utils.c revision 54bcc5ffd5a79f4f194089c58d3de571532bf39b 
1/*
2 * Copyright (C) 2008 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 <dirent.h>
18#include <errno.h>
19#include <fcntl.h>
20#include <limits.h>
21#include <poll.h>
22#include <signal.h>
23#include <stdarg.h>
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
27#include <sys/inotify.h>
28#include <sys/stat.h>
29#include <sys/time.h>
30#include <sys/wait.h>
31#include <sys/klog.h>
32#include <time.h>
33#include <unistd.h>
34#include <sys/prctl.h>
35
36#include <cutils/debugger.h>
37#include <cutils/properties.h>
38#include <cutils/sockets.h>
39#include <private/android_filesystem_config.h>
40
41#include <selinux/android.h>
42
43#include "dumpstate.h"
44
45static const int64_t NANOS_PER_SEC = 1000000000;
46
47/* list of native processes to include in the native dumps */
48static const char* native_processes_to_dump[] = {
49        "/system/bin/drmserver",
50        "/system/bin/mediaserver",
51        "/system/bin/sdcard",
52        "/system/bin/surfaceflinger",
53        NULL,
54};
55
56static uint64_t nanotime() {
57    struct timespec ts;
58    clock_gettime(CLOCK_MONOTONIC, &ts);
59    return (uint64_t)ts.tv_sec * NANOS_PER_SEC + ts.tv_nsec;
60}
61
62void for_each_userid(void (*func)(int), const char *header) {
63    DIR *d;
64    struct dirent *de;
65
66    if (header) printf("\n------ %s ------\n", header);
67    func(0);
68
69    if (!(d = opendir("/data/system/users"))) {
70        printf("Failed to open /data/system/users (%s)\n", strerror(errno));
71        return;
72    }
73
74    while ((de = readdir(d))) {
75        int userid;
76        if (de->d_type != DT_DIR || !(userid = atoi(de->d_name))) {
77            continue;
78        }
79        func(userid);
80    }
81
82    closedir(d);
83}
84
85static void __for_each_pid(void (*helper)(int, const char *, void *), const char *header, void *arg) {
86    DIR *d;
87    struct dirent *de;
88
89    if (!(d = opendir("/proc"))) {
90        printf("Failed to open /proc (%s)\n", strerror(errno));
91        return;
92    }
93
94    printf("\n------ %s ------\n", header);
95    while ((de = readdir(d))) {
96        int pid;
97        int fd;
98        char cmdpath[255];
99        char cmdline[255];
100
101        if (!(pid = atoi(de->d_name))) {
102            continue;
103        }
104
105        sprintf(cmdpath,"/proc/%d/cmdline", pid);
106        memset(cmdline, 0, sizeof(cmdline));
107        if ((fd = TEMP_FAILURE_RETRY(open(cmdpath, O_RDONLY))) < 0) {
108            strcpy(cmdline, "N/A");
109        } else {
110            read(fd, cmdline, sizeof(cmdline) - 1);
111            close(fd);
112        }
113        helper(pid, cmdline, arg);
114    }
115
116    closedir(d);
117}
118
119static void for_each_pid_helper(int pid, const char *cmdline, void *arg) {
120    for_each_pid_func *func = arg;
121    func(pid, cmdline);
122}
123
124void for_each_pid(for_each_pid_func func, const char *header) {
125    __for_each_pid(for_each_pid_helper, header, func);
126}
127
128static void for_each_tid_helper(int pid, const char *cmdline, void *arg) {
129    DIR *d;
130    struct dirent *de;
131    char taskpath[255];
132    for_each_tid_func *func = arg;
133
134    sprintf(taskpath, "/proc/%d/task", pid);
135
136    if (!(d = opendir(taskpath))) {
137        printf("Failed to open %s (%s)\n", taskpath, strerror(errno));
138        return;
139    }
140
141    func(pid, pid, cmdline);
142
143    while ((de = readdir(d))) {
144        int tid;
145        int fd;
146        char commpath[255];
