message: Fix definition of SIG_ERR
diff: @@ -23,7 +23,7 @@ type SigSet = BitSet<[c_ulong; 1]>;
  pub const SIG_DFL: usize = 0;
  pub const SIG_IGN: usize = 1;
  -pub const SIG_ERR: usize = !0;
  +pub const SIG_ERR: isize = -1;
  pub const SIG_BLOCK: c_int = 0;
  pub const SIG_UNBLOCK: c_int = 1;
  