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cosmopolitan/libc/sysv
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Justine Tunney 1ff9ab95ac Make C memory safe like Rust 
This change enables Address Sanitizer systemically w/ `make MODE=dbg`.
Our version of Rust's `unsafe` keyword is named `noasan` which is used
for two functions that do aligned memory chunking, like `strcpy.c` and
we need to fix the tiny DEFLATE code, but that's it everything else is
fabulous you can have all the fischer price security blankets you need

Best of all is we're now able to use the ASAN data in Blinkenlights to
colorize the memory dumps. See the screenshot below of a test program:

  https://justine.lol/blinkenlights/asan.png

Which is operating on float arrays stored on the stack, with red areas
indicating poisoned memory, and the green areas indicate valid memory.
2021-02-01 03:58:46 -08:00
..
calls Support dirfd relative iops on Windows 2021-01-30 01:49:43 -08:00
consts Add exponential backoff to rmdir() on Windows 2021-01-29 21:48:40 -08:00
errfuns Initial import 2020-06-15 07:18:57 -07:00
machcalls Fix build bug 2020-12-19 13:37:31 -08:00
consensus.py Fix XNU / FreeBSD / OpenBSD / RHEL5 / NT bugs 2021-01-25 18:31:17 -08:00
consts.sh Make C memory safe like Rust 2021-02-01 03:58:46 -08:00
errfuns.h Initial import 2020-06-15 07:18:57 -07:00
errfuns.sh Change license 2020-12-27 17:18:44 -08:00
g_syscount.S Change license 2020-12-27 17:18:44 -08:00
gen.sh Change license 2020-12-27 17:18:44 -08:00
machcalls.sh Change license 2020-12-27 17:18:44 -08:00
macros.internal.h Make improvements 2020-12-01 03:43:40 -08:00
nr.py Fix XNU / FreeBSD / OpenBSD / RHEL5 / NT bugs 2021-01-25 18:31:17 -08:00
README.md Initial import 2020-06-15 07:18:57 -07:00
restorert.S Change license 2020-12-27 17:18:44 -08:00
syscall.S Change license 2020-12-27 17:18:44 -08:00
syscalls.sh Support dirfd relative iops on Windows 2021-01-30 01:49:43 -08:00
systemfive.S Make C memory safe like Rust 2021-02-01 03:58:46 -08:00
sysv.mk Fix link order in cosmopolitan.a 2021-01-16 12:05:41 -08:00
versions.txt Initial import 2020-06-15 07:18:57 -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