utils.cpp revision 9609bbd79668dbc3c8c16c773c92637de98bfa70 
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
62static uint64_t nanotime() {
63    struct timespec ts;
64    clock_gettime(CLOCK_MONOTONIC, &ts);
65    return (uint64_t)ts.tv_sec * NANOS_PER_SEC + ts.tv_nsec;
66}
67
68void for_each_userid(void (*func)(int), const char *header) {
69    ON_DRY_RUN_RETURN();
70    DIR *d;
71    struct dirent *de;
72
73    if (header) printf("\n------ %s ------\n", header);
74    func(0);
75
76    if (!(d = opendir("/data/system/users"))) {
77        printf("Failed to open /data/system/users (%s)\n", strerror(errno));
78        return;
79    }
80
81    while ((de = readdir(d))) {
82        int userid;
83        if (de->d_type != DT_DIR || !(userid = atoi(de->d_name))) {
84            continue;
85        }
86        func(userid);
87    }
88
89    closedir(d);
90}
91
92static void __for_each_pid(void (*helper)(int, const char *, void *), const char *header, void *arg) {
93    DIR *d;
94    struct dirent *de;
95
96    if (!(d = opendir("/proc"))) {
97        printf("Failed to open /proc (%s)\n", strerror(errno));
98        return;
99    }
100
101    printf("\n------ %s ------\n", header);
102    while ((de = readdir(d))) {
103        int pid;
104        int fd;
105        char cmdpath[255];
106        char cmdline[255];
107
108        if (!(pid = atoi(de->d_name))) {
109            continue;
110        }
111
112        sprintf(cmdpath,"/proc/%d/cmdline", pid);
113        memset(cmdline, 0, sizeof(cmdline));
114        if ((fd = TEMP_FAILURE_RETRY(open(cmdpath, O_RDONLY | O_CLOEXEC))) < 0) {
115            strcpy(cmdline, "N/A");
116        } else {
117            read(fd, cmdline, sizeof(cmdline) - 1);
118            close(fd);
119        }
120        helper(pid, cmdline, arg);
121    }
122
123    closedir(d);
124}
125
126static void for_each_pid_helper(int pid, const char *cmdline, void *arg) {
127    for_each_pid_func *func = (for_each_pid_func*) arg;
128    func(pid, cmdline);
129}
130
131void for_each_pid(for_each_pid_func func, const char *header) {
132    ON_DRY_RUN_RETURN();
133  __for_each_pid(for_each_pid_helper, header, (void *)func);
134}
135
136static void for_each_tid_helper(int pid, const char *cmdline, void *arg) {
137    DIR *d;
138    struct dirent *de;
139    char taskpath[255];
140    for_each_tid_func *func = (for_each_tid_func *) arg;
141
142    sprintf(taskpath, "/proc/%d/task", pid);
143
144    if (!(d = opendir(taskpath))) {
145        printf("Failed to open %s (%s)\n", taskpath, strerror(errno));
146        return;
147    }
148
149    func(pid, pid, cmdline);
150
151    while ((de = readdir(d))) {
152        int tid;
153        int fd;
154        char commpath[255];
155        char comm[255];
156
157        if (!(tid = atoi(de->d_name))) {
158            continue;
159        }
160
161        if (tid == pid)
162            continue;
163
164        sprintf(commpath,"/proc/%d/comm", tid);
165        memset(comm, 0, sizeof(comm));
166        if ((fd = TEMP_FAILURE_RETRY(open(commpath, O_RDONLY | O_CLOEXEC))) < 0) {
167            strcpy(comm, "N/A");
168        } else {
169            char *c;
170            read(fd, comm, sizeof(comm) - 1);
171            close(fd);
172
173            c = strrchr(comm, '\n');
174            if (c) {
175                *c = '\0';
176            }
177        }
178        func(pid, tid, comm);
179    }
180
181    closedir(d);
182}
183
184void for_each_tid(for_each_tid_func func, const char *header) {
185    ON_DRY_RUN_RETURN();
186    __for_each_pid(for_each_tid_helper, header, (void *) func);
187}
188
189void show_wchan(int pid, int tid, const char *name) {
190    ON_DRY_RUN_RETURN();
191    char path[255];
192    char buffer[255];
193    int fd;
194    char name_buffer[255];
195
196    memset(buffer, 0, sizeof(buffer));
197
198    sprintf(path, "/proc/%d/wchan", tid);
199    if ((fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_CLOEXEC))) < 0) {
200        printf("Failed to open '%s' (%s)\n", path, strerror(errno));
201        return;
202    }
203
204    if (read(fd, buffer, sizeof(buffer)) < 0) {
