{"id":679,"date":"2017-02-14T14:49:56","date_gmt":"2017-02-14T06:49:56","guid":{"rendered":"http:\/\/www.5x44.cn\/?p=679"},"modified":"2017-02-14T14:49:56","modified_gmt":"2017-02-14T06:49:56","slug":"sigaction%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=679","title":{"rendered":"sigaction\u51fd\u6570"},"content":{"rendered":"

sigaction\u51fd\u6570\u5141\u8bb8\u6211\u4eec\u68c0\u67e5\u6216\u4fee\u6539\uff08\u6216\u4e24\u8005\uff09\u7279\u5b9a\u4fe1\u53f7\u7684\u52a8\u4f5c\u3002\u8fd9\u4e2a\u51fd\u6570\u5728\u65e9\u671f\u7684UNIX\u7248\u672c\u4e2d\u4ee3\u66ff\u4e86signal<\/span>\u51fd\u6570\u3002\u5728\u672c\u8282\u7684\u6700\u540e\uff0c\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4f7f\u7528sigaction<\/span>\u7684signal<\/span>\u5b9e\u73b0\u3002<\/p>\n\n\n\n
\n\n\n\n\n
\n
#include <signal.h>\r\n\r\nint sigaction(int signo<\/span>, const struct sigaction *restrict act<\/span>,<\/span>\r\n              struct sigaction *restrict oact<\/span>);\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n
\n

Returns: 0 if OK, 1 on error<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

signo<\/em>\u53c2\u6570\u662f\u6211\u4eec\u8981\u68c0\u67e5\u6216\u8981\u4fee\u6539\u7684\u4fe1\u53f7\u6570\u3002\u5982\u679cact<\/em>\u6307\u9488\u662f\u4e00\u4e2a\u975e\u7a7a\u6307\u9488\uff0c\u90a3\u4e48\u4f1a\u4fee\u6539\u8fd9\u4e2a\u6307\u9488\u3002\u5982\u679coact<\/em>\u6307\u9488\u662f\u4e00\u4e2a\u975e\u7a7a\u6307\u9488\uff0c\u7cfb\u7edf\u901a\u8fc7oact<\/em>\u6307\u9488\u8fd4\u56de\u4e4b\u524d\u8be5\u4fe1\u53f7\u7684\u52a8\u4f5c\u3002\u8fd9\u4e2a\u51fd\u6570\u4f7f\u7528\u4e0b\u9762\u7684\u7ed3\u6784\uff1a<\/p>\n\n\n\n
\n
     struct sigaction {\r\n       void      (*sa_handler)(int);   \/* addr of signal handler, *\/\r\n                                       \/* or SIG_IGN, or SIG_DFL *\/\r\n       sigset_t sa_mask;               \/* additional signals to block *\/\r\n       int      sa_flags;              \/* signal options, Figure 10.16 *\/\r\n\r\n       \/* alternate handler *\/\r\n       void     (*sa_sigaction)(int, siginfo_t *, void *);\r\n    };\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u5f53\u4e3a\u4fe1\u53f7\u6539\u53d8\u52a8\u4f5c\u65f6\uff0c\u5982\u679csa_handler\u5b57<\/span><\/span>\u6bb5\u5305\u542b\u4e86\u4fe1\u53f7\u5904\u7406\u51fd\u6570\uff08signal-catching function\uff09\u7684\u5730\u5740\uff08\u4e0d\u5305\u542bSIG_IGN<\/span>\u6216SIG_DFL<\/span>\uff09\uff0c\u90a3\u4e48\u5728\u4fe1\u53f7\u5904\u7406\u51fd\u6570\uff08signal-catching function\uff09\u88ab\u8c03\u7528\u524dsa_mask<\/span>\u5b57\u6bb5\u4e3a\u8fdb\u7a0b\u6307\u5b9a\u4e86\u4e00\u5957\u4fe1\u53f7\u63a9\u7801\u3002\u5f53\u4e14\u4ec5\u5f53\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u8fd4\u56de\u65f6\uff0c\u8fdb\u7a0b\u7684\u4fe1\u53f7\u63a9\u7801\u91cd\u7f6e\u6210\u5b83\u4e4b\u524d\u7684\u503c\u3002\u8fd9\u79cd\u65b9\u6cd5\uff0c\u6211\u4eec\u80fd\u963b\u585e\u67d0\u79cd\u4fe1\u53f7\u65e0\u8bba\u4fe1\u53f7\u5904\u7406\u51fd\u6570\uff08signal