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Justine Tunney
2020-06-15 07:18:57 -07:00
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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