147        char comm[255];
148
149        if (!(tid = atoi(de->d_name))) {
150            continue;
151        }
152
153        if (tid == pid)
154            continue;
155
156        sprintf(commpath,"/proc/%d/comm", tid);
157        memset(comm, 0, sizeof(comm));
158        if ((fd = TEMP_FAILURE_RETRY(open(commpath, O_RDONLY))) < 0) {
159            strcpy(comm, "N/A");
160        } else {
161            char *c;
162            read(fd, comm, sizeof(comm) - 1);
163            close(fd);
164
165            c = strrchr(comm, '\n');
166            if (c) {
167                *c = '\0';
168            }
169        }
170        func(pid, tid, comm);
171    }
172
173    closedir(d);
174}
175
176void for_each_tid(for_each_tid_func func, const char *header) {
177    __for_each_pid(for_each_tid_helper, header, func);
178}
179
180void show_wchan(int pid, int tid, const char *name) {
181    char path[255];
182    char buffer[255];
183    int fd;
184    char name_buffer[255];
185
186    memset(buffer, 0, sizeof(buffer));
187
188    sprintf(path, "/proc/%d/wchan", tid);
189    if ((fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY))) < 0) {
190        printf("Failed to open '%s' (%s)\n", path, strerror(errno));
191        return;
192    }
193
194    if (read(fd, buffer, sizeof(buffer)) < 0) {
195        printf("Failed to read '%s' (%s)\n", path, strerror(errno));
196        goto out_close;
197    }
198
199    snprintf(name_buffer, sizeof(name_buffer), "%*s%s",
200             pid == tid ? 0 : 3, "", name);
201
202    printf("%-7d %-32s %s\n", tid, name_buffer, buffer);
203
204out_close:
205    close(fd);
206    return;
207}
208
209void do_dump_settings(int userid) {
210    char title[255];
211    char dbpath[255];
212    char sql[255];
213    sprintf(title, "SYSTEM SETTINGS (user %d)", userid);
214    if (userid == 0) {
215        strcpy(dbpath, "/data/data/com.android.providers.settings/databases/settings.db");
216        strcpy(sql, "pragma user_version; select * from system; select * from secure; select * from global;");
217    } else {
218        sprintf(dbpath, "/data/system/users/%d/settings.db", userid);
219        strcpy(sql, "pragma user_version; select * from system; select * from secure;");
220    }
221    run_command(title, 20, SU_PATH, "root", "sqlite3", dbpath, sql, NULL);
222    return;
223}
224
225void do_dmesg() {
226    printf("------ KERNEL LOG (dmesg) ------\n");
227    /* Get size of kernel buffer */
228    int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0);
229    if (size <= 0) {
230        printf("Unexpected klogctl return value: %d\n\n", size);
231        return;
232    }
233    char *buf = (char *) malloc(size + 1);
234    if (buf == NULL) {
235        printf("memory allocation failed\n\n");
236        return;
237    }
238    int retval = klogctl(KLOG_READ_ALL, buf, size);
239    if (retval < 0) {
240        printf("klogctl failure\n\n");
241        free(buf);
242        return;
243    }
244    buf[retval] = '\0';
245    printf("%s\n\n", buf);
246    free(buf);
247    return;
248}
249
250void do_showmap(int pid, const char *name) {
251    char title[255];
252    char arg[255];
253
254    sprintf(title, "SHOW MAP %d (%s)", pid, name);
255    sprintf(arg, "%d", pid);
256    run_command(title, 10, SU_PATH, "root", "showmap", arg, NULL);
257}
258
259static int _dump_file_from_fd(const char *title, const char *path, int fd) {
260    if (title) printf("------ %s (%s", title, path);
261
262    if (title) {
263        struct stat st;
