utils.cpp revision 635ca31754ae734b0c540ac5600d58ae55cd4237 
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>
27#include <string.h>
28#include <sys/inotify.h>
29#include <sys/stat.h>
30#include <sys/time.h>
31#include <sys/wait.h>
32#include <sys/klog.h>
33#include <time.h>
34#include <unistd.h>
35#include <vector>
36#include <sys/prctl.h>
37
38#define LOG_TAG "dumpstate"
39#include <cutils/debugger.h>
40#include <cutils/log.h>
41#include <cutils/properties.h>
42#include <cutils/sockets.h>
43#include <private/android_filesystem_config.h>
44
45#include <selinux/android.h>
46
47#include "dumpstate.h"
48
49static const int64_t NANOS_PER_SEC = 1000000000;
50
51/* list of native processes to include in the native dumps */
52static const char* native_processes_to_dump[] = {
53        "/system/bin/audioserver",
54        "/system/bin/drmserver",
55        "/system/bin/mediaserver",
56        "/system/bin/sdcard",
57        "/system/bin/surfaceflinger",
58        "/system/bin/vehicle_network_service",
59        NULL,
60};
61
62DurationReporter::DurationReporter(const char *title) {
63    title_ = title;
64    if (title) {
65        started_ = DurationReporter::nanotime();
66    }
67}
68
69DurationReporter::~DurationReporter() {
70    if (title_) {
71        uint64_t elapsed = DurationReporter::nanotime() - started_;
72        // Use "Yoda grammar" to make it easier to grep|sort sections.
73        printf("------ %.3fs was the duration of '%s' ------\n",
74               (float) elapsed / NANOS_PER_SEC, title_);
75    }
76}
77
78uint64_t DurationReporter::DurationReporter::nanotime() {
79    struct timespec ts;
80    clock_gettime(CLOCK_MONOTONIC, &ts);
81    return (uint64_t) ts.tv_sec * NANOS_PER_SEC + ts.tv_nsec;
82}
83
84void for_each_userid(void (*func)(int), const char *header) {
85    ON_DRY_RUN_RETURN();
86    DIR *d;
87    struct dirent *de;
88
89    if (header) printf("\n------ %s ------\n", header);
90    func(0);
91
92    if (!(d = opendir("/data/system/users"))) {
93        printf("Failed to open /data/system/users (%s)\n", strerror(errno));
94        return;
95    }
96
97    while ((de = readdir(d))) {
98        int userid;
99        if (de->d_type != DT_DIR || !(userid = atoi(de->d_name))) {
100            continue;
101        }
102        func(userid);
103    }
104
105    closedir(d);
106}
107
108static void __for_each_pid(void (*helper)(int, const char *, void *), const char *header, void *arg) {
109    DIR *d;
110    struct dirent *de;
111
112    if (!(d = opendir("/proc"))) {
113        printf("Failed to open /proc (%s)\n", strerror(errno));
114        return;
115    }
116
117    if (header) printf("\n------ %s ------\n", header);
118    while ((de = readdir(d))) {
119        int pid;
120        int fd;
121        char cmdpath[255];
122        char cmdline[255];
123
124        if (!(pid = atoi(de->d_name))) {
125            continue;
126        }
127
128        sprintf(cmdpath,"/proc/%d/cmdline", pid);
129        memset(cmdline, 0, sizeof(cmdline));
130        if ((fd = TEMP_FAILURE_RETRY(open(cmdpath, O_RDONLY | O_CLOEXEC))) < 0) {
131            strcpy(cmdline, "N/A");
132        } else {
133            read(fd, cmdline, sizeof(cmdline) - 1);
134            close(fd);
135        }
136        helper(pid, cmdline, arg);
137    }
138
139    closedir(d);
140}
141
142static void for_each_pid_helper(int pid, const char *cmdline, void *arg) {
143    for_each_pid_func *func = (for_each_pid_func*) arg;
144    func(pid, cmdline);
145}
146
147void for_each_pid(for_each_pid_func func, const char *header) {
148    ON_DRY_RUN_RETURN();
149  __for_each_pid(for_each_pid_helper, header, (void *)func);
