![Masami Hiramatsu](/assets/img/avatar_default.png)
In Documentation/trace/kprobetrace.txt, it says @SYM[+|-offs] : Fetch memory at SYM +|- offs (SYM should be a data symbol) However, the parser doesn't parse minus offset correctly, since commit2fba0c8867
("tracing/kprobes: Fix probe offset to be unsigned") drops minus ("-") offset support for kprobe probe address usage. This fixes the traceprobe_split_symbol_offset() to parse minus offset again with checking the offset range, and add a minus offset check in kprobe probe address usage. Link: http://lkml.kernel.org/r/152129028983.31874.13419301530285775521.stgit@devbox Cc: Ingo Molnar <mingo@redhat.com> Cc: Tom Zanussi <tom.zanussi@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Cc: stable@vger.kernel.org Fixes:2fba0c8867
("tracing/kprobes: Fix probe offset to be unsigned") Acked-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
685 lines
17 KiB
C
685 lines
17 KiB
C
/*
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* Common code for probe-based Dynamic events.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This code was copied from kernel/trace/trace_kprobe.c written by
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* Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
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*
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* Updates to make this generic:
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* Copyright (C) IBM Corporation, 2010-2011
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* Author: Srikar Dronamraju
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*/
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#define pr_fmt(fmt) "trace_probe: " fmt
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#include "trace_probe.h"
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const char *reserved_field_names[] = {
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"common_type",
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"common_flags",
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"common_preempt_count",
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"common_pid",
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"common_tgid",
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FIELD_STRING_IP,
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FIELD_STRING_RETIP,
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FIELD_STRING_FUNC,
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};
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/* Printing in basic type function template */
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#define DEFINE_BASIC_PRINT_TYPE_FUNC(tname, type, fmt) \
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int PRINT_TYPE_FUNC_NAME(tname)(struct trace_seq *s, const char *name, \
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void *data, void *ent) \
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{ \
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trace_seq_printf(s, " %s=" fmt, name, *(type *)data); \
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return !trace_seq_has_overflowed(s); \
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} \
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const char PRINT_TYPE_FMT_NAME(tname)[] = fmt; \
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NOKPROBE_SYMBOL(PRINT_TYPE_FUNC_NAME(tname));
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DEFINE_BASIC_PRINT_TYPE_FUNC(u8, u8, "%u")
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DEFINE_BASIC_PRINT_TYPE_FUNC(u16, u16, "%u")
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DEFINE_BASIC_PRINT_TYPE_FUNC(u32, u32, "%u")
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DEFINE_BASIC_PRINT_TYPE_FUNC(u64, u64, "%Lu")
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DEFINE_BASIC_PRINT_TYPE_FUNC(s8, s8, "%d")
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DEFINE_BASIC_PRINT_TYPE_FUNC(s16, s16, "%d")
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DEFINE_BASIC_PRINT_TYPE_FUNC(s32, s32, "%d")
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DEFINE_BASIC_PRINT_TYPE_FUNC(s64, s64, "%Ld")
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DEFINE_BASIC_PRINT_TYPE_FUNC(x8, u8, "0x%x")
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DEFINE_BASIC_PRINT_TYPE_FUNC(x16, u16, "0x%x")
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DEFINE_BASIC_PRINT_TYPE_FUNC(x32, u32, "0x%x")
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DEFINE_BASIC_PRINT_TYPE_FUNC(x64, u64, "0x%Lx")
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/* Print type function for string type */
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int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s, const char *name,
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void *data, void *ent)
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{
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int len = *(u32 *)data >> 16;
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if (!len)
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trace_seq_printf(s, " %s=(fault)", name);
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else
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trace_seq_printf(s, " %s=\"%s\"", name,
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(const char *)get_loc_data(data, ent));
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return !trace_seq_has_overflowed(s);
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}
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NOKPROBE_SYMBOL(PRINT_TYPE_FUNC_NAME(string));
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const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
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#define CHECK_FETCH_FUNCS(method, fn) \
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(((FETCH_FUNC_NAME(method, u8) == fn) || \
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(FETCH_FUNC_NAME(method, u16) == fn) || \
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(FETCH_FUNC_NAME(method, u32) == fn) || \
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(FETCH_FUNC_NAME(method, u64) == fn) || \
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(FETCH_FUNC_NAME(method, string) == fn) || \
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(FETCH_FUNC_NAME(method, string_size) == fn)) \
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&& (fn != NULL))
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/* Data fetch function templates */
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#define DEFINE_FETCH_reg(type) \
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void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, void *offset, void *dest) \
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{ \
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*(type *)dest = (type)regs_get_register(regs, \
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(unsigned int)((unsigned long)offset)); \
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(reg, type));
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DEFINE_BASIC_FETCH_FUNCS(reg)
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/* No string on the register */
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#define fetch_reg_string NULL
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#define fetch_reg_string_size NULL
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#define DEFINE_FETCH_retval(type) \
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void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs, \
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void *dummy, void *dest) \
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{ \
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*(type *)dest = (type)regs_return_value(regs); \
