{"id":2566,"date":"2018-12-18T21:47:10","date_gmt":"2018-12-18T13:47:10","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=2566"},"modified":"2018-12-18T21:47:10","modified_gmt":"2018-12-18T13:47:10","slug":"gdb-attach%e5%88%b0%e5%b7%b2%e7%bb%8f%e5%ad%98%e5%9c%a8%e7%9a%84%e8%bf%9b%e7%a8%8b%e8%bf%9b%e8%a1%8c%e5%9c%a8%e7%ba%bf%e8%b0%83%e8%af%95-%e8%83%bd%e8%8e%b7%e5%8f%96%e5%bd%93%e5%89%8d%e6%a0%88","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/2566","title":{"rendered":"gdb attach\u5230\u5df2\u7ecf\u5b58\u5728\u7684\u8fdb\u7a0b\u8fdb\u884c\u5728\u7ebf\u8c03\u8bd5——\u80fd\u83b7\u53d6\u5f53\u524d\u6808\u7684\u6240\u6709\u53d8\u91cf\u503c\uff01"},"content":{"rendered":"
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\u00a0 \u00a0 \u00a0 \u00a0\u4e0d\u4e45\u524d\uff0c \u6211\u4eec\u73a9\u8fc7valgrind\u5b9a\u4f4d\u7a0b\u5e8f\u7684\u5404\u7c7b\u5185\u5b58\u95ee\u9898\uff0c \u5f53\u65f6\u975e\u5e38\u5e0c\u671bvalgrind\u80fd\u5bf9\u4e00\u4e2a\u5df2\u7ecf\u5b58\u5728\u7684\u8fdb\u7a0b\u8fdb\u884cattach\u5728\u7ebf\u8c03\u8bd5\uff0c \u540e\u6765\u770b\u4e86valgrind\u7684\u539f\u7406\uff0c \u53d1\u73b0\u8fd9\u6837\u4e0d\u53ef\u884c\u3002 \u53ea\u80fd\u8ba9valgrind\u91cd\u65b0\u62c9\u53d6\u65b0\u8fdb\u7a0b\u8fdb\u884c\u8c03\u8bd5\u3002<\/div>\n
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\u00a0 \u00a0 \u00a0 \u00a0\u5728\u524d\u9762\u7684\u6587\u7ae0\u4e2d\uff0c \u4e5f\u4ecb\u7ecd\u4e86kill -6\u548cabort\u51fd\u6570\uff0c \u8ba9\u7a0b\u5e8fcore dump\u6765\u83b7\u53d6\u5f53\u65f6\u6808\u7684\u503c\uff0c \u5176\u5b9e\uff0c \u8fd9\u6837\u4f3c\u4e4e\u6ca1\u6709\u5fc5\u8981\u3002 \u6162\u6162\u6765\u770b\u3002<\/p>\n

\u6211\u4eec\u518d\u56de\u5fc6\u4e0bstrace\u547d\u4ee4\uff0c \u53ef\u4ee5\u7528strace -p pid\uff0c \u9644\u7740\u5230\u4e00\u4e2a\u5df2\u7ecf\u5728\u8dd1\u7684\u8fdb\u7a0b\u4e0a\uff0c \u5b9e\u65f6\u89c2\u5bdf\u8fdb\u7a0b\u3002 \u90a3\u4e48\uff0c gdb\u80fd\u505a\u5230\u5417\uff1f \u80fd\uff01 \u8fd9\u5c31\u662fgdb\u7684attch\u8c03\u8bd5\uff0c \u53ef\u4ee5\u83b7\u53d6\u5f53\u524d\u6808\u7684\u6240\u6709\u53d8\u91cf\u503c\u3002<\/p>\n

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\u56de\u5fc6\u4e00\u4e0b\uff0c \u6bd4\u5982\u7f16\u8bd1\uff08\u52a0-g\uff09\u540e\u751f\u6210\u4e86a.out\u6587\u4ef6\uff1a<\/p>\n

