linux 列印堆棧方法

1. linux核心堆棧列印方法

在需要列印堆棧的函數内部加入函數dump_stack()或 __backtrace();

例：在下面gsmld_open(...)函數内部加入dump_stack():

static int gsmld_open(struct tty_struct *tty)
{
  struct gsm_mux *gsm;

  dump_stack();
  
  if (tty->ops->write == NULL)
    return -EINVAL;

  /* Attach our ldisc data */
  gsm = gsm_alloc_mux();
  if (gsm == NULL)
    return -ENOMEM;

  tty->disc_data = gsm;
  tty->receive_room = 65536;

  /* Attach the initial passive connection */
  gsm->encoding = 1;
  return gsmld_attach_gsm(tty, gsm);
}      

堆棧資訊：

Backtrace: 
[<c0012df8>] (dump_backtrace+0x0/0x10c) from [<c0012f1c>] (show_stack+0x18/0x1c)
 r7:c2c9b0c0 r6:c2ca8a00 r5:c2c9b060 r4:c2ca8a00
[<c0012f04>] (show_stack+0x0/0x1c) from [<c030df3c>] (dump_stack+0x20/0x2c)
[<c030df1c>] (dump_stack+0x0/0x2c) from [<bf00e420>] (gsmld_open+0x1c/0x130 [n_gsm])
[<bf00e404>] (gsmld_open+0x0/0x130 [n_gsm]) from [<c01d7228>] (tty_ldisc_open+0x54/0x94)
 r9:c2ca8a18 r8:c2c9b060 r7:c2c9b0c0 r6:c2ca8a00 r5:c2c9b060
r4:c2ca8a00
[<c01d71d4>] (tty_ldisc_open+0x0/0x94) from [<c01d7fc0>] (tty_set_ldisc+0x1b8/0x7d0)
 r5:00000000 r4:c2ca8af0
[<c01d7e08>] (tty_set_ldisc+0x0/0x7d0) from [<c01d1038>] (tty_ioctl+0x56c/0xcb0)
[<c01d0acc>] (tty_ioctl+0x0/0xcb0) from [<c00d631c>] (do_vfs_ioctl+0x88/0x638)
[<c00d6294>] (do_vfs_ioctl+0x0/0x638) from [<c00d6910>] (SyS_ioctl+0x44/0x68)
[<c00d68cc>] (SyS_ioctl+0x0/0x68) from [<c000f7c0>] (ret_fast_syscall+0x0/0x2c)
 r8:c000f948 r7:00000036 r6:00000000 r5:00001002 r4:b6e32510      

2. linux應用層堆棧列印方法

void *bt[20]; 
 char **strings; 
 size_t sz;
 sz = backtrace(bt, 20); 
 strings = backtrace_symbols(bt, sz); 
    for(i = 0; i < sz; ++i) 
        fprintf(stderr, "%s/n", strings[i]);