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1e15bf9664
(ENOTSUP): Define if errno.h doesn't. (SA_NODEFER, SA_ONSTACK, SA_RESETHAND, SA_SIGINFO, SIGSTKSZ, _SC_PAGESIZE, ALTERNATE_STACK_SIZE, stack_t, sigaltstack): Remove; we now assume them all when HAVE_XSI_STACK_OVERFLOW_HEURISTIC, so we don't need substitutes. (<ucontext.h>): Include only if HAVE_XSI_STACK_OVERFLOW_HEURISTIC. (alternate_signal_stack): Now of size SIGSTKSZ, not ALTERNATE_STACK_SIZE. (segv_handler): Simplify, under the assumption that HAVE_XSI_STACK_OVERFLOW_HEURISTIC is nonzero. (c_stack_action): Likewise. (exit_failure) [DEBUG]: Initialize to 0, not 1. (recurse, main) [DEBUG]: Remove main args.
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