739 lines
20 KiB
C
739 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "util/debug.h"
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#include "util/dso.h"
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#include "util/event.h"
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#include "util/map.h"
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#include "util/symbol.h"
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#include "util/sort.h"
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#include "util/evsel.h"
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#include "util/evlist.h"
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#include "util/machine.h"
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#include "util/thread.h"
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#include "util/parse-events.h"
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#include "tests/tests.h"
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#include "tests/hists_common.h"
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#include <linux/kernel.h>
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struct sample {
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u32 pid;
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u64 ip;
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struct thread *thread;
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struct map *map;
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struct symbol *sym;
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};
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/* For the numbers, see hists_common.c */
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static struct sample fake_samples[] = {
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/* perf [kernel] schedule() */
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{ .pid = FAKE_PID_PERF1, .ip = FAKE_IP_KERNEL_SCHEDULE, },
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/* perf [perf] main() */
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{ .pid = FAKE_PID_PERF1, .ip = FAKE_IP_PERF_MAIN, },
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/* perf [perf] cmd_record() */
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{ .pid = FAKE_PID_PERF1, .ip = FAKE_IP_PERF_CMD_RECORD, },
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/* perf [libc] malloc() */
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{ .pid = FAKE_PID_PERF1, .ip = FAKE_IP_LIBC_MALLOC, },
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/* perf [libc] free() */
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{ .pid = FAKE_PID_PERF1, .ip = FAKE_IP_LIBC_FREE, },
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/* perf [perf] main() */
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{ .pid = FAKE_PID_PERF2, .ip = FAKE_IP_PERF_MAIN, },
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/* perf [kernel] page_fault() */
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{ .pid = FAKE_PID_PERF2, .ip = FAKE_IP_KERNEL_PAGE_FAULT, },
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/* bash [bash] main() */
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{ .pid = FAKE_PID_BASH, .ip = FAKE_IP_BASH_MAIN, },
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/* bash [bash] xmalloc() */
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{ .pid = FAKE_PID_BASH, .ip = FAKE_IP_BASH_XMALLOC, },
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/* bash [kernel] page_fault() */
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{ .pid = FAKE_PID_BASH, .ip = FAKE_IP_KERNEL_PAGE_FAULT, },
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};
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/*
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* Will be casted to struct ip_callchain which has all 64 bit entries
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* of nr and ips[].
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*/
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static u64 fake_callchains[][10] = {
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/* schedule => run_command => main */
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{ 3, FAKE_IP_KERNEL_SCHEDULE, FAKE_IP_PERF_RUN_COMMAND, FAKE_IP_PERF_MAIN, },
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/* main */
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{ 1, FAKE_IP_PERF_MAIN, },
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/* cmd_record => run_command => main */
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{ 3, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND, FAKE_IP_PERF_MAIN, },
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/* malloc => cmd_record => run_command => main */
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{ 4, FAKE_IP_LIBC_MALLOC, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND,
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FAKE_IP_PERF_MAIN, },
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/* free => cmd_record => run_command => main */
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{ 4, FAKE_IP_LIBC_FREE, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND,
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FAKE_IP_PERF_MAIN, },
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/* main */
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{ 1, FAKE_IP_PERF_MAIN, },
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/* page_fault => sys_perf_event_open => run_command => main */
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{ 4, FAKE_IP_KERNEL_PAGE_FAULT, FAKE_IP_KERNEL_SYS_PERF_EVENT_OPEN,
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FAKE_IP_PERF_RUN_COMMAND, FAKE_IP_PERF_MAIN, },
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/* main */
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{ 1, FAKE_IP_BASH_MAIN, },
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/* xmalloc => malloc => xmalloc => malloc => xmalloc => main */
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{ 6, FAKE_IP_BASH_XMALLOC, FAKE_IP_LIBC_MALLOC, FAKE_IP_BASH_XMALLOC,
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FAKE_IP_LIBC_MALLOC, FAKE_IP_BASH_XMALLOC, FAKE_IP_BASH_MAIN, },
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/* page_fault => malloc => main */
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{ 3, FAKE_IP_KERNEL_PAGE_FAULT, FAKE_IP_LIBC_MALLOC, FAKE_IP_BASH_MAIN, },
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};
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static int add_hist_entries(struct hists *hists, struct machine *machine)
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{
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struct addr_location al;
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struct evsel *evsel = hists_to_evsel(hists);
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struct perf_sample sample = { .period = 1000, };
