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Many are now obtained via bootstrap from gnulib.
Others (ms/) were not being maintained.
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Do not assume SA_SIGINFO behavior.
Bug reported by Jim Meyering on NetBSD 1.5.2.
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(EOVERFLOW): Define if not defined.(stack_t): Define to struct sigaltstack if not defined or declared.
Include <sys/resource.h>, <ucontext.h> if available.
Include <stdio.h> if DEBUG.
Do not include <inttypes.h> or <stdint.h>.
(c_stack_die): Remove info and context args. All uses changed.
(segv_action): Likewise.
(alternate_signal_stack): Change uintmax_t to long, to ease porting.
(get_stack_location, min_address_from_argv, max_address_from_argv,
null_action): New functions.
(stack_base, stack_size): New vars.
(segv_handler): context arg may not be used.
Use global stack_base, stack_size if
! HAVE_XSI_STACK_OVERFLOW_HEURISTIC.
Add debug code.
Invoke die (rather than segv_action) to exit.
(c_stack_action): Accept new argv arg, and simpler handler arg.
All uses changed. Move code into new functions above.
Allow null action.
[! (defined SA_ONSTACK && defined _SC_PAGESIZE)]: Assume all segvs
are stack overflows.
(main) [DEBUG]: Describe what output should be like.
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Bug reported by Eli Zaretskii.
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(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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