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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <poll.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/inotify.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <cutils/properties.h>
#include <cutils/sockets.h>
#include <private/android_filesystem_config.h>
#include "dumpstate.h"
void for_each_pid(void (*func)(int, const char *), const char *header) {
DIR *d;
struct dirent *de;
if (!(d = opendir("/proc"))) {
printf("Failed to open /proc (%s)\n", strerror(errno));
return;
}
printf("\n------ %s ------\n", header);
while ((de = readdir(d))) {
int pid;
int fd;
char cmdpath[255];
char cmdline[255];
if (!(pid = atoi(de->d_name))) {
continue;
}
sprintf(cmdpath,"/proc/%d/cmdline", pid);
memset(cmdline, 0, sizeof(cmdline));
if ((fd = open(cmdpath, O_RDONLY)) < 0) {
strcpy(cmdline, "N/A");
} else {
read(fd, cmdline, sizeof(cmdline));
close(fd);
}
func(pid, cmdline);
}
closedir(d);
}
void show_wchan(int pid, const char *name) {
char path[255];
char buffer[255];
int fd;
memset(buffer, 0, sizeof(buffer));
sprintf(path, "/proc/%d/wchan", pid);
if ((fd = open(path, O_RDONLY)) < 0) {
printf("Failed to open '%s' (%s)\n", path, strerror(errno));
return;
}
if (read(fd, buffer, sizeof(buffer)) < 0) {
printf("Failed to read '%s' (%s)\n", path, strerror(errno));
goto out_close;
}
printf("%-7d %-32s %s\n", pid, name, buffer);
out_close:
close(fd);
return;
}
/* prints the contents of a file */
int dump_file(const char *title, const char* path) {
char buffer[32768];
int fd = open(path, O_RDONLY);
if (fd < 0) {
int err = errno;
if (title) printf("------ %s (%s) ------\n", title, path);
printf("*** %s: %s\n", path, strerror(err));
if (title) printf("\n");
return -1;
}
if (title) printf("------ %s (%s", title, path);
if (title) {
struct stat st;
if (memcmp(path, "/proc/", 6) && memcmp(path, "/sys/", 5) && !fstat(fd, &st)) {
char stamp[80];
time_t mtime = st.st_mtime;
strftime(stamp, sizeof(stamp), "%Y-%m-%d %H:%M:%S", localtime(&mtime));
printf(": %s", stamp);
}
printf(") ------\n");
}
int newline = 0;
for (;;) {
int ret = read(fd, buffer, sizeof(buffer));
if (ret > 0) {
newline = (buffer[ret - 1] == '\n');
ret = fwrite(buffer, ret, 1, stdout);
}
if (ret <= 0) break;
}
close(fd);
if (!newline) printf("\n");
if (title) printf("\n");
return 0;
}
/* forks a command and waits for it to finish */
int run_command(const char *title, int timeout_seconds, const char *command, ...) {
fflush(stdout);
clock_t start = clock();
pid_t pid = fork();
/* handle error case */
if (pid < 0) {
printf("*** fork: %s\n", strerror(errno));
return pid;
}
/* handle child case */
if (pid == 0) {
const char *args[1024] = {command};
size_t arg;
va_list ap;
va_start(ap, command);
if (title) printf("------ %s (%s", title, command);
for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) {
args[arg] = va_arg(ap, const char *);
if (args[arg] == NULL) break;
if (title) printf(" %s", args[arg]);
}
if (title) printf(") ------\n");
fflush(stdout);
execvp(command, (char**) args);
printf("*** exec(%s): %s\n", command, strerror(errno));
_exit(-1);
}
/* handle parent case */
for (;;) {
int status;
pid_t p = waitpid(pid, &status, WNOHANG);
float elapsed = (float) (clock() - start) / CLOCKS_PER_SEC;
if (p == pid) {
if (WIFSIGNALED(status)) {
printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status));
} else if (WEXITSTATUS(status) > 0) {
printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status));
}
if (title) printf("[%s: %.1fs elapsed]\n\n", command, elapsed);
return status;
}
if (timeout_seconds && elapsed > timeout_seconds) {
printf("*** %s: Timed out after %.1fs (killing pid %d)\n", command, elapsed, pid);
kill(pid, SIGTERM);
return -1;
}
usleep(100000); // poll every 0.1 sec
}
}
size_t num_props = 0;
static char* props[2000];
static void print_prop(const char *key, const char *name, void *user) {
(void) user;
if (num_props < sizeof(props) / sizeof(props[0])) {
char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10];
snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name);
props[num_props++] = strdup(buf);
}
}
static int compare_prop(const void *a, const void *b) {
return strcmp(*(char * const *) a, *(char * const *) b);
}
/* prints all the system properties */
void print_properties() {
size_t i;
num_props = 0;
property_list(print_prop, NULL);
qsort(&props, num_props, sizeof(props[0]), compare_prop);
printf("------ SYSTEM PROPERTIES ------\n");
for (i = 0; i < num_props; ++i) {
fputs(props[i], stdout);
free(props[i]);
}
printf("\n");
}
/* redirect output to a service control socket */
void redirect_to_socket(FILE *redirect, const char *service) {
int s = android_get_control_socket(service);
if (s < 0) {
fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno));
exit(1);
}
if (listen(s, 4) < 0) {
fprintf(stderr, "listen(control socket): %s\n", strerror(errno));
exit(1);
}
struct sockaddr addr;