150}
151
152static void for_each_tid_helper(int pid, const char *cmdline, void *arg) {
153    DIR *d;
154    struct dirent *de;
155    char taskpath[255];
156    for_each_tid_func *func = (for_each_tid_func *) arg;
157
158    sprintf(taskpath, "/proc/%d/task", pid);
159
160    if (!(d = opendir(taskpath))) {
161        printf("Failed to open %s (%s)\n", taskpath, strerror(errno));
162        return;
163    }
164
165    func(pid, pid, cmdline);
166
167    while ((de = readdir(d))) {
168        int tid;
169        int fd;
170        char commpath[255];
171        char comm[255];
172
173        if (!(tid = atoi(de->d_name))) {
174            continue;
175        }
176
177        if (tid == pid)
178            continue;
179
180        sprintf(commpath,"/proc/%d/comm", tid);
181        memset(comm, 0, sizeof(comm));
182        if ((fd = TEMP_FAILURE_RETRY(open(commpath, O_RDONLY | O_CLOEXEC))) < 0) {
183            strcpy(comm, "N/A");
184        } else {
185            char *c;
186            read(fd, comm, sizeof(comm) - 1);
187            close(fd);
188
189            c = strrchr(comm, '\n');
190            if (c) {
191                *c = '\0';
192            }
193        }
194        func(pid, tid, comm);
195    }
196
197    closedir(d);
198}
199
200void for_each_tid(for_each_tid_func func, const char *header) {
201    ON_DRY_RUN_RETURN();
202    __for_each_pid(for_each_tid_helper, header, (void *) func);
203}
204
205void show_wchan(int pid, int tid, const char *name) {
206    ON_DRY_RUN_RETURN();
207    char path[255];
208    char buffer[255];
209    int fd;
210    char name_buffer[255];
211
212    memset(buffer, 0, sizeof(buffer));
213
214    sprintf(path, "/proc/%d/wchan", tid);
215    if ((fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_CLOEXEC))) < 0) {
216        printf("Failed to open '%s' (%s)\n", path, strerror(errno));
217        return;
218    }
219
220    if (read(fd, buffer, sizeof(buffer)) < 0) {
221        printf("Failed to read '%s' (%s)\n", path, strerror(errno));
222        goto out_close;
223    }
224
225    snprintf(name_buffer, sizeof(name_buffer), "%*s%s",
226             pid == tid ? 0 : 3, "", name);
227
228    printf("%-7d %-32s %s\n", tid, name_buffer, buffer);
229
230out_close:
231    close(fd);
232    return;
233}
234
235void do_dmesg() {
236    const char *title = "KERNEL LOG (dmesg)";
237    DurationReporter duration_reporter(title);
238    printf("------ %s ------\n", title);
239
240    ON_DRY_RUN_RETURN();
241    /* Get size of kernel buffer */
242    int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0);
243    if (size <= 0) {
244        printf("Unexpected klogctl return value: %d\n\n", size);
245        return;
246    }
247    char *buf = (char *) malloc(size + 1);
248    if (buf == NULL) {
249        printf("memory allocation failed\n\n");
250        return;
251    }
252    int retval = klogctl(KLOG_READ_ALL, buf, size);
253    if (retval < 0) {
254        printf("klogctl failure\n\n");
255        free(buf);
256        return;
257    }
258    buf[retval] = '\0';
259    printf("%s\n\n", buf);
260    free(buf);
261    return;
262}
263
264void do_showmap(int pid, const char *name) {
265    char title[255];
266    char arg[255];
267
268    sprintf(title, "SHOW MAP %d (%s)", pid, name);
269    sprintf(arg, "%d", pid);
270    run_command(title, 10, SU_PATH, "root", "showmap", arg, NULL);
271}
272
273static int _dump_file_from_fd(const char *title, const char *path, int fd) {
274    if (title) {
275        printf("------ %s (%s", title, path);
276
277        struct stat st;
278        // Only show the modification time of non-device files.
