{"id":108188,"date":"2020-05-30T18:10:00","date_gmt":"2020-05-30T10:10:00","guid":{"rendered":"http:\/\/4563.org\/?p=108188"},"modified":"2020-05-30T18:10:00","modified_gmt":"2020-05-30T10:10:00","slug":"%e8%af%9d%e8%af%b4%e8%bf%99%e6%ae%b5%e4%bb%a3%e7%a0%81%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=108188","title":{"rendered":"\u8bdd\u8bf4\u8fd9\u6bb5\u4ee3\u7801\u4ec0\u4e48\u610f\u601d"},"content":{"rendered":"
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\u8bdd\u8bf4\u8fd9\u6bb5\u4ee3\u7801\u4ec0\u4e48\u610f\u601d <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : Vibra <\/span> <\/i> 1<\/span> <\/div>\n
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void(*signal(int, void (*)(int)))(int); <\/code><\/pre>\n
\u91cc\u9762\u7684\u90e8\u5206\u662f\u63a5\u6536\u4e00\u4e2a int \u548c \u4e00\u4e2a\u51fd\u6570\u6307\u9488, \u8fd9\u4e2a\u662f\u6e05\u695a\u7684, \u7b2c\u4e00\u4e2a void \u8ddf\u62ec\u53f7\u662f\u4ec0\u4e48\u610f\u601d…\u4e3a\u4ec0\u4e48\u6700\u540e\u8fd8\u6709\u4e00\u4e2a int \u770b\u4e0d\u61c2\u4e86….<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (10<\/span>)        <\/div>\n
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     \u8cc7\u6df1\u5927\u4f6c : zivyou <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 void (*)(int) \u662f\u4e00\u4e2a\u7c7b\u578b(\u51fd\u6570\u6307\u9488);
    signal(int, void (*)(int)) \u662f\u4e00\u4e2a\u51fd\u6570\u7684\u5b9a\u4e49
    void(*signal(int, void (*)(int)))(int); \u662f\u4e00\u4e2a\u7c7b\u578b\u7ed9\u8fd9\u4e2a\u7c7b\u578b\u8d4b\u503c\u3002
    \u6700\u540e\u7684\u7ed3\u679c\uff0csignal \u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\uff0c\u5b83\u7684\u7c7b\u578b\u662f void( void(*)(int, void(*)(int))) (int)                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : zivyou <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @zivyou void(*signal(int, void (*)(int)))(int); \u662f\u4e00\u4e2a\u7c7b\u578b\u7ed9\u8fd9\u4e2a\u7c7b\u578b\u8d4b\u503c\u3002 => \u662f\u5b9a\u4e49\u67d0\u4e2a\u7c7b\u578b\u7684\u53d8\u91cf                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : Vibra <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 void (*)(int) \u662f\u4e00\u4e2a\u7c7b\u578b(\u51fd\u6570\u6307\u9488);
    signal(int, void (*)(int)) \u662f\u4e00\u4e2a\u51fd\u6570\u7684\u5b9a\u4e49<\/p>\n
    \u8fd9\u4e24\u4e2a\u80fd\u770b\u61c2,,,\u7136\u540e\u63a5\u4e0b\u6765 *signal \u662f\u4ec0\u4e48\u610f\u601d?
    \u6211\u7406\u89e3\u7684\u662f, signal \u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6307\u9488,,,\u5c31\u662f signal \u524d\u9762\u7684*,,\u4f46\u662f*\u6ca1\u6709\u58f0\u660e\u7c7b\u578b…
    \u8fd8\u6709,,,\u7ed9\u6307\u9488\u8d4b\u7c7b\u578b, \u4e0d\u5e94\u8be5\u662f\u62ec\u53f7\u5199\u524d\u9762\u5417? \u6bd4\u5982 int *a = (int *) malloc(sizeof(int)); \u8fd9\u6837…                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : ho121 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 void(*signal(int, void (*)(int)))(int);
    \u8fd9\u53e5\u662f\u4e00\u4e2a\u51fd\u6570\u58f0\u660e\uff0csignal \u662f\u51fd\u6570\u540d\uff0c\u63a5\u53d7\u7684\u53c2\u6570\u7c7b\u578b\u662f(int, void (*)(int))\uff0c\u8fd4\u56de\u503c\u7c7b\u578b\u662f void (*)(int)                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : Vibra <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @zivyou \u8fd9\u4e2a void( void(*)(int, void(*)(int))) (int) \u6700\u540e\u4e00\u4e2a int \u662f\u4ec0\u4e48\u610f\u601d                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : Vibra <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @ho121 \u610f\u601d\u662f, \u8fd4\u56de\u503c\u8fd8\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u662f\u5417? 
    `signal(SIGALRM, wakeup);` \u8fd9\u4e2a\u4ee3\u7801\u662f\u53ef\u4ee5\u901a\u8fc7\u7684, \u7136\u540e\u8fd9\u4e2a `signal(SIGALRM, wakeup)(0);`\u53ef\u4ee5\u7f16\u8bd1\u901a\u8fc7, \u8fd0\u884c\u4e0d\u6210\u529f
    [1] 49420 segmentation fault .\/a.out                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : ho121 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @Vibra \u662f\u7684\u3002\u5355\u4ece\u8fd9\u53e5\u4ee3\u7801\u6765\u770b\uff0c\u770b\u4e0d\u51fa\u4e3a\u4ec0\u4e48\u51fa\u9519                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : whoami9894 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5c31\u662f#4 \u7684\u7b54\u6848<\/p>\n
    “`c
    void t(int i) {
     printf(“%dn”, i);
    }<\/p>\n
    void(*signal(int i, void(*f)(int)))(int i) {
     f(i);
     return &t; 
    }<\/p>\n
    int main() {
     signal(0, &t)(1);
     return 0;
    }
    “`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : Vibra <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @whoami9894 \u662f\u7684, \u662f 4 \u7684\u7b54\u6848,,\u6211\u73b0\u5728\u5df2\u7ecf\u660e\u767d\u4e86..\u611f\u8c22\u611f\u8c22                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : wangyzj <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @whoami9894 #8 \u8fd9\u6bb5\u6ca1\u95ee\u9898\uff0c\u4e3b\u8c03\u7528(int)\u6709\u95ee\u9898\u770b\u770b\u5176\u4ed6\u4ee3\u7801\u628a                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    \u8bdd\u8bf4\u8fd9\u6bb5\u4ee3\u7801\u4ec0\u4e48\u610f\u601d \u8cc7\u6df1\u5927\u4f6c :…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/108188"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=108188"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/108188\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=108188"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=108188"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=108188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}