Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <stddef.h> |
| 18 | #include <stdbool.h> |
| 19 | #include <stdlib.h> |
| 20 | #include <string.h> |
| 21 | #include <stdio.h> |
| 22 | #include <time.h> |
| 23 | #include <errno.h> |
| 24 | #include <limits.h> |
| 25 | #include <dirent.h> |
| 26 | #include <unistd.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/ptrace.h> |
| 29 | |
| 30 | #include <corkscrew/backtrace.h> |
| 31 | |
| 32 | #include "tombstone.h" |
| 33 | #include "utility.h" |
| 34 | |
| 35 | #define STACK_DEPTH 32 |
| 36 | |
| 37 | static void dump_process_header(log_t* log, pid_t pid) { |
| 38 | char path[PATH_MAX]; |
| 39 | char procnamebuf[1024]; |
| 40 | char* procname = NULL; |
| 41 | FILE* fp; |
| 42 | |
| 43 | snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); |
| 44 | if ((fp = fopen(path, "r"))) { |
| 45 | procname = fgets(procnamebuf, sizeof(procnamebuf), fp); |
| 46 | fclose(fp); |
| 47 | } |
| 48 | |
| 49 | time_t t = time(NULL); |
| 50 | struct tm tm; |
| 51 | localtime_r(&t, &tm); |
| 52 | char timestr[64]; |
| 53 | strftime(timestr, sizeof(timestr), "%F %T", &tm); |
| 54 | _LOG(log, false, "\n\n----- pid %d at %s -----\n", pid, timestr); |
| 55 | |
| 56 | if (procname) { |
Jeff Brown | 9cec175 | 2012-06-08 14:21:51 -0700 | [diff] [blame] | 57 | _LOG(log, false, "Cmd line: %s\n", procname); |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 58 | } |
| 59 | } |
| 60 | |
| 61 | static void dump_process_footer(log_t* log, pid_t pid) { |
| 62 | _LOG(log, false, "\n----- end %d -----\n", pid); |
| 63 | } |
| 64 | |
| 65 | static void dump_thread(log_t* log, pid_t tid, ptrace_context_t* context, bool attached, |
| 66 | bool* detach_failed, int* total_sleep_time_usec) { |
| 67 | char path[PATH_MAX]; |
| 68 | char threadnamebuf[1024]; |
| 69 | char* threadname = NULL; |
| 70 | FILE* fp; |
| 71 | |
| 72 | snprintf(path, sizeof(path), "/proc/%d/comm", tid); |
| 73 | if ((fp = fopen(path, "r"))) { |
| 74 | threadname = fgets(threadnamebuf, sizeof(threadnamebuf), fp); |
| 75 | fclose(fp); |
| 76 | if (threadname) { |
| 77 | size_t len = strlen(threadname); |
| 78 | if (len && threadname[len - 1] == '\n') { |
| 79 | threadname[len - 1] = '\0'; |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | _LOG(log, false, "\n\"%s\" sysTid=%d\n", threadname ? threadname : "<unknown>", tid); |
| 85 | |
| 86 | if (!attached && ptrace(PTRACE_ATTACH, tid, 0, 0) < 0) { |
| 87 | _LOG(log, false, "Could not attach to thread: %s\n", strerror(errno)); |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | wait_for_stop(tid, total_sleep_time_usec); |
| 92 | |
| 93 | backtrace_frame_t backtrace[STACK_DEPTH]; |
| 94 | ssize_t frames = unwind_backtrace_ptrace(tid, context, backtrace, 0, STACK_DEPTH); |
| 95 | if (frames <= 0) { |
| 96 | _LOG(log, false, "Could not obtain stack trace for thread.\n"); |
| 97 | } else { |
| 98 | backtrace_symbol_t backtrace_symbols[STACK_DEPTH]; |
| 99 | get_backtrace_symbols_ptrace(context, backtrace, frames, backtrace_symbols); |
| 100 | for (size_t i = 0; i < (size_t)frames; i++) { |
| 101 | char line[MAX_BACKTRACE_LINE_LENGTH]; |
| 102 | format_backtrace_line(i, &backtrace[i], &backtrace_symbols[i], |
| 103 | line, MAX_BACKTRACE_LINE_LENGTH); |
| 104 | _LOG(log, false, " %s\n", line); |
| 105 | } |
| 106 | free_backtrace_symbols(backtrace_symbols, frames); |
| 107 | } |
| 108 | |
| 109 | if (!attached && ptrace(PTRACE_DETACH, tid, 0, 0) != 0) { |
| 110 | LOG("ptrace detach from %d failed: %s\n", tid, strerror(errno)); |
| 111 | *detach_failed = true; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | void dump_backtrace(int fd, pid_t pid, pid_t tid, bool* detach_failed, |
| 116 | int* total_sleep_time_usec) { |
| 117 | log_t log; |
| 118 | log.tfd = fd; |
| 119 | log.quiet = true; |
| 120 | |
| 121 | ptrace_context_t* context = load_ptrace_context(tid); |
| 122 | dump_process_header(&log, pid); |
| 123 | dump_thread(&log, tid, context, true, detach_failed, total_sleep_time_usec); |
| 124 | |
| 125 | char task_path[64]; |
| 126 | snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid); |
| 127 | DIR* d = opendir(task_path); |
| 128 | if (d) { |
| 129 | struct dirent debuf; |
| 130 | struct dirent *de; |
| 131 | while (!readdir_r(d, &debuf, &de) && de) { |
| 132 | if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) { |
| 133 | continue; |
| 134 | } |
| 135 | |
| 136 | char* end; |
| 137 | pid_t new_tid = strtoul(de->d_name, &end, 10); |
| 138 | if (*end || new_tid == tid) { |
| 139 | continue; |
| 140 | } |
| 141 | |
| 142 | dump_thread(&log, new_tid, context, false, detach_failed, total_sleep_time_usec); |
| 143 | } |
| 144 | closedir(d); |
| 145 | } |
| 146 | |
| 147 | dump_process_footer(&log, pid); |
| 148 | free_ptrace_context(context); |
| 149 | } |