Description

Improve DragonFly BSD support by fixing existing ABI definitions, fix typo'd constant names, fix constant values, moving BSD constants that are not actually generic down into target modules, and adding missing DragonFly constants and libc declarations.

This also expands libc-test coverage for DragonFly and makes the tests handle older DragonFly headers with test-only version skips. The public libc API remains version-independent for DragonFly.

Sources

Primary API references are DragonFly BSD 6.4 release headers, using tag v6.4.0 (commit af5fb9a9e56f90cf51e48514d1874be61e9364e6). The same definitions and test behavior were cross-checked against DragonFly 6.2, 6.0, and 5.8 where older headers differ or omit newer symbols.

ABI/type definitions:

• pthread barrier types: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/_pthreadtypes.h
• segsz_t: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/types.h
• if_msghdr and interface flags: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/net/if.h
• ifaddrs.ifa_addrflags: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/include/ifaddrs.h
• kinfo_cputime: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/kinfo.h
• mcontext_t: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/cpu/x86_64/include/ucontext.h
• regex constants and regoff_t: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/lib/libc/tre-regex/regex.h

Constants and functions:

• file and posix_fadvise constants: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/fcntl.h
• sysctl constants: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/sysctl.h
• CPUCTL constants: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/cpuctl.h
• kqueue constants: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/event.h
• socket families: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/socket.h
• utmpx constants: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/include/utmpx.h
• extended attributes: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/extattr.h
• getrandom constants: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/random.h
• getnameinfo constants: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/include/netdb.h
• baud-rate constants: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/include/termios.h
• BPF timeout ioctls: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/net/bpf.h
• fdatasync and dup3: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/include/unistd.h
• dlvsym: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/include/dlfcn.h
• reallocarray and qsort_r: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/include/stdlib.h
• pthread affinity APIs: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/include/pthread_np.h
• ftok: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/af5fb9a9e56f90cf51e48514d1874be61e9364e6/sys/sys/ipc.h

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

Tested on DragonFly 5.8.3, 6.0.1, 6.2.2, 6.4.2 with self-built Rust/Cargo 1.95.0, Rust 1.95.0 on DragonFly 5.8.3 needs patches.

There is actually a KERN_MAXID, but the same constant is also present and non-deprecated on both nto and apple.

@rustbot label +stable-nominated