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size_t i;
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for (i = 0; i < ARRAY_SIZE(fake_samples); i++) {
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struct hist_entry_iter iter = {
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.evsel = evsel,
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.sample = &sample,
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.hide_unresolved = false,
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};
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if (symbol_conf.cumulate_callchain)
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iter.ops = &hist_iter_cumulative;
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else
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iter.ops = &hist_iter_normal;
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sample.cpumode = PERF_RECORD_MISC_USER;
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sample.pid = fake_samples[i].pid;
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sample.tid = fake_samples[i].pid;
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sample.ip = fake_samples[i].ip;
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sample.callchain = (struct ip_callchain *)fake_callchains[i];
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if (machine__resolve(machine, &al, &sample) < 0)
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goto out;
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if (hist_entry_iter__add(&iter, &al, sysctl_perf_event_max_stack,
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NULL) < 0) {
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addr_location__put(&al);
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goto out;
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}
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fake_samples[i].thread = al.thread;
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fake_samples[i].map = al.map;
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fake_samples[i].sym = al.sym;
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}
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return TEST_OK;
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out:
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pr_debug("Not enough memory for adding a hist entry\n");
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return TEST_FAIL;
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}
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static void del_hist_entries(struct hists *hists)
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{
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struct hist_entry *he;
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struct rb_root_cached *root_in;
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struct rb_root_cached *root_out;
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struct rb_node *node;
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if (hists__has(hists, need_collapse))
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root_in = &hists->entries_collapsed;
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else
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root_in = hists->entries_in;
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root_out = &hists->entries;
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while (!RB_EMPTY_ROOT(&root_out->rb_root)) {
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node = rb_first_cached(root_out);
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he = rb_entry(node, struct hist_entry, rb_node);
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rb_erase_cached(node, root_out);
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rb_erase_cached(&he->rb_node_in, root_in);
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hist_entry__delete(he);
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}
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}
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typedef int (*test_fn_t)(struct evsel *, struct machine *);
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#define COMM(he) (thread__comm_str(he->thread))
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#define DSO(he) (he->ms.map->dso->short_name)
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#define SYM(he) (he->ms.sym->name)
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#define CPU(he) (he->cpu)
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#define PID(he) (he->thread->tid)
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#define DEPTH(he) (he->callchain->max_depth)
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#define CDSO(cl) (cl->ms.map->dso->short_name)
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#define CSYM(cl) (cl->ms.sym->name)
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struct result {
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u64 children;
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u64 self;
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const char *comm;
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const char *dso;
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const char *sym;
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};
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struct callchain_result {
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u64 nr;
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struct {
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const char *dso;
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const char *sym;
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} node[10];
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};
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static int do_test(struct hists *hists, struct result *expected, size_t nr_expected,
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struct callchain_result *expected_callchain, size_t nr_callchain)
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{
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char buf[32];
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size_t i, c;
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struct hist_entry *he;
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struct rb_root *root;
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struct rb_node *node;
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struct callchain_node *cnode;
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struct callchain_list *clist;
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/*
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* adding and deleting hist entries must be done outside of this
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* function since TEST_ASSERT_VAL() returns in case of failure.
