Provide the location of an alternate signal handler stack.
Source position: sighndh.inc line 89
| type tsigaltstack = record | ||
| ss_sp: pointer; | 
 | Stack pointer. | 
| ss_flags: LongInt; | 
 | Flags. | 
| ss_size: LongInt; | 
 | Size of the alternate stack. | 
| end; |