1. \u00a0\u53ef\u4ee5\u76f4\u63a5\u7528gdb a.out\u6765\u8c03\u8bd5, \u00a0\u5176\u5b9egdb\u62c9\u53d6\u4e86\u65b0\u7684\u8fdb\u7a0b\u3002 \u7c7b\u4f3c\u4e8evalgrind.<\/p>\n

2. \u00a0\u5982\u679c\u6709core\u6587\u4ef6\uff0c \u90a3\u4e48\u7528gdb a.out core, \u00a0\u6b64\u65f6\u6ca1\u6709\u62c9\u53d6\u65b0\u7684\u8fdb\u7a0b\u3002 \u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c \u8fd9\u79cd\u65b9\u5f0f\u5e38\u7528\u3002<\/p>\n

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\u5f88\u591a\u65f6\u5019\uff0c \u5728\u670d\u52a1\u7aef\uff0c \u8fdb\u7a0b\u5df2\u7ecf\u8dd1\u8d77\u6765\uff0c \u6b64\u65f6\u4e0d\u518d\u9002\u5408\u7528gdb\u6765\u62c9\u53d6\u65b0\u7684\u8fdb\u7a0b\uff0c \u800c\u671f\u671b\u7528gdb\u9644\u7740\u5230\u8fd9\u4e2a\u5df2\u7ecf\u5b58\u5728\u7684\u8fdb\u7a0b\uff0c \u5982\u4e0b\u4e24\u79cd\u65b9\u5f0f\u662f\u7b49\u4ef7\u7684\uff1a<\/p>\n

3. gdb attach pid \u00a0\uff08\u6ce8\u610f\uff0c \u6ca1\u6709\u62c9\u53d6\u65b0\u7684\u8fdb\u7a0b\uff09<\/p>\n

4. gdb a.out pid \u00a0 \u00a0\uff08\u6ce8\u610f\uff0c \u6ca1\u6709\u62c9\u53d6\u65b0\u7684\u8fdb\u7a0b\uff09<\/p>\n