205        printf("Failed to read '%s' (%s)\n", path, strerror(errno));
206        goto out_close;
207    }
208
209    snprintf(name_buffer, sizeof(name_buffer), "%*s%s",
210             pid == tid ? 0 : 3, "", name);
211
212    printf("%-7d %-32s %s\n", tid, name_buffer, buffer);
213
214out_close:
215    close(fd);
216    return;
217}
218
219void do_dmesg() {
220    printf("------ KERNEL LOG (dmesg) ------\n");
221    ON_DRY_RUN_RETURN();
222    /* Get size of kernel buffer */
223    int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0);
224    if (size <= 0) {
225        printf("Unexpected klogctl return value: %d\n\n", size);
226        return;
227    }
228    char *buf = (char *) malloc(size + 1);
229    if (buf == NULL) {
230        printf("memory allocation failed\n\n");
231        return;
232    }
233    int retval = klogctl(KLOG_READ_ALL, buf, size);
234    if (retval < 0) {
235        printf("klogctl failure\n\n");
236        free(buf);
237        return;
238    }
239    buf[retval] = '\0';
240    printf("%s\n\n", buf);
241    free(buf);
242    return;
243}
244
245void do_showmap(int pid, const char *name) {
246    char title[255];
247    char arg[255];
248
249    sprintf(title, "SHOW MAP %d (%s)", pid, name);
250    sprintf(arg, "%d", pid);
251    run_command(title, 10, SU_PATH, "root", "showmap", arg, NULL);
252}
253
254static int _dump_file_from_fd(const char *title, const char *path, int fd) {
255    if (title) {
256        printf("------ %s (%s", title, path);
257
258        struct stat st;
259        // Only show the modification time of non-device files.
260        size_t path_len = strlen(path);
261        if ((path_len < 6 || memcmp(path, "/proc/", 6)) &&
262                (path_len < 5 || memcmp(path, "/sys/", 5)) &&
263                (path_len < 3 || memcmp(path, "/d/", 3)) &&
264                !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    ON_DRY_RUN({ update_progress(WEIGHT_FILE); close(fd); return 0; });
273
274    bool newline = false;
275    fd_set read_set;
276    struct timeval tm;
277    while (1) {
278        FD_ZERO(&read_set);
279        FD_SET(fd, &read_set);
280        /* Timeout if no data is read for 30 seconds. */
281        tm.tv_sec = 30;
282        tm.tv_usec = 0;
283        uint64_t elapsed = nanotime();
284        int ret = TEMP_FAILURE_RETRY(select(fd + 1, &read_set, NULL, NULL, &tm));
285        if (ret == -1) {
286            printf("*** %s: select failed: %s\n", path, strerror(errno));
287            newline = true;
288            break;
289        } else if (ret == 0) {
290            elapsed = nanotime() - elapsed;
291            printf("*** %s: Timed out after %.3fs\n", path,
292                   (float) elapsed / NANOS_PER_SEC);
293            newline = true;
294            break;
295        } else {
296            char buffer[65536];
297            ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, sizeof(buffer)));
298            if (bytes_read > 0) {
299                fwrite(buffer, bytes_read, 1, stdout);
300                newline = (buffer[bytes_read-1] == '\n');
301            } else {
302                if (bytes_read == -1) {
303                    printf("*** %s: Failed to read from fd: %s", path, strerror(errno));
304                    newline = true;
305                }
306                break;
307            }
308        }
309    }
310    update_progress(WEIGHT_FILE);
311    close(fd);
312
313    if (!newline) printf("\n");
314    if (title) printf("\n");
315    return 0;
316}
317
318/* prints the contents of a file */
319int dump_file(const char *title, const char *path) {
320    int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC));
321    if (fd < 0) {
322        int err = errno;
323        printf("*** %s: %s\n", path, strerror(err));
324        if (title) printf("\n");
325        return -1;
326    }
327    return _dump_file_from_fd(title, path, fd);
328}
329
330/* calls skip to gate calling dump_from_fd recursively
331 * in the specified directory. dump_from_fd defaults to
332 * dump_file_from_fd above when set to NULL. skip defaults
333 * to false when set to NULL. dump_from_fd will always be
334 * called with title NULL.
