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cosmopolitan/libc/sysv
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Justine Tunney 046c7ebd4a Improve locks and signals 
- Introduce fast spinlock API
- Double rand64() perf w/ spinlock
- Improve raise() on New Technology
- Support gettid() across platforms
- Implement SA_NODEFER on New Technology
- Move the lock intrinsics into LIBC_INTRIN
- Make SIGTRAP recoverable on New Technology
- Block SIGCHLD in wait4() on New Technology
- Add threading prototypes for XNU and FreeBSD
- Rewrite abort() fixing its minor bugs on XNU/NT
- Shave down a lot of the content in libc/bits/bits.h
- Let signal handlers modify CPU registers on New Technology
2022-04-12 05:20:17 -07:00
..
calls Improve locks and signals 2022-04-12 05:20:17 -07:00
consts Delete some junk constants 2022-04-11 23:49:53 -07:00
errfuns Remove more nonstandard stuff from cosmopolitan.h 2021-03-01 00:18:23 -08:00
machcalls Productionize new APE loader and more 2021-10-02 08:27:03 -07:00
consts.sh Delete some junk constants 2022-04-11 23:49:53 -07:00
describeos.greg.c Introduce --strace flag for system call tracing 2022-03-18 18:07:28 -07:00
errfuns.h Add MODE=optlinux build mode (#141) 2021-10-14 19:36:49 -07:00
errfuns.sh Change license 2020-12-27 17:18:44 -08:00
g_syscount.S Clean old .source directive out of asm code 2022-03-18 12:43:21 -07:00
gen.sh Remove more nonstandard stuff from cosmopolitan.h 2021-03-01 00:18:23 -08:00
machcalls.sh Productionize new APE loader and more 2021-10-02 08:27:03 -07:00
macros.internal.h Make improvements 2020-12-01 03:43:40 -08:00
README.md Initial import 2020-06-15 07:18:57 -07:00
restorert.S Clean old .source directive out of asm code 2022-03-18 12:43:21 -07:00
strace.greg.c Introduce --strace flag for system call tracing 2022-03-18 18:07:28 -07:00
syscall.S Add MODE=optlinux build mode (#141) 2021-10-14 19:36:49 -07:00
syscalls.sh Improve locks and signals 2022-04-12 05:20:17 -07:00
systemfive.S Get Redbean fork() working on the New Technology 2022-03-20 08:01:14 -07:00
sysv.mk Introduce --strace flag for system call tracing 2022-03-18 18:07:28 -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