linux 打印堆栈方法

1. linux内核堆栈打印方法

在需要打印堆栈的函数内部加入函数dump_stack()或 __backtrace();

例：在下面gsmld_open(...)函数内部加入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);
}

堆栈信息：

Backtrace: 
[] (dump_backtrace+0x0/0x10c) from [] (show_stack+0x18/0x1c)
 r7:c2c9b0c0 r6:c2ca8a00 r5:c2c9b060 r4:c2ca8a00
[] (show_stack+0x0/0x1c) from [] (dump_stack+0x20/0x2c)
[] (dump_stack+0x0/0x2c) from [] (gsmld_open+0x1c/0x130 [n_gsm])
[] (gsmld_open+0x0/0x130 [n_gsm]) from [] (tty_ldisc_open+0x54/0x94)
 r9:c2ca8a18 r8:c2c9b060 r7:c2c9b0c0 r6:c2ca8a00 r5:c2c9b060
r4:c2ca8a00
[] (tty_ldisc_open+0x0/0x94) from [] (tty_set_ldisc+0x1b8/0x7d0)
 r5:00000000 r4:c2ca8af0
[] (tty_set_ldisc+0x0/0x7d0) from [] (tty_ioctl+0x56c/0xcb0)
[] (tty_ioctl+0x0/0xcb0) from [] (do_vfs_ioctl+0x88/0x638)
[] (do_vfs_ioctl+0x0/0x638) from [] (SyS_ioctl+0x44/0x68)
[] (SyS_ioctl+0x0/0x68) from [] (ret_fast_syscall+0x0/0x2c)
 r8:c000f948 r7:00000036 r6:00000000 r5:00001002 r4:b6e32510

2. linux应用层堆栈打印方法

在需要打印堆栈的函数内部加入函数backtrace(...)、backtrace_symbols(...):

 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]);