auto import from //depot/cupcake/@135843
diff --git a/debuggerd/debuggerd.c b/debuggerd/debuggerd.c
new file mode 100644
index 0000000..9394e1c
--- /dev/null
+++ b/debuggerd/debuggerd.c
@@ -0,0 +1,852 @@
+/* system/debuggerd/debuggerd.c
+**
+** Copyright 2006, 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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <dirent.h>
+
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <sys/exec_elf.h>
+#include <sys/stat.h>
+
+#include <cutils/sockets.h>
+#include <cutils/logd.h>
+#include <cutils/sockets.h>
+#include <cutils/properties.h>
+
+#include <linux/input.h>
+
+#include <private/android_filesystem_config.h>
+
+#include "utility.h"
+
+/* Main entry point to get the backtrace from the crashing process */
+extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
+ unsigned int sp_list[],
+ int *frame0_pc_sane,
+ bool at_fault);
+
+static char **process_name_ptr;
+
+static int logsocket = -1;
+
+#define ANDROID_LOG_INFO 4
+
+/* Log information onto the tombstone */
+void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...)
+{
+ char buf[128];
+
+ va_list ap;
+ va_start(ap, fmt);
+
+ if (tfd >= 0) {
+ int len;
+ vsnprintf(buf, sizeof(buf), fmt, ap);
+ len = strlen(buf);
+ if(tfd >= 0) write(tfd, buf, len);
+ }
+
+ if (!in_tombstone_only)
+ __android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap);
+}
+
+#define LOG(fmt...) _LOG(-1, 0, fmt)
+#if 0
+#define XLOG(fmt...) _LOG(-1, 0, fmt)
+#else
+#define XLOG(fmt...) do {} while(0)
+#endif
+
+// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so
+// 012345678901234567890123456789012345678901234567890123456789
+// 0 1 2 3 4 5
+
+mapinfo *parse_maps_line(char *line)
+{
+ mapinfo *mi;
+ int len = strlen(line);
+
+ if(len < 1) return 0;
+ line[--len] = 0;
+
+ if(len < 50) return 0;
+ if(line[20] != 'x') return 0;
+
+ mi = malloc(sizeof(mapinfo) + (len - 47));
+ if(mi == 0) return 0;
+
+ mi->start = strtoul(line, 0, 16);
+ mi->end = strtoul(line + 9, 0, 16);
+ /* To be filled in parse_exidx_info if the mapped section starts with
+ * elf_header
+ */
+ mi->exidx_start = mi->exidx_end = 0;
+ mi->next = 0;
+ strcpy(mi->name, line + 49);
+
+ return mi;
+}
+
+void dump_build_info(int tfd)
+{
+ char fingerprint[PROPERTY_VALUE_MAX];
+
+ property_get("ro.build.fingerprint", fingerprint, "unknown");
+
+ _LOG(tfd, false, "Build fingerprint: '%s'\n", fingerprint);
+}
+
+
+void dump_stack_and_code(int tfd, int pid, mapinfo *map,
+ int unwind_depth, unsigned int sp_list[],
+ int frame0_pc_sane, bool at_fault)
+{
+ unsigned int sp, pc, p, end, data;
+ struct pt_regs r;
+ int sp_depth;
+ bool only_in_tombstone = !at_fault;
+
+ if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return;
+ sp = r.ARM_sp;
+ pc = r.ARM_pc;
+
+ /* Died because calling the weeds - dump
+ * the code around the PC in the next frame instead.
+ */
+ if (frame0_pc_sane == 0) {
+ pc = r.ARM_lr;
+ }
+
+ _LOG(tfd, true, "code%s:\n", frame0_pc_sane ? "" : " (around frame #01)");
+
+ end = p = pc & ~3;
+ p -= 16;
+
+ /* Dump the code as:
+ * PC contents
+ * 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
+ * 00008d44 f7ff18a0 490ced94 68035860 d0012b00
+ */
+ while (p <= end) {
+ int i;
+
+ _LOG(tfd, true, " %08x ", p);
+ for (i = 0; i < 4; i++) {
+ data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
+ _LOG(tfd, true, " %08x", data);
+ p += 4;
+ }
+ _LOG(tfd, true, "\n", p);
+ }
+
+ p = sp - 64;
+ p &= ~3;
+ if (unwind_depth != 0) {
+ if (unwind_depth < STACK_CONTENT_DEPTH) {
+ end = sp_list[unwind_depth-1];
+ }
+ else {
+ end = sp_list[STACK_CONTENT_DEPTH-1];
+ }
+ }
+ else {
+ end = sp | 0x000000ff;
+ end += 0xff;
+ }
+
+ _LOG(tfd, only_in_tombstone, "stack:\n");
+
+ /* If the crash is due to PC == 0, there will be two frames that
+ * have identical SP value.