264        if (memcmp(path, "/proc/", 6) && memcmp(path, "/sys/", 5) && !fstat(fd, &st)) {
265            char stamp[80];
266            time_t mtime = st.st_mtime;
267            strftime(stamp, sizeof(stamp), "%Y-%m-%d %H:%M:%S", localtime(&mtime));
268            printf(": %s", stamp);
269        }
270        printf(") ------\n");
271    }
272
273    bool newline = false;
274    fd_set read_set;
275    struct timeval tm;
276    while (1) {
277        FD_ZERO(&read_set);
278        FD_SET(fd, &read_set);
279        /* Timeout if no data is read for 30 seconds. */
280        tm.tv_sec = 30;
281        tm.tv_usec = 0;
282        uint64_t elapsed = nanotime();
283        int ret = TEMP_FAILURE_RETRY(select(fd + 1, &read_set, NULL, NULL, &tm));
284        if (ret == -1) {
285            printf("*** %s: select failed: %s\n", path, strerror(errno));
286            newline = true;
287            break;
288        } else if (ret == 0) {
289            elapsed = nanotime() - elapsed;
290            printf("*** %s: Timed out after %.3fs\n", path,
291                   (float) elapsed / NANOS_PER_SEC);
292            newline = true;
293            break;
294        } else {
295            char buffer[65536];
296            ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, sizeof(buffer)));
297            if (bytes_read > 0) {
298                fwrite(buffer, bytes_read, 1, stdout);
299                newline = (buffer[bytes_read-1] == '\n');
300            } else {
301                if (bytes_read == -1) {
302                    printf("*** %s: Failed to read from fd: %s", path, strerror(errno));
303                    newline = true;
304                }
305                break;
306            }
307        }
308    }
309    TEMP_FAILURE_RETRY(close(fd));
310
311    if (!newline) printf("\n");
312    if (title) printf("\n");
313    return 0;
314}
315
316/* prints the contents of a file */
317int dump_file(const char *title, const char *path) {
318    int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC));
319    if (fd < 0) {
320        int err = errno;
321        if (title) printf("------ %s (%s) ------\n", title, path);
322        printf("*** %s: %s\n", path, strerror(err));
323        if (title) printf("\n");
324        return -1;
325    }
326    return _dump_file_from_fd(title, path, fd);
327}
328
329/* fd must have been opened with the flag O_NONBLOCK. With this flag set,
330 * it's possible to avoid issues where opening the file itself can get
331 * stuck.
332 */
333int dump_file_from_fd(const char *title, const char *path, int fd) {
334    int flags = fcntl(fd, F_GETFL);
335    if (flags == -1) {
336        printf("*** %s: failed to get flags on fd %d: %s\n", path, fd, strerror(errno));
337        return -1;
338    } else if (!(flags & O_NONBLOCK)) {
339        printf("*** %s: fd must have O_NONBLOCK set.\n", path);
340        return -1;
341    }
342    return _dump_file_from_fd(title, path, fd);
343}
344
345bool waitpid_with_timeout(pid_t pid, int timeout_seconds, int* status) {
346    sigset_t child_mask, old_mask;
347    sigemptyset(&child_mask);
348    sigaddset(&child_mask, SIGCHLD);
349
350    if (sigprocmask(SIG_BLOCK, &child_mask, &old_mask) == -1) {
351        printf("*** sigprocmask failed: %s\n", strerror(errno));
352        return false;
353    }
354
355    struct timespec ts;
356    ts.tv_sec = timeout_seconds;
357    ts.tv_nsec = 0;
358    int ret = TEMP_FAILURE_RETRY(sigtimedwait(&child_mask, NULL, &ts));
359    int saved_errno = errno;
360    // Set the signals back the way they were.