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*/
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hists__collapse_resort(hists, NULL);
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perf_evsel__output_resort(hists_to_evsel(hists), NULL);
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if (verbose > 2) {
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pr_info("use callchain: %d, cumulate callchain: %d\n",
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symbol_conf.use_callchain,
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symbol_conf.cumulate_callchain);
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print_hists_out(hists);
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}
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root = &hists->entries.rb_root;
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for (node = rb_first(root), i = 0;
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node && (he = rb_entry(node, struct hist_entry, rb_node));
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node = rb_next(node), i++) {
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scnprintf(buf, sizeof(buf), "Invalid hist entry #%zd", i);
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TEST_ASSERT_VAL("Incorrect number of hist entry",
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i < nr_expected);
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TEST_ASSERT_VAL(buf, he->stat.period == expected[i].self &&
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!strcmp(COMM(he), expected[i].comm) &&
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!strcmp(DSO(he), expected[i].dso) &&
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!strcmp(SYM(he), expected[i].sym));
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if (symbol_conf.cumulate_callchain)
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TEST_ASSERT_VAL(buf, he->stat_acc->period == expected[i].children);
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if (!symbol_conf.use_callchain)
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continue;
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/* check callchain entries */
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root = &he->callchain->node.rb_root;
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TEST_ASSERT_VAL("callchains expected", !RB_EMPTY_ROOT(root));
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cnode = rb_entry(rb_first(root), struct callchain_node, rb_node);
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c = 0;
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list_for_each_entry(clist, &cnode->val, list) {
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scnprintf(buf, sizeof(buf), "Invalid callchain entry #%zd/%zd", i, c);
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TEST_ASSERT_VAL("Incorrect number of callchain entry",
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c < expected_callchain[i].nr);
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TEST_ASSERT_VAL(buf,
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!strcmp(CDSO(clist), expected_callchain[i].node[c].dso) &&
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!strcmp(CSYM(clist), expected_callchain[i].node[c].sym));
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c++;
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}
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/* TODO: handle multiple child nodes properly */
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TEST_ASSERT_VAL("Incorrect number of callchain entry",
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c <= expected_callchain[i].nr);
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}
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TEST_ASSERT_VAL("Incorrect number of hist entry",
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i == nr_expected);
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TEST_ASSERT_VAL("Incorrect number of callchain entry",
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!symbol_conf.use_callchain || nr_expected == nr_callchain);
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return 0;
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}
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/* NO callchain + NO children */
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static int test1(struct evsel *evsel, struct machine *machine)
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{
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int err;
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struct hists *hists = evsel__hists(evsel);
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/*
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* expected output:
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*
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* Overhead Command Shared Object Symbol
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* ======== ======= ============= ==============
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* 20.00% perf perf [.] main
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* 10.00% bash [kernel] [k] page_fault
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* 10.00% bash bash [.] main
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* 10.00% bash bash [.] xmalloc
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* 10.00% perf [kernel] [k] page_fault
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* 10.00% perf [kernel] [k] schedule
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* 10.00% perf libc [.] free
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* 10.00% perf libc [.] malloc
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* 10.00% perf perf [.] cmd_record
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*/
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struct result expected[] = {
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{ 0, 2000, "perf", "perf", "main" },
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{ 0, 1000, "bash", "[kernel]", "page_fault" },
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{ 0, 1000, "bash", "bash", "main" },
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{ 0, 1000, "bash", "bash", "xmalloc" },
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{ 0, 1000, "perf", "[kernel]", "page_fault" },
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{ 0, 1000, "perf", "[kernel]", "schedule" },
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{ 0, 1000, "perf", "libc", "free" },
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{ 0, 1000, "perf", "libc", "malloc" },
