mozilla
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gecko-dev
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gecko-dev/other-licenses/android/APKOpen.cpp

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23 KiB
C++
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Android code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Michael Wu <mwu@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* This custom library loading code is only meant to be called
* during initialization. As a result, it takes no special
* precautions to be threadsafe. Any of the library loading functions
* like mozload should not be available to other code.
*/
#include <jni.h>
#include <android/log.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/limits.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <endian.h>
#include <unistd.h>
#include <zlib.h>
#include <linux/ashmem.h>
#include "dlfcn.h"
#include "APKOpen.h"
#include <sys/time.h>
#include <sys/resource.h>
/* compression methods */
#define STORE 0
#define DEFLATE 8
#define LZMA 14
#define NS_EXPORT __attribute__ ((visibility("default")))
struct local_file_header {
uint32_t signature;
uint16_t min_version;
uint16_t general_flag;
uint16_t compression;
uint16_t lastmod_time;
uint16_t lastmod_date;
uint32_t crc32;
uint32_t compressed_size;
uint32_t uncompressed_size;
uint16_t filename_size;
uint16_t extra_field_size;
char data[0];
} __attribute__((__packed__));
struct cdir_entry {
uint32_t signature;
uint16_t creator_version;
uint16_t min_version;
uint16_t general_flag;
uint16_t compression;
uint16_t lastmod_time;
uint16_t lastmod_date;
uint32_t crc32;
uint32_t compressed_size;
uint32_t uncompressed_size;
uint16_t filename_size;
uint16_t extra_field_size;
uint16_t file_comment_size;
uint16_t disk_num;
uint16_t internal_attr;
uint32_t external_attr;
uint32_t offset;
char data[0];
} __attribute__((__packed__));
#define CDIR_END_SIG 0x06054b50
struct cdir_end {
uint32_t signature;
uint16_t disk_num;
uint16_t cdir_disk;
uint16_t disk_entries;
uint16_t cdir_entries;
uint32_t cdir_size;
uint32_t cdir_offset;
uint16_t comment_size;
char comment[0];
} __attribute__((__packed__));
static size_t zip_size;
static int zip_fd;
static struct mapping_info * lib_mapping = NULL;
NS_EXPORT const struct mapping_info *
getLibraryMapping()
{
return lib_mapping;
}
static int
createAshmem(size_t bytes, const char *name)
{
int fd = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
if (fd < 0)
return -1;
char buf[ASHMEM_NAME_LEN];
strlcpy(buf, name, sizeof(buf));
/*ret = */ioctl(fd, ASHMEM_SET_NAME, buf);
if (!ioctl(fd, ASHMEM_SET_SIZE, bytes))
return fd;
close(fd);
return -1;
}
static void * map_file (const char *file)
{
int fd = open(file, O_RDONLY);
if (fd == -1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoMapFile", "map_file open %s", strerror(errno));
return NULL;
}
zip_fd = fd;
struct stat s;
if (fstat(fd, &s) == -1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoMapFile", "map_file fstat %s", strerror(errno));
return NULL;
}
zip_size = s.st_size;
void *addr = mmap(NULL, zip_size, PROT_READ, MAP_SHARED, fd, 0);
if (addr == MAP_FAILED) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoMapFile", "map_file mmap %s", strerror(errno));
return NULL;
}
return addr;
}
static uint32_t cdir_entry_size (struct cdir_entry *entry)
{