+ */
+ if (sp_list[0] == sp_list[1]) {
+ sp_depth = 1;
+ }
+ else {
+ sp_depth = 0;
+ }
+
+ while (p <= end) {
+ char *prompt;
+ char level[16];
+ data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
+ if (p == sp_list[sp_depth]) {
+ sprintf(level, "#%02d", sp_depth++);
+ prompt = level;
+ }
+ else {
+ prompt = " ";
+ }
+
+ /* Print the stack content in the log for the first 3 frames. For the
+ * rest only print them in the tombstone file.
+ */
+ _LOG(tfd, (sp_depth > 2) || only_in_tombstone,
+ "%s %08x %08x %s\n", prompt, p, data,
+ map_to_name(map, data, ""));
+ p += 4;
+ }
+ /* print another 64-byte of stack data after the last frame */
+
+ end = p+64;
+ while (p <= end) {
+ data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
+ _LOG(tfd, (sp_depth > 2) || only_in_tombstone,
+ " %08x %08x %s\n", p, data,
+ map_to_name(map, data, ""));
+ p += 4;
+ }
+}
+
+void dump_pc_and_lr(int tfd, int pid, mapinfo *map, int unwound_level,
+ bool at_fault)
+{
+ struct pt_regs r;
+
+ if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
+ _LOG(tfd, !at_fault, "tid %d not responding!\n", pid);
+ return;
+ }
+
+ if (unwound_level == 0) {
+ _LOG(tfd, !at_fault, " #%02d pc %08x %s\n", 0, r.ARM_pc,
+ map_to_name(map, r.ARM_pc, "<unknown>"));
+ }
+ _LOG(tfd, !at_fault, " #%02d lr %08x %s\n", 1, r.ARM_lr,
+ map_to_name(map, r.ARM_lr, "<unknown>"));
+}
+
+void dump_registers(int tfd, int pid, bool at_fault)
+{
+ struct pt_regs r;
+ bool only_in_tombstone = !at_fault;
+
+ if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
+ _LOG(tfd, only_in_tombstone,
+ "cannot get registers: %s\n", strerror(errno));
+ return;
+ }
+
+ _LOG(tfd, only_in_tombstone, " r0 %08x r1 %08x r2 %08x r3 %08x\n",
+ r.ARM_r0, r.ARM_r1, r.ARM_r2, r.ARM_r3);
+ _LOG(tfd, only_in_tombstone, " r4 %08x r5 %08x r6 %08x r7 %08x\n",
+ r.ARM_r4, r.ARM_r5, r.ARM_r6, r.ARM_r7);
+ _LOG(tfd, only_in_tombstone, " r8 %08x r9 %08x 10 %08x fp %08x\n",
+ r.ARM_r8, r.ARM_r9, r.ARM_r10, r.ARM_fp);
+ _LOG(tfd, only_in_tombstone,
+ " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n",
+ r.ARM_ip, r.ARM_sp, r.ARM_lr, r.ARM_pc, r.ARM_cpsr);
+}
+
+const char *get_signame(int sig)
+{
+ switch(sig) {
+ case SIGILL: return "SIGILL";
+ case SIGABRT: return "SIGABRT";
+ case SIGBUS: return "SIGBUS";
+ case SIGFPE: return "SIGFPE";
+ case SIGSEGV: return "SIGSEGV";
+ case SIGSTKFLT: return "SIGSTKFLT";
+ default: return "?";
+ }
+}
+
+void dump_fault_addr(int tfd, int pid, int sig)
+{
+ siginfo_t si;
+
+ memset(&si, 0, sizeof(si));
+ if(ptrace(PTRACE_GETSIGINFO, pid, 0, &si)){
+ _LOG(tfd, false, "cannot get siginfo: %s\n", strerror(errno));
+ } else {
+ _LOG(tfd, false, "signal %d (%s), fault addr %08x\n",
+ sig, get_signame(sig), si.si_addr);
+ }
+}
+
+void dump_crash_banner(int tfd, unsigned pid, unsigned tid, int sig)
+{
+ char data[1024];
+ char *x = 0;
+ FILE *fp;
+
+ sprintf(data, "/proc/%d/cmdline", pid);
+ fp = fopen(data, "r");
+ if(fp) {
+ x = fgets(data, 1024, fp);
+ fclose(fp);
+ }
+
+ _LOG(tfd, false,
+ "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
+ dump_build_info(tfd);
+ _LOG(tfd, false, "pid: %d, tid: %d >>> %s <<<\n",
+ pid, tid, x ? x : "UNKNOWN");
+
+ if(sig) dump_fault_addr(tfd, tid, sig);
+}
+
+static void parse_exidx_info(mapinfo *milist, pid_t pid)
+{
+ mapinfo *mi;
+ for (mi = milist; mi != NULL; mi = mi->next) {
+ Elf32_Ehdr ehdr;
+
+ memset(&ehdr, 0, sizeof(Elf32_Ehdr));
+ /* Read in sizeof(Elf32_Ehdr) worth of data from the beginning of
+ * mapped section.
