我正在尝试以gdb非交互方式使用 - 即在每个指定的断点上打印一些东西。
$ cat script.gdb
set pagination off
catch syscall
commands
bt
c
end
# It's a hack to get backtraces only on call not on return - Linux and x86_64 specific.
# For sake of this question it can be removed, it will just output more.
condition $bpnum $rax == -38
问题 - 使用批处理模式进行非交互式尝试：
$ gdb /bin/true -batch -x script.gdb
Catchpoint 1 (any syscall)
Catchpoint 2 (syscall 'fork' [57])
Catchpoint 1 (call to syscall brk), 0x00007ffff7df2f9c in brk () from /lib64/ld-linux-x86-64.so.2
但是，如果我以交互方式运行它：
$ gdb /bin/true -x script.gdb
GNU gdb (GDB) 8.1
...
Reading symbols from /bin/true...
(no debugging symbols found)...done.
Catchpoint 1 (any syscall)
Catchpoint 2 (syscall 'fork' [57])
(gdb) run
Starting program: /usr/bin/true
Catchpoint 1 (call to syscall brk), 0x00007ffff7df2f9c in brk () from /lib64/ld-linux-x86-64.so.2
#0 0x00007ffff7df2f9c in brk () from /lib64/ld-linux-x86-64.so.2
#1 0x00007ffff7df2488 in _dl_sysdep_start () from /lib64/ld-linux-x86-64.so.2
#2 0x00007ffff7ddcbc1 in _dl_start () from /lib64/ld-linux-x86-64.so.2
#3 0x00007ffff7ddc178 in _start () from /lib64/ld-linux-x86-64.so.2
#4 0x0000000000000001 in ?? ()
#5 0x00007fffffffe2a5 in ?? ()
#6 0x0000000000000000 in ?? ()
...
Catchpoint 1 (call to syscall exit_group), 0x00007ffff7ad7529 in _exit () from /lib64/libc.so.6
#0 0x00007ffff7ad7529 in _exit () from /lib64/libc.so.6
#1 0x00007ffff7a50a2b in __run_exit_handlers () from /lib64/libc.so.6
#2 0x00007ffff7a50ab5 in exit () from /lib64/libc.so.6
#3 0x000000000040132d in ?? ()
#4 0x00007ffff7a39c05 in __libc_start_main () from /lib64/libc.so.6
#5 0x0000000000401406 in ?? ()
[Inferior 1 (process 35434) exited normally]
(gdb) quit
然后它按预期工作 - 执行断点命令。
向非交互式命令添加附加-ex c内容只会添加另一行Catchpoint 1 ...，但仍然没有回溯。
手册页和使用 GDB 调试没有帮助。
我想必须有一些命令会等到它结束，或者可能是某个类似的设置pagination。
我知道我可以使用类似于expect脚本的东西，但我想避免它。像这样的工作：
echo 'run
quit' | gdb /bin/true -x script.gdb