f7\u662f\u4ece1\u5f00\u59cb\u7684\uff0c\u90a3\u53c2\u6570sig\u7684\u503c\u5982\u679c\u4e3a0\u4f1a\u600e\u6837\u5462\uff1f\u8fd9\u91cc\u76840\u4e5f\u6709\u5999\u7528\uff0csig\u4e3a”0″\u65f6\u5e76\u4e0d\u4f1a\u771f\u6b63\u7684\u5f80\u76ee\u6807\u8fdb\u7a0b(\u6216\u8fdb\u7a0b\u7ec4)\u53d1\u9001\u4fe1\u53f7\uff0c\u800c\u662f\u7528\u6765\u68c0\u6d4b\u76ee\u6807\u8fdb\u7a0b(\u6216\u8fdb\u7a0b\u7ec4)\u662f\u5426\u5b58\u5728\u3002<\/p>\n
\u81f3\u4e8esigqueue\u589e\u52a0\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\uff0c\u5176\u5b9a\u4e49\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
union sigval {\r\n\tint sival_int;\r\n\tvoid __user *sival_ptr;};\r\n<\/pre>\n
\u4f20\u7edf\u7684\u4fe1\u53f7\u662f\u6ca1\u6709\u4f20\u9012\u6d88\u606f\u7684\u529f\u80fd\u7684\uff0csigval<\/strong>\u7b97\u662f\u7a0d\u5fae\u6269\u5c55\u4e86\u4e00\u4e0b\u4fe1\u53f7\u7684\u901a\u4fe1\u80fd\u529b\u3002\u6bd4\u5982\uff0c\u901a\u4fe1\u53cc\u65b9\u53ef\u4ee5\u4e8b\u5148\u7ea6\u5b9a\u67d0\u4e9b\u4e8b\u4ef6\u4e3a\u7279\u5b9a\u7684int\u503c\uff0c\u8fd9\u4e2a”sival_int”\u5c31\u53ef\u4ee5\u7528\u6765\u4fdd\u5b58\u5177\u4f53\u7684int\u503c\uff0c\u76ee\u6807\u8fdb\u7a0b\u53ef\u4ee5\u636e\u6b64\u6765\u533a\u5206\u4e0d\u540c\u7684\u4e8b\u4ef6\uff0c\u505a\u51fa\u4e0d\u540c\u7684\u54cd\u5e94\u3002\u5f53\u7136\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4f20\u9012\u7684\u6d88\u606f\u5185\u5bb9\u53d7\u9650\uff0c\u4e14\u4e0d\u6613\u6269\u5c55\uff0c\u56e0\u800c\u4e0d\u9002\u5408\u7528\u4f5c\u5e38\u89c4\u7684\u901a\u4fe1\u624b\u6bb5\u3002<\/p>\n
\u4fe1\u53f7\u7684\u5185\u6838\u5904\u7406<\/h3>\n
\u5c31\u7b97\u662f\u8fdb\u7a0b\u4e4b\u95f4\u53d1\u9001\u4fe1\u53f7\uff0c\u90a3\u4e5f\u662f\u8981\u7ecf\u8fc7\u5185\u6838\u7684\uff0c\u53ef\u4ee5\u7406\u89e3\u6210\u662f\u88ab\u5185\u6838\u201c\u622a\u83b7\u201d\u4e86\u5427\u3002<\/p>\n
\"linux
\n\"linux  <\/p>\n
\u7531\u4e8e\u5185\u6838\u6001\u548c\u7528\u6237\u6001\u7684\u5207\u6362\u64cd\u4f5c\u5728\u4e0d\u540c\u7684\u786c\u4ef6\u4f53\u7cfb\u67b6\u6784\u4e0a\u662f\u4e0d\u540c\u7684\uff0c\u800c\u4e14\u6709\u4e00\u4e9b\u4fe1\u53f7\uff0c\u6bd4\u5982SIGCHLD\u548cSIGSTOP\uff0c\u5176\u5b9e\u73b0\u4e5f\u662f\u548c\u67b6\u6784\u76f8\u5173\u7684\uff0c\u6240\u4ee5Linux\u4e2dsignal\u673a\u5236\u7684\u5f88\u591a\u4ee3\u7801\u90fd\u662f\u653e\u5728\u67b6\u6784\u76f8\u5173\u7684\u76ee\u5f55\u4e0b\u7684\uff0c\u6bd4\u5982”\/arch\/arm\/kernel\/signal.c”\u3002<\/p>\n
\u4e00\u4e2a\u4fe1\u53f7\u7684\u76f8\u5173\u4fe1\u606f\u5728\u5185\u6838\u4e2d\u7528siginfo_t<\/strong>\u7ed3\u6784\u4f53\u8868\u793a\uff1a<\/p>\n
