cosmopolitan/libc
Justine Tunney c91b3c5006 Initial import 2020-06-15 07:18:57 -07:00
..
alg Initial import 2020-06-15 07:18:57 -07:00
bits Initial import 2020-06-15 07:18:57 -07:00
calls Initial import 2020-06-15 07:18:57 -07:00
conv Initial import 2020-06-15 07:18:57 -07:00
crt Initial import 2020-06-15 07:18:57 -07:00
crypto Initial import 2020-06-15 07:18:57 -07:00
dns Initial import 2020-06-15 07:18:57 -07:00
elf Initial import 2020-06-15 07:18:57 -07:00
escape Initial import 2020-06-15 07:18:57 -07:00
fmt Initial import 2020-06-15 07:18:57 -07:00
integral Initial import 2020-06-15 07:18:57 -07:00
internal Initial import 2020-06-15 07:18:57 -07:00
intrin Initial import 2020-06-15 07:18:57 -07:00
isystem Initial import 2020-06-15 07:18:57 -07:00
log Initial import 2020-06-15 07:18:57 -07:00
math Initial import 2020-06-15 07:18:57 -07:00
mem Initial import 2020-06-15 07:18:57 -07:00
nexgen32e Initial import 2020-06-15 07:18:57 -07:00
nt Initial import 2020-06-15 07:18:57 -07:00
rand Initial import 2020-06-15 07:18:57 -07:00
runtime Initial import 2020-06-15 07:18:57 -07:00
sock Initial import 2020-06-15 07:18:57 -07:00
stdio Initial import 2020-06-15 07:18:57 -07:00
str Initial import 2020-06-15 07:18:57 -07:00
stubs Initial import 2020-06-15 07:18:57 -07:00
sysv Initial import 2020-06-15 07:18:57 -07:00
testlib Initial import 2020-06-15 07:18:57 -07:00
time Initial import 2020-06-15 07:18:57 -07:00
tinymath Initial import 2020-06-15 07:18:57 -07:00
unicode Initial import 2020-06-15 07:18:57 -07:00
x Initial import 2020-06-15 07:18:57 -07:00
zipos Initial import 2020-06-15 07:18:57 -07:00
README.md Initial import 2020-06-15 07:18:57 -07:00
assert.h Initial import 2020-06-15 07:18:57 -07:00
complex.h Initial import 2020-06-15 07:18:57 -07:00
dce.h Initial import 2020-06-15 07:18:57 -07:00
disclaimer.inc Initial import 2020-06-15 07:18:57 -07:00
dos.h Initial import 2020-06-15 07:18:57 -07:00
errno.h Initial import 2020-06-15 07:18:57 -07:00
inttypes.h Initial import 2020-06-15 07:18:57 -07:00
leb128.h Initial import 2020-06-15 07:18:57 -07:00
libc.mk Initial import 2020-06-15 07:18:57 -07:00
limits.h Initial import 2020-06-15 07:18:57 -07:00
literal.h Initial import 2020-06-15 07:18:57 -07:00
mach.h Initial import 2020-06-15 07:18:57 -07:00
macho.h Initial import 2020-06-15 07:18:57 -07:00
macros-cpp.inc Initial import 2020-06-15 07:18:57 -07:00
macros.h Initial import 2020-06-15 07:18:57 -07:00
macros.inc Initial import 2020-06-15 07:18:57 -07:00
math.h Initial import 2020-06-15 07:18:57 -07:00
ncabi.h Initial import 2020-06-15 07:18:57 -07:00
notice.inc Initial import 2020-06-15 07:18:57 -07:00
paths.h Initial import 2020-06-15 07:18:57 -07:00
pe.h Initial import 2020-06-15 07:18:57 -07:00
typename.h Initial import 2020-06-15 07:18:57 -07:00
tzfile.h Initial import 2020-06-15 07:18:57 -07:00
wave.h Initial import 2020-06-15 07:18:57 -07:00
zip.h Initial import 2020-06-15 07:18:57 -07:00

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.

One cost worth noting, concerning stateless API translation, is file descriptors needed to change from int to int64_t, thus requiring a certain degree of added care when porting software.