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* tests/012/stack.tl: The (if stack-limited ...) test is not
correct because even if gerlimit indicates an unlimited stack,
we impose a defualt limit, and so (get-stack-limit) returns a
an integer value. The idea here was to try to skip this test
case when the stack usage is unlmited, which happens under
older versions of GNU make, before posix_spawn was introduced.
Instead, let's execute this test case only if we have
setrlimit. In the forked child, we try to impose a small stack
limit that will give use the stack overflow crash we are
testing for. The objective of the test case is to validate
that when (set-stack-limit 0) is called, the child will abort
due to a signal, rather than (recur) returning :so.
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* genman.txr (dupes, tagnum): Replace defvar with defvarl.
* stdlib/doc-lookup.tl (os-symbol): Same.
* tests/011/macros-3.tl (x): Same.
* tests/011/mandel.txr (x-centre, y-centre, width, i-max, j-max, n)
(r-max, pixel-size, x-offset, y-offset): Same.
(file, colour-max): Delete (unused) variables.
* tests/012/circ.tl (x): Replace defvar with defvarl.
* tests/012/stack.tl (stack-limited): Same.
* tests/012/struct.tl (s): Same.
* tests/013/maze.tl (vi, pa, sc): Delete variables. Use
function arguments instead.
(usage): Fix typo.
* tests/014/dgram-stream.tl (family): Rename to...
(*family*): ...this.
* tests/014/socket-basic.tl (socktype): Rename to...
(*socktype*): ...this.
(%iters%): Replace defvar with defvarl.
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* gc.c (gc_init): We must check rlim_cur for the RLIM_INFINITY
value indicating unlimited stack, and not misuse this value as a
limit number, otherwise hilarity ensues. This reproduced on
an older platform with make 3.81, which calls setrlimit to
bring about an unlimited stack, passed on to child processes.
Because of this txr segfaulted, as a consequence of a false
positive.
* tests/012/stack.tl (stack-limited): New variable which
indicates whether there is a stack limit. If there isn't, we
avoid running the fork-based test case. Also, we set the stack
limit to 32768 so we have a limit against which to run some of
the tests.
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* signal.c (sig_handler): For a is_cpu_exception signal, we
temporarily disable the stack limit. It might be executing on
the sigaltstack buffer, which is almost certainly below the
stack limit.
* tests/012/stack.tl: New test case. We raise a SIGSEGV
and check that in the handler, the stack limit is disabled,
and that we can executed code.
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* tests/012/stack.tl: New file.
* tets/common.tl (mvtest): New macro.
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