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# 加载可执行程序和core dump文件 ## 例子 #include <stdio.h> int main(void) { int *p = NULL; printf("hello world\n"); *p = 0; return 0; } ## 技巧 例子程序访问了一个空指针,所以程序会crash并产生core dump文件。用gdb调试core dump文件,通常用这个命令形式:“gdb path/to/the/executable path/to/the/coredump”,然后gdb会显示程序crash的位置: bash-3.2# gdb -q /data/nan/a /var/core/core.a.22268.1402638140 Reading symbols from /data/nan/a...done. [New LWP 1] [Thread debugging using libthread_db enabled] [New Thread 1 (LWP 1)] Core was generated by `./a'. Program terminated with signal 11, Segmentation fault. #0 0x0000000000400cdb in main () at a.c:6 6 *p = 0; 有时我们想在gdb启动后,动态加载可执行程序和core dump文件,这时可以用“file”和“core”(core-file命令缩写)命令。“file”命令用来读取可执行文件的符号表信息,而“core”命令则是指定core dump文件的位置: bash-3.2# gdb -q (gdb) file /data/nan/a Reading symbols from /data/nan/a...done. (gdb) core /var/core/core.a.22268.1402638140 [New LWP 1] [Thread debugging using libthread_db enabled] [New Thread 1 (LWP 1)] Core was generated by `./a'. Program terminated with signal 11, Segmentation fault. #0 0x0000000000400cdb in main () at a.c:6 6 *p = 0; 可以看到gdb同样显示程序crash的位置。 这两个命令可参见[gdb手册](https://sourceware.org/gdb/onlinedocs/gdb/Files.html#index-core-dump-file) ## 贡献者 nanxiao