handler\uff09\u4f55\u65f6\u88ab\u8c03\u7528\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u4fdd\u8bc1\u65e0\u8bba\u4f55\u65f6\u8fdb\u7a0b\u6536\u5230\u4fe1\u53f7\u65f6\uff0c\u5176\u5b83\u76f8\u540c\u4fe1\u53f7\u90fd\u88ab\u963b\u585e\uff0c\u76f4\u5230\u6211\u4eec\u5b8c\u6210\u8fdb\u7a0b\u7b2c\u4e00\u4e2a\u6536\u5230\u7684\u4fe1\u53f7\u3002\u56de\u5fc6APUE10.8\u8282\uff0c\u989d\u5916\u53d1\u751f\u7684\u76f8\u540c\u4fe1\u53f7\u901a\u5e38\u4e0d\u4f1a\u6392\u961f\u3002\u5f53\u6211\u4eec\u672a\u89e3\u9501\u4fe1\u53f7\u65f6\u5982\u679c\u4fe1\u53f7\u53d1\u751f5\u6b21\u90fd\u88ab\u963b\u585e\uff0c\u4e3a\u8be5\u4fe1\u53f7\u8bbe\u7f6e\u7684\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u4ec5\u5c06\u4f1a\u88ab\u8c03\u7528\u4e00\u6b21\u3002<\/p>\n
\u4e00\u65e6\u6211\u4eec\u4e3a\u67d0\u4e00\u4fe1\u53f7\u201c\u5b89\u88c5\u201d\u4e86\u52a8\u4f5c\uff0c \u76f4\u5230\u6211\u4eec\u660e\u663e\u7684\u901a\u8fc7sigaction\u6539\u53d8\u5b83\uff0c\u5b83\u90fd\u4f1a\u4e00\u76f4\u4fdd\u7559\u8fd9\u4e2a\u52a8\u4f5c\u3002<\/p>\n
\u53c2\u6570act<\/em>\u7ed3\u6784\u7684sa_flags<\/span>\u5b57\u6bb5\u4e3a\u5904\u7406\u4fe1\u53f7\u6307\u5b9a\u4e86\u591a\u79cd\u9009\u9879\u3002FIGURE10.16\u6709\u8fd9\u4e9b\u9009\u9879\u7684\u8be6\u7ec6\u4fe1\u606f\u3002SUS\u5217\u4e2d\u5305\u542b\u2022\u8868\u793a\u8fd9\u4e2a\u6807\u8bb0\u662f\u505a\u4e3a\u57fa\u4e8ePOSIX.1\u4e00\u90e8\u5206\u5b9a\u4e49\u7684\u3002\u5305\u542bXSI\u8868\u793a\u662f\u57fa\u4e8eXSI\u7684\u3002<\/p>\n\n\n\n
\n\n\n\n\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n\n\n\n
\n
Figure 10.16. Option flags (sa_flags<\/tt><\/span>) for the handling of each signal<\/strong><\/h5>\n<\/caption>\n
\n
Option<\/span><\/p>\n<\/th>\n
\n
SUS<\/span><\/p>\n<\/th>\n
\n
FreeBSD 5.2.1<\/span><\/p>\n<\/th>\n
\n
Linux 2.4.22<\/span><\/p>\n<\/th>\n
\n
Mac OS X 10.3<\/span><\/p>\n<\/th>\n
\n
Solaris 9<\/span><\/p>\n<\/th>\n
\n
Description<\/span><\/p>\n<\/th>\n<\/tr>\n<\/thead>\n
\n
SA_INTERRUPT<\/tt><\/span><\/p>\n<\/td>\n
<\/td>\n<\/td>\n\n
\u2022<\/p>\n<\/td>\n
<\/td>\n<\/td>\n\n
\u7cfb\u7edf\u88ab\u8be5\u4fe1\u53f7\u4e2d\u65ad\u540e\u4e0d\u4f1a\u81ea\u52a8\u91cd\u542f\uff08the XSI default for sigaction<\/span>\uff09\u8be6\u60c5\u89c1APUE10.5\u8282<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
SA_NOCLDSTOP<\/tt><\/span><\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u5982\u679csigno<\/em>\u662fSIGCHLD\uff0c\u5f53\u5b50\u8fdb\u7a0b\u505c\u6b62\uff08\u4efb\u52a1\u63a7\u5236\uff09\u65f6\u4e0d\u4ea7\u751f\u8be5\u4fe1\u53f7\u3002\u5f53\u7136\uff0c\u5f53\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u7ec8\u6b62\u65f6\u8fd9\u4e2a\u4fe1\u53f7\u4ecd\u7136\u4f1a\u4ea7\u751f\uff08\u4f46\u662f\u8981\u770b\u4e0b\u9762\u7684SA_NOCLDWAIT<\/span>\u9009\u9879\u60c5\u51b5\uff09\u3002\u505a\u4e3aXSI\u6269\u5c55\uff0c\u5f53\u4e00\u4e2a\u8bbe\u7f6e\u4e86\u8be5\u9009\u9879\u7684\u5b50\u8fdb\u7a0b\u505c\u6b62\u540e\u53c8\u7ee7\u7eed\u8fd0\u884c\u65f6SIGCHLD<\/span>\u5c06\u4e0d\u4f1a\u88ab\u53d1\u9001\u3002<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n