socklen_t alen = sizeof(addr);
int fd = accept(s, &addr, &alen);
if (fd < 0) {
fprintf(stderr, "accept(control socket): %s\n", strerror(errno));
exit(1);
}
fflush(redirect);
dup2(fd, fileno(redirect));
close(fd);
}
/* redirect output to a file, optionally gzipping; returns gzip pid (or -1) */
pid_t redirect_to_file(FILE *redirect, char *path, int gzip_level) {
char *chp = path;
/* skip initial slash */
if (chp[0] == '/')
chp++;
/* create leading directories, if necessary */
while (chp && chp[0]) {
chp = strchr(chp, '/');
if (chp) {
*chp = 0;
mkdir(path, 0775); /* drwxrwxr-x */
*chp++ = '/';
}
}
int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd < 0) {
fprintf(stderr, "%s: %s\n", path, strerror(errno));
exit(1);
}
pid_t gzip_pid = -1;
if (gzip_level > 0) {
int fds[2];
if (pipe(fds)) {
fprintf(stderr, "pipe: %s\n", strerror(errno));
exit(1);
}
fflush(redirect);
fflush(stdout);
gzip_pid = fork();
if (gzip_pid < 0) {
fprintf(stderr, "fork: %s\n", strerror(errno));
exit(1);
}
if (gzip_pid == 0) {
dup2(fds[0], STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
close(fd);
close(fds[0]);
close(fds[1]);
char level[10];
snprintf(level, sizeof(level), "-%d", gzip_level);
execlp("gzip", "gzip", level, NULL);
fprintf(stderr, "exec(gzip): %s\n", strerror(errno));
_exit(-1);
}
close(fd);
close(fds[0]);
fd = fds[1];
}
dup2(fd, fileno(redirect));
close(fd);
return gzip_pid;
}
/* dump Dalvik stack traces, return the trace file location (NULL if none) */
const char *dump_vm_traces() {
char traces_path[PROPERTY_VALUE_MAX] = "";
property_get("dalvik.vm.stack-trace-file", traces_path, "");
if (!traces_path[0]) return NULL;
/* move the old traces.txt (if any) out of the way temporarily */
char anr_traces_path[PATH_MAX];
strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path));
strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path));
if (rename(traces_path, anr_traces_path) && errno != ENOENT) {
fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno));
return NULL; // Can't rename old traces.txt -- no permission? -- leave it alone instead
}
/* make the directory if necessary */
char anr_traces_dir[PATH_MAX];
strlcpy(anr_traces_dir, traces_path, sizeof(anr_traces_dir));
char *slash = strrchr(anr_traces_dir, '/');
if (slash != NULL) {
*slash = '\0';
if (!mkdir(anr_traces_dir, 0775)) {
chown(anr_traces_dir, AID_SYSTEM, AID_SYSTEM);
} else if (errno != EEXIST) {
fprintf(stderr, "mkdir(%s): %s\n", anr_traces_dir, strerror(errno));
return NULL;
}
}
/* create a new, empty traces.txt file to receive stack dumps */
int fd = open(traces_path, O_CREAT | O_WRONLY | O_TRUNC, 0666); /* -rw-rw-rw- */
if (fd < 0) {
fprintf(stderr, "%s: %s\n", traces_path, strerror(errno));
return NULL;
}
close(fd);
/* walk /proc and kill -QUIT all Dalvik processes */
DIR *proc = opendir("/proc");
if (proc == NULL) {
fprintf(stderr, "/proc: %s\n", strerror(errno));
return NULL;
}
/* use inotify to find when processes are done dumping */
int ifd = inotify_init();
if (ifd < 0) {
fprintf(stderr, "inotify_init: %s\n", strerror(errno));
return NULL;
}
int wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE);
if (wfd < 0) {
fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno));
return NULL;
}
struct dirent *d;
int dalvik_found = 0;
while ((d = readdir(proc))) {
int pid = atoi(d->d_name);
if (pid <= 0) continue;
/* identify Dalvik: /proc/(pid)/exe = /system/bin/app_process */
char path[PATH_MAX], data[PATH_MAX];
snprintf(path, sizeof(path), "/proc/%d/exe", pid);
size_t len = readlink(path, data, sizeof(data) - 1);
if (len <= 0 || memcmp(data, "/system/bin/app_process", 23)) continue;
/* skip zygote -- it won't dump its stack anyway */
snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
int fd = open(path, O_RDONLY);
len = read(fd, data, sizeof(data) - 1);
close(fd);
if (len <= 0 || !memcmp(data, "zygote", 6)) continue;
++dalvik_found;
if (kill(pid, SIGQUIT)) {
fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno));
continue;
}
/* wait for the writable-close notification from inotify */
struct pollfd pfd = { ifd, POLLIN, 0 };
int ret = poll(&pfd, 1, 200); /* 200 msec timeout */
if (ret < 0) {
fprintf(stderr, "poll: %s\n", strerror(errno));
} else if (ret == 0) {
fprintf(stderr, "warning: timed out dumping pid %d\n", pid);
} else {
struct inotify_event ie;
read(ifd, &ie, sizeof(ie));
}
}
close(ifd);
if (dalvik_found == 0) {
fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n");
}
static char dump_traces_path[PATH_MAX];
strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path));
strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path));
if (rename(traces_path, dump_traces_path)) {
fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno));
return NULL;
}
/* replace the saved [ANR] traces.txt file */
rename(anr_traces_path, traces_path);
return dump_traces_path;
}
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