iOS: System.Net.NetworkInformation.Ping.Send throws System.Net.NetworkInformation.PingException: An exception occurred during a Ping request.

[rolfbjarne]

Description

Repro:

var p = new Ping ();
p.Send ("localhost");

result:

<System.Net.NetworkInformation.PingException: An exception occurred during a Ping request.
 ---> System.ComponentModel.Win32Exception (2): No such file or directory
   at System.Diagnostics.Process.EnsureInitialized()
   at System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo)
   at System.Diagnostics.Process.Start()
   at System.Net.NetworkInformation.Ping.SendWithPingUtility(IPAddress address, Byte[] buffer, Int32 timeout, PingOptions options)
   at System.Net.NetworkInformation.Ping.SendPingCore(IPAddress address, Byte[] buffer, Int32 timeout, PingOptions options)
   at System.Net.NetworkInformation.Ping.GetAddressAndSend(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options)
   --- End of inner exception stack trace ---
   at System.Net.NetworkInformation.Ping.GetAddressAndSend(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options)
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options)
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer)
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress)
   at LinkSdk.DllImportTest.<>c__DisplayClass3_0.<LackOfCapget>b__0() in [...]/xamarin-macios/tests/linker/ios/link sdk/DllImportTest.cs:line 88

I'm not sure what the behavior/result should be (the ideal is probably that it should just work, but that would probably need a very different implementation - see also https://xamarin.github.io/bugzilla-archives/96/964/bug.html), but I don't think it should be a PingException. Maybe a PlatformNotSupportedException?

The stack trace also shows that the current code tries to launch another process. That doesn't work on any of Apple's mobile platforms. Most of the System.Diagnostics.Process class should probably just throw PlatformNotSupportedException.

Configuration

.NET 5.0.100-rc.1.20414.5
iOS BCL (microsoft.netcore.app.runtime.ios-x64/5.0.0-rc.1.20404.16)

[ghost]

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[wfurt]

This dup of #36890 and #36941.
PNSP is reasonable to me. I don't think #36941 will get done for 5.0.

cc: @marek-safar

[marek-safar]

Closing as duplicate of #36941.