335 */
336int dump_files(const char *title, const char *dir,
337        bool (*skip)(const char *path),
338        int (*dump_from_fd)(const char *title, const char *path, int fd)) {
339    DIR *dirp;
340    struct dirent *d;
341    char *newpath = NULL;
342    const char *slash = "/";
343    int fd, retval = 0;
344
345    if (title) {
346        printf("------ %s (%s) ------\n", title, dir);
347    }
348    ON_DRY_RUN_RETURN(0);
349
350    if (dir[strlen(dir) - 1] == '/') {
351        ++slash;
352    }
353    dirp = opendir(dir);
354    if (dirp == NULL) {
355        retval = -errno;
356        fprintf(stderr, "%s: %s\n", dir, strerror(errno));
357        return retval;
358    }
359
360    if (!dump_from_fd) {
361        dump_from_fd = dump_file_from_fd;
362    }
363    for (; ((d = readdir(dirp))); free(newpath), newpath = NULL) {
364        if ((d->d_name[0] == '.')
365         && (((d->d_name[1] == '.') && (d->d_name[2] == '\0'))
366          || (d->d_name[1] == '\0'))) {
367            continue;
368        }
369        asprintf(&newpath, "%s%s%s%s", dir, slash, d->d_name,
370                 (d->d_type == DT_DIR) ? "/" : "");
371        if (!newpath) {
372            retval = -errno;
373            continue;
374        }
375        if (skip && (*skip)(newpath)) {
376            continue;
377        }
378        if (d->d_type == DT_DIR) {
379            int ret = dump_files(NULL, newpath, skip, dump_from_fd);
380            if (ret < 0) {
381                retval = ret;
382            }
383            continue;
384        }
385        fd = TEMP_FAILURE_RETRY(open(newpath, O_RDONLY | O_NONBLOCK | O_CLOEXEC));
386        if (fd < 0) {
387            retval = fd;
388            printf("*** %s: %s\n", newpath, strerror(errno));
389            continue;
390        }
391        (*dump_from_fd)(NULL, newpath, fd);
392    }
393    closedir(dirp);
394    if (title) {
395        printf("\n");
396    }
397    return retval;
398}
399
400/* fd must have been opened with the flag O_NONBLOCK. With this flag set,
401 * it's possible to avoid issues where opening the file itself can get
402 * stuck.
403 */
404int dump_file_from_fd(const char *title, const char *path, int fd) {
405    int flags = fcntl(fd, F_GETFL);
406    if (flags == -1) {
407        printf("*** %s: failed to get flags on fd %d: %s\n", path, fd, strerror(errno));
408        close(fd);
409        return -1;
410    } else if (!(flags & O_NONBLOCK)) {
411        printf("*** %s: fd must have O_NONBLOCK set.\n", path);
412        close(fd);
413        return -1;
414    }
415    return _dump_file_from_fd(title, path, fd);
416}
417
418bool waitpid_with_timeout(pid_t pid, int timeout_seconds, int* status) {
419    sigset_t child_mask, old_mask;
420    sigemptyset(&child_mask);
421    sigaddset(&child_mask, SIGCHLD);
422
423    if (sigprocmask(SIG_BLOCK, &child_mask, &old_mask) == -1) {
424        printf("*** sigprocmask failed: %s\n", strerror(errno));
425        return false;
426    }
427
428    struct timespec ts;
429    ts.tv_sec = timeout_seconds;
430    ts.tv_nsec = 0;
431    int ret = TEMP_FAILURE_RETRY(sigtimedwait(&child_mask, NULL, &ts));
432    int saved_errno = errno;
433    // Set the signals back the way they were.