siginfo_t{\r\n    int si_signo;\r\n    int si_sicode;\r\n    union __sifields _sifields;\r\n    ...}\r\n<\/pre>\n
    \n
  • \n
    si_signo<\/strong>\u662f\u4fe1\u53f7\u7684\u7f16\u53f7\uff0c\u4ece1\u523064\u7684\u503c\u90fd\u662f\u5408\u6cd5\u7684\u3002<\/p>\n<\/li>\n
  • \n
    si_sicode<\/strong>\u8bb0\u5f55\u4e86\u4fe1\u53f7\u7684\u6765\u6e90\uff0c\u6bd4\u5982SI_USER\u8868\u793a\u4fe1\u53f7\u662f\u7531\u8fdb\u7a0b\u8c03\u7528kill()\u53d1\u51fa\u7684\uff0cSI_QUEUE\u662f\u7531\u8fdb\u7a0b\u8c03\u7528sigqueue()\u53d1\u51fa\u7684\uff0cSI_KERNEL\u5219\u8bf4\u660e\u8be5\u4fe1\u53f7\u7531\u5185\u6838\u4ea7\u751f\u7684\u3002<\/p>\n<\/li>\n
  • \n
    _sifields<\/strong>\u5bf9\u4e0d\u540c\u7684\u4fe1\u53f7\u4f1a\u6709\u4e0d\u540c\u7684\u542b\u4e49\uff0c\u901a\u5e38\u5305\u62ec\u4fe1\u53f7\u53d1\u9001\u8fdb\u7a0b\u7684si_pid\uff0c\u53d1\u9001\u8fdb\u7a0b\u6240\u5c5euser\u7684si_uid\u7b49\u3002\u5bf9\u4e8e\u7531sigqueue()\u53d1\u9001\u7684\u4fe1\u53f7\uff0c\u8fd8\u5305\u62ec”sigval “\u53c2\u6570\u6240\u643a\u5e26\u7684\u9644\u52a0\u4fe1\u606f\u3002<\/p>\n<\/li>\n<\/ul>\n
    \u5185\u6838\u5728\u622a\u83b7\u5230\u4e00\u4e2a\u8fdb\u7a0b\u53d1\u9001\u7684\u4fe1\u53f7\u540e\uff0c\u4f1a\u9996\u5148\u505a\u4e00\u7cfb\u5217\u7684\u68c0\u67e5\uff0c\u6bd4\u5982\u8be5\u4fe1\u53f7\u7684\u503c\u662f\u5426\u5408\u6cd5\u5566\uff0c\u8fdb\u7a0b\u6709\u6ca1\u6709\u53d1\u9001\u8fd9\u4e2a\u4fe1\u53f7\u7684\u6743\u9650\u5566\u3002\u5982\u679c\u68c0\u67e5\u901a\u8fc7\uff0c\u5c31\u8c03\u7528copy_from_user()\u5c06\u8be5\u4fe1\u53f7\u7684\u76f8\u5173\u4fe1\u606f\u590d\u5236\u5230siginfo_t\u7ed3\u6784\u4f53\u4e2d\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662f\u300alinux signal\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8eLinux,signal\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    linux signal\u7684\u4f5c\u7528\u662f\u4ec0\u4e48 \u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60\u6587\u7ae0\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587\u300alinux signal\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\u300b\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0\u6587\u7ae0\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01 linux