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Chris Babcock 2796afb0c2 Three days observation 10 months ago
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calls Fix build bug 10 months ago
consts Change license 10 months ago
errfuns Initial import 1 year ago
machcalls Fix build bug 10 months ago
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README.md Initial import 1 year ago
consensus.py Initial import 1 year ago
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errfuns.h Initial import 1 year ago
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systemfive.S Change license 10 months ago
sysv.mk Fix build bug 10 months ago
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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