/// <summary>
/// Open file descriptor (SD_LISTEN_FDS_START) initialized by systemd socket-based activation logic if available.
/// Specify callback to configure endpoint-specific settings.
/// </summary>
/// <returns>
/// The <see cref="KestrelServerOptions"/>.
/// </returns>
public static KestrelServerOptions UseSystemd(this KestrelServerOptions options, Action <ListenOptions> configure)
{
if (string.Equals(Process.GetCurrentProcess().Id.ToString(CultureInfo.InvariantCulture), Environment.GetEnvironmentVariable(ListenPidEnvVar), StringComparison.Ordinal))
{
options.ListenHandle(SdListenFdsStart, configure);
}
return(options);
}
/// <summary>
/// Open file descriptors (starting from SD_LISTEN_FDS_START) initialized by systemd socket-based activation logic if available.
/// Specify callback to configure endpoint-specific settings.
/// </summary>
/// <returns>
/// The <see cref="KestrelServerOptions"/>.
/// </returns>
public static KestrelServerOptions UseSystemd(this KestrelServerOptions options, Action <ListenOptions> configure)
{
if (string.Equals(Environment.ProcessId.ToString(CultureInfo.InvariantCulture), Environment.GetEnvironmentVariable(ListenPidEnvVar), StringComparison.Ordinal))
{
// This matches sd_listen_fds behavior that requires %LISTEN_FDS% to be present and in range [1;INT_MAX-SD_LISTEN_FDS_START]
if (int.TryParse(Environment.GetEnvironmentVariable(ListenFdsEnvVar), NumberStyles.None, NumberFormatInfo.InvariantInfo, out var listenFds) &&
listenFds > 0 &&
listenFds <= int.MaxValue - SdListenFdsStart)
{
for (var handle = SdListenFdsStart; handle < SdListenFdsStart + listenFds; ++handle)
{
options.ListenHandle((ulong)handle, configure);
}
}
}
return(options);
}