\n
SA_NOCLDWAIT<\/tt><\/span><\/p>\n<\/td>\n
\n
XSI<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u5982\u679csigno<\/em>\u662fSIGCHLD<\/span>\uff0c\u8fd9\u4e2a\u9009\u9879\u53ef\u4ee5\u9632\u6b62\u5f53\u8c03\u7528\u8fdb\u7a0b\u7684\u5b50\u8fdb\u7a0b\u7ec8\u6b62\u540e\u7cfb\u7edf\u5efa\u7acb\u50f5\u5c38\u8fdb\u7a0b\u3002\u5982\u679c\u5b83\u968f\u540e\u8c03\u7528wait\uff0c\u90a3\u4e48\u8fd9\u4e2a\u8c03\u7528\u8fdb\u7a0b\u4f1a\u88ab\u963b\u585e\u76f4\u5230\u5b83\u7684\u6240\u6709\u5b50\u8fdb\u7a0b\u90fd\u5df2\u7ecf\u7ec8\u6b62\u5e76\u8fd4\u56de1\u800c\u4e14errno<\/span>\u8bbe\u7f6e\u6210ECHILD<\/span>\u3002 (Recall Section 10.7<\/a>.)<\/p>\n<\/td>\n<\/tr>\n
\n
SA_NODEFER<\/tt><\/span><\/p>\n<\/td>\n
\n
XSI<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u5f53\u8fd9\u4e2a\u4fe1\u53f7\u88ab\u6355\u83b7\u540e\uff0c\u5f53\u4fe1\u53f7\u5904\u7406\u7a0b\u5e8f\u6267\u884c\u65f6\u4fe1\u53f7\u4e0d\u4f1a\u88ab\u7cfb\u7edf\u963b\u585e\uff08\u9664\u975e\u4fe1\u53f7\u88ab\u5305\u542b\u5728sa_mask<\/span>\u4e2d\uff09\u3002\u6ce8\u610f\u8fd9\u7c7b\u64cd\u4f5c\u9002\u7528\u4e8e\u65e9\u671f\u4e0d\u53ef\u9760\u7684\u4fe1\u53f7\u3002<\/p>\n<\/td>\n<\/tr>\n
\n
SA_ONSTACK<\/tt><\/span><\/p>\n<\/td>\n
\n
XSI<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u5982\u679c\u5907\u7528\u6808(alternate stack)\u5df2\u88absigaltstack<\/span>(2)\u58f0\u660e\u8fc7\uff0c\u8fd9\u4e2a\u4fe1\u53f7\u88ab\u4f20\u9001\u5230\u8fdb\u7a0b\u7684\u5907\u7528\u6808\u4e0a\u3002<\/p>\n<\/td>\n<\/tr>\n
\n
SA_RESETHAND<\/tt><\/span><\/p>\n<\/td>\n
\n
XSI<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\u8be5\u6807\u8bb0\u662f\u7528\u4e8e\u4fe1\u53f7\u91cd\u7f6eSIG_DFL<\/span>\uff0c\u5e76\u4e14\u6e05\u9664\u4f20\u9001\u5230\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u7684SA_SIGINFO<\/span>\u6807\u8bb0\u3002\u6ce8\u610f\uff0c\u8fd9\u4e2a\u64cd\u4f5c\u9002\u7528\u4e8e\u65e9\u671f\u4e0d\u53ef\u9760\u7684\u4fe1\u53f7\u3002\u65e0\u8bba\u5982\u4f55\uff0c\u8fd9\u4e2a\u6807\u8bb0\u5bf9\u4e8eSIGILL<\/span>\u548cSIGTRAP<\/span>\u4fe1\u53f7\u4e0d\u80fd\u81ea\u52a8\u91cd\u542f\u3002\u8bbe\u7f6e\u8fd9\u4e2a\u6807\u8bb0\u4f1a\u5bfc\u81f4sigaction<\/span>\u7684\u884c\u4e3a\u5c31\u50cf\u540c\u65f6\u8bbe\u7f6e\u4e86SA_NODEFER<\/span>\u4e00\u6837\u3002<\/td>\n<\/tr>\n
\n
SA_RESTART<\/span><\/tt><\/p>\n<\/td>\n
\n
XSI<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\u5f53\u7cfb\u7edf\u8c03\u7528\u88ab\u4e2d\u65ad\u540e\uff0c\u8be5\u6807\u8bb0\u4f1a\u4ee4\u7cfb\u7edf\u8c03\u7528\u81ea\u52a8\u91cd\u542f\u3002\uff08\u8be6\u60c5APUE 10.5\u8282\uff09<\/td>\n<\/tr>\n
\n
SA_SIGINFO<\/tt><\/span><\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u2022<\/p>\n<\/td>\n
\n
