On Saturday, 9 November 2019 at 12:56:52 UTC, Dennis wrote:

Put an ampersand before the function to get its address:
  signal.signal(SIGWINCH,cast(void function(int)) &set_winch);

In C you can omit the & when taking a function address, but when you do that in D it tries to call the function and cast the return value of the function instead.

Bingo! That worked. The modified code is:

int winch;
extern(C) void set_winch(int sig) nothrow @nogc @system {
  enum SIGWINCH = 28;
  winch = sig;


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