 <\/p>\n

\u770b\u7a0b\u5e8f\uff1a<\/p>\n

#include <iostream>\r\n#include <cmath>\r\nusing namespace std;\r\n \r\nstruct Point\r\n{\r\n    int x;\r\n    int y;\r\n};\r\n \r\nint main() \r\n{\r\n    Point po;\r\n    po.x = 1;\r\n    po.y = 2;\r\n    float distance = sqrt(po.x * po.x + po.y * po.y);\r\n    \r\n    getchar();\r\n    return 0;\r\n}<\/pre>\n
\u770b\u770b\u5229\u7528\u65b9\u6cd53,4\u6765\u8c03\u8bd5\uff08\u8fdb\u7a0b\u8fd0\u884c\u5728\u4e00\u4e2a\u7a97\u53e3\uff0c \u8c03\u8bd5\u5728\u53e6\u5916\u4e00\u4e2a\u7a97\u53e3\uff09\uff1a<\/p>\n
xxxxxx $ ps -aux | grep a.out<\/span>\r\nWarning: bad ps syntax, perhaps a bogus '-'<\/span>? See http:\/\/procps.sf.net\/faq.html<\/span>\r\n1000<\/span>      3265<\/span>  0.0<\/span>  0.0<\/span>   2804<\/span>   876<\/span> pts\/1<\/span>    S+   08<\/span>:18<\/span>   0<\/span>:00<\/span> .\/a.out<\/span>\r\n1000<\/span>     20400<\/span>  0.0<\/span>  0.0<\/span>   3072<\/span>   804<\/span> pts\/0<\/span>    S+   21<\/span>:02<\/span>   0<\/span>:00<\/span> grep a.out<\/span>\r\nxxxxxx $ \r\nxxxxxx $ \r\nxxxxxx $ \r\nxxxxxx $ gdb attach 3265<\/span>\r\nGNU gdb 6.6<\/span>\r\nCopyright (C) 2006<\/span> Free Software Foundation, Inc.\r\nGDB is<\/span> free software, covered by<\/span> the GNU General Public License, and you are\r\nwelcome to change it and\/or distribute copies of it under certain conditions.\r\nType \"show copying\"<\/span> to see the conditions.\r\nThere is<\/span> absolutely no warranty for<\/span> GDB.  Type \"show warranty\"<\/span> for<\/span> details.\r\nThis GDB was configured as<\/span> \"i586-suse-linux\"<\/span>...\r\nattach: No such file or directory.\r\nAttaching to process 3265<\/span>\r\nReading symbols from<\/span> \/data\/home\/xxxxxx\/a.out<\/span>...done.\r\nUsing host libthread_db library \"\/lib\/libthread_db.so.1\"<\/span>.\r\nReading symbols from<\/span> \/lib\/libonion.so...done.\r\nLoaded symbols for<\/span> \/lib\/libonion.so\r\nReading symbols from<\/span> \/usr\/lib\/libstdc++.so.6<\/span>...done.\r\nLoaded symbols for<\/span> \/usr\/lib\/libstdc++.so.6<\/span>\r\nReading symbols from<\/span> \/lib\/libm.so.6<\/span>...done.\r\nLoaded symbols for<\/span> \/lib\/libm.so.6<\/span>\r\nReading symbols from<\/span> \/lib\/libgcc_s.so.1<\/span>...done.\r\nLoaded symbols for<\/span> \/lib\/libgcc_s.so.1<\/span>\r\nReading symbols from<\/span> \/lib\/libc.so.6<\/span>...done.\r\nLoaded symbols for<\/span> \/lib\/libc.so.6<\/span>\r\nReading symbols from<\/span> \/lib\/libdl.so.2<\/span>...done.\r\nLoaded symbols for<\/span> \/lib\/libdl.so.2<\/span>\r\nReading symbols from<\/span> \/lib\/libpthread.so.0<\/span>...done.\r\n[Thread debugging using libthread_db enabled<\/span>]\r\n[New Thread -1211562320 (LWP 3265)<\/span>]\r\nLoaded symbols for<\/span> \/lib\/libpthread.so.0<\/span>\r\nReading symbols from<\/span> \/lib\/ld-linux.so.2<\/span>...done.\r\nLoaded symbols for<\/span> \/lib\/ld-linux.so.2<\/span>\r\n0xb7d5eb0e<\/span> in<\/span> __read_nocancel () from<\/span> \/lib\/libc.so.6<\/span>\r\n(gdb) bt\r\n#0  0xb7d5eb0e in __read_nocancel () from \/lib\/libc.so.6<\/span>\r\n#1  0xb7d0e0d8 in _IO_file_read_internal () from \/lib\/libc.so.6<\/span>\r\n#2  0xb7d0f35b in _IO_new_file_underflow () from \/lib\/libc.so.6<\/span>\r\n#3  0xb7d0fa9b in _IO_default_uflow_internal () from \/lib\/libc.so.6<\/span>\r\n#4  0xb7d10ddd in __uflow () from \/lib\/libc.so.6<\/span>\r\n#5  0xb7d0aebe in getchar () from \/lib\/libc.so.6<\/span>\r\n#6  0x0804867c in main () at test.cpp:18<\/span>\r\n(gdb) f 6<\/span>\r\n#6  0x0804867c in main () at test.cpp:18<\/span>\r\n18<\/span>              getchar();\r\n(gdb) i locals\r\npo = {x = 1<\/span>, y = 2<\/span>}\r\ndistance = 2.23606801<\/span>\r\n(gdb) q\r\nThe program is<\/span> running.  