csh: replace malloc(x * y) and realloc(x * y) with reallocarray

Don't cast the value returned from *malloc. No change to compiler output.

PR/53837: Michael Scholz: src/bin/csh/func.c from current has a superfluous
fprintf

Welcome to the 21th century csh: retire "ptr_t" now that we have "void *"

Remove Free, s/xfree/free/.

Standard C says that free should be a no-op for a NULL pointer, so
we don't need an extra function to do this.

While here, add an XXX about a wrong sounding comment

WARNS=6 [-Wconversion]

support RLIMIT_NTHR

NULL does not need a cast

- add new RLIMIT_AS (aka RLIMIT_VMEM) resource that limits the total
address space available to processes. this limit exists in most other
modern unix variants, and like most of them, our defaults a

- add new RLIMIT_AS (aka RLIMIT_VMEM) resource that limits the total
address space available to processes. this limit exists in most other
modern unix variants, and like most of them, our defaults are unlimited.
remove the old mmap / rlimit.datasize hack.

- adds the VMCMD_STACK flag to all the stack-creation vmcmd callers.
it is currently unused, but was added a few years ago.

- add a pair of new process size values to kinfo_proc2{}. one is the
total size of the process memory map, and the other is the total size
adjusted for unused stack space (since most processes have a lot of
this...)

- patch sh, and csh to notice RLIMIT_AS. (in some cases, the alias
RLIMIT_VMEM was already present and used if availble.)

- patch ps, top and systat to notice the new k_vm_vsize member of
kinfo_proc2{}.

- update irix, svr4, svr4_32, linux and osf1 emulations to support
this information. (freebsd could be done, but that it's best left
as part of the full-update of compat/freebsd.)


this addresses PR 7897. it also gives correct memory usage values,
which have never been entirely correct (since mmap), and have been
very incorrect since jemalloc() was enabled.

tested on i386 and sparc64, build tested on several other platforms.

thanks to many folks for feedback and testing but most espcially
chuq and yamt for critical suggestions that lead to this patch not
having a special ugliness i wasn't happy with anyway :-)

show more ...

Needs errno.h if !gcc.

no need to have cshbool; just make them int

PR/36650: Michael van Elst: Get rid of bool, because csh uses bool as a small
int.

Rename bool -> cshbool; despite the name, bool actually holds values other
than 0 or 1. Fixes PR/36650.

fix typos

Coverity CID 1228: protect against calling close with negative value.

sprinkle a little const, and now everything compiles with WARNS=3

Keep track of the while level, when popping loops because of a breaksw.
This is nasty...

understand rlimit sbsize

Handle breaksw inside while loop (from tcsh)
Really: test commits on new cvs binary.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22249, verified by myself.

Rename `sigset' locals to avoid symbol shadowing warning.

Since we have rlim_t, use it.
Approved by kleink.

__STDC__ is always defined on NetBSD.

make sure that rlim_cur >= rlim_max in all the setrlimit(2) cases.

ANSIfication and KNF improvements by Petri Koistinen in bin/13689,
with some fixes by me.