149 lines
4.5 KiB
C
149 lines
4.5 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <time.h>
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#include <errno.h>
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#include <limits.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <corkscrew/backtrace.h>
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#include "tombstone.h"
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#include "utility.h"
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#define STACK_DEPTH 32
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static void dump_process_header(log_t* log, pid_t pid) {
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char path[PATH_MAX];
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char procnamebuf[1024];
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char* procname = NULL;
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FILE* fp;
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snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
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if ((fp = fopen(path, "r"))) {
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procname = fgets(procnamebuf, sizeof(procnamebuf), fp);
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fclose(fp);
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}
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time_t t = time(NULL);
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struct tm tm;
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localtime_r(&t, &tm);
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char timestr[64];
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strftime(timestr, sizeof(timestr), "%F %T", &tm);
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_LOG(log, false, "\n\n----- pid %d at %s -----\n", pid, timestr);
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if (procname) {
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_LOG(log, false, "Cmd line: %s\n", procname);
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}
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}
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static void dump_process_footer(log_t* log, pid_t pid) {
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_LOG(log, false, "\n----- end %d -----\n", pid);
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}
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static void dump_thread(log_t* log, pid_t tid, ptrace_context_t* context, bool attached,
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bool* detach_failed, int* total_sleep_time_usec) {
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char path[PATH_MAX];
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char threadnamebuf[1024];
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char* threadname = NULL;
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FILE* fp;
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snprintf(path, sizeof(path), "/proc/%d/comm", tid);
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if ((fp = fopen(path, "r"))) {
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threadname = fgets(threadnamebuf, sizeof(threadnamebuf), fp);
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fclose(fp);
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if (threadname) {
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size_t len = strlen(threadname);
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if (len && threadname[len - 1] == '\n') {
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threadname[len - 1] = '\0';
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}
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}
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}
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_LOG(log, false, "\n\"%s\" sysTid=%d\n", threadname ? threadname : "<unknown>", tid);
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if (!attached && ptrace(PTRACE_ATTACH, tid, 0, 0) < 0) {
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_LOG(log, false, "Could not attach to thread: %s\n", strerror(errno));
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return;
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}
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wait_for_stop(tid, total_sleep_time_usec);
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backtrace_frame_t backtrace[STACK_DEPTH];
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ssize_t frames = unwind_backtrace_ptrace(tid, context, backtrace, 0, STACK_DEPTH);
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if (frames <= 0) {
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_LOG(log, false, "Could not obtain stack trace for thread.\n");
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} else {
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backtrace_symbol_t backtrace_symbols[STACK_DEPTH];
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get_backtrace_symbols_ptrace(context, backtrace, frames, backtrace_symbols);
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for (size_t i = 0; i < (size_t)frames; i++) {
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char line[MAX_BACKTRACE_LINE_LENGTH];
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format_backtrace_line(i, &backtrace[i], &backtrace_symbols[i],
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line, MAX_BACKTRACE_LINE_LENGTH);
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_LOG(log, false, " %s\n", line);
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}
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free_backtrace_symbols(backtrace_symbols, frames);
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}
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if (!attached && ptrace(PTRACE_DETACH, tid, 0, 0) != 0) {
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LOG("ptrace detach from %d failed: %s\n", tid, strerror(errno));
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*detach_failed = true;
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}
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}
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void dump_backtrace(int fd, pid_t pid, pid_t tid, bool* detach_failed,
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int* total_sleep_time_usec) {
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log_t log;
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log.tfd = fd;
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log.quiet = true;
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ptrace_context_t* context = load_ptrace_context(tid);
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dump_process_header(&log, pid);
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dump_thread(&log, tid, context, true, detach_failed, total_sleep_time_usec);
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char task_path[64];
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snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
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DIR* d = opendir(task_path);
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if (d) {
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struct dirent debuf;
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struct dirent *de;
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while (!readdir_r(d, &debuf, &de) && de) {
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if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) {
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continue;
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}
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char* end;
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pid_t new_tid = strtoul(de->d_name, &end, 10);
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if (*end || new_tid == tid) {
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continue;
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}
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dump_thread(&log, new_tid, context, false, detach_failed, total_sleep_time_usec);
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}
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closedir(d);
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}
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dump_process_footer(&log, pid);
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free_ptrace_context(context);
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}
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