Initial import

libc/sysv/README.md

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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