361    if (sigprocmask(SIG_SETMASK, &old_mask, NULL) == -1) {
362        printf("*** sigprocmask failed: %s\n", strerror(errno));
363        if (ret == 0) {
364            return false;
365        }
366    }
367    if (ret == -1) {
368        errno = saved_errno;
369        if (errno == EAGAIN) {
370            errno = ETIMEDOUT;
371        } else {
372            printf("*** sigtimedwait failed: %s\n", strerror(errno));
373        }
374        return false;
375    }
376
377    pid_t child_pid = waitpid(pid, status, WNOHANG);
378    if (child_pid != pid) {
379        if (child_pid != -1) {
380            printf("*** Waiting for pid %d, got pid %d instead\n", pid, child_pid);
381        } else {
382            printf("*** waitpid failed: %s\n", strerror(errno));
383        }
384        return false;
385    }
386    return true;
387}
388
389/* forks a command and waits for it to finish */
390int run_command(const char *title, int timeout_seconds, const char *command, ...) {
391    fflush(stdout);
392    uint64_t start = nanotime();
393    pid_t pid = fork();
394
395    /* handle error case */
396    if (pid < 0) {
397        printf("*** fork: %s\n", strerror(errno));
398        return pid;
399    }
400
401    /* handle child case */
402    if (pid == 0) {
403        const char *args[1024] = {command};
404        size_t arg;
405
406        /* make sure the child dies when dumpstate dies */
407        prctl(PR_SET_PDEATHSIG, SIGKILL);
408
409        /* just ignore SIGPIPE, will go down with parent's */
410        struct sigaction sigact;
411        memset(&sigact, 0, sizeof(sigact));
412        sigact.sa_handler = SIG_IGN;
413        sigaction(SIGPIPE, &sigact, NULL);
414
415        va_list ap;
416        va_start(ap, command);
417        if (title) printf("------ %s (%s", title, command);
418        for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) {
419            args[arg] = va_arg(ap, const char *);
420            if (args[arg] == NULL) break;
421            if (title) printf(" %s", args[arg]);
422        }
423        if (title) printf(") ------\n");
424        fflush(stdout);
425
426        execvp(command, (char**) args);
427        printf("*** exec(%s): %s\n", command, strerror(errno));
428        fflush(stdout);
429        _exit(-1);
430    }
431
432    /* handle parent case */
433    int status;
434    bool ret = waitpid_with_timeout(pid, timeout_seconds, &status);
435    uint64_t elapsed = nanotime() - start;
436    if (!ret) {
437        if (errno == ETIMEDOUT) {
438            printf("*** %s: Timed out after %.3fs (killing pid %d)\n", command,
439                   (float) elapsed / NANOS_PER_SEC, pid);
440        } else {
441            printf("*** %s: Error after %.4fs (killing pid %d)\n", command,
442                   (float) elapsed / NANOS_PER_SEC, pid);
443        }
444        kill(pid, SIGTERM);
445        if (!waitpid_with_timeout(pid, 5, NULL)) {
446            kill(pid, SIGKILL);
447            if (!waitpid_with_timeout(pid, 5, NULL)) {
448                printf("*** %s: Cannot kill %d even with SIGKILL.\n", command, pid);
449            }
450        }
451        return -1;
452    }
453
454    if (WIFSIGNALED(status)) {
455        printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status));
456    } else if (WIFEXITED(status) && WEXITSTATUS(status) > 0) {
457        printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status));
458    }
459    if (title) printf("[%s: %.3fs elapsed]\n\n", command, (float)elapsed / NANOS_PER_SEC);
460
461    return status;
462}
463
464size_t num_props = 0;
465static char* props[2000];
466
467static void print_prop(const char *key, const char *name, void *user) {
468    (void) user;
469    if (num_props < sizeof(props) / sizeof(props[0])) {
470        char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10];
471        snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name);
472        props[num_props++] = strdup(buf);
473    }
474}
475
476static int compare_prop(const void *a, const void *b) {
477    return strcmp(*(char * const *) a, *(char * const *) b);
478}
479
480/* prints all the system properties */
481void print_properties() {
482    size_t i;
483    num_props = 0;
484    property_list(print_prop, NULL);
485    qsort(&props, num_props, sizeof(props[0]), compare_prop);
486
487    printf("------ SYSTEM PROPERTIES ------\n");
488    for (i = 0; i < num_props; ++i) {
489        fputs(props[i], stdout);
490        free(props[i]);
491    }
492    printf("\n");
493}
494
495/* redirect output to a service control socket */
496void redirect_to_socket(FILE *redirect, const char *service) {
497    int s = android_get_control_socket(service);