279        size_t path_len = strlen(path);
280        if ((path_len < 6 || memcmp(path, "/proc/", 6)) &&
281                (path_len < 5 || memcmp(path, "/sys/", 5)) &&
282                (path_len < 3 || memcmp(path, "/d/", 3)) &&
283                !fstat(fd, &st)) {
284            char stamp[80];
285            time_t mtime = st.st_mtime;
286            strftime(stamp, sizeof(stamp), "%Y-%m-%d %H:%M:%S", localtime(&mtime));
287            printf(": %s", stamp);
288        }
289        printf(") ------\n");
290    }
291    ON_DRY_RUN({ update_progress(WEIGHT_FILE); close(fd); return 0; });
292
293    bool newline = false;
294    fd_set read_set;
295    struct timeval tm;
296    while (1) {
297        FD_ZERO(&read_set);
298        FD_SET(fd, &read_set);
299        /* Timeout if no data is read for 30 seconds. */
300        tm.tv_sec = 30;
301        tm.tv_usec = 0;
302        uint64_t elapsed = DurationReporter::nanotime();
303        int ret = TEMP_FAILURE_RETRY(select(fd + 1, &read_set, NULL, NULL, &tm));
304        if (ret == -1) {
305            printf("*** %s: select failed: %s\n", path, strerror(errno));
306            newline = true;
307            break;
308        } else if (ret == 0) {
309            elapsed = DurationReporter::nanotime() - elapsed;
310            printf("*** %s: Timed out after %.3fs\n", path,
311                   (float) elapsed / NANOS_PER_SEC);
312            newline = true;
313            break;
314        } else {
315            char buffer[65536];
316            ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, sizeof(buffer)));
317            if (bytes_read > 0) {
318                fwrite(buffer, bytes_read, 1, stdout);
319                newline = (buffer[bytes_read-1] == '\n');
320            } else {
321                if (bytes_read == -1) {
322                    printf("*** %s: Failed to read from fd: %s", path, strerror(errno));
323                    newline = true;
324                }
325                break;
326            }
327        }
328    }
329    update_progress(WEIGHT_FILE);
330    close(fd);
331
332    if (!newline) printf("\n");
333    if (title) printf("\n");
334    return 0;
335}
336
337/* prints the contents of a file */
338int dump_file(const char *title, const char *path) {
339    DurationReporter duration_reporter(title);
340    int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC));
341    if (fd < 0) {
342        int err = errno;
343        printf("*** %s: %s\n", path, strerror(err));
344        if (title) printf("\n");
345        return -1;
346    }
347    return _dump_file_from_fd(title, path, fd);
348}
349
350/* calls skip to gate calling dump_from_fd recursively
351 * in the specified directory. dump_from_fd defaults to
352 * dump_file_from_fd above when set to NULL. skip defaults
353 * to false when set to NULL. dump_from_fd will always be
354 * called with title NULL.
355 */
356int dump_files(const char *title, const char *dir,
357        bool (*skip)(const char *path),
358        int (*dump_from_fd)(const char *title, const char *path, int fd)) {
359    DurationReporter duration_reporter(title);
360    DIR *dirp;
361    struct dirent *d;
362    char *newpath = NULL;
363    const char *slash = "/";
364    int fd, retval = 0;
365
366    if (title) {
367        printf("------ %s (%s) ------\n", title, dir);
368    }
369    ON_DRY_RUN_RETURN(0);
370
371    if (dir[strlen(dir) - 1] == '/') {
372        ++slash;
373    }
374    dirp = opendir(dir);
375    if (dirp == NULL) {
376        retval = -errno;
377        fprintf(stderr, "%s: %s\n", dir, strerror(errno));
378        return retval;
379    }
380
381    if (!dump_from_fd) {
382        dump_from_fd = dump_file_from_fd;
383    }
384    for (; ((d = readdir(dirp))); free(newpath), newpath = NULL) {
385        if ((d->d_name[0] == '.')
386         && (((d->d_name[1] == '.') && (d->d_name[2] == '\0'))
387          || (d->d_name[1] == '\0'))) {
388            continue;
389        }
390        asprintf(&newpath, "%s%s%s%s", dir, slash, d->d_name,
391                 (d->d_type == DT_DIR) ? "/" : "");
392        if (!newpath) {
393            retval = -errno;
394            continue;
395        }
396        if (skip && (*skip)(newpath)) {
397            continue;
398        }
399        if (d->d_type == DT_DIR) {
400            int ret = dump_files(NULL, newpath, skip, dump_from_fd);
401            if (ret < 0) {
402                retval = ret;
403            }
404            continue;
405        }
406        fd = TEMP_FAILURE_RETRY(open(newpath, O_RDONLY | O_NONBLOCK | O_CLOEXEC));
407        if (fd < 0) {
408            retval = fd;
409            printf("*** %s: %s\n", newpath, strerror(errno));
410            continue;
411        }
412        (*dump_from_fd)(NULL, newpath, fd);
413    }
414    closedir(dirp);
415    if (title) {
416        printf("\n");
417    }
418    return retval;
419}
420
421/* fd must have been opened with the flag O_NONBLOCK. With this flag set,
422 * it's possible to avoid issues where opening the file itself can get
423 * stuck.
