为调试进程产生core dump文件

技巧

在用gdb调试程序时，我们有时想让被调试的进程产生core dump文件，记录现在进程的状态，以供以后分析。可以用“generate-core-file”命令来产生core dump文件：

(gdb) help generate-core-file
Save a core file with the current state of the debugged process.
Argument is optional filename.  Default filename is 'core.<process_id>'.

(gdb) start
Temporary breakpoint 1 at 0x8050c12: file a.c, line 9.
Starting program: /data1/nan/a
[Thread debugging using libthread_db enabled]
[New Thread 1 (LWP 1)]
[Switching to Thread 1 (LWP 1)]

Temporary breakpoint 1, main () at a.c:9
9           change_var();
(gdb) generate-core-file
Saved corefile core.12955

也可使用“gcore”命令：

(gdb) help gcore
Save a core file with the current state of the debugged process.
Argument is optional filename.  Default filename is 'core.<process_id>'.
(gdb) gcore
Saved corefile core.13256

参见gdb手册

贡献者

nanxiao