return sizeof(*entry) +
letoh16(entry->filename_size) +
letoh16(entry->extra_field_size) +
letoh16(entry->file_comment_size);
}
static struct cdir_entry *
find_cdir_entry (struct cdir_entry *entry, int count, const char *name)
{
size_t name_size = strlen(name);
while (count--) {
if (letoh16(entry->filename_size) == name_size &&
!memcmp(entry->data, name, name_size))
return entry;
entry = (struct cdir_entry *)((void *)entry + cdir_entry_size(entry));
}
return NULL;
}
#define SHELL_WRAPPER0(name) \
typedef void (*name ## _t)(JNIEnv *, jclass); \
static name ## _t f_ ## name; \
extern "C" NS_EXPORT void JNICALL \
Java_org_mozilla_gecko_GeckoAppShell_ ## name(JNIEnv *jenv, jclass jc) \
{ \
f_ ## name(jenv, jc); \
}
#define SHELL_WRAPPER1(name,type1) \
typedef void (*name ## _t)(JNIEnv *, jclass, type1 one); \
static name ## _t f_ ## name; \
extern "C" NS_EXPORT void JNICALL \
Java_org_mozilla_gecko_GeckoAppShell_ ## name(JNIEnv *jenv, jclass jc, type1 one) \
{ \
f_ ## name(jenv, jc, one); \
}
#define SHELL_WRAPPER2(name,type1,type2) \
typedef void (*name ## _t)(JNIEnv *, jclass, type1 one, type2 two); \
static name ## _t f_ ## name; \
extern "C" NS_EXPORT void JNICALL \
Java_org_mozilla_gecko_GeckoAppShell_ ## name(JNIEnv *jenv, jclass jc, type1 one, type2 two) \
{ \
f_ ## name(jenv, jc, one, two); \
}
#define SHELL_WRAPPER3(name,type1,type2,type3) \
typedef void (*name ## _t)(JNIEnv *, jclass, type1 one, type2 two, type3 three); \
static name ## _t f_ ## name; \
extern "C" NS_EXPORT void JNICALL \
Java_org_mozilla_gecko_GeckoAppShell_ ## name(JNIEnv *jenv, jclass jc, type1 one, type2 two, type3 three) \
{ \
f_ ## name(jenv, jc, one, two, three); \
}
SHELL_WRAPPER0(nativeInit)
SHELL_WRAPPER1(nativeRun, jstring)
SHELL_WRAPPER1(notifyGeckoOfEvent, jobject)
SHELL_WRAPPER1(setSurfaceView, jobject)
SHELL_WRAPPER0(onResume)
SHELL_WRAPPER0(onLowMemory)
SHELL_WRAPPER3(callObserver, jstring, jstring, jstring)
SHELL_WRAPPER1(removeObserver, jstring)
SHELL_WRAPPER1(onChangeNetworkLinkStatus, jstring)
SHELL_WRAPPER1(reportJavaCrash, jstring)
static void * xul_handle = NULL;
static time_t apk_mtime = 0;
#ifdef DEBUG
extern "C" int extractLibs = 1;
#else
extern "C" int extractLibs = 0;
#endif
#ifdef DEBUG
#define DEBUG_EXTRACT_LIBS 1
#endif
#ifdef DEBUG_EXTRACT_LIBS
static uint32_t simple_write(int fd, const void *buf, uint32_t count)
{
uint32_t out_offset = 0;
while (out_offset < count) {
uint32_t written = write(fd, buf + out_offset,
count - out_offset);
if (written == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK)
continue;
else {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "simple_write failed");
break;
}
}
out_offset += written;
}
return out_offset;
}
static void
extractFile(const char * path, const struct cdir_entry *entry, void * data)
{
uint32_t size = letoh32(entry->uncompressed_size);
struct stat status;
if (!stat(path, &status) &&
status.st_size == size &&
apk_mtime < status.st_mtime)
return;
int fd = open(path, O_CREAT | O_NOATIME | O_TRUNC | O_RDWR, S_IRWXU);
if (fd == -1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't open %s to decompress library", path);
return;
}
void * buf = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (buf == (void *)-1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't mmap decompression buffer");
return;
}
z_stream strm = {