434    if (sigprocmask(SIG_SETMASK, &old_mask, NULL) == -1) {
435        printf("*** sigprocmask failed: %s\n", strerror(errno));
436        if (ret == 0) {
437            return false;
438        }
439    }
440    if (ret == -1) {
441        errno = saved_errno;
442        if (errno == EAGAIN) {
443            errno = ETIMEDOUT;
444        } else {
445            printf("*** sigtimedwait failed: %s\n", strerror(errno));
446        }
447        return false;
448    }
449
450    pid_t child_pid = waitpid(pid, status, WNOHANG);
451    if (child_pid != pid) {
452        if (child_pid != -1) {
453            printf("*** Waiting for pid %d, got pid %d instead\n", pid, child_pid);
454        } else {
455            printf("*** waitpid failed: %s\n", strerror(errno));
456        }
457        return false;
458    }
459    return true;
460}
461
462int run_command(const char *title, int timeout_seconds, const char *command, ...) {
463    fflush(stdout);
464
465    const char *args[1024] = {command};
466    size_t arg;
467    va_list ap;
468    va_start(ap, command);
469    if (title) printf("------ %s (%s", title, command);
470    for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) {
471        args[arg] = va_arg(ap, const char *);
472        if (args[arg] == NULL) break;
473        if (title) printf(" %s", args[arg]);
474    }
475    if (title) printf(") ------\n");
476    fflush(stdout);
477
478    ON_DRY_RUN({ update_progress(timeout_seconds); va_end(ap); return 0; });
479
480    int status = run_command_always(title, timeout_seconds, args);
481    va_end(ap);
482    return status;
483}
484
485/* forks a command and waits for it to finish */
486int run_command_always(const char *title, int timeout_seconds, const char *args[]) {
487    /* TODO: for now we're simplifying the progress calculation by using the timeout as the weight.
488     * It's a good approximation for most cases, except when calling dumpsys, where its weight
489     * should be much higher proportionally to its timeout. */
490    int weight = timeout_seconds;
491
492    const char *command = args[0];
493    uint64_t start = nanotime();
494    pid_t pid = fork();
495
496    /* handle error case */
497    if (pid < 0) {
498        printf("*** fork: %s\n", strerror(errno));
499        return pid;
500    }
501
502    /* handle child case */
503    if (pid == 0) {
504
505        /* make sure the child dies when dumpstate dies */
506        prctl(PR_SET_PDEATHSIG, SIGKILL);
507
508        /* just ignore SIGPIPE, will go down with parent's */
509        struct sigaction sigact;
510        memset(&sigact, 0, sizeof(sigact));
511        sigact.sa_handler = SIG_IGN;
512        sigaction(SIGPIPE, &sigact, NULL);
513
514        execvp(command, (char**) args);
515        printf("*** exec(%s): %s\n", command, strerror(errno));
516        fflush(stdout);
517        _exit(-1);
518    }
519
520    /* handle parent case */
521    int status;
522    bool ret = waitpid_with_timeout(pid, timeout_seconds, &status);
523    uint64_t elapsed = nanotime() - start;
524    if (!ret) {
525        if (errno == ETIMEDOUT) {
526            printf("*** %s: Timed out after %.3fs (killing pid %d)\n", command,
527                   (float) elapsed / NANOS_PER_SEC, pid);
528        } else {
529            printf("*** %s: Error after %.4fs (killing pid %d)\n", command,
530                   (float) elapsed / NANOS_PER_SEC, pid);
531        }
532        kill(pid, SIGTERM);
533        if (!waitpid_with_timeout(pid, 5, NULL)) {
534            kill(pid, SIGKILL);
535            if (!waitpid_with_timeout(pid, 5, NULL)) {
536                printf("*** %s: Cannot kill %d even with SIGKILL.\n", command, pid);
537            }
538        }
539        return -1;
540    }
541
542    if (WIFSIGNALED(status)) {
543        printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status));
544    } else if (WIFEXITED(status) && WEXITSTATUS(status) > 0) {
545        printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status));
546    }
547    if (title) printf("[%s: %.3fs elapsed]\n\n", command, (float)elapsed / NANOS_PER_SEC);
548
549    if (weight > 0) {
550        update_progress(weight);
551    }
552    return status;
553}
554
555void send_broadcast(const std::string& action, const std::vector<std::string>& args) {
556    if (args.size() > 1000) {
557        fprintf(stderr, "send_broadcast: too many arguments (%d)\n", (int) args.size());
558        return;
559    }
560    const char *am_args[1024] = { "/system/bin/am", "broadcast", "--user", "0",
561                                  "-a", action.c_str() };
562    size_t am_index = 5; // Starts at the index of last initial value above.