Quit anyway<\/span> (and detach it<\/span>)? (y or n<\/span>) y\r\nDetaching from<\/span> program: \/data\/home\/xxxxxx\/a.out<\/span>, process 3265\r\nxxxxxx $ \r\nxxxxxx $ \r\nxxxxxx $ \r\nxxxxxx $ \r\nxxxxxx $ \r\nxxxxxx $ \r\nxxxxxx $ gdb a.out<\/span> 3265\r\nGNU gdb 6.6\r\nCopyright<\/span> (C<\/span>) 2006 Free Software Foundation, Inc.\r\nGDB is<\/span> free software, covered by<\/span> the GNU General Public License, and you are\r\nwelcome to change it and\/or distribute copies of it under certain conditions.\r\nType \"show copying\" to see the conditions.\r\nThere is<\/span> absolutely no warranty for<\/span> GDB.  Type \"show warranty\" for<\/span> details.\r\nThis GDB was configured as<\/span> \"i586-suse-linux\"...\r\nUsing host libthread_db library \"\/lib\/libthread_db.so.1\".\r\nAttaching to program: \/data\/home\/xxxxxx\/a.out<\/span>, process 3265\r\nReading symbols from<\/span> \/lib\/libonion.so...done.\r\nLoaded symbols for<\/span> \/lib\/libonion.so\r\nReading symbols from<\/span> \/usr\/lib\/libstdc++.so.6...done.\r\nLoaded symbols for<\/span> \/usr\/lib\/libstdc++.so.6\r\nReading symbols from<\/span> \/lib\/libm.so.6...done.\r\nLoaded symbols for<\/span> \/lib\/libm.so.6\r\nReading symbols from<\/span> \/lib\/libgcc_s.so.1...done.\r\nLoaded symbols for<\/span> \/lib\/libgcc_s.so.1\r\nReading symbols from<\/span> \/lib\/libc.so.6...done.\r\nLoaded symbols for<\/span> \/lib\/libc.so.6\r\nReading symbols from<\/span> \/lib\/libdl.so.2...done.\r\nLoaded symbols for<\/span> \/lib\/libdl.so.2\r\nReading symbols from<\/span> \/lib\/libpthread.so.0...done.\r\n[Thread debugging using<\/span> libthread_db enabled]\r\n[New Thread -1211562320 (LWP 3265<\/span><\/span>)]\r\nLoaded symbols for<\/span> \/lib\/libpthread.so.0\r\nReading symbols from<\/span> \/lib\/ld-linux.so.2...done.\r\nLoaded symbols for<\/span> \/lib\/ld-linux.so.2\r\n0xb7d5eb0e in<\/span> __read_nocancel<\/span> () from<\/span> \/lib\/libc.so.6\r\n(gdb<\/span>) bt\r\n#0  0xb7d5eb0e in<\/span> __read_nocancel<\/span> () from<\/span> \/lib\/libc.so.6\r\n#1  0xb7d0e0d8 in<\/span> _IO_file_read_internal<\/span> () from<\/span> \/lib\/libc.so.6\r\n#2  0xb7d0f35b in<\/span> _IO_new_file_underflow<\/span> () from<\/span> \/lib\/libc.so.6\r\n#3  0xb7d0fa9b in<\/span> _IO_default_uflow_internal<\/span> () from<\/span> \/lib\/libc.so.6\r\n#4  0xb7d10ddd in<\/span> __uflow<\/span> () from<\/span> \/lib\/libc.so.6\r\n#5  0xb7d0aebe in<\/span> getchar<\/span> () from<\/span> \/lib\/libc.so.6\r\n#6  0x0804867c in<\/span> main<\/span> () at test.cpp:18\r\n(gdb<\/span>) f 6\r\n#6  0x0804867c in<\/span> main<\/span> () at test.cpp:18\r\n18              getchar<\/span>()<\/span>;\r\n(gdb) i locals\r\npo = {x = 1<\/span>, y = 2<\/span>}\r\ndistance = 2.23606801<\/span>\r\n(gdb) <\/code><\/pre>\n
\u597d\uff0c \u4ecb\u7ecd\u5b8c\u6bd5\u3002 \u7b80\u5355\u3002<\/p>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"
\u00a0 \u00a0 \u00a0 \u00a0\u4e0d\u4e45\u524d\uff0c \u6211\u4eec\u73a9\u8fc7valg<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-2566","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/2566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=2566"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/2566\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=2566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=2566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=2566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}