424 */
425int dump_file_from_fd(const char *title, const char *path, int fd) {
426    int flags = fcntl(fd, F_GETFL);
427    if (flags == -1) {
428        printf("*** %s: failed to get flags on fd %d: %s\n", path, fd, strerror(errno));
429        close(fd);
430        return -1;
431    } else if (!(flags & O_NONBLOCK)) {
432        printf("*** %s: fd must have O_NONBLOCK set.\n", path);
433        close(fd);
434        return -1;
435    }
436    return _dump_file_from_fd(title, path, fd);
437}
438
439bool waitpid_with_timeout(pid_t pid, int timeout_seconds, int* status) {
440    sigset_t child_mask, old_mask;
441    sigemptyset(&child_mask);
442    sigaddset(&child_mask, SIGCHLD);
443
444    if (sigprocmask(SIG_BLOCK, &child_mask, &old_mask) == -1) {
445        printf("*** sigprocmask failed: %s\n", strerror(errno));
446        return false;
447    }
448
449    struct timespec ts;
450    ts.tv_sec = timeout_seconds;
451    ts.tv_nsec = 0;
452    int ret = TEMP_FAILURE_RETRY(sigtimedwait(&child_mask, NULL, &ts));
453    int saved_errno = errno;
454    // Set the signals back the way they were.
455    if (sigprocmask(SIG_SETMASK, &old_mask, NULL) == -1) {
456        printf("*** sigprocmask failed: %s\n", strerror(errno));
457        if (ret == 0) {
458            return false;
459        }
460    }
461    if (ret == -1) {
462        errno = saved_errno;
463        if (errno == EAGAIN) {
464            errno = ETIMEDOUT;
465        } else {
466            printf("*** sigtimedwait failed: %s\n", strerror(errno));
467        }
468        return false;
469    }
470
471    pid_t child_pid = waitpid(pid, status, WNOHANG);
472    if (child_pid != pid) {
473        if (child_pid != -1) {
474            printf("*** Waiting for pid %d, got pid %d instead\n", pid, child_pid);
475        } else {
476            printf("*** waitpid failed: %s\n", strerror(errno));
477        }
478        return false;
479    }
480    return true;
481}
482
483int run_command(const char *title, int timeout_seconds, const char *command, ...) {
484    DurationReporter duration_reporter(title);
485    fflush(stdout);
486
487    const char *args[1024] = {command};
488    size_t arg;
489    va_list ap;
490    va_start(ap, command);
491    if (title) printf("------ %s (%s", title, command);
492    for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) {
493        args[arg] = va_arg(ap, const char *);
494        if (args[arg] == NULL) break;
495        if (title) printf(" %s", args[arg]);
496    }
497    if (title) printf(") ------\n");
498    fflush(stdout);
499
500    ON_DRY_RUN({ update_progress(timeout_seconds); va_end(ap); return 0; });
501
502    int status = run_command_always(title, timeout_seconds, args);
503    va_end(ap);
504    return status;
505}
506
507/* forks a command and waits for it to finish */
508int run_command_always(const char *title, int timeout_seconds, const char *args[]) {
509    /* TODO: for now we're simplifying the progress calculation by using the timeout as the weight.
510     * It's a good approximation for most cases, except when calling dumpsys, where its weight
511     * should be much higher proportionally to its timeout. */
512    int weight = timeout_seconds;
513
514    const char *command = args[0];
515    uint64_t start = DurationReporter::nanotime();
516    pid_t pid = fork();
517
518    /* handle error case */
519    if (pid < 0) {
520        printf("*** fork: %s\n", strerror(errno));
521        return pid;
522    }
523
524    /* handle child case */
525    if (pid == 0) {
526
527        /* make sure the child dies when dumpstate dies */
528        prctl(PR_SET_PDEATHSIG, SIGKILL);
529
530        /* just ignore SIGPIPE, will go down with parent's */
531        struct sigaction sigact;
532        memset(&sigact, 0, sizeof(sigact));
533        sigact.sa_handler = SIG_IGN;
534        sigaction(SIGPIPE, &sigact, NULL);
535
536        execvp(command, (char**) args);
537        printf("*** exec(%s): %s\n", command, strerror(errno));
538        fflush(stdout);
539        _exit(-1);
540    }
541
542    /* handle parent case */
543    int status;
544    bool ret = waitpid_with_timeout(pid, timeout_seconds, &status);
545    uint64_t elapsed = DurationReporter::nanotime() - start;
546    if (!ret) {
547        if (errno == ETIMEDOUT) {
548            printf("*** %s: Timed out after %.3fs (killing pid %d)\n", command,
549                   (float) elapsed / NANOS_PER_SEC, pid);
550        } else {
551            printf("*** %s: Error after %.4fs (killing pid %d)\n", command,
552                   (float) elapsed / NANOS_PER_SEC, pid);
553        }
554        kill(pid, SIGTERM);
555        if (!waitpid_with_timeout(pid, 5, NULL)) {
556            kill(pid, SIGKILL);
557            if (!waitpid_with_timeout(pid, 5, NULL)) {
558                printf("*** %s: Cannot kill %d even with SIGKILL.\n", command, pid);
559            }
560        }
561        return -1;
562    }
563
564    if (WIFSIGNALED(status)) {
565        printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status));
566    } else if (WIFEXITED(status) && WEXITSTATUS(status) > 0) {
567        printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status));
568    }
569    if (title) printf("[%s: %.3fs elapsed]\n\n", command, (float)elapsed / NANOS_PER_SEC);
570
571    if (weight > 0) {
572        update_progress(weight);
573    }
574    return status;
575}
576
577void send_broadcast(const std::string& action, const std::vector<std::string>& args) {
578    if (args.size() > 1000) {
579        fprintf(stderr, "send_broadcast: too many arguments (%d)\n", (int) args.size());
580        return;
581    }
582    const char *am_args[1024] = { "/system/bin/am", "broadcast", "--user", "0",
583                                  "-a", action.c_str() };
584    size_t am_index = 5; // Starts at the index of last initial value above.
