Improve memory safety

This commit makes numerous refinements to cosmopolitan memory handling.

The default stack size has been reduced from 2mb to 128kb. A new macro
is now provided so you can easily reconfigure the stack size to be any
value you want. Work around the breaking change by adding to your main:

    STATIC_STACK_SIZE(0x00200000);  // 2mb stack

If you're not sure how much stack you need, then you can use:

    STATIC_YOINK("stack_usage_logging");

After which you can `sort -nr o/$MODE/stack.log`. Based on the unit test
suite, nothing in the Cosmopolitan repository (except for Python) needs
a stack size greater than 30kb. There are also new macros for detecting
the size and address of the stack at runtime, e.g. GetStackAddr(). We
also now support sigaltstack() so if you want to see nice looking crash
reports whenever a stack overflow happens, you can put this in main():

    ShowCrashReports();

Under `make MODE=dbg` and `make MODE=asan` the unit testing framework
will now automatically print backtraces of memory allocations when
things like memory leaks happen. Bugs are now fixed in ASAN global
variable overrun detection. The memtrack and asan runtimes also handle
edge cases now. The new tools helped to identify a few memory leaks,
which are fixed by this change.

This change should fix an issue reported in #288 with ARG_MAX limits.
Fixing this doubled the performance of MKDEPS.COM and AR.COM yet again.

libc/sock/mapdoserrortoerrno.c

@@ -1,175 +0,0 @@
-/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
-│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
-│                                                                              │
-│ Permission to use, copy, modify, and/or distribute this software for         │
-│ any purpose with or without fee is hereby granted, provided that the         │
-│ above copyright notice and this permission notice appear in all copies.      │
-│                                                                              │
-│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
-│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
-│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
-│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
-│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
-│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
-│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
-│ PERFORMANCE OF THIS SOFTWARE.                                                │
-╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/errno.h"
-#include "libc/nt/errors.h"
-#include "libc/sock/sock.h"
-
-/**
- * Translates Windows error using superset of consts.sh.
- */
-textwindows errno_t __dos2errno(uint32_t error) {
-  switch (error) {
-    case kNtErrorModNotFound:
-      return ENOSYS;
-    case kNtErrorBadCommand:
-      return EACCES;
-    case kNtErrorBadLength:
-      return EACCES;
-    case kNtErrorBadNetpath:
-      return ENOENT;
-    case kNtErrorBadNetName:
-      return ENOENT;
-    case kNtErrorBadNetResp:
-      return ENETDOWN;
-    case kNtErrorBadPathname:
-      return ENOENT;
-    case kNtErrorCannotMake:
-      return EACCES;
-    case kNtErrorCommitmentLimit:
-      return ENOMEM;
-    case kNtErrorConnectionAborted:
-      return ECONNABORTED;
-    case kNtErrorConnectionActive:
-      return EISCONN;
-    case kNtErrorConnectionRefused:
-      return ECONNREFUSED;
-    case kNtErrorCrc:
-      return EACCES;
-    case kNtErrorDirNotEmpty:
-      return ENOTEMPTY;
-    case kNtErrorDupName:
-      return EADDRINUSE;
-    case kNtErrorFilenameExcedRange:
-      return ENOENT;
-    case kNtErrorFileNotFound:
-      return ENOENT;
-    case kNtErrorGenFailure:
-      return EACCES;
-    case kNtErrorGracefulDisconnect:
-      return EPIPE;
-    case kNtErrorHostDown:
-      return EHOSTUNREACH;
-    case kNtErrorHostUnreachable:
-      return EHOSTUNREACH;
-    case kNtErrorInsufficientBuffer:
-      return EFAULT;
-    case kNtErrorInvalidAddress:
-      return EADDRNOTAVAIL;
-    case kNtErrorInvalidFunction:
-      return EINVAL;
-    case kNtErrorInvalidNetname:
-      return EADDRNOTAVAIL;
-    case kNtErrorInvalidUserBuffer:
-      return EMSGSIZE;
-    case kNtErrorIoPending:
-      return EINPROGRESS;
-    case kNtErrorLockViolation:
-      return EACCES;
-    case kNtErrorMoreData:
-      return EMSGSIZE;
-    case kNtErrorNetnameDeleted:
-      return ECONNABORTED;
-    case kNtErrorNetworkAccessDenied:
-      return EACCES;
-    case kNtErrorNetworkBusy:
-      return ENETDOWN;
-    case kNtErrorNetworkUnreachable:
-      return ENETUNREACH;
-    case kNtErrorNoaccess:
-      return EFAULT;
-    case kNtErrorNonpagedSystemResources:
-      return ENOMEM;
-    case kNtErrorNotEnoughMemory:
-      return ENOMEM;
-    case kNtErrorNotEnoughQuota:
-      return ENOMEM;
-    case kNtErrorNotFound:
-      return ENOENT;
-    case kNtErrorNotLocked:
-      return EACCES;
-    case kNtErrorNotReady:
-      return EACCES;
-    case kNtErrorNotSupported:
-      return ENOTSUP;
-    case kNtErrorNoMoreFiles:
-      return ENOENT;
-    case kNtErrorNoSystemResources:
-      return ENOMEM;
-    case kNtErrorOperationAborted:
-      return EINTR;
-    case kNtErrorOutOfPaper:
-      return EACCES;
-    case kNtErrorPagedSystemResources:
-      return ENOMEM;
-    case kNtErrorPagefileQuota:
-      return ENOMEM;
-    case kNtErrorPathNotFound:
-      return ENOENT;
-    case kNtErrorPipeNotConnected:
-      return EPIPE;
-    case kNtErrorPortUnreachable:
-      return ECONNRESET;
-    case kNtErrorProtocolUnreachable:
-      return ENETUNREACH;
-    case kNtErrorRemNotList:
-      return ECONNREFUSED;
-    case kNtErrorRequestAborted:
-      return EINTR;
-    case kNtErrorReqNotAccep:
-      return EWOULDBLOCK;
-    case kNtErrorSectorNotFound:
-      return EACCES;
-    case kNtErrorSemTimeout:
-      return ETIMEDOUT;
-    case kNtErrorSharingViolation:
-      return EACCES;
-    case kNtErrorTooManyNames:
-      return ENOMEM;
-    case kNtErrorUnexpNetErr:
-      return ECONNABORTED;
-    case kNtErrorWorkingSetQuota:
-      return ENOMEM;
-    case kNtErrorWriteProtect:
-      return EACCES;
-    case kNtErrorWrongDisk:
-      return EACCES;
-    case WSAEACCES:
-      return EACCES;
-    case WSAEDISCON:
-      return EPIPE;
-    case WSAEFAULT:
-      return EFAULT;
-    case WSAEINPROGRESS:
-      return EBUSY;
-    case WSAEINVAL:
-      return EINVAL;
-    case WSAEPROCLIM:
-      return ENOMEM;
-    case WSAESHUTDOWN:
-      return EPIPE;
-    case WSANOTINITIALISED:
-      return ENETDOWN;
-    case WSASYSNOTREADY:
-      return ENETDOWN;
-    case WSAVERNOTSUPPORTED:
-      return ENOSYS;
-    default:
-      return error;
-  }
-}