next_in: (Bytef *)data,
avail_in: letoh32(entry->compressed_size),
total_in: 0,
next_out: (Bytef *)buf,
avail_out: 4096,
total_out: 0
};
int ret;
ret = inflateInit2(&strm, -MAX_WBITS);
if (ret != Z_OK)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflateInit failed: %s", strm.msg);
while ((ret = inflate(&strm, Z_SYNC_FLUSH)) != Z_STREAM_END) {
simple_write(fd, buf, 4096 - strm.avail_out);
strm.next_out = (Bytef *)buf;
strm.avail_out = 4096;
}
simple_write(fd, buf, 4096 - strm.avail_out);
if (ret != Z_STREAM_END)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflate failed: %s", strm.msg);
if (strm.total_out != size)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "extracted %d, expected %d!", strm.total_out, size);
ret = inflateEnd(&strm);
if (ret != Z_OK)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflateEnd failed: %s", strm.msg);
close(fd);
munmap(buf, 4096);
}
#endif
static void
extractLib(const struct cdir_entry *entry, void * data, void * dest)
{
z_stream strm = {
next_in: (Bytef *)data,
avail_in: letoh32(entry->compressed_size),
total_in: 0,
next_out: (Bytef *)dest,
avail_out: letoh32(entry->uncompressed_size),
total_out: 0
};
int ret;
ret = inflateInit2(&strm, -MAX_WBITS);
if (ret != Z_OK)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflateInit failed: %s", strm.msg);
ret = inflate(&strm, Z_SYNC_FLUSH);
if (ret != Z_STREAM_END)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflate failed: %s", strm.msg);
ret = inflateEnd(&strm);
if (ret != Z_OK)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflateEnd failed: %s", strm.msg);
if (strm.total_out != letoh32(entry->uncompressed_size))
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "File not fully uncompressed! %d / %d", strm.total_out, letoh32(entry->uncompressed_size));
}
static int cache_count = 0;
static struct lib_cache_info *cache_mapping = NULL;
NS_EXPORT const struct lib_cache_info *
getLibraryCache()
{
return cache_mapping;
}
static void
ensureLibCache()
{
if (!cache_mapping)
cache_mapping = (struct lib_cache_info *)calloc(MAX_LIB_CACHE_ENTRIES,
sizeof(*cache_mapping));
}
static void
fillLibCache(const char *buf)
{
ensureLibCache();
char * str = strdup(buf);
if (!str)
return;
char * saveptr;
char * nextstr = str;
do {
struct lib_cache_info *info = &cache_mapping[cache_count];
char * name = strtok_r(nextstr, ":", &saveptr);
if (!name)
break;
nextstr = NULL;
char * fd_str = strtok_r(NULL, ";", &saveptr);
if (!fd_str)
break;
long int fd = strtol(fd_str, NULL, 10);
if (fd == LONG_MIN || fd == LONG_MAX)
break;
strncpy(info->name, name, MAX_LIB_CACHE_NAME_LEN - 1);
info->fd = fd;
} while (cache_count++ < MAX_LIB_CACHE_ENTRIES);
free(str);
}
static int
lookupLibCacheFd(const char *libName)
{
if (!cache_mapping)
return -1;
int count = cache_count;
while (count--) {
struct lib_cache_info *info = &cache_mapping[count];
if (!strcmp(libName, info->name))
return info->fd;
}
return -1;
}
static void
addLibCacheFd(const char *libName, int fd, uint32_t lib_size = 0, void* buffer = NULL)
{
ensureLibCache();
struct lib_cache_info *info = &cache_mapping[cache_count++];
strncpy(info->name, libName, MAX_LIB_CACHE_NAME_LEN - 1);
info->fd = fd;
info->lib_size = lib_size;
info->buffer = buffer;
}
static void * mozload(const char * path, void *zip,
struct cdir_entry *cdir_start, uint16_t cdir_entries)
{
#ifdef DEBUG
