db33973e0a
This is done without using Microsoft's internal APIs. MAP_PRIVATE mappings are copied to the subprocess via a pipe, since Microsoft doesn't want us to have proper COW pages. MAP_SHARED mappings are remapped without needing to do any copying. Global variables need copying along with the stack and the whole heap of anonymous mem. This actually improves the reliability of the redbean http server although one shouldn't expect 10k+ connections on a home computer that isn't running software built to serve like Linux or FreeBSD. |
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|---|---|---|
| .. | ||
| alg | ||
| bits | ||
| calls | ||
| conv | ||
| crt | ||
| crypto | ||
| dns | ||
| elf | ||
| fmt | ||
| integral | ||
| internal | ||
| intrin | ||
| isystem | ||
| linux | ||
| log | ||
| math | ||
| mem | ||
| nexgen32e | ||
| nt | ||
| ohmyplus | ||
| rand | ||
| runtime | ||
| sock | ||
| stdio | ||
| str | ||
| stubs | ||
| sysv | ||
| testlib | ||
| time | ||
| tinymath | ||
| unicode | ||
| x | ||
| zipos | ||
| README.md | ||
| assert.h | ||
| complex.h | ||
| dce.h | ||
| disclaimer.inc | ||
| dos.h | ||
| errno.h | ||
| inttypes.h | ||
| libc.mk | ||
| limits.h | ||
| literal.h | ||
| mach.h | ||
| macho.h | ||
| macros-cpp.inc | ||
| macros.h | ||
| macros.inc | ||
| math.h | ||
| notice.inc | ||
| paths.h | ||
| pe.h | ||
| typename.h | ||
| tzfile.h | ||
| wave.h | ||
| zip.h | ||
README.md
SYNOPSIS
Cosmopolitan Standard Library.
OVERVIEW
This directory defines static archives defining functions, like
printf(), mmap(), win32, etc. Please note that the Cosmopolitan
build configuration doesn't link any C/C++ library dependencies
by default, so you still have the flexibility to choose the one
provided by your system. If you'd prefer Cosmopolitan, just add
(LIBC) and (CRT) to your linker arguments.
Your library is compromised of many bite-sized static archives. We use the checkdeps tool to guarantee that the contents of the archives are organized in a logical way that's easy to use with or without our makefile infrastructure, since there's no cyclic dependencies.
The Cosmopolitan Library exports only the most stable canonical system calls for all supported operating systems, regardless of which platform is used for compilation. We polyfill many of the APIs, e.g. read(), write() so they work consistently everywhere while other apis, e.g. CreateWindowEx(), might only work on one platform, in which case they become no-op functions on others.
Cosmopolitan polyfill wrappers will usually use the dollar sign naming convention, so they may be bypassed when necessary. This same convention is used when multiple implementations of string library and other performance-critical function are provided to allow Cosmopolitan to go fast on both old and newer computers.
We take an approach to configuration that relies heavily on the compiler's dead code elimination pass (libc/dce.h). Most of the code is written so that, for example, folks not wanting support for OpenBSD can flip a bit in SUPPORT_VECTOR and that code will be omitted from the build. The same is true for builds that are tuned using -march=native which effectively asks the library to not include runtime support hooks for x86 processors older than what you use.
Please note that, unlike Cygwin or MinGW, Cosmopolitan does not achieve broad support by bolting on a POSIX emulation layer. We do nothing more than (in most cases) stateless API translations that get you 90% of the way there in a fast lightweight manner. We therefore can't address some of the subtle differences, such as the nuances of absolute paths on Windows. Our approach could be compared to something more along the lines of, "the Russians just used a pencil to write in space", versus spending millions researching a pen like NASA.