+ */
+ get_remote_struct(pid, (void *) (mi->start), &ehdr,
+ sizeof(Elf32_Ehdr));
+ /* Check if it has the matching magic words */
+ if (IS_ELF(ehdr)) {
+ Elf32_Phdr phdr;
+ Elf32_Phdr *ptr;
+ int i;
+
+ ptr = (Elf32_Phdr *) (mi->start + ehdr.e_phoff);
+ for (i = 0; i < ehdr.e_phnum; i++) {
+ /* Parse the program header */
+ get_remote_struct(pid, (void *) ptr+i, &phdr,
+ sizeof(Elf32_Phdr));
+ /* Found a EXIDX segment? */
+ if (phdr.p_type == PT_ARM_EXIDX) {
+ mi->exidx_start = mi->start + phdr.p_offset;
+ mi->exidx_end = mi->exidx_start + phdr.p_filesz;
+ break;
+ }
+ }
+ }
+ }
+}
+
+void dump_crash_report(int tfd, unsigned pid, unsigned tid, bool at_fault)
+{
+ char data[1024];
+ FILE *fp;
+ mapinfo *milist = 0;
+ unsigned int sp_list[STACK_CONTENT_DEPTH];
+ int stack_depth;
+ int frame0_pc_sane = 1;
+
+ if (!at_fault) {
+ _LOG(tfd, true,
+ "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n");
+ _LOG(tfd, true, "pid: %d, tid: %d\n", pid, tid);
+ }
+
+ dump_registers(tfd, tid, at_fault);
+
+ /* Clear stack pointer records */
+ memset(sp_list, 0, sizeof(sp_list));
+
+ sprintf(data, "/proc/%d/maps", pid);
+ fp = fopen(data, "r");
+ if(fp) {
+ while(fgets(data, 1024, fp)) {
+ mapinfo *mi = parse_maps_line(data);
+ if(mi) {
+ mi->next = milist;
+ milist = mi;
+ }
+ }
+ fclose(fp);
+ }
+
+ parse_exidx_info(milist, tid);
+
+ /* If stack unwinder fails, use the default solution to dump the stack
+ * content.
+ */
+ stack_depth = unwind_backtrace_with_ptrace(tfd, tid, milist, sp_list,
+ &frame0_pc_sane, at_fault);
+
+ /* The stack unwinder should at least unwind two levels of stack. If less
+ * level is seen we make sure at lease pc and lr are dumped.
+ */
+ if (stack_depth < 2) {
+ dump_pc_and_lr(tfd, tid, milist, stack_depth, at_fault);
+ }
+
+ dump_stack_and_code(tfd, tid, milist, stack_depth, sp_list, frame0_pc_sane,
+ at_fault);
+
+ while(milist) {
+ mapinfo *next = milist->next;
+ free(milist);
+ milist = next;
+ }
+}
+
+/* FIXME: unused: use it or lose it*/
+#if 0
+static
+void start_gdbserver_vs(int pid, int port)
+{
+ pid_t p;
+ char *args[5];
+ char commspec[16];
+ char pidspec[16];
+
+ p = fork();
+ if(p < 0) {
+ LOG("could not fork()\n");
+ return;
+ }
+
+ if(p == 0) {
+ sprintf(commspec, ":%d", port);
+ sprintf(pidspec, "%d", pid);
+ args[0] = "/system/bin/gdbserver";
+ args[1] = commspec;
+ args[2] = "--attach";
+ args[3] = pidspec;
+ args[4] = 0;
+ exit(execv(args[0], args));
+ } else {
+ LOG("gdbserver pid=%d port=%d targetpid=%d\n",
+ p, port, pid);
+
+ sleep(5);
+ }
+}
+#endif
+
+#define MAX_TOMBSTONES 10
+
+#define typecheck(x,y) { \
+ typeof(x) __dummy1; \
+ typeof(y) __dummy2; \
+ (void)(&__dummy1 == &__dummy2); }
+
+#define TOMBSTONE_DIR "/data/tombstones"
+
+/*
+ * find_and_open_tombstone - find an available tombstone slot, if any, of the
+ * form tombstone_XX where XX is 00 to MAX_TOMBSTONES-1, inclusive. If no
+ * file is available, we reuse the least-recently-modified file.