struct timeval t0, t1;
gettimeofday(&t0, 0);
#endif
struct cdir_entry *entry = find_cdir_entry(cdir_start, cdir_entries, path);
struct local_file_header *file = (struct local_file_header *)(zip + letoh32(entry->offset));
void * data = ((void *)&file->data) + letoh16(file->filename_size) + letoh16(file->extra_field_size);
void * handle;
#ifdef DEBUG_EXTRACT_LIBS
if (extractLibs) {
char fullpath[PATH_MAX];
snprintf(fullpath, PATH_MAX, "%s/%s", getenv("CACHE_PATH"), path + 4);
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "resolved %s to %s", path, fullpath);
extractFile(fullpath, entry, data);
handle = __wrap_dlopen(fullpath, RTLD_LAZY);
if (!handle)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't load %s because %s", fullpath, __wrap_dlerror());
#ifdef DEBUG
gettimeofday(&t1, 0);
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "%s: spent %d", path,
(((long long)t1.tv_sec * 1000000LL) +
(long long)t1.tv_usec) -
(((long long)t0.tv_sec * 1000000LL) +
(long long)t0.tv_usec));
#endif
return handle;
}
#endif
size_t offset = letoh32(entry->offset) + sizeof(*file) + letoh16(file->filename_size) + letoh16(file->extra_field_size);
bool skipLibCache = false;
int fd = zip_fd;
void * buf = NULL;
uint32_t lib_size = letoh32(entry->uncompressed_size);
int cache_fd = 0;
if (letoh16(file->compression) == DEFLATE) {
cache_fd = lookupLibCacheFd(path + 4);
fd = cache_fd;
if (fd < 0) {
char fullpath[PATH_MAX];
snprintf(fullpath, PATH_MAX, "%s/%s", getenv("CACHE_PATH"), path + 4);
fd = open(fullpath, O_RDWR);
struct stat status;
if (stat(fullpath, &status) ||
status.st_size != lib_size ||
apk_mtime > status.st_mtime) {
unlink(fullpath);
fd = -1;
} else {
cache_fd = fd;
addLibCacheFd(path + 4, fd);
}
}
if (fd < 0)
fd = createAshmem(lib_size, path);
#ifdef DEBUG
else
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Loading %s from cache", path + 4);
#endif
if (fd < 0) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't open " ASHMEM_NAME_DEF ", Error %d, %s, using a file", errno, strerror(errno));
char fullpath[PATH_MAX];
snprintf(fullpath, PATH_MAX, "%s/%s", getenv("CACHE_PATH"), path + 4);
fd = open(fullpath, O_RDWR | O_CREAT);
if (fd < 0) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't create a file either, giving up");
return NULL;
}
// we'd like to use fallocate here, but it doesn't exist currently?
if (lseek(fd, lib_size - 1, SEEK_SET) == (off_t) - 1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "seeking file failed");
return NULL;
}
if (write(fd, "", 1) != 1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "writting one byte to the file failed");
return NULL;
}
skipLibCache = true;
addLibCacheFd(path + 4, fd);
}
buf = mmap(NULL, lib_size,
PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if (buf == (void *)-1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't mmap decompression buffer");
close(fd);
return NULL;
}
offset = 0;
if (cache_fd < 0) {
extractLib(entry, data, buf);
if (!skipLibCache)
addLibCacheFd(path + 4, fd, lib_size, buf);
}
// preload libxul, to avoid slowly demand-paging it
if (!strcmp(path, "lib/libxul.so"))
madvise(buf, entry->uncompressed_size, MADV_WILLNEED);
data = buf;
}
#ifdef DEBUG
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Loading %s with len %d (0x%08x) and offset %d (0x%08x)", path, lib_size, lib_size, offset, offset);
