import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

xpcom/base/LinuxUtils.cpp

@@ -0,0 +1,50 @@
+/* -*- 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 "LinuxUtils.h"
+
+#if defined(XP_LINUX)
+
+#include <ctype.h>
+#include <stdio.h>
+
+#include "nsPrintfCString.h"
+
+namespace mozilla {
+
+void
+LinuxUtils::GetThreadName(pid_t aTid, nsACString& aName)
+{
+  aName.Truncate();
+  if (aTid <= 0) {
+    return;
+  }
+
+  const size_t kBuffSize = 16; // 15 chars max + '\n'
+  char buf[kBuffSize];
+  nsPrintfCString path("/proc/%d/comm", aTid);
+  FILE* fp = fopen(path.get(), "r");
+  if (!fp) {
+    // The fopen could also fail if the thread exited before we got here.
+    return;
+  }
+
+  size_t len = fread(buf, 1, kBuffSize, fp);
+  fclose(fp);
+
+  // No need to strip the '\n', since isspace() includes it.
+  while (len > 0 &&
+         (isspace(buf[len - 1]) || isdigit(buf[len - 1]) ||
+          buf[len - 1] == '#' || buf[len - 1] == '_')) {
+    --len;
+  }
+
+  aName.Assign(buf, len);
+}
+
+}
+
+#endif // XP_LINUX