\u8fd9\u4e2a\u9009\u9879\u63d0\u4f9b\u4e86\u989d\u5916\u7684\u4fe1\u606f\u7ed9\u4fe1\u53f7\u5904\u7406\u51fd\u6570\uff1a\u4e00\u4e2a\u6307\u5411siginfo<\/span>\u7ed3\u6784\u7684\u6307\u9488\uff0c\u5e76\u4e14\u4e00\u4e2a\u6307\u9488\u6307\u5411\u8fdb\u7a0b\u6587\u672c\u533a\u7684\u6807\u793a\u7b26\u3002<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u5f53SA_SIGINFO<\/span>\u6807\u8bb0\u88ab\u7528\u4e8esigaction<\/span>\u65f6\uff0csa_sigaction<\/span>\u5b57\u6bb5\u662f\u4e00\u4e2a\u53ef\u9009\u7684\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u3002\u5177\u4f53\u5b9e\u73b0\u53ef\u80fd\u4f1a\u4f7f\u7528\u76f8\u540c\u7684\u5b58\u50a8\u7a7a\u95f4\u5b58\u653esa_sigaction<\/span>\u5b57\u6bb5\u548csa_handler<\/span>\u5b57\u6bb5\uff0c\u6240\u4ee5\u5e94\u7528\u7a0b\u5e8f\u5728\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u4f7f\u7528\u5176\u4e2d\u7684\u4e00\u4e2a\u3002<\/p>\n
\u4e00\u822c\u6765\u8bf4\uff0c\u4fe1\u53f7\u5904\u7406\u51fd\u6570\uff08signal handler\uff09\u8c03\u7528\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n
void handler(int signo<\/span>);\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u4f46\u662f\u5982\u679cSA_SIGINFO<\/span>\u6807\u8bb0\u88ab\u8bbe\u7f6e\uff0c\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u8c03\u7528\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n
void handler(int signo<\/span>, siginfo_t *info<\/span>, void *context<\/span>);<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
siginfo_t\u7ed3\u6784\u5305\u542b\u4e86\u5173\u4e8e\u4e3a\u4ec0\u4e48\u4fe1\u53f7\u88ab\u4ea7\u751f\u7684\u4fe1\u606f\u3002\u4e0b\u9762\u6709\u4e00\u4e2a\u90fd\u80fd\u663e\u793a\u4ec0\u4e48\u5185\u5bb9\u7684\u4f8b\u5b50\u3002\u6240\u6709POSIX.1\u517c\u5bb9\u5b9e\u73b0\u5fc5\u987b\u81f3\u5c11\u5305\u542bsi_signo<\/span>\u548csi_code<\/span>\u6210\u5458\u3002\u53e6\u5916\uff0cXSI\u517c\u5bb9\u7684\u5177\u4f53\u5b9e\u73b0\u81f3\u5c11\u5305\u542b\u5982\u4e0b\u5b57\u6bb5\uff1a<\/p>\n\n\n\n
\n
struct siginfo {\r\n      int    si_signo;  \/* signal number *\/\r\n      int    si_errno;  \/* if nonzero, errno value from <errno.h> *\/\r\n      int    si_code;   \/* additional info (depends on signal) *\/\r\n      pid_t  si_pid;    \/* sending process ID *\/\r\n      uid_t  si_uid;    \/* sending process real user ID *\/\r\n      void  *si_addr;   \/* address that caused the fault *\/\r\n      int    si_status; \/* exit value or signal number *\/\r\n      long   si_band;   \/* band number for SIGPOLL *\/\r\n      \/* possibly other fields also *\/\r\n    };\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
FIGURE 10.17\u663e\u793a\u4e86si_code<\/span>\u5bf9\u4e8e\u5404\u79cd\u4fe1\u53f7\u7684\u503c\uff0c\u505a\u4e3aSingle UNIX Specification\u3002\u6ce8\u610f\uff1a\u5177\u4f53\u5b9e\u73b0\u53ef\u80fd\u5b9a\u4e49\u4e86\u989d\u5916\u7684\u503c\u3002<\/p>\n\n\n\n
\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n
Figure 10.17. siginfo_t<\/tt> code values<\/h5>\n<\/caption>\n
\n
Signal<\/span><\/p>\n<\/th>\n
\n
Code<\/span><\/p>\n<\/th>\n
\n
Reason<\/span><\/p>\n<\/th>\n<\/tr>\n<\/thead>\n
<\/td>\n\n
ILL_ILLOPC<\/tt><\/p>\n<\/td>\n
\n
illegal opcode<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