#endif
handle = moz_mapped_dlopen(path, RTLD_LAZY, fd, data,
lib_size, offset);
if (!handle)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't load %s because %s", path, __wrap_dlerror());
// if we're extracting the libs to disk and cache_fd is not valid then
// keep this buffer around so it can be used to write to disk
if (buf && (!extractLibs || cache_fd >= 0))
munmap(buf, lib_size);
#ifdef DEBUG
gettimeofday(&t1, 0);
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "%s: spent %d", path, (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) -
(((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec));
#endif
return handle;
}
static void *
extractBuf(const char * path, void *zip,
struct cdir_entry *cdir_start, uint16_t cdir_entries)
{
struct cdir_entry *entry = find_cdir_entry(cdir_start, cdir_entries, path);
struct local_file_header *file = (struct local_file_header *)(zip + letoh32(entry->offset));
void * data = ((void *)&file->data) + letoh16(file->filename_size) + letoh16(file->extra_field_size);
void * buf = malloc(letoh32(entry->uncompressed_size));
if (buf == (void *)-1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't alloc decompression buffer for %s", path);
return NULL;
}
if (letoh16(file->compression) == DEFLATE)
extractLib(entry, data, buf);
else
memcpy(buf, data, letoh32(entry->uncompressed_size));
return buf;
}
static int mapping_count = 0;
static char *file_ids = NULL;
#define MAX_MAPPING_INFO 32
extern "C" void
report_mapping(char *name, void *base, uint32_t len, uint32_t offset)
{
if (!file_ids || mapping_count >= MAX_MAPPING_INFO)
return;
struct mapping_info *info = &lib_mapping[mapping_count++];
info->name = strdup(name);
info->base = (uintptr_t)base;
info->len = len;
info->offset = offset;
char * entry = strstr(file_ids, name);
if (entry)
info->file_id = strndup(entry + strlen(name) + 1, 32);
}
extern "C" void simple_linker_init(void);
static void
loadLibs(const char *apkName)
{
chdir(getenv("GRE_HOME"));
simple_linker_init();
struct stat status;
if (!stat(apkName, &status))
apk_mtime = status.st_mtime;
struct timeval t0, t1;
gettimeofday(&t0, 0);
struct rusage usage1;
getrusage(RUSAGE_SELF, &usage1);
void *zip = map_file(apkName);
struct cdir_end *dirend = (struct cdir_end *)(zip + zip_size - sizeof(*dirend));
while ((void *)dirend > zip &&
letoh32(dirend->signature) != CDIR_END_SIG)
dirend = (struct cdir_end *)((void *)dirend - 1);
if (letoh32(dirend->signature) != CDIR_END_SIG) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't find end of central directory record");
return;
}
uint32_t cdir_offset = letoh32(dirend->cdir_offset);
uint16_t cdir_entries = letoh16(dirend->cdir_entries);
struct cdir_entry *cdir_start = (struct cdir_entry *)(zip + cdir_offset);
lib_mapping = (struct mapping_info *)calloc(MAX_MAPPING_INFO, sizeof(*lib_mapping));
#ifdef MOZ_CRASHREPORTER
file_ids = (char *)extractBuf("lib.id", zip, cdir_start, cdir_entries);
#endif
#define MOZLOAD(name) mozload("lib/lib" name ".so", zip, cdir_start, cdir_entries)
MOZLOAD("mozalloc");
MOZLOAD("nspr4");
MOZLOAD("plc4");
MOZLOAD("plds4");
MOZLOAD("mozsqlite3");
MOZLOAD("nssutil3");
MOZLOAD("nss3");
MOZLOAD("ssl3");
MOZLOAD("smime3");
xul_handle = MOZLOAD("xul");
MOZLOAD("xpcom");
MOZLOAD("nssckbi");
MOZLOAD("freebl3");
MOZLOAD("softokn3");
#undef MOZLOAD
close(zip_fd);
