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cosmopolitan/libc/sysv
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Justine Tunney e557058ac8
Improve cosmo's conformance to libc-test 
This change addresses various open source compatibility issues, so that
we pass 313/411 of the tests in https://github.com/jart/libc-test where
earlier today we were passing about 30/411 of them, due to header toil.
Please note that Glibc only passes 341/411 so 313 today is pretty good!

- Make the conformance of libc/isystem/ headers nearly perfect
- Import more of the remaining math library routines from Musl
- Fix inconsistencies with type signatures of calls like umask
- Write tests for getpriority/setpriority which work great now
- conform to `struct sockaddr *` on remaining socket functions
- Import a bunch of uninteresting stdlib functions e.g. rand48
- Introduce readdir_r, scandir, pthread_kill, sigsetjmp, etc..

Follow the instructions in our `tool/scripts/cosmocc` toolchain to run
these tests yourself. You use `make CC=cosmocc` on the test repository
2022-10-10 17:52:41 -07:00
..
calls Introduce sigtimedwait() and sigwaitinfo() 2022-10-10 07:39:44 -07:00
consts Improve cosmo's conformance to libc-test 2022-10-10 17:52:41 -07:00
dos2errno Improve docs of more system calls 2022-10-02 22:14:33 -07:00
errfuns Make improvements 2022-05-28 00:28:09 -07:00
consts.sh Improve cosmo's conformance to libc-test 2022-10-10 17:52:41 -07:00
describeos.greg.c Remove malloc() dependency on pledge() / unveil() 2022-07-24 21:51:37 -07:00
dos2errno.sh Improve docs of more system calls 2022-10-02 22:14:33 -07:00
errfun.S Make improvements 2022-05-28 00:28:09 -07:00
errfuns.h Reduce build graph by another eight percent 2022-08-13 13:11:56 -07:00
errfuns.sh Change license 2020-12-27 17:18:44 -08:00
errno.c Fix stdio regression 2022-05-19 00:51:15 -07:00
errno_location.greg.c Tidy up the threading implementation 2022-09-10 02:56:25 -07:00
gen.sh Make dos errno multimapping linkage tinier 2022-09-13 06:25:50 -07:00
macros.internal.h Reduce build graph by another 14 percent 2022-08-17 20:01:21 -07:00
README.md Initial import 2020-06-15 07:18:57 -07:00
restorert.S Improve pledge() usability and consistency 2022-08-07 16:18:33 -07:00
strace.greg.c Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
syscall.S Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
syscalls.sh Introduce sigtimedwait() and sigwaitinfo() 2022-10-10 07:39:44 -07:00
syscount.S Make some systemic improvements 2022-05-18 16:52:36 -07:00
systemfive.S Pay off more technical debt 2022-09-12 23:36:56 -07:00
sysv.mk Make dos errno multimapping linkage tinier 2022-09-13 06:25:50 -07:00

README.md

SYNOPSIS

System Five Import Libraries

OVERVIEW

Bell System Five is the umbrella term we use to describe Linux, FreeBSD, OpenBSD, and Mac OS X which all have nearly-identical application binary interfaces that stood the test of time, having definitions nearly the same as those of AT&T back in the 1980's.

Cosmopolitan aims to help you build apps that can endure over the course of decades, just like these systems have: without needing to lift a finger for maintenance churn, broken builds, broken hearts.

The challenge to System V binary compatibility basically boils down to numbers. All these systems agree on what services are provided, but tend to grant them wildly different numbers.

We address this by putting all the numbers in a couple big shell scripts, ask the GNU Assembler to encode them into binaries using an efficient LEB128 encoding, unpacked by _init(), and ref'd via extern const. It gives us good debuggability, and any costs are gained back by fewer branches in wrapper functions.z