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cosmopolitan/libc/sysv
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Justine Tunney c5c4dfcd21 Improve quality of raise(), abort(), and tkill() 
This change fixes a nasty bug where SIG_IGN and SIG_DFL weren't working
as advertised on BSDs. This change also fixes the tkill() definition on
MacOS so it maps to __pthread_kill().
2022-09-03 20:17:54 -07:00
..
calls Improve quality of raise(), abort(), and tkill() 2022-09-03 20:17:54 -07:00
consts Run fix-third-party.py and man2txt on sed 2022-08-21 22:26:48 -07:00
errfuns Make improvements 2022-05-28 00:28:09 -07:00
consts.sh Improve quality of raise(), abort(), and tkill() 2022-09-03 20:17:54 -07:00
describeos.greg.c Remove malloc() dependency on pledge() / unveil() 2022-07-24 21:51:37 -07:00
errfun.S Make improvements 2022-05-28 00:28:09 -07:00
errfuns.h Reduce build graph by another eight percent 2022-08-13 13:11:56 -07:00
errfuns.sh Change license 2020-12-27 17:18:44 -08:00
errno.c Fix stdio regression 2022-05-19 00:51:15 -07:00
errno_location.greg.c Simplify TLS and reduce startup latency 2022-07-18 04:10:54 -07:00
gen.sh Reduce build graph by another 14 percent 2022-08-17 20:01:21 -07:00
macros.internal.h Reduce build graph by another 14 percent 2022-08-17 20:01:21 -07:00
README.md Initial import 2020-06-15 07:18:57 -07:00
restorert.S Improve pledge() usability and consistency 2022-08-07 16:18:33 -07:00
strace.greg.c Make some systemic improvements 2022-05-18 16:52:36 -07:00
syscall.S Add MODE=optlinux build mode (#141) 2021-10-14 19:36:49 -07:00
syscalls.sh Improve quality of raise(), abort(), and tkill() 2022-09-03 20:17:54 -07:00
syscount.S Make some systemic improvements 2022-05-18 16:52:36 -07:00
systemfive.S Show crash reports on SIGSYS 2022-06-23 13:01:01 -07:00
sysv.mk Reduce build graph by another 14 percent 2022-08-17 20:01:21 -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