#ifdef MOZ_CRASHREPORTER
free(file_ids);
file_ids = NULL;
#endif
if (!xul_handle)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't get a handle to libxul!");
#define GETFUNC(name) f_ ## name = (name ## _t) __wrap_dlsym(xul_handle, "Java_org_mozilla_gecko_GeckoAppShell_" #name)
GETFUNC(nativeInit);
GETFUNC(nativeRun);
GETFUNC(notifyGeckoOfEvent);
GETFUNC(setSurfaceView);
GETFUNC(onResume);
GETFUNC(onLowMemory);
GETFUNC(callObserver);
GETFUNC(removeObserver);
GETFUNC(onChangeNetworkLinkStatus);
GETFUNC(reportJavaCrash);
#undef GETFUNC
gettimeofday(&t1, 0);
struct rusage usage2;
getrusage(RUSAGE_SELF, &usage2);
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Loaded libs in %dms total, %d faults",
(t1.tv_sec - t0.tv_sec)*1000 + (t1.tv_usec - t0.tv_usec)/1000,
usage2.ru_majflt-usage1.ru_majflt);
}
extern "C" NS_EXPORT void JNICALL
Java_org_mozilla_gecko_GeckoAppShell_loadLibs(JNIEnv *jenv, jclass jGeckoAppShellClass, jstring jApkName, jboolean jShouldExtract)
{
if (jShouldExtract)
extractLibs = 1;
const char* str;
// XXX: java doesn't give us true UTF8, we should figure out something
// better to do here
str = jenv->GetStringUTFChars(jApkName, NULL);
if (str == NULL)
return;
loadLibs(str);
jenv->ReleaseStringUTFChars(jApkName, str);
bool haveLibsToWrite = false;
if (cache_mapping && extractLibs)
for (int i = 0; i < cache_count && !haveLibsToWrite; i++)
if (cache_mapping[i].buffer)
haveLibsToWrite = true;
int count = cache_count;
struct lib_cache_info *info;
if (haveLibsToWrite) {
if (fork()) {
// just unmap. fork will do the real work.
while (count--) {
info = &cache_mapping[count];
if (!info->buffer)
continue;
munmap(info->buffer, info->lib_size);
}
}
else {
sleep(10);
nice(10);
while (count--) {
info = &cache_mapping[count];
if (!info->buffer)
continue;
char fullpath[PATH_MAX];
snprintf(fullpath, PATH_MAX, "%s/%s", getenv("CACHE_PATH"), info->name);
char tmp_path[PATH_MAX];
sprintf(tmp_path, "%s.tmp", fullpath);
int file_fd = open(tmp_path, O_CREAT | O_WRONLY);
// using sendfile would be preferable, but it doesn't seem to work
// with shared memory on any of the devices we've tested
uint32_t sent = write(file_fd, info->buffer, info->lib_size);
munmap(info->buffer, info->lib_size);
info->buffer = 0;
close(file_fd);
if (sent == info->lib_size)
rename(tmp_path, fullpath);
else
unlink(tmp_path);
}
exit(0);
}
}
}
typedef int GeckoProcessType;
typedef int nsresult;
extern "C" NS_EXPORT int
ChildProcessInit(int argc, char* argv[])
{
int i;
for (i = 0; i < (argc - 1); i++) {
if (strcmp(argv[i], "-greomni"))
continue;
i = i + 1;
break;
}
fillLibCache(argv[argc - 1]);
loadLibs(argv[i]);
// don't pass the last arg - it's only recognized by the lib cache
argc--;
typedef GeckoProcessType (*XRE_StringToChildProcessType_t)(char*);
typedef nsresult (*XRE_InitChildProcess_t)(int, char**, GeckoProcessType);
XRE_StringToChildProcessType_t fXRE_StringToChildProcessType =
(XRE_StringToChildProcessType_t)__wrap_dlsym(xul_handle, "XRE_StringToChildProcessType");
XRE_InitChildProcess_t fXRE_InitChildProcess =
(XRE_InitChildProcess_t)__wrap_dlsym(xul_handle, "XRE_InitChildProcess");
GeckoProcessType proctype = fXRE_StringToChildProcessType(argv[--argc]);
nsresult rv = fXRE_InitChildProcess(argc, argv, proctype);
if (rv != 0)
return 1;
return 0;
}
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