498    if (s < 0) {
499        fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno));
500        exit(1);
501    }
502    if (listen(s, 4) < 0) {
503        fprintf(stderr, "listen(control socket): %s\n", strerror(errno));
504        exit(1);
505    }
506
507    struct sockaddr addr;
508    socklen_t alen = sizeof(addr);
509    int fd = accept(s, &addr, &alen);
510    if (fd < 0) {
511        fprintf(stderr, "accept(control socket): %s\n", strerror(errno));
512        exit(1);
513    }
514
515    fflush(redirect);
516    dup2(fd, fileno(redirect));
517    close(fd);
518}
519
520/* redirect output to a file */
521void redirect_to_file(FILE *redirect, char *path) {
522    char *chp = path;
523
524    /* skip initial slash */
525    if (chp[0] == '/')
526        chp++;
527
528    /* create leading directories, if necessary */
529    while (chp && chp[0]) {
530        chp = strchr(chp, '/');
531        if (chp) {
532            *chp = 0;
533            mkdir(path, 0770);  /* drwxrwx--- */
534            *chp++ = '/';
535        }
536    }
537
538    int fd = TEMP_FAILURE_RETRY(open(path, O_WRONLY | O_CREAT | O_TRUNC,
539                                     S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH));
540    if (fd < 0) {
541        fprintf(stderr, "%s: %s\n", path, strerror(errno));
542        exit(1);
543    }
544
545    TEMP_FAILURE_RETRY(dup2(fd, fileno(redirect)));
546    close(fd);
547}
548
549static bool should_dump_native_traces(const char* path) {
550    for (const char** p = native_processes_to_dump; *p; p++) {
551        if (!strcmp(*p, path)) {
552            return true;
553        }
554    }
555    return false;
556}
557
558/* dump Dalvik and native stack traces, return the trace file location (NULL if none) */
559const char *dump_traces() {
560    const char* result = NULL;
561
562    char traces_path[PROPERTY_VALUE_MAX] = "";
563    property_get("dalvik.vm.stack-trace-file", traces_path, "");
564    if (!traces_path[0]) return NULL;
565
566    /* move the old traces.txt (if any) out of the way temporarily */
567    char anr_traces_path[PATH_MAX];
568    strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path));
569    strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path));
570    if (rename(traces_path, anr_traces_path) && errno != ENOENT) {
571        fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno));
572        return NULL;  // Can't rename old traces.txt -- no permission? -- leave it alone instead
573    }
574
575    /* make the directory if necessary */
576    char anr_traces_dir[PATH_MAX];
577    strlcpy(anr_traces_dir, traces_path, sizeof(anr_traces_dir));
578    char *slash = strrchr(anr_traces_dir, '/');
579    if (slash != NULL) {
580        *slash = '\0';
581        if (!mkdir(anr_traces_dir, 0775)) {
582            chown(anr_traces_dir, AID_SYSTEM, AID_SYSTEM);
583            chmod(anr_traces_dir, 0775);
584            if (selinux_android_restorecon(anr_traces_dir, 0) == -1) {
585                fprintf(stderr, "restorecon failed for %s: %s\n", anr_traces_dir, strerror(errno));
586            }
587        } else if (errno != EEXIST) {
588            fprintf(stderr, "mkdir(%s): %s\n", anr_traces_dir, strerror(errno));
589            return NULL;
590        }
591    }
592
593    /* create a new, empty traces.txt file to receive stack dumps */
594    int fd = TEMP_FAILURE_RETRY(open(traces_path, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW,
595                                     0666));  /* -rw-rw-rw- */
596    if (fd < 0) {
597        fprintf(stderr, "%s: %s\n", traces_path, strerror(errno));
598        return NULL;
599    }
600    int chmod_ret = fchmod(fd, 0666);
601    if (chmod_ret < 0) {
602        fprintf(stderr, "fchmod on %s failed: %s\n", traces_path, strerror(errno));
603        close(fd);
604        return NULL;
605    }
606
607    /* walk /proc and kill -QUIT all Dalvik processes */
608    DIR *proc = opendir("/proc");
609    if (proc == NULL) {
610        fprintf(stderr, "/proc: %s\n", strerror(errno));
611        goto error_close_fd;
612    }
613
614    /* use inotify to find when processes are done dumping */
615    int ifd = inotify_init();
616    if (ifd < 0) {
617        fprintf(stderr, "inotify_init: %s\n", strerror(errno));
618        goto error_close_fd;
619    }
620
621    int wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE);
622    if (wfd < 0) {
623        fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno));
624        goto error_close_ifd;
625    }
626
627    struct dirent *d;
628    int dalvik_found = 0;
629    while ((d = readdir(proc))) {
630        int pid = atoi(d->d_name);
631        if (pid <= 0) continue;
