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/*
* Copyright (C) 2012 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 <stdbool.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <cutils/debugger.h>
#include <cutils/sockets.h>
#if defined(__LP64__)
#include <elf.h>
static bool is32bit(pid_t tid) {
char* exeline;
if (asprintf(&exeline, "/proc/%d/exe", tid) == -1) {
return false;
}
int fd = open(exeline, O_RDONLY | O_CLOEXEC);
free(exeline);
if (fd == -1) {
return false;
}
char ehdr[EI_NIDENT];
ssize_t bytes = read(fd, &ehdr, sizeof(ehdr));
close(fd);
if (bytes != (ssize_t) sizeof(ehdr) || memcmp(ELFMAG, ehdr, SELFMAG) != 0) {
return false;
}
if (ehdr[EI_CLASS] == ELFCLASS32) {
return true;
}
return false;
}
#endif
static int send_request(int sock_fd, void* msg_ptr, size_t msg_len) {
int result = 0;
if (TEMP_FAILURE_RETRY(write(sock_fd, msg_ptr, msg_len)) != (ssize_t) msg_len) {
result = -1;
} else {
char ack;
if (TEMP_FAILURE_RETRY(read(sock_fd, &ack, 1)) != 1) {
result = -1;
}
}
return result;
}
static int make_dump_request(debugger_action_t action, pid_t tid) {
const char* socket_name;
debugger_msg_t msg;
size_t msg_len;
void* msg_ptr;
#if defined(__LP64__)
debugger32_msg_t msg32;
if (is32bit(tid)) {
msg_len = sizeof(debugger32_msg_t);
memset(&msg32, 0, msg_len);
msg32.tid = tid;
msg32.action = action;
msg_ptr = &msg32;
socket_name = DEBUGGER32_SOCKET_NAME;
} else
#endif
{
msg_len = sizeof(debugger_msg_t);
memset(&msg, 0, msg_len);
msg.tid = tid;
msg.action = action;
msg_ptr = &msg;
socket_name = DEBUGGER_SOCKET_NAME;
}
int sock_fd = socket_local_client(socket_name, ANDROID_SOCKET_NAMESPACE_ABSTRACT,
SOCK_STREAM | SOCK_CLOEXEC);
if (sock_fd < 0) {
return -1;
}
if (send_request(sock_fd, msg_ptr, msg_len) < 0) {
TEMP_FAILURE_RETRY(close(sock_fd));
return -1;
}
return sock_fd;
}
int dump_backtrace_to_file(pid_t tid, int fd) {
int sock_fd = make_dump_request(DEBUGGER_ACTION_DUMP_BACKTRACE, tid);
if (sock_fd < 0) {
return -1;
}
/* Write the data read from the socket to the fd. */
int result = 0;
char buffer[1024];
ssize_t n;
while ((n = TEMP_FAILURE_RETRY(read(sock_fd, buffer, sizeof(buffer)))) > 0) {
if (TEMP_FAILURE_RETRY(write(fd, buffer, n)) != n) {
result = -1;
break;
}
}
TEMP_FAILURE_RETRY(close(sock_fd));
return result;
}
int dump_tombstone(pid_t tid, char* pathbuf, size_t pathlen) {
int sock_fd = make_dump_request(DEBUGGER_ACTION_DUMP_TOMBSTONE, tid);
if (sock_fd < 0) {
return -1;
}
/* Read the tombstone file name. */
char buffer[100]; /* This is larger than the largest tombstone path. */
int result = 0;
ssize_t n = TEMP_FAILURE_RETRY(read(sock_fd, buffer, sizeof(buffer) - 1));
if (n <= 0) {
result = -1;
} else {
if (pathbuf && pathlen) {
if (n >= (ssize_t) pathlen) {
n = pathlen - 1;
}
buffer[n] = '\0';
memcpy(pathbuf, buffer, n + 1);
}
}
TEMP_FAILURE_RETRY(close(sock_fd));
return result;
}
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