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-rw-r--r--dom/system/gonk/OpenFileFinder.cpp251
1 files changed, 0 insertions, 251 deletions
diff --git a/dom/system/gonk/OpenFileFinder.cpp b/dom/system/gonk/OpenFileFinder.cpp
deleted file mode 100644
index 388e813e1..000000000
--- a/dom/system/gonk/OpenFileFinder.cpp
+++ /dev/null
@@ -1,251 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "OpenFileFinder.h"
-
-#include "mozilla/FileUtils.h"
-#include "nsPrintfCString.h"
-
-#include <sys/stat.h>
-#include <errno.h>
-
-#undef USE_DEBUG
-#define USE_DEBUG 0
-
-#undef LOG
-#undef LOGW
-#undef ERR
-#define LOG(args...) __android_log_print(ANDROID_LOG_INFO, "OpenFileFinder", ## args)
-#define LOGW(args...) __android_log_print(ANDROID_LOG_WARN, "OpenFileFinder", ## args)
-#define ERR(args...) __android_log_print(ANDROID_LOG_ERROR, "OpenFileFinder", ## args)
-
-#undef DBG
-#if USE_DEBUG
-#define DBG(args...) __android_log_print(ANDROID_LOG_DEBUG, "OpenFileFinder" , ## args)
-#else
-#define DBG(args...)
-#endif
-
-namespace mozilla {
-namespace system {
-
-OpenFileFinder::OpenFileFinder(const nsACString& aPath,
- bool aCheckIsB2gOrDescendant /* = true */)
- : mPath(aPath),
- mProcDir(nullptr),
- mFdDir(nullptr),
- mPid(0),
- mCheckIsB2gOrDescendant(aCheckIsB2gOrDescendant)
-{
- // We assume that we're running in the parent process
- mMyPid = getpid();
-}
-
-OpenFileFinder::~OpenFileFinder()
-{
- Close();
-}
-
-bool
-OpenFileFinder::First(OpenFileFinder::Info* aInfo)
-{
- Close();
-
- mProcDir = opendir("/proc");
- if (!mProcDir) {
- return false;
- }
- mState = NEXT_PID;
- return Next(aInfo);
-}
-
-bool
-OpenFileFinder::Next(OpenFileFinder::Info* aInfo)
-{
- // NOTE: This function calls readdir and readlink, neither of which should
- // block since we're using the proc filesystem, which is a purely
- // kernel in-memory filesystem and doesn't depend on external driver
- // behaviour.
- while (mState != DONE) {
- switch (mState) {
- case NEXT_PID: {
- struct dirent *pidEntry;
- pidEntry = readdir(mProcDir);
- if (!pidEntry) {
- mState = DONE;
- break;
- }
- char *endPtr;
- mPid = strtol(pidEntry->d_name, &endPtr, 10);
- if (mPid == 0 || *endPtr != '\0') {
- // Not a +ve number - ignore
- continue;
- }
- // We've found a /proc/PID directory. Scan open file descriptors.
- if (mFdDir) {
- closedir(mFdDir);
- }
- nsPrintfCString fdDirPath("/proc/%d/fd", mPid);
- mFdDir = opendir(fdDirPath.get());
- if (!mFdDir) {
- continue;
- }
- mState = CHECK_FDS;
- }
- // Fall through
- case CHECK_FDS: {
- struct dirent *fdEntry;
- while((fdEntry = readdir(mFdDir))) {
- if (!strcmp(fdEntry->d_name, ".") ||
- !strcmp(fdEntry->d_name, "..")) {
- continue;
- }
- nsPrintfCString fdSymLink("/proc/%d/fd/%s", mPid, fdEntry->d_name);
- nsCString resolvedPath;
- if (ReadSymLink(fdSymLink, resolvedPath) && PathMatches(resolvedPath)) {
- // We found an open file contained within the directory tree passed
- // into the constructor.
- FillInfo(aInfo, resolvedPath);
- // If sCheckIsB2gOrDescendant is set false, the caller cares about
- // all processes which have open files. If sCheckIsB2gOrDescendant
- // is set false, we only care about the b2g proccess or its descendants.
