黑寡妇英文怎么说:让程序崩溃时产生coredump

在 Windows 下我们已经习惯了用 Windbg 之类的工具调试 dump 文件，从而分析并排除程序运行时错误。在 Linux 下我们同样可以完成类似的工作 —— Core Dump。

$ ulimit -acore file size       (blocks, -c) 0data seg size        (kbytes, -d) unlimitedscheduling priority          (-e) 20file size            (blocks, -f) unlimitedpending signals              (-i) 16382max locked memory    (kbytes, -l) 64max memory size      (kbytes, -m) unlimitedopen files                   (-n) 1024pipe size         (512 bytes, -p) 8POSIX message queues  (bytes, -q) 819200real-time priority           (-r) 0stack size           (kbytes, -s) 8192cpu time            (seconds, -t) unlimitedmax user processes           (-u) unlimitedvirtual memory       (kbytes, -v) unlimitedfile locks                   (-x) unlimited

$ sudo  sh -c "ulimit -c unlimited; ./test" # test 是可执行文件名。

#include #include void test(){    char* s = "abc";    *s = 'x';}int main(int argc, char** argv){    test();    return (EXIT_SUCCESS);}

$ sudo sh -c "ulimit -c unlimited; ./test"Segmentation fault (core dumped)

$ ls -ltotal 96-rw------- 1 root  root  167936 2010-01-06 13:30 core-rwxr-xr-x 1 yuhen yuhen   9166 2010-01-06 13:16 test

$ sudo gdb test coreGNU gdb (GDB) 7.0-ubuntuCopyright (C) 2009 Free Software Foundation, Inc.Reading symbols from .../dist/Debug/test...done.warning: Can't read pathname for load map: Input/output error.Reading symbols from /lib/tls/i686/cmov/libpthread.so.0... ...done.(no debugging symbols found)...done.Loaded symbols for /lib/tls/i686/cmov/libpthread.so.0Reading symbols from /lib/tls/i686/cmov/libc.so.6... ...done.(no debugging symbols found)...done.Loaded symbols for /lib/tls/i686/cmov/libc.so.6Reading symbols from /lib/ld-linux.so.2... ...done.(no debugging symbols found)...done.Loaded symbols for /lib/ld-linux.so.2Core was generated by `./test'.Program terminated with signal 11, Segmentation fault.#0  0x080483f4 in test () at main.c:16warning: Source file is more recent than executable.16        *s = 'x';

(gdb) where#0  0x080483f4 in test () at main.c:16#1  0x08048401 in main (argc=1, argv=0xbfd53e44) at main.c:22

(gdb) p s$1 = 0x80484d0 "abc"

(gdb) info filesSymbols from ".../dist/Debug/test".Local core dump file:Local exec file:    `.../dist/Debug/test', file type elf32-i386.    Entry point: 0x8048330    0x08048134 - 0x08048147 is .interp    ... ...    0x08048330 - 0x080484ac is .text    0x080484ac - 0x080484c8 is .fini    0x080484c8 - 0x080484d4 is .rodata