mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
252 lines
6.9 KiB
C++
252 lines
6.9 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "OpenFileFinder.h"
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#include "mozilla/FileUtils.h"
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#include "nsPrintfCString.h"
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#include <sys/stat.h>
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#include <errno.h>
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#undef USE_DEBUG
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#define USE_DEBUG 0
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#undef LOG
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#undef LOGW
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#undef ERR
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#define LOG(args...) __android_log_print(ANDROID_LOG_INFO, "OpenFileFinder", ## args)
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#define LOGW(args...) __android_log_print(ANDROID_LOG_WARN, "OpenFileFinder", ## args)
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#define ERR(args...) __android_log_print(ANDROID_LOG_ERROR, "OpenFileFinder", ## args)
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#undef DBG
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#if USE_DEBUG
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#define DBG(args...) __android_log_print(ANDROID_LOG_DEBUG, "OpenFileFinder" , ## args)
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#else
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#define DBG(args...)
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#endif
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namespace mozilla {
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namespace system {
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OpenFileFinder::OpenFileFinder(const nsACString& aPath,
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bool aCheckIsB2gOrDescendant /* = true */)
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: mPath(aPath),
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mProcDir(nullptr),
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mFdDir(nullptr),
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mPid(0),
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mCheckIsB2gOrDescendant(aCheckIsB2gOrDescendant)
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{
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// We assume that we're running in the parent process
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mMyPid = getpid();
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}
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OpenFileFinder::~OpenFileFinder()
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{
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Close();
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}
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bool
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OpenFileFinder::First(OpenFileFinder::Info* aInfo)
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{
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Close();
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mProcDir = opendir("/proc");
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if (!mProcDir) {
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return false;
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}
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mState = NEXT_PID;
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return Next(aInfo);
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}
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bool
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OpenFileFinder::Next(OpenFileFinder::Info* aInfo)
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{
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// NOTE: This function calls readdir and readlink, neither of which should
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// block since we're using the proc filesystem, which is a purely
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// kernel in-memory filesystem and doesn't depend on external driver
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// behaviour.
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while (mState != DONE) {
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switch (mState) {
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case NEXT_PID: {
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struct dirent *pidEntry;
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pidEntry = readdir(mProcDir);
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if (!pidEntry) {
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mState = DONE;
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break;
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}
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char *endPtr;
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mPid = strtol(pidEntry->d_name, &endPtr, 10);
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if (mPid == 0 || *endPtr != '\0') {
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// Not a +ve number - ignore
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continue;
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}
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// We've found a /proc/PID directory. Scan open file descriptors.
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if (mFdDir) {
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closedir(mFdDir);
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}
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nsPrintfCString fdDirPath("/proc/%d/fd", mPid);
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mFdDir = opendir(fdDirPath.get());
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if (!mFdDir) {
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continue;
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}
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mState = CHECK_FDS;
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}
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// Fall through
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case CHECK_FDS: {
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struct dirent *fdEntry;
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while((fdEntry = readdir(mFdDir))) {
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if (!strcmp(fdEntry->d_name, ".") ||
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!strcmp(fdEntry->d_name, "..")) {
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continue;
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}
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nsPrintfCString fdSymLink("/proc/%d/fd/%s", mPid, fdEntry->d_name);
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nsCString resolvedPath;
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if (ReadSymLink(fdSymLink, resolvedPath) && PathMatches(resolvedPath)) {
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// We found an open file contained within the directory tree passed
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// into the constructor.
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FillInfo(aInfo, resolvedPath);
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// If sCheckIsB2gOrDescendant is set false, the caller cares about
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// all processes which have open files. If sCheckIsB2gOrDescendant
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// is set false, we only care about the b2g proccess or its descendants.
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if (!mCheckIsB2gOrDescendant || aInfo->mIsB2gOrDescendant) {
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return true;
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}
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LOG("Ignore process(%d), not a b2g process or its descendant.",
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aInfo->mPid);
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}
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}
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// We've checked all of the files for this pid, move onto the next one.
