如果没有调试符号，我怎么能在OS X（10.6）的程序开始时中断？
我正在调试我的机器挂起但无法做某些事情的问题（至少涉及网络的任何事情）。我可以用来尝试识别挂起的程序也会在启动时挂起，所以我想启动一个程序，但实际上并没有运行它直到发生挂起，希望程序运行或它挂起的地方帮助我诊断问题。
我尝试在回溯中显示的地址设置断点，但执行没有停止。
Breakpoint 2, 0x000000010005cc78 in write$NOCANCEL ()
(gdb) bt
#0 0x000000010005cc78 in write$NOCANCEL ()
#1 0x000000010005cc74 in __swrite ()
#2 0x000000010005cbfd in _swrite ()
#3 0x000000010005cb42 in __sflush ()
#4 0x0000000100061361 in __swbuf ()
#5 0x0000000100093474 in putchar ()
#6 0x0000000100003ce7 in ?? ()
#7 0x000000010000090c in ?? ()
(gdb) b *0x000000010000090c
Breakpoint 3 at 0x10000090c
(gdb) b *0x0000000100003ce7
Breakpoint 4 at 0x100003ce7
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: [...]
Breakpoint 2, 0x000000010005cc78 in write$NOCANCEL ()
(gdb) bt
#0 0x000000010005cc78 in write$NOCANCEL ()
#1 0x000000010005cc74 in __swrite ()
#2 0x000000010005cbfd in _swrite ()
#3 0x000000010005cb42 in __sflush ()
#4 0x0000000100061361 in __swbuf ()
#5 0x0000000100093474 in putchar ()
#6 0x0000000100003ce7 in ?? ()
#7 0x000000010000090c in ?? ()