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Justine Tunney 072e1d2910 Make signal handling work well across platforms 
- Fix sigsuspend() on XNU
- Fix strsignal() on non-Linux
- Add unit tests for strsignal()
- Add unit tests for setitimer()
- Add unit tests for sigsuspend()
- Rewrite setitimer() for New Technology
- Rewrite nanosleep() for New Technology
- Polyfill SIGALRM on the New Technology
- select(0,0,0,0) on NT now calls pause()
- Remove some NTDLL calls that aren't needed
- Polyfill SA_NOCLDWAIT on the New Technology
- Polyfill SA_RESETHAND on the New Technology
- Polyfill sigprocmask() on the New Technology
- Polyfill SIGCHLD+SIG_IGN on the New Technology
- Polyfill SA_RESTART masking on the New Technology
- Deliver console signals from main thread on New Technology
- Document SA_RESTART behavior w/ @sarestartable / @norestart
- System call trace in MODE=dbg now prints inherited FDs and signal mask
2022-03-25 07:28:57 -07:00
..
calls Make signal handling work well across platforms 2022-03-25 07:28:57 -07:00
consts Make signal handling work well across platforms 2022-03-25 07:28:57 -07:00
errfuns Remove more nonstandard stuff from cosmopolitan.h 2021-03-01 00:18:23 -08:00
machcalls Productionize new APE loader and more 2021-10-02 08:27:03 -07:00
consts.sh Make signal handling work well across platforms 2022-03-25 07:28:57 -07:00
describeos.greg.c Introduce --strace flag for system call tracing 2022-03-18 18:07:28 -07:00
errfuns.h Add MODE=optlinux build mode (#141) 2021-10-14 19:36:49 -07:00
errfuns.sh Change license 2020-12-27 17:18:44 -08:00
g_syscount.S Clean old .source directive out of asm code 2022-03-18 12:43:21 -07:00
gen.sh Remove more nonstandard stuff from cosmopolitan.h 2021-03-01 00:18:23 -08:00
machcalls.sh Productionize new APE loader and more 2021-10-02 08:27:03 -07:00
macros.internal.h Make improvements 2020-12-01 03:43:40 -08:00
README.md Initial import 2020-06-15 07:18:57 -07:00
restorert.S Clean old .source directive out of asm code 2022-03-18 12:43:21 -07:00
strace.greg.c Introduce --strace flag for system call tracing 2022-03-18 18:07:28 -07:00
syscall.S Add MODE=optlinux build mode (#141) 2021-10-14 19:36:49 -07:00
syscalls.sh Make signal handling work well across platforms 2022-03-25 07:28:57 -07:00
systemfive.S Get Redbean fork() working on the New Technology 2022-03-20 08:01:14 -07:00
sysv.mk Introduce --strace flag for system call tracing 2022-03-18 18:07:28 -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