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(retval, type));
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DEFINE_BASIC_FETCH_FUNCS(retval)
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/* No string on the retval */
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#define fetch_retval_string NULL
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#define fetch_retval_string_size NULL
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/* Dereference memory access function */
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struct deref_fetch_param {
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struct fetch_param orig;
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long offset;
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fetch_func_t fetch;
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fetch_func_t fetch_size;
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};
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#define DEFINE_FETCH_deref(type) \
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void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \
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void *data, void *dest) \
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{ \
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struct deref_fetch_param *dprm = data; \
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unsigned long addr; \
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call_fetch(&dprm->orig, regs, &addr); \
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if (addr) { \
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addr += dprm->offset; \
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dprm->fetch(regs, (void *)addr, dest); \
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} else \
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*(type *)dest = 0; \
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(deref, type));
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DEFINE_BASIC_FETCH_FUNCS(deref)
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DEFINE_FETCH_deref(string)
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void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs,
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void *data, void *dest)
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{
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struct deref_fetch_param *dprm = data;
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unsigned long addr;
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call_fetch(&dprm->orig, regs, &addr);
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if (addr && dprm->fetch_size) {
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addr += dprm->offset;
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dprm->fetch_size(regs, (void *)addr, dest);
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} else
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*(string_size *)dest = 0;
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}
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(deref, string_size));
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static void update_deref_fetch_param(struct deref_fetch_param *data)
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{
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if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
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update_deref_fetch_param(data->orig.data);
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else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
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update_symbol_cache(data->orig.data);
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}
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NOKPROBE_SYMBOL(update_deref_fetch_param);
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static void free_deref_fetch_param(struct deref_fetch_param *data)
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{
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if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
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free_deref_fetch_param(data->orig.data);
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else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
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free_symbol_cache(data->orig.data);
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kfree(data);
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}
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NOKPROBE_SYMBOL(free_deref_fetch_param);
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/* Bitfield fetch function */
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struct bitfield_fetch_param {
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struct fetch_param orig;
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unsigned char hi_shift;
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unsigned char low_shift;
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};
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#define DEFINE_FETCH_bitfield(type) \
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void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs, \
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void *data, void *dest) \
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{ \
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struct bitfield_fetch_param *bprm = data; \
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type buf = 0; \
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call_fetch(&bprm->orig, regs, &buf); \
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if (buf) { \
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buf <<= bprm->hi_shift; \
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buf >>= bprm->low_shift; \
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} \
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*(type *)dest = buf; \
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} \
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(bitfield, type));
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DEFINE_BASIC_FETCH_FUNCS(bitfield)
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#define fetch_bitfield_string NULL
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#define fetch_bitfield_string_size NULL
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static void
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update_bitfield_fetch_param(struct bitfield_fetch_param *data)
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{
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/*
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* Don't check the bitfield itself, because this must be the
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* last fetch function.
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*/
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if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
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update_deref_fetch_param(data->orig.data);
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else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
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update_symbol_cache(data->orig.data);
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}
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static void
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free_bitfield_fetch_param(struct bitfield_fetch_param *data)
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{
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/*
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* Don't check the bitfield itself, because this must be the
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* last fetch function.
