Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 298 insertions, 0 deletions

diff --git a/toolkit/components/processtools/ProcInfo_linux.cpp b/toolkit/components/processtools/ProcInfo_linux.cpp
new file mode 100644
index 0000000000..4483147445
--- /dev/null
+++ b/toolkit/components/processtools/ProcInfo_linux.cpp
@@ -0,0 +1,298 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "mozilla/ProcInfo.h"
+#include "mozilla/Sprintf.h"
+#include "mozilla/Logging.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/ipc/GeckoChildProcessHost.h"
+#include "nsLocalFile.h"
+#include "nsMemoryReporterManager.h"
+#include "nsNetCID.h"
+#include "nsWhitespaceTokenizer.h"
+
+#include <cstdio>
+#include <cstring>
+#include <unistd.h>
+#include <dirent.h>
+
+#define NANOPERSEC 1000000000.
+
+namespace mozilla {
+
+// StatReader can parse and tokenize a POSIX stat file.
+// see http://man7.org/linux/man-pages/man5/proc.5.html
+//
+// Its usage is quite simple:
+//
+// StatReader reader(pid);
+// ProcInfo info;
+// rv = reader.ParseProc(info);
+// if (NS_FAILED(rv)) {
+//     // the reading of the file or its parsing failed.
+// }
+//
+class StatReader {
+ public:
+  explicit StatReader(const base::ProcessId aPid)
+      : mPid(aPid), mMaxIndex(53), mTicksPerSec(sysconf(_SC_CLK_TCK)) {
+    mFilepath.AppendPrintf("/proc/%u/stat", mPid);
+  }
+
+  nsresult ParseProc(ProcInfo& aInfo) {
+    nsAutoString fileContent;
+    nsresult rv = ReadFile(fileContent);
+    NS_ENSURE_SUCCESS(rv, rv);
+    // We first extract the filename
+    int32_t startPos = fileContent.RFindChar('(');
+    if (startPos == -1) {
+      return NS_ERROR_FAILURE;
+    }
+    int32_t endPos = fileContent.RFindChar(')');
+    if (endPos == -1) {
+      return NS_ERROR_FAILURE;
+    }
+    int32_t len = endPos - (startPos + 1);
+    aInfo.filename.Assign(Substring(fileContent, startPos + 1, len));
+
+    // now we can use the tokenizer for the rest of the file
+    nsWhitespaceTokenizer tokenizer(Substring(fileContent, endPos + 2));
+    int32_t index = 2;  // starting at third field
+    while (tokenizer.hasMoreTokens() && index < mMaxIndex) {
+      const nsAString& token = tokenizer.nextToken();
+      rv = UseToken(index, token, aInfo);
+      NS_ENSURE_SUCCESS(rv, rv);
+      index++;
+    }
+    return NS_OK;
+  }
+
+ protected:
+  // Called for each token found in the stat file.
+  nsresult UseToken(int32_t aIndex, const nsAString& aToken, ProcInfo& aInfo) {
+    // We're using a subset of what stat has to offer for now.
+    nsresult rv = NS_OK;
+    // see the proc documentation for fields index references.
+    switch (aIndex) {
+      case 13:
+        // Amount of time that this process has been scheduled
+        // in user mode, measured in clock ticks
+        aInfo.cpuUser = GetCPUTime(aToken, &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+        break;
+      case 14:
+        // Amount of time that this process has been scheduled
+        // in kernel mode, measured in clock ticks
+        aInfo.cpuKernel = GetCPUTime(aToken, &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+        break;
+      case 23:
+        // Resident Set Size: number of pages the process has
+        // in real memory.
+        uint64_t pageCount = Get64Value(aToken, &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+        uint64_t pageSize = sysconf(_SC_PAGESIZE);
+        aInfo.residentSetSize = pageCount * pageSize;
+        break;
+    }
+    return rv;
+  }
+
+  // Converts a token into a int64_t
+  uint64_t Get64Value(const nsAString& aToken, nsresult* aRv) {
+    // We can't use aToken.ToInteger64() since it returns a signed 64.
+    // and that can result into an overflow.
+    nsresult rv = NS_OK;
+    uint64_t out = 0;
+    if (sscanf(NS_ConvertUTF16toUTF8(aToken).get(), "%" PRIu64, &out) == 0) {
+      rv = NS_ERROR_FAILURE;
+    }
+    *aRv = rv;
+    return out;
+  }
+
+  // Converts a token into CPU time in nanoseconds.
+  uint64_t GetCPUTime(const nsAString& aToken, nsresult* aRv) {
+    nsresult rv;
+    uint64_t value = Get64Value(aToken, &rv);
+    *aRv = rv;
+    if (NS_FAILED(rv)) {
+      return 0;
+    }
+    if (value) {
+      value = (value * NANOPERSEC) / mTicksPerSec;
+    }
+    return value;
+  }
+
+  base::ProcessId mPid;
+  int32_t mMaxIndex;
+  nsCString mFilepath;
+  ProcInfo mProcInfo;
+
+ private:
+  // Reads the stat file and puts its content in a nsString.
+  nsresult ReadFile(nsAutoString& aFileContent) {
+    RefPtr<nsLocalFile> file = new nsLocalFile(mFilepath);
+    bool exists;
+    nsresult rv = file->Exists(&exists);
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (!exists) {
+      return NS_ERROR_FAILURE;
+    }
+    // /proc is a virtual file system and all files are
+    // of size 0, so GetFileSize() and related functions will
+    // return 0 - so the way to read the file is to fill a buffer
+    // of an arbitrary big size and look for the end of line char.
