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/*
* Copyright (C) 2019 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 <err.h>
#include <errno.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string>
#include <android-base/file.h>
#include <android-base/strings.h>
#include <ziparchive/zip_archive.h>
#include "Alloc.h"
#include "File.h"
std::string ZipGetContents(const char* filename) {
ZipArchiveHandle archive;
if (OpenArchive(filename, &archive) != 0) {
return "";
}
// It is assumed that the archive contains only a single entry.
void* cookie;
std::string contents;
if (StartIteration(archive, &cookie) == 0) {
ZipEntry entry;
std::string name;
if (Next(cookie, &entry, &name) == 0) {
contents.resize(entry.uncompressed_length);
if (ExtractToMemory(archive, &entry, reinterpret_cast<uint8_t*>(contents.data()),
entry.uncompressed_length) != 0) {
contents = "";
}
}
}
CloseArchive(archive);
return contents;
}
static void WaitPid(pid_t pid) {
int wstatus;
pid_t wait_pid = TEMP_FAILURE_RETRY(waitpid(pid, &wstatus, 0));
if (wait_pid != pid) {
if (wait_pid == -1) {
err(1, "waitpid() failed");
} else {
errx(1, "Unexpected pid from waitpid(): expected %d, returned %d", pid, wait_pid);
}
}
if (!WIFEXITED(wstatus)) {
errx(1, "Forked process did not terminate with exit() call");
}
if (WEXITSTATUS(wstatus) != 0) {
errx(1, "Bad exit value from forked process: returned %d", WEXITSTATUS(wstatus));
}
}
// This function should not do any memory allocations in the main function.
// Any true allocation should happen in fork'd code.
void GetUnwindInfo(const char* filename, AllocEntry** entries, size_t* num_entries) {
void* mem =
mmap(nullptr, sizeof(size_t), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
if (mem == MAP_FAILED) {
err(1, "Unable to allocate a shared map of size %zu", sizeof(size_t));
}
*reinterpret_cast<size_t*>(mem) = 0;
pid_t pid;
if ((pid = fork()) == 0) {
// First get the number of lines in the trace file. It is assumed
// that there are no blank lines, and every line contains a valid
// allocation operation.
std::string contents;
if (android::base::EndsWith(filename, ".zip")) {
contents = ZipGetContents(filename);
} else if (!android::base::ReadFileToString(filename, &contents)) {
errx(1, "Unable to get contents of %s", filename);
}
if (contents.empty()) {
errx(1, "Unable to get contents of %s", filename);
}
size_t lines = 0;
size_t index = 0;
while (true) {
index = contents.find('\n', index);
if (index == std::string::npos) {
break;
}
index++;
lines++;
}
if (contents[contents.size() - 1] != '\n') {
// Add one since the last line doesn't end in '\n'.
lines++;
}
*reinterpret_cast<size_t*>(mem) = lines;
_exit(0);
} else if (pid == -1) {
err(1, "fork() call failed");
}
WaitPid(pid);
*num_entries = *reinterpret_cast<size_t*>(mem);
munmap(mem, sizeof(size_t));
mem = mmap(nullptr, *num_entries * sizeof(AllocEntry), PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_SHARED, -1, 0);
if (mem == MAP_FAILED) {
err(1, "Unable to allocate a shared map of size %zu", *num_entries * sizeof(AllocEntry));
}
*entries = reinterpret_cast<AllocEntry*>(mem);
if ((pid = fork()) == 0) {
std::string contents;
if (android::base::EndsWith(filename, ".zip")) {
contents = ZipGetContents(filename);
} else if (!android::base::ReadFileToString(filename, &contents)) {
errx(1, "Unable to get contents of %s", filename);
}
if (contents.empty()) {
errx(1, "Contents of zip file %s is empty.", filename);
}
size_t entry_idx = 0;
size_t start_str = 0;
size_t end_str = 0;
while (true) {
end_str = contents.find('\n', start_str);
if (end_str == std::string::npos) {
break;
}
if (entry_idx == *num_entries) {
errx(1, "Too many entries, stopped at entry %zu", entry_idx);
}
contents[end_str] = '\0';
AllocGetData(&contents[start_str], &(*entries)[entry_idx++]);
start_str = end_str + 1;
}
if (entry_idx != *num_entries) {
errx(1, "Mismatched number of entries found: expected %zu, found %zu", *num_entries,
entry_idx);
}
_exit(0);
} else if (pid == -1) {
err(1, "fork() call failed");
}
WaitPid(pid);
}
void FreeEntries(AllocEntry* entries, size_t num_entries) {
munmap(entries, num_entries * sizeof(AllocEntry));
}
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