563    for (const std::string& arg : args) {
564        am_args[++am_index] = arg.c_str();
565    }
566    // Always terminate with NULL.
567    am_args[am_index + 1] = NULL;
568    run_command_always(NULL, 5, am_args);
569}
570
571size_t num_props = 0;
572static char* props[2000];
573
574static void print_prop(const char *key, const char *name, void *user) {
575    (void) user;
576    if (num_props < sizeof(props) / sizeof(props[0])) {
577        char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10];
578        snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name);
579        props[num_props++] = strdup(buf);
580    }
581}
582
583static int compare_prop(const void *a, const void *b) {
584    return strcmp(*(char * const *) a, *(char * const *) b);
585}
586
587/* prints all the system properties */
588void print_properties() {
589    printf("------ SYSTEM PROPERTIES ------\n");
590    ON_DRY_RUN_RETURN();
591    size_t i;
592    num_props = 0;
593    property_list(print_prop, NULL);
594    qsort(&props, num_props, sizeof(props[0]), compare_prop);
595
596    for (i = 0; i < num_props; ++i) {
597        fputs(props[i], stdout);
598        free(props[i]);
599    }
600    printf("\n");
601}
602
603/* redirect output to a service control socket */
604void redirect_to_socket(FILE *redirect, const char *service) {
605    int s = android_get_control_socket(service);
606    if (s < 0) {
607        fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno));
608        exit(1);
609    }
610    fcntl(s, F_SETFD, FD_CLOEXEC);
611    if (listen(s, 4) < 0) {
612        fprintf(stderr, "listen(control socket): %s\n", strerror(errno));
613        exit(1);
614    }
615
616    struct sockaddr addr;
617    socklen_t alen = sizeof(addr);
618    int fd = accept(s, &addr, &alen);
619    if (fd < 0) {
620        fprintf(stderr, "accept(control socket): %s\n", strerror(errno));
621        exit(1);
622    }
623
624    fflush(redirect);
625    dup2(fd, fileno(redirect));
626    close(fd);
627}
628
629/* redirect output to a file */
630void redirect_to_file(FILE *redirect, char *path) {
631    char *chp = path;
632
633    /* skip initial slash */
634    if (chp[0] == '/')
635        chp++;
636
637    /* create leading directories, if necessary */
638    while (chp && chp[0]) {
639        chp = strchr(chp, '/');
640        if (chp) {
641            *chp = 0;
642            mkdir(path, 0770);  /* drwxrwx--- */
643            *chp++ = '/';
644        }
645    }
646
647    int fd = TEMP_FAILURE_RETRY(open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
648                                     S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH));
649    if (fd < 0) {
650        fprintf(stderr, "%s: %s\n", path, strerror(errno));
651        exit(1);
652    }
653
654    TEMP_FAILURE_RETRY(dup2(fd, fileno(redirect)));
655    close(fd);
656}
657
658static bool should_dump_native_traces(const char* path) {
659    for (const char** p = native_processes_to_dump; *p; p++) {
660        if (!strcmp(*p, path)) {
661            return true;
662        }
663    }
664    return false;
665}
666
667/* dump Dalvik and native stack traces, return the trace file location (NULL if none) */
668const char *dump_traces() {
669    ON_DRY_RUN_RETURN(NULL);
670    const char* result = NULL;
671
672    char traces_path[PROPERTY_VALUE_MAX] = "";
673    property_get("dalvik.vm.stack-trace-file", traces_path, "");
674    if (!traces_path[0]) return NULL;
675
676    /* move the old traces.txt (if any) out of the way temporarily */
677    char anr_traces_path[PATH_MAX];
678    strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path));
679    strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path));
680    if (rename(traces_path, anr_traces_path) && errno != ENOENT) {
681        fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno));
682        return NULL;  // Can't rename old traces.txt -- no permission? -- leave it alone instead
683    }
684
685    /* create a new, empty traces.txt file to receive stack dumps */
686    int fd = TEMP_FAILURE_RETRY(open(traces_path, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW | O_CLOEXEC,
687                                     0666));  /* -rw-rw-rw- */
688    if (fd < 0) {
689        fprintf(stderr, "%s: %s\n", traces_path, strerror(errno));
690        return NULL;
691    }
692    int chmod_ret = fchmod(fd, 0666);
693    if (chmod_ret < 0) {
694        fprintf(stderr, "fchmod on %s failed: %s\n", traces_path, strerror(errno));
695        close(fd);
696        return NULL;
697    }
698
699    /* Variables below must be initialized before 'goto' statements */
700    int dalvik_found = 0;
701    int ifd, wfd = -1;
702
703    /* walk /proc and kill -QUIT all Dalvik processes */
704    DIR *proc = opendir("/proc");
705    if (proc == NULL) {
706        fprintf(stderr, "/proc: %s\n", strerror(errno));
707        goto error_close_fd;
708    }
