{"id":577,"date":"2017-10-19T17:48:37","date_gmt":"2017-10-19T09:48:37","guid":{"rendered":"https:\/\/i007.cc\/wordpress\/?p=577"},"modified":"2017-11-24T15:17:21","modified_gmt":"2017-11-24T07:17:21","slug":"gcore-%e8%8e%b7%e5%8f%96%e7%a8%8b%e5%ba%8fcore-dump-file-%e4%bd%86%e7%a8%8b%e5%ba%8f%e4%b8%8d%e7%94%a8%e9%80%80%e5%87%ba%ef%bc%8cgdb-%e5%88%86%e6%9e%90core%e8%bd%ac","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/577","title":{"rendered":"gcore \u83b7\u53d6\u7a0b\u5e8fcore dump file \u4f46\u7a0b\u5e8f\u4e0d\u7528\u9000\u51fa\uff0cgdb \u5206\u6790core[\u8f6c]"},"content":{"rendered":"
\n

\u8f6c\u8f7d\u5730\u5740\uff1ahttp:\/\/hi.baidu.com\/widebright\/item\/e94ea43535711f4a3075a1d0<\/a><\/p>\n<\/div>\n

\n
<\/div>\n
\n

\u672c\u6587\u5305\u542b\u5982\u4e0b\u90e8\u5206\u5185\u5bb9
\n<\/strong><\/p>\n

1. Linux\u5185\u6838\u91cc\u9762\u751f\u6210\u7684core file\u6587\u4ef6\u76f8\u5173\u7684\u4ee3\u7801<\/strong><\/p>\n

2. core dump file \u76f8\u5173\u7684\u8bbe\u7f6e<\/p>\n

3. \u5982\u4f55\u5728\u7a0b\u5e8f\u4e2d\u8c03\u7528\u4ee3\u7801\u751f\u6210 core dump file\uff0c\u7a0b\u5e8f\u53c8\u4e0d\u7528\u9000\u51fa\u3002<\/p>\n

4. \u4f7f\u7528gdb\u5206\u6790 core dump file \u6587\u4ef6<\/p>\n

5.\u00a0\u00a0\u7528gdb \u751f\u6210core\u6587\u4ef6<\/strong><\/p>\n

<\/p>\n

<\/p>\n

1. Linux\u5185\u6838\u91cc\u9762\u751f\u6210\u7684core file\u6587\u4ef6\u76f8\u5173\u7684\u4ee3\u7801<\/strong><\/p>\n

——————————————————————
\n<\/strong><\/p>\n

get_signal_to_deliver<\/a>\u00a0\u00a0\u00a0\u00a0\u8fd9\u91cc\u6ca1\u5224\u65ad\u662f\u4e0d\u662f\u4fe1\u53f7\u662f\u4e0d\u662f\u8981\u89e6\u53d1core dump\uff0c\u7136\u540e\u8c03\u7528<\/p>\n

do_coredump<\/a><\/p>\n

\u6700\u540e\u4f1a\u8c03\u7528elf_core_dump<\/a><\/p>\n

\u91cc\u9762\u6709\u4e00\u6bb5\u8fd9\u6837\u53d8\u91cfvma\u7684\u5faa\u73af\uff0c\u5e94\u8be5\u662f\u4fdd\u5b58\u6240\u6709\u5185\u5b58\u7684\uff1f \u4e0d\u8fc7\u5e94\u8be5\u8fd8\u6709\u5176\u4ed6\u4fe1\u606f\u7684<\/p>\n