+ */
+static int find_and_open_tombstone(void)
+{
+ unsigned long mtime = ULONG_MAX;
+ struct stat sb;
+ char path[128];
+ int fd, i, oldest = 0;
+
+ /*
+ * XXX: Our stat.st_mtime isn't time_t. If it changes, as it probably ought
+ * to, our logic breaks. This check will generate a warning if that happens.
+ */
+ typecheck(mtime, sb.st_mtime);
+
+ /*
+ * In a single wolf-like pass, find an available slot and, in case none
+ * exist, find and record the least-recently-modified file.
+ */
+ for (i = 0; i < MAX_TOMBSTONES; i++) {
+ snprintf(path, sizeof(path), TOMBSTONE_DIR"/tombstone_%02d", i);
+
+ if (!stat(path, &sb)) {
+ if (sb.st_mtime < mtime) {
+ oldest = i;
+ mtime = sb.st_mtime;
+ }
+ continue;
+ }
+ if (errno != ENOENT)
+ continue;
+
+ fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0600);
+ if (fd < 0)
+ continue; /* raced ? */
+
+ fchown(fd, AID_SYSTEM, AID_SYSTEM);
+ return fd;
+ }
+
+ /* we didn't find an available file, so we clobber the oldest one */
+ snprintf(path, sizeof(path), TOMBSTONE_DIR"/tombstone_%02d", oldest);
+ fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
+ fchown(fd, AID_SYSTEM, AID_SYSTEM);
+
+ return fd;
+}
+
+/* Return true if some thread is not detached cleanly */
+static bool dump_sibling_thread_report(int tfd, unsigned pid, unsigned tid)
+{
+ char task_path[1024];
+
+ sprintf(task_path, "/proc/%d/task", pid);
+ DIR *d;
+ struct dirent *de;
+ int need_cleanup = 0;
+
+ d = opendir(task_path);
+ /* Bail early if cannot open the task directory */
+ if (d == NULL) {
+ XLOG("Cannot open /proc/%d/task\n", pid);
+ return false;
+ }
+ while ((de = readdir(d)) != NULL) {
+ unsigned new_tid;
+ /* Ignore "." and ".." */
+ if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
+ continue;
+ new_tid = atoi(de->d_name);
+ /* The main thread at fault has been handled individually */
+ if (new_tid == tid)
+ continue;
+
+ /* Skip this thread if cannot ptrace it */
+ if (ptrace(PTRACE_ATTACH, new_tid, 0, 0) < 0)
+ continue;
+
+ dump_crash_report(tfd, pid, new_tid, false);
+ need_cleanup |= ptrace(PTRACE_DETACH, new_tid, 0, 0);
+ }
+ closedir(d);
+ return need_cleanup != 0;
+}
+
+/* Return true if some thread is not detached cleanly */
+static bool engrave_tombstone(unsigned pid, unsigned tid, int debug_uid,
+ int signal)
+{
+ int fd;
+ bool need_cleanup = false;
+
+ mkdir(TOMBSTONE_DIR, 0755);
+ chown(TOMBSTONE_DIR, AID_SYSTEM, AID_SYSTEM);
+
+ fd = find_and_open_tombstone();
+ if (fd < 0)
+ return need_cleanup;
+
+ dump_crash_banner(fd, pid, tid, signal);
+ dump_crash_report(fd, pid, tid, true);
+ /*
+ * If the user has requested to attach gdb, don't collect the per-thread
+ * information as it increases the chance to lose track of the process.
