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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "sysdeps.h"
bool set_tcp_keepalive(int fd, int interval_sec) {
int enable = (interval_sec > 0);
if (adb_setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &enable, sizeof(enable))) {
return false;
}
if (!enable) {
return true;
}
// Idle time before sending the first keepalive is TCP_KEEPIDLE on Linux, TCP_KEEPALIVE on Mac.
#if defined(TCP_KEEPIDLE)
if (adb_setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &interval_sec, sizeof(interval_sec))) {
return false;
}
#elif defined(TCP_KEEPALIVE)
if (adb_setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE, &interval_sec, sizeof(interval_sec))) {
return false;
}
#endif
// TCP_KEEPINTVL and TCP_KEEPCNT are available on Linux 2.4+ and OS X 10.8+ (Mountain Lion).
#if defined(TCP_KEEPINTVL)
if (adb_setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &interval_sec, sizeof(interval_sec))) {
return false;
}
#endif
#if defined(TCP_KEEPCNT)
// On Windows this value is hardcoded to 10. This is a reasonable value, so we do the same here
// to match behavior. See SO_KEEPALIVE documentation at
// https://msdn.microsoft.com/en-us/library/windows/desktop/ee470551(v=vs.85).aspx.
const int keepcnt = 10;
if (adb_setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &keepcnt, sizeof(keepcnt))) {
return false;
}
#endif
return true;
}
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