1980<\/a>\u00a01981<\/a>\u00a0for (vma<\/a>\u00a0=\u00a0first_vma<\/a>(current<\/a>,\u00a0gate_vma<\/a>);\u00a0vma<\/a>\u00a0!=\u00a0NULL<\/a>;1982<\/a>vma<\/a>\u00a0=\u00a0next_vma<\/a>(vma<\/a>,\u00a0gate_vma<\/a>)) {1983<\/a>\u00a0struct\u00a0elf_phdr<\/a>\u00a0phdr<\/a>;1984<\/a>1985<\/a>\u00a0phdr<\/a>.p_type<\/a>\u00a0=\u00a0PT_LOAD<\/a>;1986<\/a>\u00a0phdr<\/a>.p_offset<\/a>\u00a0=offset<\/a>;1987<\/a>\u00a0phdr<\/a>.p_vaddr<\/a>\u00a0=\u00a0vma<\/a>->vm_start<\/a>;1988<\/a>\u00a0phdr<\/a>.p_paddr<\/a>\u00a0= 0;1989<\/a>\u00a0phdr<\/a>.p_filesz<\/a>\u00a0=\u00a0vma_dump_size<\/a>(vma<\/a>,\u00a0cprm<\/a>->mm_flags<\/a>);1990<\/a>\u00a0phdr<\/a>.p_memsz<\/a>\u00a0=\u00a0vma<\/a>->vm_end<\/a>\u00a0–\u00a0vma<\/a>->vm_start<\/a>;1991<\/a>\u00a0offset<\/a>\u00a0+=\u00a0phdr<\/a>.p_filesz<\/a>;1992<\/a>\u00a0phdr<\/a>.p_flags<\/a>\u00a0=\u00a0vma<\/a>->vm_flags<\/a>\u00a0&\u00a0VM_READ<\/a>\u00a0?\u00a0PF_R<\/a>\u00a0: 0;1993<\/a>\u00a0if (vma<\/a>->vm_flags<\/a>\u00a0&\u00a0VM_WRITE<\/a>)1994<\/a>\u00a0phdr<\/a>.p_flags<\/a>\u00a0|=\u00a0PF_W<\/a>;1995<\/a>\u00a0if (vma<\/a>->vm_flags<\/a>\u00a0&\u00a0VM_EXEC<\/a>)1996<\/a>\u00a0phdr<\/a>.p_flags<\/a>\u00a0|=\u00a0PF_X<\/a>;1997<\/a>\u00a0phdr<\/a>.p_align<\/a>\u00a0=\u00a0ELF_EXEC_PAGESIZE<\/a>;1998<\/a>1999<\/a>\u00a0size<\/a>\u00a0+= sizeof(phdr<\/a>);2000<\/a>\u00a0if (size<\/a>\u00a0>\u00a0cprm<\/a>->limit<\/a>2001<\/a>\u00a0|| !dump_write<\/a>(cprm<\/a>->file<\/a>, &phdr<\/a>, sizeof(phdr<\/a>)))2002<\/a>\u00a0goto\u00a0end_coredump<\/a>;2003<\/a>\u00a0}<\/p>\n

<\/p>\n

<\/p>\n

<\/p>\n

core dump file \u76f8\u5173\u7684\u8bbe\u7f6e\uff1a<\/strong>
\n—————————————
\n\u9ed8\u8ba4 linux \u662f\u6ca1\u6709dump core\u6587\u4ef6\u7684\uff0c\u9700\u8981\u8bbe\u7f6e\u4e00\u4e0b
\nwidebright@:~\/\u684c\u9762$ ulimit -a
\ncore file size\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(blocks, -c) 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0>>>>>>>>>>>>>>>>>\u8fd9\u4e2a\u8bbe\u4e3a0\u4e86\uff0c\u4e0d\u4f1a\u6709core dump\u4e86
\ndata seg size\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(kbytes, -d) unlimited
\nscheduling priority\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(-e) 20
\nfile size\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(blocks, -f) unlimited
\npending signals\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(-i) 16382
\nmax locked memory\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(kbytes, -l) 64
\nmax memory size\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(kbytes, -m) unlimited
\nopen files\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(-n) 1024
\npipe size\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(512 bytes, -p) 8
\nPOSIX message queues\u00a0\u00a0\u00a0\u00a0\u00a0(bytes, -q) 819200
\nreal-time priority\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(-r) 0
\nstack size\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(kbytes, -s) 8192
\ncpu time\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(seconds, -t) unlimited
\nmax user processes\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(-u) unlimited
\nvirtual memory\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(kbytes, -v) unlimited
\nfile locks\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(-x) unlimited<\/p>\n

ulimit -c 1000\u00a0\u00a0\u6700\u5927\u5141\u8bb8core\u6587\u4ef6\u67091000\u5757 \uff1f
\nulimit -c unlimited\u00a0\u00a0\u4e0d\u505a\u9650\u5236<\/p>\n

