153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdbool.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <cutils/debugger.h>
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#include <cutils/sockets.h>
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#if defined(__LP64__)
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#include <elf.h>
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static bool is32bit(pid_t tid) {
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char* exeline;
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if (asprintf(&exeline, "/proc/%d/exe", tid) == -1) {
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return false;
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}
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int fd = open(exeline, O_RDONLY | O_CLOEXEC);
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free(exeline);
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if (fd == -1) {
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return false;
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}
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char ehdr[EI_NIDENT];
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ssize_t bytes = read(fd, &ehdr, sizeof(ehdr));
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close(fd);
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if (bytes != (ssize_t) sizeof(ehdr) || memcmp(ELFMAG, ehdr, SELFMAG) != 0) {
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return false;
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}
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if (ehdr[EI_CLASS] == ELFCLASS32) {
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return true;
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}
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return false;
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}
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#endif
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static int send_request(int sock_fd, void* msg_ptr, size_t msg_len) {
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int result = 0;
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if (TEMP_FAILURE_RETRY(write(sock_fd, msg_ptr, msg_len)) != (ssize_t) msg_len) {
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result = -1;
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} else {
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char ack;
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if (TEMP_FAILURE_RETRY(read(sock_fd, &ack, 1)) != 1) {
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result = -1;
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}
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}
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return result;
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}
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static int make_dump_request(debugger_action_t action, pid_t tid) {
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const char* socket_name;
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debugger_msg_t msg;
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size_t msg_len;
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void* msg_ptr;
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#if defined(__LP64__)
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debugger32_msg_t msg32;
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if (is32bit(tid)) {
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msg_len = sizeof(debugger32_msg_t);
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memset(&msg32, 0, msg_len);
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msg32.tid = tid;
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msg32.action = action;
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msg_ptr = &msg32;
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socket_name = DEBUGGER32_SOCKET_NAME;
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} else
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#endif
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{
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msg_len = sizeof(debugger_msg_t);
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memset(&msg, 0, msg_len);
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msg.tid = tid;
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msg.action = action;
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msg_ptr = &msg;
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socket_name = DEBUGGER_SOCKET_NAME;
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}
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int sock_fd = socket_local_client(socket_name, ANDROID_SOCKET_NAMESPACE_ABSTRACT,
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SOCK_STREAM | SOCK_CLOEXEC);
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if (sock_fd < 0) {
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return -1;
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}
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if (send_request(sock_fd, msg_ptr, msg_len) < 0) {
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TEMP_FAILURE_RETRY(close(sock_fd));
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return -1;
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}
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return sock_fd;
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}
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int dump_backtrace_to_file(pid_t tid, int fd) {
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int sock_fd = make_dump_request(DEBUGGER_ACTION_DUMP_BACKTRACE, tid);
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if (sock_fd < 0) {
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return -1;
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}
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/* Write the data read from the socket to the fd. */
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int result = 0;
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char buffer[1024];
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ssize_t n;
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while ((n = TEMP_FAILURE_RETRY(read(sock_fd, buffer, sizeof(buffer)))) > 0) {
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if (TEMP_FAILURE_RETRY(write(fd, buffer, n)) != n) {
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result = -1;
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break;
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}
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}
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TEMP_FAILURE_RETRY(close(sock_fd));
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return result;
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}
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int dump_tombstone(pid_t tid, char* pathbuf, size_t pathlen) {
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int sock_fd = make_dump_request(DEBUGGER_ACTION_DUMP_TOMBSTONE, tid);
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if (sock_fd < 0) {
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return -1;
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}
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/* Read the tombstone file name. */
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char buffer[100]; /* This is larger than the largest tombstone path. */
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int result = 0;
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ssize_t n = TEMP_FAILURE_RETRY(read(sock_fd, buffer, sizeof(buffer) - 1));
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if (n <= 0) {
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result = -1;
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} else {
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if (pathbuf && pathlen) {
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if (n >= (ssize_t) pathlen) {
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n = pathlen - 1;
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}
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buffer[n] = '\0';
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memcpy(pathbuf, buffer, n + 1);
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}
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}
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TEMP_FAILURE_RETRY(close(sock_fd));
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return result;
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}
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