LinuxCore 0.3.6

LinuxCore

A thin, AOT-compatible .NET wrapper around Linux libc APIs. Provides ergonomic, low-allocation C# abstractions over raw syscalls for files, sockets, events, polling, scheduling, and more.

Features

• File I/O — LinuxFile for open/read/write/seek/fstat with Span<byte> support
• Memory Files — LinuxMemoryFile for memfd_create and memfd seals via fcntl
• Events & Semaphores — LinuxEvent and LinuxSemaphore backed by eventfd
• Polling — LinuxPoll for poll()-based readiness notification
• Clocks — LinuxClock for nanosecond-precision monotonic, boottime, CPU-time, and wall-clock (CLOCK_REALTIME) timestamps and high-precision sleeps
• Scheduling — LinuxScheduler for sched_setscheduler/sched_getscheduler (FIFO, RR, etc.)
• Resource Limits — LinuxResourceLimit for getrlimit/setrlimit
• Cancellation — LinuxCancellationToken bridges CancellationToken to native poll
• Sockets — UnixSocket for AF_UNIX sockets and LinuxSocketBase for shared raw socket operations
• System Configuration — SystemConfiguration for sysconf() queries (page size, max open files, etc.)
• Users & Groups — LinuxUser and LinuxGroup for passwd/group lookups by name or ID

Requirements

• Linux (the library is annotated with [SupportedOSPlatform("linux")])
• .NET 10+

Architecture

The library has two layers:

• LinuxCore.Interop — internal P/Invoke declarations using source-generated [LibraryImport]. Each file maps to a libc subsystem.
• LinuxCore — public API types wrapping the interop layer with safe-ish, idiomatic C# APIs.

File-descriptor-owning types follow this hierarchy:

NativeObject (IDisposable + Finalizer)
  └─ FileObject (FileDescriptor, shared I/O and descriptor-control helpers)
       ├─ LinuxEventBase → LinuxEvent, LinuxSemaphore
       ├─ LinuxSocketBase → UnixSocket
       └─ LinuxFile → LinuxMemoryFile

LinuxSecurityObject (Id + Name)
  ├─ LinuxUser
  └─ LinuxGroup

Operational notes

• LinuxScheduler.Set(...) and some LinuxResourceLimit.Set(...) calls may require root privileges or Linux capabilities such as CAP_SYS_NICE / CAP_SYS_RESOURCE.
• AF_UNIX pathname sockets are subject to the kernel sockaddr_un.sun_path limit (108 bytes on Linux).
• NativeAOT compatibility is exercised in CI on both glibc (Ubuntu) and musl (Alpine) runners via a small smoke app.

License

MIT