\u53e6\u6709\/proc\/sys\/kernel\/core_pattern\u00a0\u00a0\u00a0core_pipe_limit\u00a0\u00a0core_uses_pid \u7b49\u6587\u4ef6\u53ef\u4ee5\u63a7\u5236core \u6587\u4ef6\u7684\u540d\u5b57\uff0c\u5177\u4f53\u53ef\u4ee5\u770b\u4e0a\u9762\u8bf4\u7684\u51fd\u6570\u7684\u5b9e\u73b0\u3002
\n\u6216\u8005\u5728\u5185\u6838\u91cc\u9762\u67e5\u627ecore_pattern\u53d8\u91cf\u3002<\/p>\n

———————————————-
\n\u5982\u4f55\u4e3a\u81ea\u5df1\u7684\u8fdb\u7a0b\u4ea7\u751fcore \u6587\u4ef6\uff0c\u53c8\u4e0d\u60f3\u9000\u51fa\u8fd9\u4e2a\u8fdb\u7a0b\uff1f<\/strong><\/p>\n

\u7cfb\u7edf\u53ea\u5728\u7a0b\u5e8f\u5d29\u6e83\u9000\u51fa\u65f6\u81ea\u52a8\u4ea7\u751fcore file\u3002 \u6709\u7684\u4eba\u50cf\u81ea\u5df1\u5904\u7406\u5f02\u5e38\u4fe1\u53f7\uff0c\u7136\u540e\u81ea\u5df1\u4ea7\u751f\u4e00\u4e2acore file\uff0c\u7136\u540e\u7ee7\u7eed\u8fd0\u884c\u3002\u90a3\u8be5\u600e\u4e48\u529e\u5462\uff1f \u5982\u679c\u81ea\u5df1\u5728\u60f3\u4ea7\u751fcore file\u7684\u65f6\u5019\uff0c\u8c03\u7528abort \u51fd\u6570\u6765\u751f\u6210\u6587\u4ef6\uff0ccore\u6587\u4ef6\u662f\u751f\u6210\u4e86\uff0c\u4f46\u81ea\u5df1\u7684\u8fdb\u7a0b\u4e5f\u9000\u51fa\u4e86\u3002\u4e3a\u4e86\u8fdb\u7a0b\u9000\u51fa\uff0c\u5728\u7f51\u4e0a\u627e\u5230\u4e24\u4e2a\u529e\u6cd5\uff1a<\/p>\n

=============================================
\n\u65b9\u6cd5\u4e00\uff1a<\/strong>\u00a0\u5148fork\u521b\u5efa\u4e00\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u5b50\u8fdb\u7a0b\u62e5\u6709\u548c\u7236\u8fdb\u7a0b\u4e00\u6837\u7684
\n\u5185\u5b58\u7a7a\u95f4\u4e86\uff0c\u7136\u540e\u5728\u5b50\u8fdb\u7a0b\u89e6\u53d1abort\u4fe1\u53f7\uff0c\u8ba9\u5b50\u8fdb\u7a0b\u8fdb\u884ccore\u00a0
\ndump\u3002 \u8fd9\u4e2afork\u770b\u6765\u8fd8\u6bd4\u8f83\u6709\u610f\u601d\u7684\uff0c\u5b50\u8fdb\u7a0b\u62e5\u6709\u7236\u8fdb\u7a0b\u7684\u4e00\u6837
\n\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u4e0a\u6b21\u624d\u770b\u5230\u6709\u4eba\u60f3\u5b9a\u65f6\u5b58\u6863\u5907\u4efd\u8fdb\u7a0b\u6570\u636e\u65f6\uff0c\u4e5f\u662f\u60f3fork\u4e00\u4e2a
\n\u5b50\u8fdb\u7a0b\u51fa\u6765\uff0c\u8bf4\u662f\u8fd9\u6837\u7236\u8fdb\u7a0b\u5728\u5907\u4efd\u65f6\u4e5f\u4e0d\u7528\u540c\u6b65\u7b49\u5f85\u4e86\u3002\u5b50\u8fdb\u7a0b\u53ef\u4ee5
\n\u8bbf\u95ee\u7236\u8fdb\u7a0b\u7684\u5185\u5bb9\u5427\u3002
\n=============================================
\n\u65b9\u6cd5\u6765\u81ea
\nhttp:\/\/stackoverflow.com\/questions\/131439\/how-can-a-c-program-produce-a-core-dump-of-itself-without-terminating<\/p>\n