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*/
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if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
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free_deref_fetch_param(data->orig.data);
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else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
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free_symbol_cache(data->orig.data);
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kfree(data);
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}
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void FETCH_FUNC_NAME(comm, string)(struct pt_regs *regs,
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void *data, void *dest)
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{
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int maxlen = get_rloc_len(*(u32 *)dest);
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u8 *dst = get_rloc_data(dest);
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long ret;
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if (!maxlen)
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return;
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ret = strlcpy(dst, current->comm, maxlen);
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*(u32 *)dest = make_data_rloc(ret, get_rloc_offs(*(u32 *)dest));
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}
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(comm, string));
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void FETCH_FUNC_NAME(comm, string_size)(struct pt_regs *regs,
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void *data, void *dest)
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{
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*(u32 *)dest = strlen(current->comm) + 1;
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}
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NOKPROBE_SYMBOL(FETCH_FUNC_NAME(comm, string_size));
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static const struct fetch_type *find_fetch_type(const char *type,
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const struct fetch_type *ftbl)
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{
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int i;
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if (!type)
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type = DEFAULT_FETCH_TYPE_STR;
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/* Special case: bitfield */
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if (*type == 'b') {
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unsigned long bs;
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type = strchr(type, '/');
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if (!type)
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goto fail;
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type++;
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if (kstrtoul(type, 0, &bs))
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goto fail;
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switch (bs) {
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case 8:
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return find_fetch_type("u8", ftbl);
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case 16:
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return find_fetch_type("u16", ftbl);
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case 32:
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return find_fetch_type("u32", ftbl);
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case 64:
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return find_fetch_type("u64", ftbl);
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default:
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goto fail;
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}
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}
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for (i = 0; ftbl[i].name; i++) {
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if (strcmp(type, ftbl[i].name) == 0)
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return &ftbl[i];
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}
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fail:
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return NULL;
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}
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/* Special function : only accept unsigned long */
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static void fetch_kernel_stack_address(struct pt_regs *regs, void *dummy, void *dest)
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{
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*(unsigned long *)dest = kernel_stack_pointer(regs);
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}
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NOKPROBE_SYMBOL(fetch_kernel_stack_address);
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static void fetch_user_stack_address(struct pt_regs *regs, void *dummy, void *dest)
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{
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*(unsigned long *)dest = user_stack_pointer(regs);
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}
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NOKPROBE_SYMBOL(fetch_user_stack_address);
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static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
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fetch_func_t orig_fn,
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const struct fetch_type *ftbl)
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{
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int i;
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if (type != &ftbl[FETCH_TYPE_STRING])
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return NULL; /* Only string type needs size function */
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for (i = 0; i < FETCH_MTD_END; i++)
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if (type->fetch[i] == orig_fn)
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return ftbl[FETCH_TYPE_STRSIZE].fetch[i];
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WARN_ON(1); /* This should not happen */
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return NULL;
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}
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/* Split symbol and offset. */
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int traceprobe_split_symbol_offset(char *symbol, long *offset)
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{
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char *tmp;
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int ret;
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if (!offset)
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return -EINVAL;
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tmp = strpbrk(symbol, "+-");
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if (tmp) {
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ret = kstrtol(tmp, 0, offset);
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if (ret)
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return ret;
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*tmp = '\0';
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} else
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*offset = 0;
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return 0;
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}
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#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
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static int parse_probe_vars(char *arg, const struct fetch_type *t,
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struct fetch_param *f, bool is_return,
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bool is_kprobe)
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{
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int ret = 0;
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unsigned long param;
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if (strcmp(arg, "retval") == 0) {
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if (is_return)
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f->fn = t->fetch[FETCH_MTD_retval];
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else
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ret = -EINVAL;
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} else if (strncmp(arg, "stack", 5) == 0) {
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if (arg[5] == '\0') {
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if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR))
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return -EINVAL;
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if (is_kprobe)
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f->fn = fetch_kernel_stack_address;
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else
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f->fn = fetch_user_stack_address;
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} else if (isdigit(arg[5])) {