signal\u7528\u6765\u901a\u77e5\u8fdb\u7a0b\u67d0\u4e2a\u7279\u5b9a\u4e8b\u4ef6\u7684\u53d1\u751f\u6216\u8005\u662f\u8ba9\u8fdb\u7a0b\u6267\u884c\u67d0\u4e2a\u7279\u5b9a\u7684\u5904\u7406\u51fd\u6570\uff1bsignal\u5373\u4fe1\u53f7\uff0c\u662fUnix\u5bb6\u65cf\u4e2d\u4e00\u4e2a\u53e4\u8001\u7684\u901a\u4fe1\u673a\u5236\uff1b\u4fe1\u53f7\u53ef\u4ee5\u6765\u81ea\u7ec8\u7aef\u7684\u952e\u76d8\u5b57\u7b26\u8f93\u5165\uff0c\u6bd4\u5982control-C\u89e6\u53d1\u7684SIGINIT\uff0c\u4e5f\u53ef\u4ee5\u6765\u81ea\u4e0e\u786c\u4ef6\u6216\u8f6f\u4ef6\u6709\u5173\u7684\u5f02\u5e38\uff0c\u6bd4\u5982\u5e94\u7528\u7a0b\u5e8f\u8bbf\u95ee\u4e86\u65e0\u6548\u5730\u5740\u89e6\u53d1\u7684SIGSEGV\uff0c\u5b9a\u65f6\u5668\u5230\u671f\u89e6\u53d1\u7684SIGALARM\u7b49\u3002 linux signal\u7528\u6765\u505a\u4ec0\u4e48\uff1f Linux\u4e2d\u7684\u4fe1\u53f7\u5904\u7406\u673a\u5236 \u4fe1\u53f7(Signal)\u662fUnix\u5bb6\u65cf\u4e2d\u4e00\u4e2a\u53e4\u8001\u7684\u901a\u4fe1\u673a\u5236\uff0c\u4e3b\u8981\u7528\u6765\u901a\u77e5\u8fdb\u7a0b\u67d0\u4e2a\u7279\u5b9a\u4e8b\u4ef6\u7684\u53d1\u751f\uff0c\u6216\u8005\u662f\u8ba9\u8fdb\u7a0b\u6267\u884c\u67d0\u4e2a\u7279\u5b9a\u7684\u5904\u7406\u51fd\u6570\u3002\u8bf4\u5b83\u53e4\u8001\uff0c\u662f\u56e0\u4e3a\u5b83\u5728\u7b2c\u4e00\u4ee3Unix\u7cfb\u7edf\u4e2d\u5c31\u5df2\u7ecf\u5b58\u5728\u4e86\u3002 \u4fe1\u53f7\u7684\u53d1\u9001 \u4fe1\u53f7\u53ef\u4ee5\u6765\u81ea\u7ec8\u7aef(terminal)\u7684\u952e\u76d8\u5b57\u7b26\u8f93\u5165\uff0c\u6bd4\u5982control-C\u89e6\u53d1\u7684SIGINIT\uff1b\u4e5f\u53ef\u4ee5\u6765\u81ea\u4e0e\u786c\u4ef6\u6216\u8f6f\u4ef6\u6709\u5173\u7684\u5f02\u5e38\uff0c\u6bd4\u5982\u5e94\u7528\u7a0b\u5e8f\u8bbf\u95ee\u4e86\u65e0\u6548\u5730\u5740\u89e6\u53d1\u7684SIGSEGV(segmentation fault)\uff0c\u5b9a\u65f6\u5668\u5230\u671f\u89e6\u53d1\u7684SIGALARM\u7b49\u3002\u8fd9\u4e9b\u4fe1\u53f7\u90fd\u662f\u7531\u5185\u6838\u53d1\u9001\u7ed9\u8fdb\u7a0b\u7684\u3002 \u8fdb\u7a0b\u6536\u5230\u7684\u4fe1\u53f7\u8fd8\u53ef\u4ee5\u6765\u81ea\u4e8e\u5176\u4ed6\u8fdb\u7a0b\u3002\u4f46\u4e0d\u662f\u6240\u6709\u7684\u8fdb\u7a0b\u90fd\u53ef\u4ee5\u5411\u5176\u4ed6\u4efb\u610f\u4e00\u4e2a\u8fdb\u7a0b\u53d1\u9001\u4fe1\u53f7\uff0c\u53ea\u6709\u5177\u6709root\u6743\u9650\u7684super user\u624d\u53ef\u4ee5\u8fd9\u4e48\u505a\uff0c\u5bf9\u4e8e\u666e\u901auser\u7684\u8fdb\u7a0b\uff0c\u53ea\u80fd\u5411\u5c5e\u4e8e\u540c\u4e00user\u7684\u8fdb\u7a0b\u53d1\u9001\u4fe1\u53f7\u3002 \u90a3\u8fdb\u7a0b\u53ef\u4ee5\u5411\u5185\u6838\u53d1\u9001\u4fe1\u53f7\u5417\uff1f\u53ef\u4ee5\u662f\u53ef\u4ee5\uff0c\u4f46\u5185\u6838\u7ebf\u7a0b\u662f\u4e0d\u4f1a\u54cd\u5e94\u7684\uff0c\u53d1\u4e86\u4e5f\u767d\u53d1\uff0c\u9664\u975e\u2026\u2026\u4f60\u4fee\u6539\u5185\u6838\u4ee3\u7801\u3002 \u901a\u5e38\u4fe1\u53f7\u88ab\u8ba4\u4e3a\u662f\u4e00\u79cd\u5f02\u6b65\u7684\u673a\u5236\uff0c\u4f46\u662f\u5728Linux\u7684\u4ee3\u7801\u4e2d\uff0c\u4ee5\u4e0b\u7531\u5f02\u5e38\u5f15\u8d77\u7684\u4fe1\u53f7\u4e5f\u88ab\u79f0\u4e3a”synchronous”\u7684\uff1a #define SYNCHRONOUS_MASK \\ (sigmask(SIGSEGV) | sigmask(SIGBUS) | sigmask(SIGILL) | \\ sigmask(SIGTRAP) | sigmask(SIGFPE) | sigmask(SIGSYS)) \u8fd9\u91cc\u6211\u4eec\u79f0\u63a5\u6536\u4fe1\u53f7\u7684\u8fdb\u7a0b\u4e3a\u201c\u76ee\u6807\u8fdb\u7a0b\u201d\u3002\u4f20\u7edf\u7684\u4fe1\u53f7\u53d1\u9001\u51fd\u6570\u662fkill()\uff0c\u8fd9\u540d\u5b57\u770b\u8d77\u6765\u597d\u5413\u4eba\uff0c\u611f\u89c9\u597d\u50cf\u662f\u76ee\u6807\u8fdb\u7a0b\u9a6c\u4e0a\u5c31\u8981\u88ab\u201c\u6740\u201d\u6389\u4e86\u3002\u4e8b\u5b9e\u4e0a\uff0c\u867d\u7136\u5404\u8def\u4fe1\u53f7\u90fd\u7528kill()\u6765\u53d1\u9001\uff0c\u4f46\u771f\u6b63\u8981”kill”\u6389\u8fdb\u7a0b\u7684\uff0c\u53ea\u5360\u4e00\u5c0f\u90e8\u5206\u3002\u5f53\u7136\uff0c\u73b0\u5728\u5df2\u7ecf\u6709\u4e86\u529f\u80fd\u66f4\u5f3a\uff0c\u540d\u5b57\u4e5f\u66f4\u53cb\u597d\u7684sigqueue()\u4e86\u3002 \u6765\u770b\u4e0b\u4e24\u8005\u7684\u51fd\u6570\u539f\u578b\uff1a int kill(pid_t pid, int sig);int sigqueue(pid_t pid, int sig, const union sigval value); pid\u4ee3\u8868\u76ee\u6807\u8fdb\u7a0b\u7684PID\u3002Linux\u4e2d\u8fdb\u7a0b\u7684PID\u90fd\u662f\u6b63\u6570\uff0c\u90a3\u53c2\u6570pid\u7684\u503c\u5982\u679c\u662f0\u6216\u8005\u8d1f\u6570\uff0c\u662f\u4e0d\u662f\u5c31\u662f\u975e\u6cd5\u7684\u5462\uff1f\u975e\u4e5f\uff0c\u4e8b\u5b9e\u4e0a\uff0c0\u548c\u8d1f\u6570\u5728\u8fd9\u91cc\u90fd\u662f\u6709\u5176\u4ed6\u7528\u9014\u7684\u3002Linux\u91cc\u6709\u4e2a\u8fdb\u7a0b\u7ec4\u7684\u6982\u5ff5(process group)\uff0c\u8868\u793a\u4e00\u7c7b\u8fdb\u7a0b\u7684\u96c6\u5408\u3002\u5728kill()\u4e2d\uff0c\u53c2\u6570pid\u4e3a”0″\u8bf4\u660e\u4fe1\u53f7\u662f\u53d1\u7ed9\u5f53\u524d\u8fdb\u7a0b\u6240\u5728\u8fdb\u7a0b\u7ec4\u7684\u6240\u6709\u8fdb\u7a0b\uff0c\u5c0f\u4e8e”-1″\u5219\u662f\u5411\u7f16\u53f7\u4e3a-pid\u7684\u8fdb\u7a0b\u7ec4\u53d1\u9001\u4fe1\u53f7\u3002 __kill_pgrp_info(sig, info, pid ? find_vpid(-pid) : […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-51974","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/51974","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=51974"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/51974\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=51974"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=51974"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=51974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}