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{ 0, 1000, "perf", "perf", "cmd_record" },
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};
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symbol_conf.use_callchain = false;
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symbol_conf.cumulate_callchain = false;
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perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
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setup_sorting(NULL);
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callchain_register_param(&callchain_param);
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err = add_hist_entries(hists, machine);
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if (err < 0)
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goto out;
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err = do_test(hists, expected, ARRAY_SIZE(expected), NULL, 0);
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out:
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del_hist_entries(hists);
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reset_output_field();
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return err;
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}
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/* callcain + NO children */
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static int test2(struct evsel *evsel, struct machine *machine)
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{
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int err;
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struct hists *hists = evsel__hists(evsel);
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/*
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* expected output:
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*
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* Overhead Command Shared Object Symbol
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* ======== ======= ============= ==============
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* 20.00% perf perf [.] main
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* |
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* --- main
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*
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* 10.00% bash [kernel] [k] page_fault
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* |
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* --- page_fault
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* malloc
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* main
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*
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* 10.00% bash bash [.] main
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* |
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* --- main
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*
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* 10.00% bash bash [.] xmalloc
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* |
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* --- xmalloc
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* malloc
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* xmalloc <--- NOTE: there's a cycle
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* malloc
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* xmalloc
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* main
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*
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* 10.00% perf [kernel] [k] page_fault
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* |
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* --- page_fault
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* sys_perf_event_open
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* run_command
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* main
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*
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* 10.00% perf [kernel] [k] schedule
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* |
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* --- schedule
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* run_command
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* main
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*
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* 10.00% perf libc [.] free
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* |
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* --- free
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* cmd_record
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* run_command
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* main
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*
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* 10.00% perf libc [.] malloc
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* |
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* --- malloc
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* cmd_record
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* run_command
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* main
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*
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* 10.00% perf perf [.] cmd_record
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* |
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* --- cmd_record
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* run_command
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* main
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*
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*/
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struct result expected[] = {
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{ 0, 2000, "perf", "perf", "main" },
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{ 0, 1000, "bash", "[kernel]", "page_fault" },
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{ 0, 1000, "bash", "bash", "main" },
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{ 0, 1000, "bash", "bash", "xmalloc" },
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{ 0, 1000, "perf", "[kernel]", "page_fault" },
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{ 0, 1000, "perf", "[kernel]", "schedule" },
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{ 0, 1000, "perf", "libc", "free" },
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{ 0, 1000, "perf", "libc", "malloc" },
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{ 0, 1000, "perf", "perf", "cmd_record" },
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};
