Add set_resource_limit.

GitOrigin-RevId: 29cf122b31ff86ccc8f6c1fc3b71c28e89b8054f

tdutils/CMakeLists.txt

@@ -58,6 +58,7 @@ set(TDUTILS_SOURCE
   td/utils/port/MemoryMapping.cpp
   td/utils/port/path.cpp
   td/utils/port/PollFlags.cpp
+  td/utils/port/rlimit.cpp
   td/utils/port/ServerSocketFd.cpp
   td/utils/port/signals.cpp
   td/utils/port/sleep.cpp
@@ -133,6 +134,7 @@ set(TDUTILS_SOURCE
   td/utils/port/Poll.h
   td/utils/port/PollBase.h
   td/utils/port/PollFlags.h
+  td/utils/port/rlimit.h
   td/utils/port/RwMutex.h
   td/utils/port/ServerSocketFd.h
   td/utils/port/signals.h

tdutils/td/utils/port/rlimit.cpp

@@ -0,0 +1,57 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#include "td/utils/port/rlimit.h"
+
+#include "td/utils/port/config.h"
+
+#include "td/utils/misc.h"
+
+#if TD_PORT_POSIX
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#endif
+
+namespace td {
+
+#if TD_PORT_POSIX
+static int get_resource(ResourceLimitType type) {
+  switch (type) {
+    case ResourceLimitType::NoFile:
+      return RLIMIT_NOFILE;
+    default:
+      UNREACHABLE();
+      return -1;
+  }
+}
+#endif
+
+Status set_resource_limit(ResourceLimitType type, uint64 value) {
+#if TD_PORT_POSIX
+  int resource = get_resource(type);
+
+  rlimit rlim;
+  if (getrlimit(resource, &rlim) == -1) {
+    return OS_ERROR("Failed to get current resource limit");
+  }
+
+  TRY_RESULT(new_value, narrow_cast_safe<rlim_t>(value));
+  if (rlim.rlim_max < new_value) {
+    rlim.rlim_max = new_value;
+  }
+  rlim.rlim_cur = new_value;
+
+  if (setrlimit(resource, &rlim) < 0) {
+    return OS_ERROR("Failed to set resource limit");
+  }
+  return Status::OK();
+#elif TD_PORT_WINDOWS
+  return Status::OK();  // Windows has no limits
+#endif
+}
+
+}  // namespace td

tdutils/td/utils/port/rlimit.h

@@ -0,0 +1,18 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#pragma once
+
+#include "td/utils/common.h"
+#include "td/utils/Status.h"
+
+namespace td {
+
+enum class ResourceLimitType { NoFile };
+
+Status set_resource_limit(ResourceLimitType type, uint64 value);
+
+}  // namespace td