709
710    /* use inotify to find when processes are done dumping */
711    ifd = inotify_init();
712    if (ifd < 0) {
713        fprintf(stderr, "inotify_init: %s\n", strerror(errno));
714        goto error_close_fd;
715    }
716
717    wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE);
718    if (wfd < 0) {
719        fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno));
720        goto error_close_ifd;
721    }
722
723    struct dirent *d;
724    while ((d = readdir(proc))) {
725        int pid = atoi(d->d_name);
726        if (pid <= 0) continue;
727
728        char path[PATH_MAX];
729        char data[PATH_MAX];
730        snprintf(path, sizeof(path), "/proc/%d/exe", pid);
731        ssize_t len = readlink(path, data, sizeof(data) - 1);
732        if (len <= 0) {
733            continue;
734        }
735        data[len] = '\0';
736
737        if (!strncmp(data, "/system/bin/app_process", strlen("/system/bin/app_process"))) {
738            /* skip zygote -- it won't dump its stack anyway */
739            snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
740            int cfd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_CLOEXEC));
741            len = read(cfd, data, sizeof(data) - 1);
742            close(cfd);
743            if (len <= 0) {
744                continue;
745            }
746            data[len] = '\0';
747            if (!strncmp(data, "zygote", strlen("zygote"))) {
748                continue;
749            }
750
751            ++dalvik_found;
752            uint64_t start = nanotime();
753            if (kill(pid, SIGQUIT)) {
754                fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno));
755                continue;
756            }
757
758            /* wait for the writable-close notification from inotify */
759            struct pollfd pfd = { ifd, POLLIN, 0 };
760            int ret = poll(&pfd, 1, 5000);  /* 5 sec timeout */
761            if (ret < 0) {
762                fprintf(stderr, "poll: %s\n", strerror(errno));
763            } else if (ret == 0) {
764                fprintf(stderr, "warning: timed out dumping pid %d\n", pid);
765            } else {
766                struct inotify_event ie;
767                read(ifd, &ie, sizeof(ie));
768            }
769
770            if (lseek(fd, 0, SEEK_END) < 0) {
771                fprintf(stderr, "lseek: %s\n", strerror(errno));
772            } else {
773                dprintf(fd, "[dump dalvik stack %d: %.3fs elapsed]\n",
774                        pid, (float)(nanotime() - start) / NANOS_PER_SEC);
775            }
776        } else if (should_dump_native_traces(data)) {
777            /* dump native process if appropriate */
778            if (lseek(fd, 0, SEEK_END) < 0) {
779                fprintf(stderr, "lseek: %s\n", strerror(errno));
780            } else {
781                static uint16_t timeout_failures = 0;
782                uint64_t start = nanotime();
783
784                /* If 3 backtrace dumps fail in a row, consider debuggerd dead. */
785                if (timeout_failures == 3) {
786                    dprintf(fd, "too many stack dump failures, skipping...\n");
787                } else if (dump_backtrace_to_file_timeout(pid, fd, 20) == -1) {
788                    dprintf(fd, "dumping failed, likely due to a timeout\n");
789                    timeout_failures++;
790                } else {
791                    timeout_failures = 0;
792                }
793                dprintf(fd, "[dump native stack %d: %.3fs elapsed]\n",
794                        pid, (float)(nanotime() - start) / NANOS_PER_SEC);
795            }
796        }
797    }
798
799    if (dalvik_found == 0) {
800        fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n");
801    }
802
803    static char dump_traces_path[PATH_MAX];
804    strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path));
805    strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path));
806    if (rename(traces_path, dump_traces_path)) {
807        fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno));
808        goto error_close_ifd;
809    }
810    result = dump_traces_path;
811
812    /* replace the saved [ANR] traces.txt file */
813    rename(anr_traces_path, traces_path);
814
815error_close_ifd:
816    close(ifd);
817error_close_fd:
818    close(fd);
819    return result;
820}
821
822void dump_route_tables() {
823    ON_DRY_RUN_RETURN();
824    const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
825    dump_file("RT_TABLES", RT_TABLES_PATH);
826    FILE* fp = fopen(RT_TABLES_PATH, "re");
827    if (!fp) {
828        printf("*** %s: %s\n", RT_TABLES_PATH, strerror(errno));
829        return;
830    }
831    char table[16];
832    // Each line has an integer (the table number), a space, and a string (the table name). We only
833    // need the table number. It's a 32-bit unsigned number, so max 10 chars. Skip the table name.