ILL_ILLOPN<\/tt><\/p>\n<\/td>\n
\n
illegal operand<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
ILL_ILLADR<\/tt><\/p>\n<\/td>\n
\n
illegal addressing mode<\/p>\n<\/td>\n<\/tr>\n
\n
SIGILL<\/tt><\/p>\n<\/td>\n
\n
ILL_ILLTRP<\/tt><\/p>\n<\/td>\n
\n
illegal trap<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
ILL_PRVOPC<\/tt><\/p>\n<\/td>\n
\n
privileged opcode<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
ILL_PRVREG<\/tt><\/p>\n<\/td>\n
\n
privileged register<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
ILL_COPROC<\/tt><\/p>\n<\/td>\n
\n
coprocessor error<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
ILL_BADSTK<\/tt><\/p>\n<\/td>\n
\n
internal stack error<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
FPE_INTDIV<\/tt><\/p>\n<\/td>\n
\n
integer divide by zero<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
FPE_INTOVF<\/tt><\/p>\n<\/td>\n
\n
integer overflow<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
FPE_FLTDIV<\/tt><\/p>\n<\/td>\n
\n
floating-point divide by zero<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
FPE_FLTOVF<\/tt><\/p>\n<\/td>\n
\n
floating-point overflow<\/p>\n<\/td>\n<\/tr>\n
\n
SIGFPE<\/tt><\/p>\n<\/td>\n
\n
FPE_FLTUND<\/tt><\/p>\n<\/td>\n
\n
floating-point underflow<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
FPE_FLTRES<\/tt><\/p>\n<\/td>\n
\n
floating-point inexact result<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
FPE_FLTINV<\/tt><\/p>\n<\/td>\n
\n
invalid floating-point operation<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
FPE_FLTSUB<\/tt><\/p>\n<\/td>\n
\n
subscript out of range<\/p>\n<\/td>\n<\/tr>\n
\n
SIGSEGV<\/tt><\/p>\n<\/td>\n
\n
SEGV_MAPERR<\/tt><\/p>\n<\/td>\n
\n
address not mapped to object<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
SEGV_ACCERR<\/tt><\/p>\n<\/td>\n
\n
invalid permissions for mapped object<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
BUS_ADRALN<\/tt><\/p>\n<\/td>\n
\n
invalid address alignment<\/p>\n<\/td>\n<\/tr>\n
\n
SIGBUS<\/tt><\/p>\n<\/td>\n
\n
BUS_ADRERR<\/tt><\/p>\n<\/td>\n
\n
nonexistent physical address<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
BUS_OBJERR<\/tt><\/p>\n<\/td>\n
\n
object-specific hardware error<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
trAP_BRKPT<\/tt><\/p>\n<\/td>\n
\n
process breakpoint trap<\/p>\n<\/td>\n<\/tr>\n
\n
SIGTRAP<\/tt><\/p>\n<\/td>\n
\n
TRAP_TRACE<\/tt><\/p>\n<\/td>\n
\n
process trace trap<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
CLD_EXITED<\/tt><\/p>\n<\/td>\n
\n
child has exited<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
CLD_KILLED<\/tt><\/p>\n<\/td>\n
\n
child has terminated abnormally (no core)<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
CLD_DUMPED<\/tt><\/p>\n<\/td>\n
\n
child has terminated abnormally with core<\/p>\n<\/td>\n<\/tr>\n
\n
SIGCHLD<\/tt><\/p>\n<\/td>\n
\n
CLD_TRAPPED<\/tt><\/p>\n<\/td>\n
\n
traced child has trapped<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
