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