585    for (const std::string& arg : args) {
586        am_args[++am_index] = arg.c_str();
587    }
588    // Always terminate with NULL.
589    am_args[am_index + 1] = NULL;
590    run_command_always(NULL, 5, am_args);
591}
592
593size_t num_props = 0;
594static char* props[2000];
595
596static void print_prop(const char *key, const char *name, void *user) {
597    (void) user;
598    if (num_props < sizeof(props) / sizeof(props[0])) {
599        char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10];
600        snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name);
601        props[num_props++] = strdup(buf);
602    }
603}
604
605static int compare_prop(const void *a, const void *b) {
606    return strcmp(*(char * const *) a, *(char * const *) b);
607}
608
609/* prints all the system properties */
610void print_properties() {
611    const char* title = "SYSTEM PROPERTIES";
612    DurationReporter duration_reporter(title);
613    printf("------ %s ------\n", title);
614    ON_DRY_RUN_RETURN();
615    size_t i;
616    num_props = 0;
617    property_list(print_prop, NULL);
618    qsort(&props, num_props, sizeof(props[0]), compare_prop);
619
620    for (i = 0; i < num_props; ++i) {
621        fputs(props[i], stdout);
622        free(props[i]);
623    }
624    printf("\n");
625}
626
627/* redirect output to a service control socket */
628void redirect_to_socket(FILE *redirect, const char *service) {
629    int s = android_get_control_socket(service);
630    if (s < 0) {
631        fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno));
632        exit(1);
633    }
634    fcntl(s, F_SETFD, FD_CLOEXEC);
635    if (listen(s, 4) < 0) {
636        fprintf(stderr, "listen(control socket): %s\n", strerror(errno));
637        exit(1);
638    }
639
640    struct sockaddr addr;
641    socklen_t alen = sizeof(addr);
642    int fd = accept(s, &addr, &alen);
643    if (fd < 0) {
644        fprintf(stderr, "accept(control socket): %s\n", strerror(errno));
645        exit(1);
646    }
647
648    fflush(redirect);
649    dup2(fd, fileno(redirect));
650    close(fd);
651}
652
653/* redirect output to a file */
654void redirect_to_file(FILE *redirect, char *path) {
655    char *chp = path;
656
657    /* skip initial slash */
658    if (chp[0] == '/')
659        chp++;
660
661    /* create leading directories, if necessary */
662    while (chp && chp[0]) {
663        chp = strchr(chp, '/');
664        if (chp) {
665            *chp = 0;
666            mkdir(path, 0770);  /* drwxrwx--- */
667            *chp++ = '/';
668        }
669    }
670
671    int fd = TEMP_FAILURE_RETRY(open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
672                                     S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH));
673    if (fd < 0) {
674        fprintf(stderr, "%s: %s\n", path, strerror(errno));
675        exit(1);
676    }
677
678    TEMP_FAILURE_RETRY(dup2(fd, fileno(redirect)));
679    close(fd);
680}
681
682static bool should_dump_native_traces(const char* path) {
683    for (const char** p = native_processes_to_dump; *p; p++) {
684        if (!strcmp(*p, path)) {
685            return true;
686        }
687    }
688    return false;
689}
690
691/* dump Dalvik and native stack traces, return the trace file location (NULL if none) */
692const char *dump_traces() {
693    DurationReporter duration_reporter("DUMP TRACES");
694    ON_DRY_RUN_RETURN(NULL);
695    const char* result = NULL;
696
697    char traces_path[PROPERTY_VALUE_MAX] = "";
698    property_get("dalvik.vm.stack-trace-file", traces_path, "");
699    if (!traces_path[0]) return NULL;
700
701    /* move the old traces.txt (if any) out of the way temporarily */
702    char anr_traces_path[PATH_MAX];
703    strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path));
704    strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path));
705    if (rename(traces_path, anr_traces_path) && errno != ENOENT) {
706        fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno));
707        return NULL;  // Can't rename old traces.txt -- no permission? -- leave it alone instead
708    }
709
710    /* create a new, empty traces.txt file to receive stack dumps */
711    int fd = TEMP_FAILURE_RETRY(open(traces_path, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW | O_CLOEXEC,
712                                     0666));  /* -rw-rw-rw- */
713    if (fd < 0) {
714        fprintf(stderr, "%s: %s\n", traces_path, strerror(errno));
715        return NULL;
716    }
717    int chmod_ret = fchmod(fd, 0666);
718    if (chmod_ret < 0) {
719        fprintf(stderr, "fchmod on %s failed: %s\n", traces_path, strerror(errno));
720        close(fd);
721        return NULL;
722    }
723
724    /* Variables below must be initialized before 'goto' statements */
725    int dalvik_found = 0;
726    int ifd, wfd = -1;
727
728    /* walk /proc and kill -QUIT all Dalvik processes */
729    DIR *proc = opendir("/proc");
730    if (proc == NULL) {
731        fprintf(stderr, "/proc: %s\n", strerror(errno));
732        goto error_close_fd;