- if (!mCheckIsB2gOrDescendant || aInfo->mIsB2gOrDescendant) {
- return true;
- }
- LOG("Ignore process(%d), not a b2g process or its descendant.",
- aInfo->mPid);
- }
- }
- // We've checked all of the files for this pid, move onto the next one.
- mState = NEXT_PID;
- continue;
- }
- case DONE:
- default:
- mState = DONE; // covers the default case
- break;
- }
- }
- return false;
-}
-
-void
-OpenFileFinder::Close()
-{
- if (mFdDir) {
- closedir(mFdDir);
- }
- if (mProcDir) {
- closedir(mProcDir);
- }
-}
-
-void
-OpenFileFinder::FillInfo(OpenFileFinder::Info* aInfo, const nsACString& aPath)
-{
- aInfo->mFileName = aPath;
- aInfo->mPid = mPid;
- nsPrintfCString exePath("/proc/%d/exe", mPid);
- ReadSymLink(exePath, aInfo->mExe);
- aInfo->mComm.Truncate();
- aInfo->mAppName.Truncate();
- nsPrintfCString statPath("/proc/%d/stat", mPid);
- nsCString statString;
- statString.SetLength(200);
- char *stat = statString.BeginWriting();
- if (!stat) {
- return;
- }
- ReadSysFile(statPath.get(), stat, statString.Length());
- // The stat line includes the comm field, surrounded by parenthesis.
- // However, the contents of the comm field itself is arbitrary and
- // and can include ')', so we search for the rightmost ) as being
- // the end of the comm field.
- char *closeParen = strrchr(stat, ')');
- if (!closeParen) {
- return;
- }
- char *openParen = strchr(stat, '(');
- if (!openParen) {
- return;
- }
- if (openParen >= closeParen) {
- return;
- }
- nsDependentCSubstring comm(&openParen[1], closeParen - openParen - 1);
- aInfo->mComm = comm;
- // There is a single character field after the comm and then
- // the parent pid (the field we're interested in).
- // ) X ppid
- // 01234
- int ppid = atoi(&closeParen[4]);
-
- if (mPid == mMyPid) {
- // This is chrome process
- aInfo->mIsB2gOrDescendant = true;
- DBG("Chrome process has open file(s)");
- return;
- }
- // For the rest (non-chrome process), we recursively check the ppid to know
- // it is a descendant of b2g or not. See bug 931456.
- while (ppid != mMyPid && ppid != 1) {
- DBG("Process(%d) is not forked from b2g(%d) or Init(1), keep looking",
- ppid, mMyPid);
- nsPrintfCString ppStatPath("/proc/%d/stat", ppid);
- ReadSysFile(ppStatPath.get(), stat, statString.Length());
- closeParen = strrchr(stat, ')');
- if (!closeParen) {
- return;
- }
- ppid = atoi(&closeParen[4]);
- }
- if (ppid == 1) {
- // This is a not a b2g process.
- DBG("Non-b2g process has open file(s)");
- aInfo->mIsB2gOrDescendant = false;
- return;
- }
- if (ppid == mMyPid) {
- // This is a descendant of b2g.
- DBG("Child process of chrome process has open file(s)");
- aInfo->mIsB2gOrDescendant = true;
- }
-
- // This looks like a content process. The comm field will be the
- // app name.
- aInfo->mAppName = aInfo->mComm;
-}
-
-bool
-OpenFileFinder::ReadSymLink(const nsACString& aSymLink, nsACString& aOutPath)
-{
- aOutPath.Truncate();
- const char *symLink = aSymLink.BeginReading();
-
- // Verify that we actually have a symlink.
- struct stat st;
- if (lstat(symLink, &st)) {
- return false;
- }
- if ((st.st_mode & S_IFMT) != S_IFLNK) {
- return false;
- }
-
- // Contrary to the documentation st.st_size doesn't seem to be a reliable
- // indication of the length when reading from /proc, so we use a fixed
- // size buffer instead.
-
- char resolvedSymLink[PATH_MAX];
- ssize_t pathLength = readlink(symLink, resolvedSymLink,
- sizeof(resolvedSymLink) - 1);
- if (pathLength <= 0) {
- return false;
- }
- resolvedSymLink[pathLength] = '\0';
- aOutPath.Assign(resolvedSymLink);
- return true;
-}
-
-} // system
-} // mozilla
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