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mState = NEXT_PID;
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continue;
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}
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case DONE:
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default:
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mState = DONE; // covers the default case
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break;
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}
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}
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return false;
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}
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void
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OpenFileFinder::Close()
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{
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if (mFdDir) {
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closedir(mFdDir);
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}
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if (mProcDir) {
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closedir(mProcDir);
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}
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}
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void
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OpenFileFinder::FillInfo(OpenFileFinder::Info* aInfo, const nsACString& aPath)
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{
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aInfo->mFileName = aPath;
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aInfo->mPid = mPid;
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nsPrintfCString exePath("/proc/%d/exe", mPid);
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ReadSymLink(exePath, aInfo->mExe);
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aInfo->mComm.Truncate();
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aInfo->mAppName.Truncate();
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nsPrintfCString statPath("/proc/%d/stat", mPid);
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nsCString statString;
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statString.SetLength(200);
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char *stat = statString.BeginWriting();
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if (!stat) {
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return;
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}
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ReadSysFile(statPath.get(), stat, statString.Length());
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// The stat line includes the comm field, surrounded by parenthesis.
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// However, the contents of the comm field itself is arbitrary and
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// and can include ')', so we search for the rightmost ) as being
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// the end of the comm field.
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char *closeParen = strrchr(stat, ')');
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if (!closeParen) {
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return;
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}
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char *openParen = strchr(stat, '(');
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if (!openParen) {
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return;
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}
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if (openParen >= closeParen) {
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return;
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}
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nsDependentCSubstring comm(&openParen[1], closeParen - openParen - 1);
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aInfo->mComm = comm;
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// There is a single character field after the comm and then
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// the parent pid (the field we're interested in).
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// ) X ppid
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// 01234
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int ppid = atoi(&closeParen[4]);
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if (mPid == mMyPid) {
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// This is chrome process
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aInfo->mIsB2gOrDescendant = true;
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DBG("Chrome process has open file(s)");
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return;
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}
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// For the rest (non-chrome process), we recursively check the ppid to know
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// it is a descendant of b2g or not. See bug 931456.
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while (ppid != mMyPid && ppid != 1) {
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DBG("Process(%d) is not forked from b2g(%d) or Init(1), keep looking",
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ppid, mMyPid);
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nsPrintfCString ppStatPath("/proc/%d/stat", ppid);
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ReadSysFile(ppStatPath.get(), stat, statString.Length());
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closeParen = strrchr(stat, ')');
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if (!closeParen) {
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return;
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}
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ppid = atoi(&closeParen[4]);
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}
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if (ppid == 1) {
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// This is a not a b2g process.
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DBG("Non-b2g process has open file(s)");
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aInfo->mIsB2gOrDescendant = false;
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return;
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}
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if (ppid == mMyPid) {
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// This is a descendant of b2g.
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DBG("Child process of chrome process has open file(s)");
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aInfo->mIsB2gOrDescendant = true;
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}
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// This looks like a content process. The comm field will be the
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// app name.
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aInfo->mAppName = aInfo->mComm;
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}
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bool
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OpenFileFinder::ReadSymLink(const nsACString& aSymLink, nsACString& aOutPath)
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{
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aOutPath.Truncate();
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const char *symLink = aSymLink.BeginReading();
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// Verify that we actually have a symlink.
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struct stat st;
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if (lstat(symLink, &st)) {
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return false;
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}
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if ((st.st_mode & S_IFMT) != S_IFLNK) {
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return false;
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}
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// Contrary to the documentation st.st_size doesn't seem to be a reliable
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// indication of the length when reading from /proc, so we use a fixed
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// size buffer instead.
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char resolvedSymLink[PATH_MAX];
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ssize_t pathLength = readlink(symLink, resolvedSymLink,
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sizeof(resolvedSymLink) - 1);
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if (pathLength <= 0) {
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return false;
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}
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resolvedSymLink[pathLength] = '\0';
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aOutPath.Assign(resolvedSymLink);
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return true;
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}
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} // system
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} // mozilla
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