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struct callchain_result expected_callchain[] = {
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{
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1, { { "perf", "main" }, },
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},
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{
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3, { { "[kernel]", "page_fault" },
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{ "libc", "malloc" },
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{ "bash", "main" }, },
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},
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{
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1, { { "bash", "main" }, },
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},
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{
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6, { { "bash", "xmalloc" },
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{ "libc", "malloc" },
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{ "bash", "xmalloc" },
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{ "libc", "malloc" },
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{ "bash", "xmalloc" },
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{ "bash", "main" }, },
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},
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{
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4, { { "[kernel]", "page_fault" },
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{ "[kernel]", "sys_perf_event_open" },
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{ "perf", "run_command" },
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{ "perf", "main" }, },
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},
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{
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3, { { "[kernel]", "schedule" },
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{ "perf", "run_command" },
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{ "perf", "main" }, },
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},
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{
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4, { { "libc", "free" },
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{ "perf", "cmd_record" },
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{ "perf", "run_command" },
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{ "perf", "main" }, },
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},
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{
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4, { { "libc", "malloc" },
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{ "perf", "cmd_record" },
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{ "perf", "run_command" },
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{ "perf", "main" }, },
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},
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{
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3, { { "perf", "cmd_record" },
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{ "perf", "run_command" },
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{ "perf", "main" }, },
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},
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};
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symbol_conf.use_callchain = true;
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symbol_conf.cumulate_callchain = false;
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perf_evsel__set_sample_bit(evsel, CALLCHAIN);
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setup_sorting(NULL);
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callchain_register_param(&callchain_param);
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err = add_hist_entries(hists, machine);
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if (err < 0)
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goto out;
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err = do_test(hists, expected, ARRAY_SIZE(expected),
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expected_callchain, ARRAY_SIZE(expected_callchain));
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out:
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del_hist_entries(hists);
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reset_output_field();
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return err;
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}
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|
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/* NO callchain + children */
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static int test3(struct evsel *evsel, struct machine *machine)
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{
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int err;
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struct hists *hists = evsel__hists(evsel);
|
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/*
|
|
* expected output:
|
|
*
|
|
* Children Self Command Shared Object Symbol
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|
* ======== ======== ======= ============= =======================
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|
* 70.00% 20.00% perf perf [.] main
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|
* 50.00% 0.00% perf perf [.] run_command
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* 30.00% 10.00% bash bash [.] main
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* 30.00% 10.00% perf perf [.] cmd_record
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* 20.00% 0.00% bash libc [.] malloc
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* 10.00% 10.00% bash [kernel] [k] page_fault
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* 10.00% 10.00% bash bash [.] xmalloc
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* 10.00% 10.00% perf [kernel] [k] page_fault
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* 10.00% 10.00% perf libc [.] malloc
|
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* 10.00% 10.00% perf [kernel] [k] schedule
|
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* 10.00% 10.00% perf libc [.] free
|
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* 10.00% 0.00% perf [kernel] [k] sys_perf_event_open
|
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*/
|
|
struct result expected[] = {
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|
{ 7000, 2000, "perf", "perf", "main" },
|
|
{ 5000, 0, "perf", "perf", "run_command" },
|