+ */
+ if ((signed)pid > debug_uid) {
+ need_cleanup = dump_sibling_thread_report(fd, pid, tid);
+ }
+
+ close(fd);
+ return need_cleanup;
+}
+
+static int
+write_string(const char* file, const char* string)
+{
+ int len;
+ int fd;
+ ssize_t amt;
+ fd = open(file, O_RDWR);
+ len = strlen(string);
+ if (fd < 0)
+ return -errno;
+ amt = write(fd, string, len);
+ close(fd);
+ return amt >= 0 ? 0 : -errno;
+}
+
+static
+void init_debug_led(void)
+{
+ // trout leds
+ write_string("/sys/class/leds/red/brightness", "0");
+ write_string("/sys/class/leds/green/brightness", "0");
+ write_string("/sys/class/leds/blue/brightness", "0");
+ write_string("/sys/class/leds/red/device/blink", "0");
+ // sardine leds
+ write_string("/sys/class/leds/left/cadence", "0,0");
+}
+
+static
+void enable_debug_led(void)
+{
+ // trout leds
+ write_string("/sys/class/leds/red/brightness", "255");
+ // sardine leds
+ write_string("/sys/class/leds/left/cadence", "1,0");
+}
+
+static
+void disable_debug_led(void)
+{
+ // trout leds
+ write_string("/sys/class/leds/red/brightness", "0");
+ // sardine leds
+ write_string("/sys/class/leds/left/cadence", "0,0");
+}
+
+extern int init_getevent();
+extern void uninit_getevent();
+extern int get_event(struct input_event* event, int timeout);
+
+static void wait_for_user_action(unsigned tid, struct ucred* cr)
+{
+ (void)tid;
+ /* First log a helpful message */
+ LOG( "********************************************************\n"
+ "* process %d crashed. debuggerd waiting for gdbserver \n"
+ "* \n"
+ "* adb shell gdbserver :port --attach %d & \n"
+ "* \n"
+ "* and press the HOME key. \n"
+ "********************************************************\n",
+ cr->pid, cr->pid);
+
+ /* wait for HOME key */
+ if (init_getevent() == 0) {
+ int ms = 1200 / 10;
+ int dit = 1;
+ int dah = 3*dit;
+ int _ = -dit;
+ int ___ = 3*_;
+ int _______ = 7*_;
+ const signed char codes[] = {
+ dit,_,dit,_,dit,___,dah,_,dah,_,dah,___,dit,_,dit,_,dit,_______
+ };
+ size_t s = 0;
+ struct input_event e;
+ int home = 0;
+ init_debug_led();
+ enable_debug_led();
+ do {
+ int timeout = abs((int)(codes[s])) * ms;
+ int res = get_event(&e, timeout);
+ if (res == 0) {
+ if (e.type==EV_KEY && e.code==KEY_HOME && e.value==0)
+ home = 1;
+ } else if (res == 1) {
+ if (++s >= sizeof(codes)/sizeof(*codes))
+ s = 0;
+ if (codes[s] > 0) {
+ enable_debug_led();
+ } else {
+ disable_debug_led();
+ }
+ }
+ } while (!home);
+ uninit_getevent();
+ }
+
+ /* don't forget to turn debug led off */
+ disable_debug_led();
+
+ /* close filedescriptor */
+ LOG("debuggerd resuming process %d", cr->pid);
+ }
+
+static void handle_crashing_process(int fd)
+{
+ char buf[64];
+ struct stat s;
+ unsigned tid;
+ struct ucred cr;
+ int n, len, status;
+ int tid_attach_status = -1;
+ unsigned retry = 30;
+ bool need_cleanup = false;
+
+ char value[PROPERTY_VALUE_MAX];
+ property_get("debug.db.uid", value, "-1");
+ int debug_uid = atoi(value);
+
+ XLOG("handle_crashing_process(%d)\n", fd);
+
+ len = sizeof(cr);
+ n = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &len);
+ if(n != 0) {
+ LOG("cannot get credentials\n");
+ goto done;
+ }
+
+ XLOG("reading tid\n");
+ fcntl(fd, F_SETFL, O_NONBLOCK);
+ while((n = read(fd, &tid, sizeof(unsigned))) != sizeof(unsigned)) {
+ if(errno == EINTR) continue;
+ if(errno == EWOULDBLOCK) {