733    }
734
735    /* use inotify to find when processes are done dumping */
736    ifd = inotify_init();
737    if (ifd < 0) {
738        fprintf(stderr, "inotify_init: %s\n", strerror(errno));
739        goto error_close_fd;
740    }
741
742    wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE);
743    if (wfd < 0) {
744        fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno));
745        goto error_close_ifd;
746    }
747
748    struct dirent *d;
749    while ((d = readdir(proc))) {
750        int pid = atoi(d->d_name);
751        if (pid <= 0) continue;
752
753        char path[PATH_MAX];
754        char data[PATH_MAX];
755        snprintf(path, sizeof(path), "/proc/%d/exe", pid);
756        ssize_t len = readlink(path, data, sizeof(data) - 1);
757        if (len <= 0) {
758            continue;
759        }
760        data[len] = '\0';
761
762        if (!strncmp(data, "/system/bin/app_process", strlen("/system/bin/app_process"))) {
763            /* skip zygote -- it won't dump its stack anyway */
764            snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
765            int cfd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_CLOEXEC));
766            len = read(cfd, data, sizeof(data) - 1);
767            close(cfd);
768            if (len <= 0) {
769                continue;
770            }
771            data[len] = '\0';
772            if (!strncmp(data, "zygote", strlen("zygote"))) {
773                continue;
774            }
775
776            ++dalvik_found;
777            uint64_t start = DurationReporter::nanotime();
778            if (kill(pid, SIGQUIT)) {
779                fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno));
780                continue;
781            }
782
783            /* wait for the writable-close notification from inotify */
784            struct pollfd pfd = { ifd, POLLIN, 0 };
785            int ret = poll(&pfd, 1, 5000);  /* 5 sec timeout */
786            if (ret < 0) {
787                fprintf(stderr, "poll: %s\n", strerror(errno));
788            } else if (ret == 0) {
789                fprintf(stderr, "warning: timed out dumping pid %d\n", pid);
790            } else {
791                struct inotify_event ie;
792                read(ifd, &ie, sizeof(ie));
793            }
794
795            if (lseek(fd, 0, SEEK_END) < 0) {
796                fprintf(stderr, "lseek: %s\n", strerror(errno));
797            } else {
798                dprintf(fd, "[dump dalvik stack %d: %.3fs elapsed]\n",
799                        pid, (float)(DurationReporter::nanotime() - start) / NANOS_PER_SEC);
800            }
801        } else if (should_dump_native_traces(data)) {
802            /* dump native process if appropriate */
803            if (lseek(fd, 0, SEEK_END) < 0) {
804                fprintf(stderr, "lseek: %s\n", strerror(errno));
805            } else {
806                static uint16_t timeout_failures = 0;
807                uint64_t start = DurationReporter::nanotime();
808
809                /* If 3 backtrace dumps fail in a row, consider debuggerd dead. */
810                if (timeout_failures == 3) {
811                    dprintf(fd, "too many stack dump failures, skipping...\n");
812                } else if (dump_backtrace_to_file_timeout(pid, fd, 20) == -1) {
813                    dprintf(fd, "dumping failed, likely due to a timeout\n");
814                    timeout_failures++;
815                } else {
816                    timeout_failures = 0;
817                }
818                dprintf(fd, "[dump native stack %d: %.3fs elapsed]\n",
819                        pid, (float)(DurationReporter::nanotime() - start) / NANOS_PER_SEC);
820            }
821        }
822    }
823
824    if (dalvik_found == 0) {
825        fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n");
826    }
827
828    static char dump_traces_path[PATH_MAX];
829    strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path));
830    strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path));
831    if (rename(traces_path, dump_traces_path)) {
832        fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno));
833        goto error_close_ifd;
834    }
835    result = dump_traces_path;
836
837    /* replace the saved [ANR] traces.txt file */
838    rename(anr_traces_path, traces_path);
839
840error_close_ifd:
841    close(ifd);
842error_close_fd:
843    close(fd);
844    return result;
845}
846
847void dump_route_tables() {
848    DurationReporter duration_reporter("DUMP ROUTE TABLES");
849    ON_DRY_RUN_RETURN();
850    const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
851    dump_file("RT_TABLES", RT_TABLES_PATH);
852    FILE* fp = fopen(RT_TABLES_PATH, "re");
853    if (!fp) {
854        printf("*** %s: %s\n", RT_TABLES_PATH, strerror(errno));
855        return;
856    }
857    char table[16];
858    // Each line has an integer (the table number), a space, and a string (the table name). We only
859    // need the table number. It's a 32-bit unsigned number, so max 10 chars. Skip the table name.
