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cosmopolitan/libc/sysv
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Justine Tunney 7b26b42769 Pay off more technical debt 
This makes breaking changes to add underscores to many non-standard
function names provided by the c library. MODE=tiny is now tinier and
we now use smaller locks that are better for tiny apps in this mode.
Some headers have been renamed to be in the same folder as the build
package, so it'll be easier to know which build dependency is needed.
Certain old misguided interfaces have been removed. Intel intrinsics
headers are now listed in libc/isystem (but not in the amalgamation)
to help further improve open source compatibility. Header complexity
has also been reduced. Lastly, more shell scripts are now available.

Compared to 6f7d0cb1c3, some tiny corrections were made in libc/intrin/g_fds.c and libc/zipos/open.c including double semi colons and incorrect indentation for existing vista changes that were manually pulled from this commit previously.
2023-03-20 21:07:01 -04:00
..
calls Backport main branch improvements (#658) 2022-10-10 20:44:29 -07:00
consts Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
errfuns Make improvements 2022-05-28 00:28:09 -07:00
consts.sh Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -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 Tidy up the threading implementation 2022-09-10 02:56:25 -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 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 Backport main branch improvements (#658) 2022-10-10 20:44:29 -07:00
syscount.S Make some systemic improvements 2022-05-18 16:52:36 -07:00
systemfive.S Pay off more technical debt 2023-03-20 21:07:01 -04:00
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