834    // Add a fixed max limit so this doesn't go awry.
835    for (int i = 0; i < 64 && fscanf(fp, " %10s %*s", table) == 1; ++i) {
836        run_command("ROUTE TABLE IPv4", 10, "ip", "-4", "route", "show", "table", table, NULL);
837        run_command("ROUTE TABLE IPv6", 10, "ip", "-6", "route", "show", "table", table, NULL);
838    }
839    fclose(fp);
840}
841
842/* overall progress */
843int progress = 0;
844int do_update_progress = 0; // Set by dumpstate.cpp
845int weight_total = WEIGHT_TOTAL;
846
847// TODO: make this function thread safe if sections are generated in parallel.
848void update_progress(int delta) {
849    if (!do_update_progress) return;
850
851    progress += delta;
852
853    char key[PROPERTY_KEY_MAX];
854    char value[PROPERTY_VALUE_MAX];
855
856    // adjusts max on the fly
857    if (progress > weight_total) {
858        int new_total = weight_total * 1.2;
859        fprintf(stderr, "Adjusting total weight from %d to %d\n", weight_total, new_total);
860        weight_total = new_total;
861        sprintf(key, "dumpstate.%d.max", getpid());
862        sprintf(value, "%d", weight_total);
863        int status = property_set(key, value);
864        if (status) {
865            ALOGW("Could not update max weight by setting system property %s to %s: %d\n",
866                    key, value, status);
867        }
868    }
869
870    sprintf(key, "dumpstate.%d.progress", getpid());
871    sprintf(value, "%d", progress);
872
873    // stderr is ignored on normal invocations, but useful when calling /system/bin/dumpstate
874    // directly for debuggging.
875    fprintf(stderr, "Setting progress (%s): %s/%d\n", key, value, weight_total);
876
877    int status = property_set(key, value);
878    if (status) {
879        ALOGW("Could not update progress by setting system property %s to %s: %d\n",
880                key, value, status);
881    }
882}
883
884void take_screenshot(const std::string& path) {
885    const char *args[] = { "/system/bin/screencap", "-p", path.c_str(), NULL };
886    run_command_always(NULL, 10, args);
887}
888
889void dump_emmc_ecsd(const char *ext_csd_path) {
890    static const size_t EXT_CSD_REV = 192;
891    static const size_t EXT_PRE_EOL_INFO = 267;
892    static const size_t EXT_DEVICE_LIFE_TIME_EST_TYP_A = 268;
893    static const size_t EXT_DEVICE_LIFE_TIME_EST_TYP_B = 269;
894    struct hex {
895        char str[2];
896    } buffer[512];
897    int fd, ext_csd_rev, ext_pre_eol_info;
898    ssize_t bytes_read;
899    static const char *ver_str[] = {
900        "4.0", "4.1", "4.2", "4.3", "Obsolete", "4.41", "4.5", "5.0"
901    };
902    static const char *eol_str[] = {
903        "Undefined",
904        "Normal",
905        "Warning (consumed 80% of reserve)",
906        "Urgent (consumed 90% of reserve)"
907    };
908
909    printf("------ %s Extended CSD ------\n", ext_csd_path);
910
911    fd = TEMP_FAILURE_RETRY(open(ext_csd_path,
912                                 O_RDONLY | O_NONBLOCK | O_CLOEXEC));
913    if (fd < 0) {
914        printf("*** %s: %s\n\n", ext_csd_path, strerror(errno));
915        return;
916    }
917
918    bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, sizeof(buffer)));
919    close(fd);
920    if (bytes_read < 0) {
921        printf("*** %s: %s\n\n", ext_csd_path, strerror(errno));
922        return;
923    }
924    if (bytes_read < (ssize_t)(EXT_CSD_REV * sizeof(struct hex))) {
925        printf("*** %s: truncated content %zd\n\n", ext_csd_path, bytes_read);
926        return;
927    }
928
929    ext_csd_rev = 0;
930    if (sscanf(buffer[EXT_CSD_REV].str, "%02x", &ext_csd_rev) != 1) {
931        printf("*** %s: EXT_CSD_REV parse error \"%.2s\"\n\n",
932               ext_csd_path, buffer[EXT_CSD_REV].str);
933        return;
934    }
935
936    printf("rev 1.%d (MMC %s)\n",
937           ext_csd_rev,
938           (ext_csd_rev < (int)(sizeof(ver_str) / sizeof(ver_str[0]))) ?
