[40645 inferior]: GDB task: 0x203, pid: 40645
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Reading symbols from /Users/siweihe/Developer/ECE496/a.out...
Reading symbols from /Users/siweihe/Developer/ECE496/a.out.dSYM/Contents/Resources/DWARF/a.out...
(gdb) b main
Breakpoint 1 at 0x100003f9d: file test.c, line 2.
(gdb) r
Starting program: /Users/siweihe/Developer/ECE496/a.out 
[40645 inferior]: inferior task: 0x1103, pid: 40718
[40645 inferior]:  new_ix:0/1, old_ix:0/0, new_id:0x1503 old_id:0x0
[New Thread 0x1503 of process 40718]
[40645 inferior]: darwin_wait: waiting for a message ptid=40718.0.0
[40718 inferior]: ptrace (PT_TRACE_ME, 0, 0x0, 0): 0 (no error)
[40718 inferior]: ptrace (PT_SIGEXC, 0, 0x0, 0): 0 (no error)
message header:
 bits: 0x1200
 size: 0x24
 remote-port: 0x0
 local-port: 0xe03
 reserved: 0x0
 id: 0x48
  data: 00000000 00000001 00001103
[46836 inferior]: WIFSTOPPED
[40645 inferior]: darwin_wait: pid=40718 exit, status=0x57f