632
633        char path[PATH_MAX];
634        char data[PATH_MAX];
635        snprintf(path, sizeof(path), "/proc/%d/exe", pid);
636        ssize_t len = readlink(path, data, sizeof(data) - 1);
637        if (len <= 0) {
638            continue;
639        }
640        data[len] = '\0';
641
642        if (!strncmp(data, "/system/bin/app_process", strlen("/system/bin/app_process"))) {
643            /* skip zygote -- it won't dump its stack anyway */
644            snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
645            int cfd = TEMP_FAILURE_RETRY(open(path, O_RDONLY));
646            len = read(cfd, data, sizeof(data) - 1);
647            close(cfd);
648            if (len <= 0) {
649                continue;
650            }
651            data[len] = '\0';
652            if (!strncmp(data, "zygote", strlen("zygote"))) {
653                continue;
654            }
655
656            ++dalvik_found;
657            uint64_t start = nanotime();
658            if (kill(pid, SIGQUIT)) {
659                fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno));
660                continue;
661            }
662
663            /* wait for the writable-close notification from inotify */
664            struct pollfd pfd = { ifd, POLLIN, 0 };
665            int ret = poll(&pfd, 1, 5000);  /* 5 sec timeout */
666            if (ret < 0) {
667                fprintf(stderr, "poll: %s\n", strerror(errno));
668            } else if (ret == 0) {
669                fprintf(stderr, "warning: timed out dumping pid %d\n", pid);
670            } else {
671                struct inotify_event ie;
672                read(ifd, &ie, sizeof(ie));
673            }
674
675            if (lseek(fd, 0, SEEK_END) < 0) {
676                fprintf(stderr, "lseek: %s\n", strerror(errno));
677            } else {
678                dprintf(fd, "[dump dalvik stack %d: %.3fs elapsed]\n",
679                        pid, (float)(nanotime() - start) / NANOS_PER_SEC);
680            }
681        } else if (should_dump_native_traces(data)) {
682            /* dump native process if appropriate */
683            if (lseek(fd, 0, SEEK_END) < 0) {
684                fprintf(stderr, "lseek: %s\n", strerror(errno));
685            } else {
686                static uint16_t timeout_failures = 0;
687                uint64_t start = nanotime();
688
689                /* If 3 backtrace dumps fail in a row, consider debuggerd dead. */
690                if (timeout_failures == 3) {
691                    dprintf(fd, "too many stack dump failures, skipping...\n");
692                } else if (dump_backtrace_to_file_timeout(pid, fd, 20) == -1) {
693                    dprintf(fd, "dumping failed, likely due to a timeout\n");
694                    timeout_failures++;
695                } else {
696                    timeout_failures = 0;
697                }
698                dprintf(fd, "[dump native stack %d: %.3fs elapsed]\n",
699                        pid, (float)(nanotime() - start) / NANOS_PER_SEC);
700            }
701        }
702    }
703
704    if (dalvik_found == 0) {
705        fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n");
706    }
707
708    static char dump_traces_path[PATH_MAX];
709    strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path));
710    strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path));
711    if (rename(traces_path, dump_traces_path)) {
712        fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno));
713        goto error_close_ifd;
714    }
715    result = dump_traces_path;
716
717    /* replace the saved [ANR] traces.txt file */
718    rename(anr_traces_path, traces_path);
719
720error_close_ifd:
721    close(ifd);
722error_close_fd:
723    close(fd);
724    return result;
725}
726
727void dump_route_tables() {
728    const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
729    dump_file("RT_TABLES", RT_TABLES_PATH);
730    FILE* fp = fopen(RT_TABLES_PATH, "r");
731    if (!fp) {
732        printf("*** %s: %s\n", RT_TABLES_PATH, strerror(errno));
733        return;
734    }
735    char table[16];
736    // Each line has an integer (the table number), a space, and a string (the table name). We only
737    // need the table number. It's a 32-bit unsigned number, so max 10 chars. Skip the table name.
738    // Add a fixed max limit so this doesn't go awry.
739    for (int i = 0; i < 64 && fscanf(fp, " %10s %*s", table) == 1; ++i) {
740        run_command("ROUTE TABLE IPv4", 10, "ip", "-4", "route", "show", "table", table, NULL);
741        run_command("ROUTE TABLE IPv6", 10, "ip", "-6", "route", "show", "table", table, NULL);
742    }
743    fclose(fp);
744}
745