+    FILE* fstat;
+    if (NS_FAILED(file->OpenANSIFileDesc("r", &fstat)) || !fstat) {
+      return NS_ERROR_FAILURE;
+    }
+    char buffer[2048];
+    char* end;
+    char* start = fgets(buffer, 2048, fstat);
+    fclose(fstat);
+    if (start == nullptr) {
+      return NS_ERROR_FAILURE;
+    }
+    // let's find the end
+    end = strchr(buffer, '\n');
+    if (!end) {
+      return NS_ERROR_FAILURE;
+    }
+    aFileContent.AssignASCII(buffer, size_t(end - start));
+    return NS_OK;
+  }
+
+  int64_t mTicksPerSec;
+};
+
+// Threads have the same stat file. The only difference is its path
+// and we're getting less info in the ThreadInfo structure.
+class ThreadInfoReader final : public StatReader {
+ public:
+  ThreadInfoReader(const base::ProcessId aPid, const base::ProcessId aTid)
+      : StatReader(aPid), mTid(aTid) {
+    // Adding the thread path
+    mFilepath.Truncate();
+    mFilepath.AppendPrintf("/proc/%u/task/%u/stat", aPid, mTid);
+    mMaxIndex = 17;
+  }
+
+  nsresult ParseThread(ThreadInfo& aInfo) {
+    ProcInfo info;
+    nsresult rv = StatReader::ParseProc(info);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    aInfo.tid = mTid;
+    // Copying over the data we got from StatReader::ParseProc()
+    aInfo.cpuKernel = info.cpuKernel;
+    aInfo.cpuUser = info.cpuUser;
+    aInfo.name.Assign(info.filename);
+    return NS_OK;
+  }
+
+ private:
+  base::ProcessId mTid;
+};
+
+RefPtr<ProcInfoPromise> GetProcInfo(nsTArray<ProcInfoRequest>&& aRequests) {
+  auto holder = MakeUnique<MozPromiseHolder<ProcInfoPromise>>();
+  RefPtr<ProcInfoPromise> promise = holder->Ensure(__func__);
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIEventTarget> target =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to get stream transport service");
+    holder->Reject(rv, __func__);
+    return promise;
+  }
+
+  RefPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      __func__,
+      [holder = std::move(holder), requests = std::move(aRequests)]() {
+        HashMap<base::ProcessId, ProcInfo> gathered;
+        if (!gathered.reserve(requests.Length())) {
+          holder->Reject(NS_ERROR_OUT_OF_MEMORY, __func__);
+          return;
+        }
+        for (const auto& request : requests) {
+          // opening the stat file and reading its content
+          StatReader reader(request.pid);
+          ProcInfo info;
+          nsresult rv = reader.ParseProc(info);
+          if (NS_FAILED(rv)) {
+            // Can't read data for this proc.
+            // Probably either a sandboxing issue or a race condition, e.g.
+            // the process has been just been killed. Regardless, skip process.
+            continue;
+          }
+          // Computing the resident unique size is somewhat tricky,
+          // so we use about:memory's implementation. This implementation
+          // reopens `/proc/[pid]`, so there is the risk of an additional
+          // race condition. In that case, the result is `0`.
+          info.residentUniqueSize =
+              nsMemoryReporterManager::ResidentUnique(request.pid);
+
+          // Extra info
+          info.pid = request.pid;
+          info.childId = request.childId;
+          info.type = request.processType;
+          info.origin = request.origin;
+          info.windows = std::move(request.windowInfo);
+
+          // Let's look at the threads
+          nsCString taskPath;
+          taskPath.AppendPrintf("/proc/%u/task", request.pid);
+          DIR* dirHandle = opendir(taskPath.get());
+          if (!dirHandle) {
+            // For some reason, we have no data on the threads for this process.
+            // Most likely reason is that we have just lost a race condition and
+            // the process is dead.
+            // Let's stop here and ignore the entire process.
+            continue;
+          }
+          auto cleanup = mozilla::MakeScopeExit([&] { closedir(dirHandle); });
+
+          // If we can't read some thread info, we ignore that thread.
+          dirent* entry;
+          while ((entry = readdir(dirHandle)) != nullptr) {
+            if (entry->d_name[0] == '.') {
+              continue;
+            }
+            // Threads have a stat file, like processes.
+            nsAutoCString entryName(entry->d_name);
+            int32_t tid = entryName.ToInteger(&rv);
+            if (NS_FAILED(rv)) {
+              continue;
+            }
+            ThreadInfoReader reader(request.pid, tid);
+            ThreadInfo threadInfo;
+            rv = reader.ParseThread(threadInfo);
+            if (NS_FAILED(rv)) {
+              continue;
+            }
+            info.threads.AppendElement(threadInfo);
+          }
+
+          if (!gathered.put(request.pid, std::move(info))) {
+            holder->Reject(NS_ERROR_OUT_OF_MEMORY, __func__);
+            return;
+          }
+        }
+
+        // ... and we're done!
+        holder->Resolve(std::move(gathered), __func__);
+      });
+
+  rv = target->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to dispatch the LoadDataRunnable.");
+  }
+  return promise;
+}
+
+}  // namespace mozilla