CLD_STOPPED<\/tt><\/p>\n<\/td>\n
\n
child has stopped<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
CLD_CONTINUED<\/tt><\/p>\n<\/td>\n
\n
stopped child has continued<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
POLL_IN<\/tt><\/p>\n<\/td>\n
\n
data can be read<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
POLL_OUT<\/tt><\/p>\n<\/td>\n
\n
data can be written<\/p>\n<\/td>\n<\/tr>\n
\n
SIGPOLL<\/tt><\/p>\n<\/td>\n
\n
POLL_MSG<\/tt><\/p>\n<\/td>\n
\n
input message available<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
POLL_ERR<\/tt><\/p>\n<\/td>\n
\n
I\/O error<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
POLL_PRI<\/tt><\/p>\n<\/td>\n
\n
high-priority message available<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
POLL_HUP<\/tt><\/p>\n<\/td>\n
\n
device disconnected<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
SI_USER<\/tt><\/p>\n<\/td>\n
\n
signal sent by kill<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
SI_QUEUE<\/tt><\/p>\n<\/td>\n
\n
signal sent by sigqueue<\/tt> (real-time extension)<\/p>\n<\/td>\n<\/tr>\n
\n
Any<\/tt><\/p>\n<\/td>\n
\n
SI_TIMER<\/tt><\/p>\n<\/td>\n
\n
expiration of a timer set by timer_settime<\/tt> (real-time extension)<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
SI_ASYNCIO<\/tt><\/p>\n<\/td>\n
\n
completion of asynchronous I\/O request (real-time extension)<\/p>\n<\/td>\n<\/tr>\n
<\/td>\n\n
SI_MESGQ<\/tt><\/p>\n<\/td>\n
\n
arrival of a message on a message queue (real-time extension)<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u5982\u679c\u4fe1\u53f7\u662fSIGCHLD<\/span>\uff0c\u90a3\u4e48si_pid<\/span>\uff0csi_status<\/span>\uff0csi_uid<\/span>\u5b57\u6bb5\u5c06\u88ab\u8bbe\u7f6e\u3002\u5982\u679c\u4fe1\u53f7\u662fSIGILL<\/span>\u6216SIGSEGV<\/span>\uff0c\u90a3\u4e48si_addr<\/span>\u542b\u6709\u5931\u8d25\u5730\u5740\u7684\u8d23\u4efb\uff0c\u867d\u7136\u5730\u5740\u53ef\u80fd\u4e0d\u662f\u975e\u5e38\u7684\u7cbe\u51c6\u3002\u5982\u679c\u4fe1\u53f7\u662fSIGPOLL<\/span>\uff0c\u90a3\u4e48si_band<\/span>\u5b57\u6bb5\u5c06\u5305\u542bSTREAMS\u4fe1\u606f\u7684\u4f18\u5148\u7ea7\u6ce2\u6bb5\uff08priority band\uff09\uff0c\u8be5\u4fe1\u606f\u4ea7\u751fPOLL_IN<\/span>\uff0cPOLL_OUT<\/span>\u6216POLL_MSG<\/span>\u4e8b\u4ef6\u3002si_errno<\/span>\u5b57\u6bb5\u5305\u542b\u4e86\u5f15\u53d1\u4fe1\u53f7\u6761\u4ef6\u7684\u9519\u8bef\u53f7\uff0c\u867d\u7136\u9519\u8bef\u53f7\u662f\u7531\u5177\u4f53\u5b9e\u73b0\u5b9a\u4e49\u7684\u3002<\/p>\n
\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u7684context<\/em>\u53c2\u6570\u662f\u65e0\u7c7b\u578b\u6307\u9488\uff0c\u5b83\u80fd\u88ab\u5f3a\u5236\u8f6c\u6362\u6210ucontext_t<\/span>\u7ed3\u6784\uff0c\u7528\u4e8e\u5728\u4fe1\u53f7\u4f20\u9001\u65f6\u8bc6\u522b\u8fdb\u7a0b\u5185\u5bb9\u3002<\/p>\n