+ if(retry-- > 0) {
+ usleep(100 * 1000);
+ continue;
+ }
+ LOG("timed out reading tid\n");
+ goto done;
+ }
+ LOG("read failure? %s\n", strerror(errno));
+ goto done;
+ }
+
+ sprintf(buf,"/proc/%d/task/%d", cr.pid, tid);
+ if(stat(buf, &s)) {
+ LOG("tid %d does not exist in pid %d. ignorning debug request\n",
+ tid, cr.pid);
+ close(fd);
+ return;
+ }
+
+ XLOG("BOOM: pid=%d uid=%d gid=%d tid=%d\n", cr.pid, cr.uid, cr.gid, tid);
+
+ tid_attach_status = ptrace(PTRACE_ATTACH, tid, 0, 0);
+ if(tid_attach_status < 0) {
+ LOG("ptrace attach failed: %s\n", strerror(errno));
+ goto done;
+ }
+
+ close(fd);
+ fd = -1;
+
+ for(;;) {
+ n = waitpid(tid, &status, __WALL);
+
+ if(n < 0) {
+ if(errno == EAGAIN) continue;
+ LOG("waitpid failed: %s\n", strerror(errno));
+ goto done;
+ }
+
+ XLOG("waitpid: n=%d status=%08x\n", n, status);
+
+ if(WIFSTOPPED(status)){
+ n = WSTOPSIG(status);
+ switch(n) {
+ case SIGSTOP:
+ XLOG("stopped -- continuing\n");
+ n = ptrace(PTRACE_CONT, tid, 0, 0);
+ if(n) {
+ LOG("ptrace failed: %s\n", strerror(errno));
+ goto done;
+ }
+ continue;
+
+ case SIGILL:
+ case SIGABRT:
+ case SIGBUS:
+ case SIGFPE:
+ case SIGSEGV:
+ case SIGSTKFLT: {
+ XLOG("stopped -- fatal signal\n");
+ need_cleanup = engrave_tombstone(cr.pid, tid, debug_uid, n);
+ kill(tid, SIGSTOP);
+ goto done;
+ }
+
+ default:
+ XLOG("stopped -- unexpected signal\n");
+ goto done;
+ }
+ } else {
+ XLOG("unexpected waitpid response\n");
+ goto done;
+ }
+ }
+
+done:
+ XLOG("detaching\n");
+
+ /* stop the process so we can debug */
+ kill(cr.pid, SIGSTOP);
+
+ /*
+ * If a thread has been attached by ptrace, make sure it is detached
+ * successfully otherwise we will get a zombie.
+ */
+ if (tid_attach_status == 0) {
+ int detach_status;
+ /* detach so we can attach gdbserver */
+ detach_status = ptrace(PTRACE_DETACH, tid, 0, 0);
+ need_cleanup |= (detach_status != 0);
+ }
+
+ /*
+ * if debug.db.uid is set, its value indicates if we should wait
+ * for user action for the crashing process.
+ * in this case, we log a message and turn the debug LED on
+ * waiting for a gdb connection (for instance)
+ */
+
+ if ((signed)cr.uid <= debug_uid) {
+ wait_for_user_action(tid, &cr);
+ }
+
+ /* resume stopped process (so it can crash in peace) */
+ kill(cr.pid, SIGCONT);
+
+ if (need_cleanup) {
+ LOG("debuggerd committing suicide to free the zombie!\n");
+ kill(getpid(), SIGKILL);
+ }
+
+ if(fd != -1) close(fd);
+}
+
+int main(int argc, char **argv)
+{
+ int s;
+ struct sigaction act;
+
+ process_name_ptr = argv;
+
+ logsocket = socket_local_client("logd",
+ ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_DGRAM);
+ if(logsocket < 0) {
+ logsocket = -1;
+ } else {
+ fcntl(logsocket, F_SETFD, FD_CLOEXEC);
+ }
+
+ act.sa_handler = SIG_DFL;
+ sigemptyset(&act.sa_mask);
+ sigaddset(&act.sa_mask,SIGCHLD);
+ act.sa_flags = SA_NOCLDWAIT;
+ sigaction(SIGCHLD, &act, 0);
+
+ s = socket_local_server("android:debuggerd",
+ ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
+ if(s < 0) return -1;
+ fcntl(s, F_SETFD, FD_CLOEXEC);
+
+ LOG("debuggerd: " __DATE__ " " __TIME__ "\n");
+
+ for(;;) {
+ struct sockaddr addr;
+ socklen_t alen;
+ int fd;
+
+ alen = sizeof(addr);
+ fd = accept(s, &addr, &alen);
+ if(fd < 0) continue;
+
+ fcntl(fd, F_SETFD, FD_CLOEXEC);
+
+ handle_crashing_process(fd);
+ }
+ return 0;
+}