#include
\n#include
\n#include
\n#include
\n#include
\n#include
\n#include
\n#include<\/p>\n

#define mcrosec 1000000<\/p>\n

void create_dump(void)
\n{
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int * invalid = NULL;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(!fork()) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ Crash the app in your favorite way here
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0abort();\u00a0\u00a0\/\/\u548c kill(getpid(), SIGABRT);\u5e94\u8be5\u4e00\u6837\u7684
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0*invalid = 42;\u00a0\u00a0\u00a0\u00a0\/\/\u5e94\u8be5\u4e0d\u4f1a\u5230\u8fd9\u91cc\u6765\u4e86\u5427\u3002
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}
\n}<\/p>\n

int main(int argc,char **argv)
\n{
\n\u00a0\u00a0int i =0;
\n\u00a0\u00a0while(1){
\n\u00a0\u00a0\u00a0\u00a0\u00a0usleep( 2*mcrosec);
\n\u00a0\u00a0\u00a0\u00a0\u00a0i++;
\n\u00a0\u00a0\u00a0\u00a0\u00a0printf(“ddd\\n”);
\n\u00a0\u00a0\u00a0\u00a0\u00a0if( i==5)\u00a0\u00a0\u00a0\u00a0
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0create_dump();
\n\u00a0\u00a0\u00a0\u00a0\u00a0
\n\u00a0\u00a0}
\n\u00a0\u00a0return 0;
\n}<\/p>\n

——————————————————-<\/p>\n

\u4f7f\u7528gdb\u5206\u6790\u4e00\u4e0b\u8fd9\u4e2acore\u6587\u4ef6\u54c8<\/strong><\/p>\n

widebright@:~\/\u684c\u9762$ gdb -core core\u00a0
\nGNU gdb (Ubuntu\/Linaro 7.2-1ubuntu11) 7.2
\nCopyright (C) 2010 Free Software Foundation, Inc.
\nLicense GPLv3+: GNU GPL version 3 or later
\nThis is free software: you are free to change and redistribute it.
\nThere is NO WARRANTY, to the extent permitted by law.\u00a0\u00a0Type “show copying”
\nand “show warranty” for details.
\nThis GDB was configured as “i686-linux-gnu”.
\nFor bug reporting instructions, please see:
\n.
\n[New Thread 3320]
\nCore was generated by `.\/a.out’.
\nProgram terminated with signal 6, Aborted.
\n#0\u00a0\u00a00x00982416 in __kernel_vsyscall ()
\n(gdb) file .\/a.out\u00a0
\nReading symbols from \/home\/widebright\/\u684c\u9762\/a.out…done.
\n(gdb) bt\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\/\u67e5\u51fa\u9519\u65f6\u5019\u7684\u5806\u6808
\n#0\u00a0\u00a00x00982416 in __kernel_vsyscall ()
\n#1\u00a0\u00a00x00ec6e71 in ?? ()
\n#2\u00a0\u00a00x00ff8ff4 in ?? ()
\n#3\u00a0\u00a00x00eca34e in ?? ()
\n#4\u00a0\u00a00x00000006 in ?? ()
\n#5\u00a0\u00a00xbfa5fd80 in ?? ()
\n#6\u00a0\u00a00x0804845f in create_dump () at main.c:18
\n#7\u00a0\u00a00x0804849c in main (argc=1, argv=0xbfa5ff04) at main.c:31
\n(gdb) frame 7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5207\u6362\u7684\u8c03\u7528main\u7684\u8c03\u7528\u5806\u6808\u73af\u5883\u4e0a\u53bb
\n#7\u00a0\u00a00x0804849c in main (argc=1, argv=0xbfa5ff04) at main.c:31
\n31\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0create_dump();<\/p>\n

