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cosmopolitan/libc/sysv
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Justine Tunney acd8900071
Add fexecve() and map O_EXEC to O_PATH on Linux
2022-10-02 09:15:46 -07:00
..
calls Add fexecve() and map O_EXEC to O_PATH on Linux 2022-10-02 09:15:46 -07:00
consts Add fexecve() and map O_EXEC to O_PATH on Linux 2022-10-02 09:15:46 -07:00
dos2errno Change support vector to Windows 8+ 2022-09-15 03:55:05 -07:00
errfuns Make improvements 2022-05-28 00:28:09 -07:00
consts.sh Add fexecve() and map O_EXEC to O_PATH on Linux 2022-10-02 09:15:46 -07:00
describeos.greg.c Remove malloc() dependency on pledge() / unveil() 2022-07-24 21:51:37 -07:00
dos2errno.sh Change support vector to Windows 8+ 2022-09-15 03:55:05 -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 Tidy up the threading implementation 2022-09-10 02:56:25 -07:00
gen.sh Make dos errno multimapping linkage tinier 2022-09-13 06:25:50 -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 Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
syscall.S Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
syscalls.sh Add fexecve() and map O_EXEC to O_PATH on Linux 2022-10-02 09:15:46 -07:00
syscount.S Make some systemic improvements 2022-05-18 16:52:36 -07:00
systemfive.S Pay off more technical debt 2022-09-12 23:36:56 -07:00
sysv.mk Make dos errno multimapping linkage tinier 2022-09-13 06:25:50 -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