# 加載可執行程序和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 例子程序訪問了一個空指針，所以程序會crash并產生core dump文件。用gdb調試core dump文件，通常用這個命令形式：“gdb path/to/the/executable path/to/the/coredump”，然后gdb會顯示程序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; 有時我們想在gdb啟動后，動態加載可執行程序和core dump文件，這時可以用“file”和“core”（core-file命令縮寫）命令。“file”命令用來讀取可執行文件的符號表信息，而“core”命令則是指定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同樣顯示程序crash的位置。 這兩個命令可參見[gdb手冊](https://sourceware.org/gdb/onlinedocs/gdb/Files.html#index-core-dump-file) ## 貢獻者 nanxiao