\u5f53\u4e00\u4e2a\u7cfb\u7edf\u652f\u6301\u5b9e\u65f6\u4fe1\u53f7\u6269\u5c55\u65f6\uff0c\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u4f7f\u7528SA_SIGINFO<\/span>\u6807\u8bb0\u5efa\u7acb\u5c06\u4f1a\u8ba9\u4fe1\u53f7\u53ef\u9760\u7684\u6392\u961f\u3002\u4e00\u4e2a\u5355\u72ec\u4fdd\u7559\u7684\u4fe1\u53f7\u8303\u56f4\u5e73\u5747\u7528\u4e8e\u5b9e\u65f6\u5e94\u7528\u7a0b\u5e8f\u3002\u5982\u679c\u4fe1\u53f7\u662f\u88absigqueue<\/span>\u4ea7\u751f\u7684\uff0csiginfo<\/span>\u7ed3\u6784\u80fd\u5305\u542b\u5e94\u7528\u7a0b\u5e8f\u6307\u5b9a\u6570\u636e\u3002\u672c\u4e66\u5e76\u4e0d\u8ba8\u8bba\u5b9e\u65f6\u6269\u5c55\u529f\u80fd\u3002<\/p>\n
signal\u51fd\u6570\u4f8b\u5b50<\/h2>\n
\u73b0\u5728\u8ba9\u6211\u4eec\u4f7f\u7528sigaction<\/span>\u5b9e\u73b0signal<\/span>\u51fd\u6570\u529f\u80fd\u3002\u5f88\u591a\u5e73\u53f0\u90fd\u662f\u8fd9\u4e48\u505a\u7684\u3002\u7cfb\u7edf\u4f7f\u7528\u4e8c\u8fdb\u5236\u517c\u5bb9\u7ea6\u675f\uff0c\u6362\u8a00\u4e4b\uff0c\u53ef\u4ee5\u8ba9signal<\/span>\u51fd\u6570\u652f\u6301\u66f4\u8001\u7684\u3001\u4e0d\u53ef\u9760\u7684\u8bed\u4e49\u3002\u9664\u975e\u4f60\u6307\u5b9a\u8981\u6c42\u66f4\u8001\u7684\u3001\u4e0d\u53ef\u9760\u7684\u8bed\u4e49\uff0c\u4e0d\u7136\u4f60\u5e94\u8be5\u76f4\u63a5\u4f7f\u7528\u5f53\u524d\u5b9e\u73b0\u7684signal<\/span>\u6216sigaction<\/span>\u3002\uff08\u56e0\u4e3a\u4f60\u53ef\u80fd\u731c\u5230\u4e86\uff0c\u4e00\u4e2a\u4f7f\u7528\u8001\u8bed\u4e49\u7684signal\u5b9e\u73b0\uff0c\u53ef\u4ee5\u8c03\u7528sigaction<\/span>\u51fd\u6570\u6307\u5b9aSA_RESETHAND<\/span>\u548cSA_NODEFER<\/span>\u9009\u9879\u5b9e\u73b0\u3002\uff09\u672c\u6587\u4e2d\u6240\u8bf4\u7684signal<\/span>\u90fd\u5728figure10.18\u4e2d\u5b9e\u73b0\u3002<\/p>\n
\u6ce8\u610f\uff0c\u6211\u4eec\u5fc5\u987b\u4f7f\u7528sigemptyset<\/span>\u53bb\u521d\u59cb\u5316sa_mask<\/span>\u7ed3\u6784\u7684\u6210\u5458\u3002\u4f7f\u7528act.sa_mask=0<\/span>\u4e0d\u80fd\u4fdd\u8bc1\u548c\u4f7f\u7528sigemptyset<\/span>\u5177\u6709\u76f8\u540c\u6548\u679c\u3002<\/p>\n
\u6211\u4eec\u6709\u610f\u7684\u5c1d\u8bd5\u5bf9\u9664\u4e86SIGALRM<\/span>\u4fe1\u53f7\u5916\u7684\u6240\u6709\u4fe1\u53f7\u4f7f\u7528SA_RESTART<\/span>\u6807\u8bb0\uff0c\u6240\u4ee5\u4efb\u4f55\u7cfb\u7edf\u8c03\u7528\u88ab\u4e2d\u65ad\u540e\u90fd\u4f1a\u81ea\u52a8\u91cd\u65b0\u542f\u52a8\u3002\u4e0d\u5bf9SIGALRM<\/span>\u4fe1\u53f7\u4f7f\u7528SA_RESTART<\/span>\u6807\u8bb0\u7684\u539f\u56e0\u662f\u6211\u4eec\u8981\u4e3aI\/O\u64cd\u4f5c\u8bbe\u7f6e\u8d85\u65f6\u3002<\/p>\n
\u4e00\u4e9b\u8001\u7cfb\u7edf\uff0c\u5c31\u50cfSunOS\uff0c\u5b9a\u4e49\u4e86SA_INTERRUPT<\/span>\u6807\u8bb0\u3002\u8fd9\u4e9b\u7cfb\u7edf\u9ed8\u8ba4\u4f1a\u91cd\u65b0\u542f\u52a8\u88ab\u4e2d\u65ad\u7684\u7cfb\u7edf\u8c03\u7528\uff0c\u6240\u4ee5\u6307\u5b9a\u8fd9\u4e2a\u6807\u8bb0\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u8c03\u7528\u88ab\u4e2d\u65ad\uff08\u6211\u4f30\u8ba1\u5e94\u8be5\u662f\u4e0d\u80fd\u91cd\u65b0\u542f\u52a8\u4e86\uff09\u3002Linux\u4e5f\u5b9a\u4e49\u4e86\u8fd9\u4e2a\u6807\u8bb0\uff0c\u4e3a\u4e86\u517c\u5bb9\u4f7f\u7528\u8be5\u6807\u8bb0\u7684\u7a0b\u5e8f\uff0c\u4f46\u662f\u5f53\u4f7f\u7528sigaction<\/span>\u5b89\u88c5\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u65f6\uff0c\u9ed8\u8ba4\u662f\u4e0d\u91cd\u542f\u7cfb\u7edf\u8c03\u7528\u3002Single UNIX Specification\u7684XSI\u6269\u5c55\u6307\u5b9a\u4e86sigaction<\/span>\u51fd\u6570\u4e0d\u91cd\u542f\u88ab\u4e2d\u65ad\u7684\u7cfb\u7edf\u8c03\u7528\uff0c\u9664\u975eSA_RESTART<\/span>\u6807\u8bb0\u88ab\u6307\u5b9a\u3002<\/p>\n\n\n\n
