[exit]

this is fantastic, but apparently "void (signal(int, void (fp)(int)))(int);" is a syntax error?

[loup-vaillant]

It is not, but their implementation is incomplete. They parse it correctly when you remove "fp". Apparently, they don't handle declarations which have another identifiers besides the one that is declared.

  int f(int  ) // OK
  int f(int i) // fail