(gdb) print i\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/i \u7b49\u4e8e5\u7684\u65f6\u5019\u8c03\u7528\u7684dump \u5475\u5475
\n$1 = 5<\/p>\n

=========================================
\n\u65b9\u6cd5\u4e8c<\/strong>\uff1a\u8c03\u7528gcore\u547d\u4ee4\u4e3a\u6307\u5b9a\u7684\u8fdb\u7a0b\u751f\u6210core \u6587\u4ef6
\n=========================================
\nhttp:\/\/forums.freebsd.org\/archive\/index.php\/t-8268.html<\/p>\n

char cmd[50];
\nsprintf(cmd, “gcore %u”, getpid());
\nsystem(cmd);<\/p>\n

———————————–
\nwidebright@:~\/\u684c\u9762$ ps -ef |grep a.out\u00a0
\n1000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a03665\u00a0\u00a03546\u00a0\u00a00 10:53 pts\/0\u00a0\u00a0\u00a0\u00a000:00:00 .\/a.out
\n1000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a03669\u00a0\u00a03665\u00a0\u00a00 10:53 pts\/0\u00a0\u00a0\u00a0\u00a000:00:00 [a.out]
\n1000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a03686\u00a0\u00a02937\u00a0\u00a00 10:53 pts\/2\u00a0\u00a0\u00a0\u00a000:00:00 grep –color=auto a.out<\/p>\n

widebright@:~\/\u684c\u9762$ sudo gcore 3665
\n[sudo] password for widebright:\u00a0
\n0x00c5b416 in __kernel_vsyscall ()
\nSaved corefile core.3665<\/p>\n

—————————
\nwidebright@:~\/\u684c\u9762$ gdb -core core.3665\u00a0
\nGNU gdb (Ubuntu\/Linaro 7.2-1ubuntu11) 7.2
\nCopyright (C) 2010 Free Software Foundation, Inc.
\nLicense GPLv3+: GNU GPL version 3 or later
\nThis is free software: you are free to change and redistribute it.
\nThere is NO WARRANTY, to the extent permitted by law.\u00a0\u00a0Type “show copying”
\nand “show warranty” for details.
\nThis GDB was configured as “i686-linux-gnu”.
\nFor bug reporting instructions, please see:
\n.
\n[New Thread 3665]
\nCore was generated by `\/home\/widebright\/\u684c\u9762\/a.out’.
\n#0\u00a0\u00a00x00c5b416 in __kernel_vsyscall ()
\n(gdb) file a.out\u00a0
\nReading symbols from \/home\/widebright\/\u684c\u9762\/a.out…done.
\n(gdb) bt
\n#0\u00a0\u00a00x00c5b416 in __kernel_vsyscall ()
\n#1\u00a0\u00a00x00d2afc0 in ?? ()
\n#2\u00a0\u00a00x00d5c1ac in ?? ()
\n#3\u00a0\u00a00xbfed8b90 in ?? ()
\n#4\u00a0\u00a00x08048481 in main (argc=1, argv=0xbfed8c74) at main.c:27
\n(gdb) p i
\nNo symbol “i” in current context.
\n(gdb) frame 4
\n#4\u00a0\u00a00x08048481 in main (argc=1, argv=0xbfed8c74) at main.c:27
\n27\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0usleep( 2*mcrosec);
\n(gdb) p i
\n$1 = 48<\/p>\n

=============================
\n\u5728\u6211\u673a\u5668\u4e0agcore\u547d\u4ee4\u5c31\u4e2ashell\u811a\u672c\uff0c\u81ea\u52a8\u751f\u6210\u4e00\u4e2agdb\u7684\u811a\u672c\uff0cattach \u6307\u5b9a\u7684\u8fdb\u7a0b\uff0c\u7136\u540e\u8c03\u7528gcore\u8fd9\u4e2agdb \u547d\u4ee4\u751f\u6210core\u6587\u4ef6\uff0c\u7136\u540edetach\u8ba9\u8fdb\u7a0b\u7ee7\u7eed\u8fdb\u884c\u3002<\/p>\n