860    // Add a fixed max limit so this doesn't go awry.
861    for (int i = 0; i < 64 && fscanf(fp, " %10s %*s", table) == 1; ++i) {
862        run_command("ROUTE TABLE IPv4", 10, "ip", "-4", "route", "show", "table", table, NULL);
863        run_command("ROUTE TABLE IPv6", 10, "ip", "-6", "route", "show", "table", table, NULL);
864    }
865    fclose(fp);
866}
867
868/* overall progress */
869int progress = 0;
870int do_update_progress = 0; // Set by dumpstate.cpp
871int weight_total = WEIGHT_TOTAL;
872
873// TODO: make this function thread safe if sections are generated in parallel.
874void update_progress(int delta) {
875    if (!do_update_progress) return;
876
877    progress += delta;
878
879    char key[PROPERTY_KEY_MAX];
880    char value[PROPERTY_VALUE_MAX];
881
882    // adjusts max on the fly
883    if (progress > weight_total) {
884        int new_total = weight_total * 1.2;
885        fprintf(stderr, "Adjusting total weight from %d to %d\n", weight_total, new_total);
886        weight_total = new_total;
887        sprintf(key, "dumpstate.%d.max", getpid());
888        sprintf(value, "%d", weight_total);
889        int status = property_set(key, value);
890        if (status) {
891            ALOGW("Could not update max weight by setting system property %s to %s: %d\n",
892                    key, value, status);
893        }
894    }
895
896    sprintf(key, "dumpstate.%d.progress", getpid());
897    sprintf(value, "%d", progress);
898
899    // stderr is ignored on normal invocations, but useful when calling /system/bin/dumpstate
900    // directly for debuggging.
901    fprintf(stderr, "Setting progress (%s): %s/%d\n", key, value, weight_total);
902
903    int status = property_set(key, value);
904    if (status) {
905        ALOGW("Could not update progress by setting system property %s to %s: %d\n",
906                key, value, status);
907    }
908}
909
910void take_screenshot(const std::string& path) {
911    const char *args[] = { "/system/bin/screencap", "-p", path.c_str(), NULL };
912    run_command_always(NULL, 10, args);
913}
914
915void vibrate(FILE* vibrator, int ms) {
916    fprintf(vibrator, "%d\n", ms);
917    fflush(vibrator);
918}
919
920bool is_dir(const char* pathname) {
921    struct stat info;
922    if (stat(pathname, &info) == -1) {
923        return false;
924    }
925    return S_ISDIR(info.st_mode);
926}
927
928time_t get_mtime(int fd, time_t default_mtime) {
929    struct stat info;
930    if (fstat(fd, &info) == -1) {
931        return default_mtime;
932    }
933    return info.st_mtime;
934}
935
936void dump_emmc_ecsd(const char *ext_csd_path) {
937    static const size_t EXT_CSD_REV = 192;
938    static const size_t EXT_PRE_EOL_INFO = 267;
939    static const size_t EXT_DEVICE_LIFE_TIME_EST_TYP_A = 268;
940    static const size_t EXT_DEVICE_LIFE_TIME_EST_TYP_B = 269;
941    struct hex {
942        char str[2];
943    } buffer[512];
944    int fd, ext_csd_rev, ext_pre_eol_info;
945    ssize_t bytes_read;
946    static const char *ver_str[] = {
947        "4.0", "4.1", "4.2", "4.3", "Obsolete", "4.41", "4.5", "5.0"
948    };
949    static const char *eol_str[] = {
950        "Undefined",
951        "Normal",
952        "Warning (consumed 80% of reserve)",
953        "Urgent (consumed 90% of reserve)"
954    };
955
956    printf("------ %s Extended CSD ------\n", ext_csd_path);
957
958    fd = TEMP_FAILURE_RETRY(open(ext_csd_path,
959                                 O_RDONLY | O_NONBLOCK | O_CLOEXEC));
960    if (fd < 0) {
961        printf("*** %s: %s\n\n", ext_csd_path, strerror(errno));
962        return;