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ret = kstrtoul(arg + 5, 10, ¶m);
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if (ret || (is_kprobe && param > PARAM_MAX_STACK))
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ret = -EINVAL;
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else {
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f->fn = t->fetch[FETCH_MTD_stack];
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f->data = (void *)param;
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}
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} else
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ret = -EINVAL;
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} else if (strcmp(arg, "comm") == 0) {
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if (strcmp(t->name, "string") != 0 &&
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strcmp(t->name, "string_size") != 0)
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return -EINVAL;
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f->fn = t->fetch[FETCH_MTD_comm];
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} else
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ret = -EINVAL;
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return ret;
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}
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/* Recursive argument parser */
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static int parse_probe_arg(char *arg, const struct fetch_type *t,
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struct fetch_param *f, bool is_return, bool is_kprobe,
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const struct fetch_type *ftbl)
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{
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unsigned long param;
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long offset;
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char *tmp;
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int ret = 0;
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switch (arg[0]) {
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case '$':
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ret = parse_probe_vars(arg + 1, t, f, is_return, is_kprobe);
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break;
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case '%': /* named register */
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ret = regs_query_register_offset(arg + 1);
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if (ret >= 0) {
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f->fn = t->fetch[FETCH_MTD_reg];
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f->data = (void *)(unsigned long)ret;
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ret = 0;
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}
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break;
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case '@': /* memory, file-offset or symbol */
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if (isdigit(arg[1])) {
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ret = kstrtoul(arg + 1, 0, ¶m);
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if (ret)
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break;
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f->fn = t->fetch[FETCH_MTD_memory];
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f->data = (void *)param;
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} else if (arg[1] == '+') {
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/* kprobes don't support file offsets */
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if (is_kprobe)
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return -EINVAL;
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ret = kstrtol(arg + 2, 0, &offset);
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if (ret)
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break;
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f->fn = t->fetch[FETCH_MTD_file_offset];
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f->data = (void *)offset;
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} else {
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/* uprobes don't support symbols */
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if (!is_kprobe)
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return -EINVAL;
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ret = traceprobe_split_symbol_offset(arg + 1, &offset);
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if (ret)
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break;
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f->data = alloc_symbol_cache(arg + 1, offset);
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if (f->data)
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f->fn = t->fetch[FETCH_MTD_symbol];
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}
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break;
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case '+': /* deref memory */
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arg++; /* Skip '+', because kstrtol() rejects it. */
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case '-':
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tmp = strchr(arg, '(');
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if (!tmp)
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break;
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*tmp = '\0';
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ret = kstrtol(arg, 0, &offset);
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if (ret)
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break;
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arg = tmp + 1;
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tmp = strrchr(arg, ')');
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if (tmp) {
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struct deref_fetch_param *dprm;
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const struct fetch_type *t2;
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t2 = find_fetch_type(NULL, ftbl);
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*tmp = '\0';
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dprm = kzalloc(sizeof(struct deref_fetch_param), GFP_KERNEL);
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if (!dprm)
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return -ENOMEM;
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dprm->offset = offset;
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dprm->fetch = t->fetch[FETCH_MTD_memory];
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dprm->fetch_size = get_fetch_size_function(t,
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dprm->fetch, ftbl);
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ret = parse_probe_arg(arg, t2, &dprm->orig, is_return,
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is_kprobe, ftbl);
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if (ret)
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kfree(dprm);
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else {
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f->fn = t->fetch[FETCH_MTD_deref];
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f->data = (void *)dprm;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
if (!ret && !f->fn) { /* Parsed, but do not find fetch method */
|
|
pr_info("%s type has no corresponding fetch method.\n", t->name);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define BYTES_TO_BITS(nb) ((BITS_PER_LONG * (nb)) / sizeof(long))
|
|
|
|
/* Bitfield type needs to be parsed into a fetch function */
|
|
static int __parse_bitfield_probe_arg(const char *bf,
|
|
const struct fetch_type *t,
|
|
struct fetch_param *f)
|
|
{
|
|
struct bitfield_fetch_param *bprm;
|
|
unsigned long bw, bo;
|
|
char *tail;
|
|
|
|
if (*bf != 'b')
|
|
return 0;
|
|
|
|
bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
|
|
if (!bprm)
|
|
return -ENOMEM;
|
|
|
|
bprm->orig = *f;
|
|
f->fn = t->fetch[FETCH_MTD_bitfield];
|
|
f->data = (void *)bprm;
|
|
bw = simple_strtoul(bf + 1, &tail, 0); /* Use simple one */
|
|
|
|
if (bw == 0 || *tail != '@')
|
|
return -EINVAL;
|
|
|
|
bf = tail + 1;
|
|
bo = simple_strtoul(bf, &tail, 0);
|
|
|
|
if (tail == bf || *tail != '/')
|
|
return -EINVAL;
|
|
|
|
bprm->hi_shift = BYTES_TO_BITS(t->size) - (bw + bo);
|
|
bprm->low_shift = bprm->hi_shift + bo;
|
|
|
|
return (BYTES_TO_BITS(t->size) < (bw + bo)) ? -EINVAL : 0;
|
|
}
|
|
|
|
/* String length checking wrapper */
|
|
int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
|
|
struct probe_arg *parg, bool is_return, bool is_kprobe,
|
|
const struct fetch_type *ftbl)
|
|
{
|
|
const char *t;
|
|
int ret;
|
|
|
|
if (strlen(arg) > MAX_ARGSTR_LEN) {
|
|
pr_info("Argument is too long.: %s\n", arg);
|
|
return -ENOSPC;
|
|
}
|
|
parg->comm = kstrdup(arg, GFP_KERNEL);
|
|
if (!parg->comm) {
|
|
pr_info("Failed to allocate memory for command '%s'.\n", arg);
|
|
return -ENOMEM;
|
|
}
|
|
t = strchr(parg->comm, ':');
|
|
if (t) {
|
|
arg[t - parg->comm] = '\0';
|
|
t++;
|
|
}
|
|
/*
|
|
* The default type of $comm should be "string", and it can't be
|
|
* dereferenced.
