fix Issue 11983 - RDMD masks out segmentation faults

[WalterBright]

https://d.puremagic.com/issues/show_bug.cgi?id=11983

[CyberShadow]

So now it masks an identifiable exit code with an unidentifiable one? Hardly an improvement.

The user is expecting rdmd to behave like the shell, which is IMO an invalid issue. But if we are to cater to that, rdmd should at least return the exit code the user expects, and mimic the shell's behavior (which is, again, questionable IMO).

[CyberShadow]

An actual fix would be to use the system exec call to actually replace the current process with the user's program, on systems which support it (not Windows). Then the signal/exit code/etc. is passed to the shell directly.

[WalterBright]

Suggest some code, please. This is marked as a regression, and so needs a fix shortly. (Though I am not convinced it really is a regression.)

[CyberShadow]

Fair enough, since it was me who broke it ;)

#112

[WalterBright]

I like your fix better.