(gdb) help generate-core-file<\/strong>
\nSave a core file with the current state of the debugged process.
\nArgument is optional filename.\u00a0\u00a0Default filename is ‘core.’.<\/p>\n

(gdb) help gcore<\/strong>
\nSave a core file with the current state of the debugged process.
\nArgument is optional filename.\u00a0\u00a0Default filename is ‘core.’.<\/p>\n

widebright@:~\/\u684c\u9762$ file \/usr\/bin\/gcore
\n\/usr\/bin\/gcore: POSIX shell script text executable<\/p>\n

=============================<\/p>\n

cat \/usr\/bin\/gcore
\n#!\/bin\/sh<\/p>\n

#\u00a0\u00a0\u00a0Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010
\n#\u00a0\u00a0\u00a0Free Software Foundation, Inc.<\/p>\n

# This program is free software; you can redistribute it and\/or modify
\n# it under the terms of the GNU General Public License as published by
\n# the Free Software Foundation; either version 3 of the License, or
\n# (at your option) any later version.
\n#
\n# This program is distributed in the hope that it will be useful,
\n# but WITHOUT ANY WARRANTY; without even the implied warranty of
\n# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\u00a0\u00a0See the
\n# GNU General Public License for more details.
\n#
\n# You should have received a copy of the GNU General Public License
\n# along with this program.\u00a0\u00a0If not, see .<\/p>\n

#
\n# gcore.sh
\n# Script to generate a core file of a running program.
\n# It starts up gdb, attaches to the given PID and invokes the gcore command.
\n#<\/p>\n

if [ “$#” -eq “0” ]
\nthen
\n\u00a0\u00a0\u00a0echo “usage:\u00a0\u00a0gcore [-o filename] pid”
\n\u00a0\u00a0\u00a0exit 2
\nfi<\/p>\n

# Need to check for -o option, but set default basename to “core”.
\nname=core<\/p>\n

if [ “$1” = “-o” ]
\nthen
\n\u00a0\u00a0\u00a0if [ “$#” -lt “3” ]
\n\u00a0\u00a0\u00a0then
\n\u00a0\u00a0\u00a0# Not enough arguments.
\n\u00a0\u00a0\u00a0echo “usage:\u00a0\u00a0gcore [-o filename] pid”
\n\u00a0\u00a0\u00a0exit 2
\n\u00a0\u00a0\u00a0fi
\n\u00a0\u00a0\u00a0name=$2<\/p>\n

\u00a0\u00a0\u00a0# Shift over to start of pid list
\n\u00a0\u00a0\u00a0shift; shift
\nfi<\/p>\n

# Create a temporary file.\u00a0\u00a0Use mktemp if available, but cope if it is not.
\ntmpfile=`mktemp ${name}.XXXXXX 2>\/dev\/null` || {
\n\u00a0tmpfile=${name}.$$
\n\u00a0if test -e $tmpfile; then
\n\u00a0\u00a0\u00a0echo “Could not create temporary file $tmpfile”
\n\u00a0\u00a0\u00a0exit 1
\n\u00a0fi
\n\u00a0touch $tmpfile
\n}
\ntrap “rm -f $tmpfile” EXIT<\/p>\n

# Initialise return code.
\nrc=0<\/p>\n

# Loop through pids
\nfor pid in $*
\ndo
\n\u00a0\u00a0\u00a0# Write gdb script for pid $pid. \u00a0
\n\u00a0\u00a0\u00a0cat >>$tmpfile <<EOF
\nattach $pid
\ngcore $name.$pid
\ndetach
\nquit
\nEOF<\/p>\n

\u00a0\u00a0\u00a0gdb -x $tmpfile -batch<\/p>\n

\u00a0\u00a0\u00a0if [ -r $name.$pid ] ; then\u00a0
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0rc=0
\n\u00a0\u00a0\u00a0else
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0echo gcore: failed to create $name.$pid
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0rc=1
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0break
\n\u00a0\u00a0\u00a0fi<\/p>\n

done<\/p>\n

exit $rc
\n========================================<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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