|
|
*/
|
|
if (!t && strcmp(arg, "$comm") == 0)
|
|
t = "string";
|
|
parg->type = find_fetch_type(t, ftbl);
|
|
if (!parg->type) {
|
|
pr_info("Unsupported type: %s\n", t);
|
|
return -EINVAL;
|
|
}
|
|
parg->offset = *size;
|
|
*size += parg->type->size;
|
|
ret = parse_probe_arg(arg, parg->type, &parg->fetch, is_return,
|
|
is_kprobe, ftbl);
|
|
|
|
if (ret >= 0 && t != NULL)
|
|
ret = __parse_bitfield_probe_arg(t, parg->type, &parg->fetch);
|
|
|
|
if (ret >= 0) {
|
|
parg->fetch_size.fn = get_fetch_size_function(parg->type,
|
|
parg->fetch.fn,
|
|
ftbl);
|
|
parg->fetch_size.data = parg->fetch.data;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Return 1 if name is reserved or already used by another argument */
|
|
int traceprobe_conflict_field_name(const char *name,
|
|
struct probe_arg *args, int narg)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++)
|
|
if (strcmp(reserved_field_names[i], name) == 0)
|
|
return 1;
|
|
|
|
for (i = 0; i < narg; i++)
|
|
if (strcmp(args[i].name, name) == 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void traceprobe_update_arg(struct probe_arg *arg)
|
|
{
|
|
if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
|
|
update_bitfield_fetch_param(arg->fetch.data);
|
|
else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
|
|
update_deref_fetch_param(arg->fetch.data);
|
|
else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
|
|
update_symbol_cache(arg->fetch.data);
|
|
}
|
|
|
|
void traceprobe_free_probe_arg(struct probe_arg *arg)
|
|
{
|
|
if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
|
|
free_bitfield_fetch_param(arg->fetch.data);
|
|
else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
|
|
free_deref_fetch_param(arg->fetch.data);
|
|
else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
|
|
free_symbol_cache(arg->fetch.data);
|
|
|
|
kfree(arg->name);
|
|
kfree(arg->comm);
|
|
}
|
|
|
|
static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
|
|
bool is_return)
|
|
{
|
|
int i;
|
|
int pos = 0;
|
|
|
|
const char *fmt, *arg;
|
|
|
|
if (!is_return) {
|
|
fmt = "(%lx)";
|
|
arg = "REC->" FIELD_STRING_IP;
|
|
} else {
|
|
fmt = "(%lx <- %lx)";
|
|
arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
|
|
}
|
|
|
|
/* When len=0, we just calculate the needed length */
|
|
#define LEN_OR_ZERO (len ? len - pos : 0)
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
|
|
|
|
for (i = 0; i < tp->nr_args; i++) {
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
|
|
tp->args[i].name, tp->args[i].type->fmt);
|
|
}
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
|
|
|
|
for (i = 0; i < tp->nr_args; i++) {
|
|
if (strcmp(tp->args[i].type->name, "string") == 0)
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO,
|
|
", __get_str(%s)",
|
|
tp->args[i].name);
|
|
else
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
|
|
tp->args[i].name);
|
|
}
|
|
|
|
#undef LEN_OR_ZERO
|
|
|
|
/* return the length of print_fmt */
|
|
return pos;
|
|
}
|
|
|
|
int set_print_fmt(struct trace_probe *tp, bool is_return)
|
|
{
|
|
int len;
|
|
char *print_fmt;
|
|
|
|
/* First: called with 0 length to calculate the needed length */
|
|
len = __set_print_fmt(tp, NULL, 0, is_return);
|
|
print_fmt = kmalloc(len + 1, GFP_KERNEL);
|
|
if (!print_fmt)
|
|
return -ENOMEM;
|
|
|
|
/* Second: actually write the @print_fmt */
|
|
__set_print_fmt(tp, print_fmt, len + 1, is_return);
|
|
tp->call.print_fmt = print_fmt;
|
|
|
|
return 0;
|
|
}
|