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We always favor calling functions like openat(), fstatat(), etc. because Linux, XNU, FreeBSD, and OpenBSD all elected to support them, while some systems like Android love them so much, that they stopped supporting the old interfaces. This change ensures that when dirfd is actually a dirfd and not AT_FDCWD we'll do the right thing on Windows NT. We use an API that's been around since Vista to accomplish that. This change also adds exponential backoff to chdir() on Windows since it seems almost as flaky on Windows 7 as the rmdir() function. |
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| .. | ||
| calls | ||
| consts | ||
| errfuns | ||
| machcalls | ||
| consensus.py | ||
| consts.sh | ||
| errfuns.h | ||
| errfuns.sh | ||
| g_syscount.S | ||
| gen.sh | ||
| machcalls.sh | ||
| macros.internal.h | ||
| nr.py | ||
| README.md | ||
| restorert.S | ||
| syscall.S | ||
| syscalls.sh | ||
| systemfive.S | ||
| sysv.mk | ||
| versions.txt | ||
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