939               ver_str[ext_csd_rev] :
940               "Unknown");
941    if (ext_csd_rev < 7) {
942        printf("\n");
943        return;
944    }
945
946    if (bytes_read < (ssize_t)(EXT_PRE_EOL_INFO * sizeof(struct hex))) {
947        printf("*** %s: truncated content %zd\n\n", ext_csd_path, bytes_read);
948        return;
949    }
950
951    ext_pre_eol_info = 0;
952    if (sscanf(buffer[EXT_PRE_EOL_INFO].str, "%02x", &ext_pre_eol_info) != 1) {
953        printf("*** %s: PRE_EOL_INFO parse error \"%.2s\"\n\n",
954               ext_csd_path, buffer[EXT_PRE_EOL_INFO].str);
955        return;
956    }
957    printf("PRE_EOL_INFO %d (MMC %s)\n",
958           ext_pre_eol_info,
959           eol_str[(ext_pre_eol_info < (int)
960                       (sizeof(eol_str) / sizeof(eol_str[0]))) ?
961                           ext_pre_eol_info : 0]);
962
963    for (size_t lifetime = EXT_DEVICE_LIFE_TIME_EST_TYP_A;
964            lifetime <= EXT_DEVICE_LIFE_TIME_EST_TYP_B;
965            ++lifetime) {
966        int ext_device_life_time_est;
967        static const char *est_str[] = {
968            "Undefined",
969            "0-10% of device lifetime used",
970            "10-20% of device lifetime used",
971            "20-30% of device lifetime used",
972            "30-40% of device lifetime used",
973            "40-50% of device lifetime used",
974            "50-60% of device lifetime used",
975            "60-70% of device lifetime used",
976            "70-80% of device lifetime used",
977            "80-90% of device lifetime used",
978            "90-100% of device lifetime used",
979            "Exceeded the maximum estimated device lifetime",
980        };
981
982        if (bytes_read < (ssize_t)(lifetime * sizeof(struct hex))) {
983            printf("*** %s: truncated content %zd\n", ext_csd_path, bytes_read);
984            break;
985        }
986
987        ext_device_life_time_est = 0;
988        if (sscanf(buffer[lifetime].str, "%02x", &ext_device_life_time_est) != 1) {
989            printf("*** %s: DEVICE_LIFE_TIME_EST_TYP_%c parse error \"%.2s\"\n",
990                   ext_csd_path,
991                   (unsigned)(lifetime - EXT_DEVICE_LIFE_TIME_EST_TYP_A) + 'A',
992                   buffer[lifetime].str);
993            continue;
994        }
995        printf("DEVICE_LIFE_TIME_EST_TYP_%c %d (MMC %s)\n",
996               (unsigned)(lifetime - EXT_DEVICE_LIFE_TIME_EST_TYP_A) + 'A',
997               ext_device_life_time_est,
998               est_str[(ext_device_life_time_est < (int)
999                           (sizeof(est_str) / sizeof(est_str[0]))) ?
1000                               ext_device_life_time_est : 0]);
1001    }
1002
1003    printf("\n");
1004}
1005