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{ 3000, 1000, "bash", "bash", "main" },
|
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{ 3000, 1000, "perf", "perf", "cmd_record" },
|
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{ 2000, 0, "bash", "libc", "malloc" },
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{ 1000, 1000, "bash", "[kernel]", "page_fault" },
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{ 1000, 1000, "bash", "bash", "xmalloc" },
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{ 1000, 1000, "perf", "[kernel]", "page_fault" },
|
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{ 1000, 1000, "perf", "[kernel]", "schedule" },
|
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{ 1000, 1000, "perf", "libc", "free" },
|
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{ 1000, 1000, "perf", "libc", "malloc" },
|
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{ 1000, 0, "perf", "[kernel]", "sys_perf_event_open" },
|
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};
|
|
|
|
symbol_conf.use_callchain = false;
|
|
symbol_conf.cumulate_callchain = true;
|
|
perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
|
|
|
|
setup_sorting(NULL);
|
|
callchain_register_param(&callchain_param);
|
|
|
|
err = add_hist_entries(hists, machine);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = do_test(hists, expected, ARRAY_SIZE(expected), NULL, 0);
|
|
|
|
out:
|
|
del_hist_entries(hists);
|
|
reset_output_field();
|
|
return err;
|
|
}
|
|
|
|
/* callchain + children */
|
|
static int test4(struct evsel *evsel, struct machine *machine)
|
|
{
|
|
int err;
|
|
struct hists *hists = evsel__hists(evsel);
|
|
/*
|
|
* expected output:
|
|
*
|
|
* Children Self Command Shared Object Symbol
|
|
* ======== ======== ======= ============= =======================
|
|
* 70.00% 20.00% perf perf [.] main
|
|
* |
|
|
* --- main
|
|
*
|
|
* 50.00% 0.00% perf perf [.] run_command
|
|
* |
|
|
* --- run_command
|
|
* main
|
|
*
|
|
* 30.00% 10.00% bash bash [.] main
|
|
* |
|
|
* --- main
|
|
*
|
|
* 30.00% 10.00% perf perf [.] cmd_record
|
|
* |
|
|
* --- cmd_record
|
|
* run_command
|
|
* main
|
|
*
|
|
* 20.00% 0.00% bash libc [.] malloc
|
|
* |
|
|
* --- malloc
|
|
* |
|
|
* |--50.00%-- xmalloc
|
|
* | main
|
|
* --50.00%-- main
|
|
*
|
|
* 10.00% 10.00% bash [kernel] [k] page_fault
|
|
* |
|
|
* --- page_fault
|
|
* malloc
|
|
* main
|
|
*
|
|
* 10.00% 10.00% bash bash [.] xmalloc
|
|
* |
|
|
* --- xmalloc
|
|
* malloc
|
|
* xmalloc <--- NOTE: there's a cycle
|
|
* malloc
|
|
* xmalloc
|
|
* main
|
|
*
|
|
* 10.00% 0.00% perf [kernel] [k] sys_perf_event_open
|
|
* |
|
|
* --- sys_perf_event_open
|
|
* run_command
|
|
* main
|
|
*
|
|
* 10.00% 10.00% perf [kernel] [k] page_fault
|
|
* |
|
|
* --- page_fault
|
|
* sys_perf_event_open
|
|
* run_command
|
|
* main
|
|
*
|
|
* 10.00% 10.00% perf [kernel] [k] schedule
|
|
* |
|
|
* --- schedule
|
|
* run_command
|
|
* main
|
|
*
|
|
* 10.00% 10.00% perf libc [.] free
|
|
* |
|
|
* --- free
|
|
* cmd_record
|
|
* run_command
|
|
* main
|
|
*
|
|
* 10.00% 10.00% perf libc [.] malloc
|
|
* |
|
|
* --- malloc
|
|
* cmd_record
|
|
* run_command
|
|
* main
|
|
*
|
|
*/
|
|
struct result expected[] = {
|
|
{ 7000, 2000, "perf", "perf", "main" },
|
|
{ 5000, 0, "perf", "perf", "run_command" },
|
|
{ 3000, 1000, "bash", "bash", "main" },
|
|
{ 3000, 1000, "perf", "perf", "cmd_record" },
|
|
{ 2000, 0, "bash", "libc", "malloc" },
|
|
{ 1000, 1000, "bash", "[kernel]", "page_fault" },
|
|
{ 1000, 1000, "bash", "bash", "xmalloc" },
|
|
{ 1000, 0, "perf", "[kernel]", "sys_perf_event_open" },
|
|
{ 1000, 1000, "perf", "[kernel]", "page_fault" },
|
|
{ 1000, 1000, "perf", "[kernel]", "schedule" },
|
|
{ 1000, 1000, "perf", "libc", "free" },
|
|
{ 1000, 1000, "perf", "libc", "malloc" },
|
|
};
|
|
struct callchain_result expected_callchain[] = {
|
|
{
|
|
1, { { "perf", "main" }, },
|
|
},
|
|
{
|
|
2, { { "perf", "run_command" },
|
|
{ "perf", "main" }, },
|
|
},
|
|
{
|
|
1, { { "bash", "main" }, },
|
|
},
|
|
{
|
|
3, { { "perf", "cmd_record" },
|
|
{ "perf", "run_command" },
|
|
{ "perf", "main" }, },
|
|
},
|
|
{
|
|
4, { { "libc", "malloc" },
|
|
{ "bash", "xmalloc" },
|
|
{ "bash", "main" },
|
|
{ "bash", "main" }, },
|
|
},
|
|
{
|
|
3, { { "[kernel]", "page_fault" },
|
|
{ "libc", "malloc" },
|
|
{ "bash", "main" }, },
|
|
},
|
|
{
|
|
6, { { "bash", "xmalloc" },
|
|
{ "libc", "malloc" },
|
|
{ "bash", "xmalloc" },
|
|
{ "libc", "malloc" },
|
|
{ "bash", "xmalloc" },
|
|
{ "bash", "main" }, },
|
|
},
|
|
{
|
|
3, { { "[kernel]", "sys_perf_event_open" },
|
|
{ "perf", "run_command" },
|
|
{ "perf", "main" }, },
|
|
},
|
|
{
|
|
4, { { "[kernel]", "page_fault" },
|
|
{ "[kernel]", "sys_perf_event_open" },
|
|
{ "perf", "run_command" },
|
|
{ "perf", "main" }, },
|
|
},
|
|
{
|
|
3, { { "[kernel]", "schedule" },
|
|
{ "perf", "run_command" },
|
|
{ "perf", "main" }, },
|
|
},
|
|
{
|
|
4, { { "libc", "free" },
|
|
{ "perf", "cmd_record" },
|
|
{ "perf", "run_command" },
|
|
{ "perf", "main" }, },
|
|
},
|
|
{
|
|
4, { { "libc", "malloc" },
|
|
{ "perf", "cmd_record" },
|
|
{ "perf", "run_command" },
|
|
{ "perf", "main" }, },
|
|
},
|
|
};
|
|
|
|
symbol_conf.use_callchain = true;
|
|
symbol_conf.cumulate_callchain = true;
|
|
perf_evsel__set_sample_bit(evsel, CALLCHAIN);
|
|
|
|
setup_sorting(NULL);
|
|
|
|
callchain_param = callchain_param_default;
|
|
callchain_register_param(&callchain_param);
|
|
|
|
err = add_hist_entries(hists, machine);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = do_test(hists, expected, ARRAY_SIZE(expected),
|
|
expected_callchain, ARRAY_SIZE(expected_callchain));
|
|
|
|
out:
|
|
del_hist_entries(hists);
|
|
reset_output_field();
|
|
return err;
|
|
}
|
|
|
|
int test__hists_cumulate(struct test *test __maybe_unused, int subtest __maybe_unused)
|
|
{
|
|
int err = TEST_FAIL;
|
|
struct machines machines;
|
|
struct machine *machine;
|
|
struct evsel *evsel;
|
|
struct evlist *evlist = evlist__new();
|
|
size_t i;
|
|
test_fn_t testcases[] = {
|
|
test1,
|
|
test2,
|
|
test3,
|
|
test4,
|
|
};
|
|
|
|
TEST_ASSERT_VAL("No memory", evlist);
|
|
|
|
err = parse_events(evlist, "cpu-clock", NULL);
|
|
if (err)
|
|
goto out;
|
|
err = TEST_FAIL;
|
|
|
|
machines__init(&machines);
|
|
|
|
/* setup threads/dso/map/symbols also */
|
|
machine = setup_fake_machine(&machines);
|
|
if (!machine)
|
|
goto out;
|
|
|
|
if (verbose > 1)
|
|
machine__fprintf(machine, stderr);
|
|
|
|
evsel = evlist__first(evlist);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(testcases); i++) {
|
|
err = testcases[i](evsel, machine);
|
|
if (err < 0)
|
|
break;
|
|
}
|
|
|
|
out:
|
|
/* tear down everything */
|
|
evlist__delete(evlist);
|
|
machines__exit(&machines);
|
|
|
|
return err;
|
|
}
|