963    }
964
965    bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, sizeof(buffer)));
966    close(fd);
967    if (bytes_read < 0) {
968        printf("*** %s: %s\n\n", ext_csd_path, strerror(errno));
969        return;
970    }
971    if (bytes_read < (ssize_t)(EXT_CSD_REV * sizeof(struct hex))) {
972        printf("*** %s: truncated content %zd\n\n", ext_csd_path, bytes_read);
973        return;
974    }
975
976    ext_csd_rev = 0;
977    if (sscanf(buffer[EXT_CSD_REV].str, "%02x", &ext_csd_rev) != 1) {
978        printf("*** %s: EXT_CSD_REV parse error \"%.2s\"\n\n",
979               ext_csd_path, buffer[EXT_CSD_REV].str);
980        return;
981    }
982
983    printf("rev 1.%d (MMC %s)\n",
984           ext_csd_rev,
985           (ext_csd_rev < (int)(sizeof(ver_str) / sizeof(ver_str[0]))) ?
986               ver_str[ext_csd_rev] :
987               "Unknown");
988    if (ext_csd_rev < 7) {
989        printf("\n");
990        return;
991    }
992
993    if (bytes_read < (ssize_t)(EXT_PRE_EOL_INFO * sizeof(struct hex))) {
994        printf("*** %s: truncated content %zd\n\n", ext_csd_path, bytes_read);
995        return;
996    }
997
998    ext_pre_eol_info = 0;
999    if (sscanf(buffer[EXT_PRE_EOL_INFO].str, "%02x", &ext_pre_eol_info) != 1) {
1000        printf("*** %s: PRE_EOL_INFO parse error \"%.2s\"\n\n",
1001               ext_csd_path, buffer[EXT_PRE_EOL_INFO].str);
1002        return;
1003    }
1004    printf("PRE_EOL_INFO %d (MMC %s)\n",
1005           ext_pre_eol_info,
1006           eol_str[(ext_pre_eol_info < (int)
1007                       (sizeof(eol_str) / sizeof(eol_str[0]))) ?
1008                           ext_pre_eol_info : 0]);
1009
1010    for (size_t lifetime = EXT_DEVICE_LIFE_TIME_EST_TYP_A;
1011            lifetime <= EXT_DEVICE_LIFE_TIME_EST_TYP_B;
1012            ++lifetime) {
1013        int ext_device_life_time_est;
1014        static const char *est_str[] = {
1015            "Undefined",
1016            "0-10% of device lifetime used",
1017            "10-20% of device lifetime used",
1018            "20-30% of device lifetime used",
1019            "30-40% of device lifetime used",
1020            "40-50% of device lifetime used",
1021            "50-60% of device lifetime used",
1022            "60-70% of device lifetime used",
1023            "70-80% of device lifetime used",
1024            "80-90% of device lifetime used",
1025            "90-100% of device lifetime used",
1026            "Exceeded the maximum estimated device lifetime",
1027        };
1028
1029        if (bytes_read < (ssize_t)(lifetime * sizeof(struct hex))) {
1030            printf("*** %s: truncated content %zd\n", ext_csd_path, bytes_read);
1031            break;
1032        }
1033
1034        ext_device_life_time_est = 0;
1035        if (sscanf(buffer[lifetime].str, "%02x", &ext_device_life_time_est) != 1) {
1036            printf("*** %s: DEVICE_LIFE_TIME_EST_TYP_%c parse error \"%.2s\"\n",
1037                   ext_csd_path,
1038                   (unsigned)(lifetime - EXT_DEVICE_LIFE_TIME_EST_TYP_A) + 'A',
1039                   buffer[lifetime].str);
1040            continue;
1041        }
1042        printf("DEVICE_LIFE_TIME_EST_TYP_%c %d (MMC %s)\n",
1043               (unsigned)(lifetime - EXT_DEVICE_LIFE_TIME_EST_TYP_A) + 'A',
1044               ext_device_life_time_est,
1045               est_str[(ext_device_life_time_est < (int)
1046                           (sizeof(est_str) / sizeof(est_str[0]))) ?
1047                               ext_device_life_time_est : 0]);
1048    }
1049
1050    printf("\n");
1051}
1052