\n
Figure 10.18. An implementation of signal<\/tt><\/span> using sigaction<\/tt><\/span><\/h3>\n
#include \"apue.h\"\r\n\r\n\/* Reliable version of signal(), using POSIX sigaction(). *\/\r\nSigfunc *\r\nsignal(int signo, Sigfunc *func)\r\n{\r\n    struct sigaction    act, oact;\r\n\r\n    act.sa_handler = func;\r\n    sigemptyset(&act.sa_mask);\r\n    act.sa_flags = 0;\r\n    if (signo == SIGALRM) {\r\n#ifdef SA_INTERRUPT\r\n       act.sa_flags |= SA_INTERRUPT;\r\n#endif\r\n    } else {\r\n#ifdef  SA_RESTART\r\n        act.sa_flags |= SA_RESTART;\r\n#endif\r\n    }\r\n    if (sigaction(signo, &act, &oact) < 0)\r\n        return(SIG_ERR);\r\n    return(oact.sa_handler);\r\n}\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
signal_intr<\/span>\u51fd\u6570\u4f8b\u5b50<\/h2>\n
Figure 10.19\u663e\u793a\u4e86\u4e00\u4e2asignal\u51fd\u6570\u7684\u7248\u672c\uff0c\u5b83\u8bd5\u56fe\u9632\u6b62\u4efb\u4f55\u7cfb\u7edf\u8c03\u7528\u4e2d\u65ad\u540e\u91cd\u542f\u3002<\/p>\n
\u4e3a\u4e86\u6539\u5584\u79fb\u690d\u6027\uff0c\u6211\u4eec\u6307\u5b9a\u4e86SA_INTERRUPT<\/span>\u6807\u8bb0\uff0c\u5982\u679c\u7531\u7cfb\u7edf\u5b9a\u4e49\u4e86\uff0c\u53bb\u9632\u6b62\u88ab\u4e2d\u65ad\u7684\u7cfb\u7edf\u8c03\u7528\u81ea\u52a8\u91cd\u542f\u3002<\/p>\n\n\n\n
\n
Figure 10.19. The signal_intr<\/tt> <\/span>function<\/h3>\n
#include \"apue.h\"\r\n\r\nSigfunc *\r\nsignal_intr(int signo, Sigfunc *func)\r\n{\r\n    struct sigaction    act, oact;\r\n\r\n    act.sa_handler = func;\r\n    sigemptyset(&act.sa_mask);\r\n    act.sa_flags = 0;\r\n#ifdef  SA_INTERRUPT\r\n    act.sa_flags |= SA_INTERRUPT;\r\n#endif\r\n    if (sigaction(signo, &act, &oact) < 0)\r\n        return(SIG_ERR);\r\n    return(oact.sa_handler);\r\n}\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"
sigaction\u51fd\u6570\u5141\u8bb8\u6211\u4eec\u68c0\u67e5\u6216\u4fee\u6539\uff08\u6216\u4e24\u8005\uff09\u7279\u5b9a\u4fe1\u53f7\u7684\u52a8\u4f5c\u3002\u8fd9\u4e2a\u51fd\u6570\u5728\u65e9\u671f\u7684UNIX\u7248\u672c\u4e2d\u4ee3\u66ff\u4e86signal\u51fd\u6570\u3002\u5728\u672c\u8282\u7684\u6700\u540e\uff0c\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4f7f\u7528siga…<\/p>\n
 Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-679","post","type-post","status-publish","format-standard","hentry","category-apue"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=679"}],"version-history":[{"count":10,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/679\/revisions"}],"predecessor-version":[{"id":689,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/679\/revisions\/689"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}