Add support for several mostly x86_64-only syscalls

[kov]

Common Filesystem Operations (9 x86_64-only syscalls)

• access: Check file access permissions
• chmod: Change file mode
• creat: Create file (legacy)
• mkdir: Create directory
• readlink: Read symbolic link
• stat: Get file status
• lstat: Get file status (no symlink follow)
• utimes: Change file timestamps
• futimesat: Change file timestamps with dirfd

Process Creation (2 x86_64-only syscalls)

• fork: Create child process
• vfork: Create child process (lightweight)

I/O & IPC Misc (3 syscalls)

• getdents (x86_64): Legacy directory entries
• semtimedop (common): Semaphore ops with timeout
• sendfile (x86_64): Copy data between fds

Added kernel types:

• LinuxDirent: Legacy directory entry structure
• Sembuf: Semaphore operation structure

Total: 14 new syscalls, 5 new tests (2 run on aarch64) All 549 tests passing.

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[Copilot]

Pull request overview

This PR adds support for 14 new syscalls to the pinchy tracing tool, primarily focused on x86_64-only legacy syscalls. The changes include 9 filesystem operations (access, chmod, creat, mkdir, readlink, stat, lstat, utimes, futimesat), 2 process creation syscalls (fork, vfork), and 3 I/O/IPC miscellaneous syscalls (getdents, semtimedop, sendfile). The PR introduces two new kernel types (LinuxDirent for legacy directory entries and Sembuf for semaphore operations) and includes comprehensive tests for the new functionality.

Key Changes

• Added 14 new syscall data structures in pinchy-common with proper architecture annotations
• Implemented eBPF handlers for capturing syscall data in the kernel space
• Added event parsing logic to format and display the captured syscall data
• Extended return value formatting to handle the new syscalls appropriately

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
pinchy-common/src/lib.rs	Added data structures for 14 new syscalls including ForkData, VforkData, AccessData, StatData, GetdentsData, SemtimedopData, and SendfileData
pinchy-common/src/kernel_types.rs	Added LinuxDirent and Sembuf kernel type definitions for legacy directory entries and semaphore operations
pinchy-ebpf/src/main.rs	Registered fork and vfork as trivial syscalls in the consolidated handler
pinchy-ebpf/src/filesystem.rs	Implemented eBPF handlers for 10 filesystem-related syscalls including getdents, access, chmod, creat, mkdir, readlink, stat, lstat, utimes, and futimesat
pinchy-ebpf/src/basic_io.rs	Added sendfile syscall handler with offset pointer handling
pinchy-ebpf/src/ipc.rs	Implemented semtimedop handler with sembuf array and timeout handling
pinchy/src/events.rs	Added event parsing logic for all 14 new syscalls with appropriate formatting
pinchy/src/format_helpers.rs	Extended return value formatting to handle fork/vfork, readlink, getdents, semtimedop, and filesystem operation return values; added duplicates in match arm
pinchy/src/server.rs	Registered all new syscalls with their respective consolidated handlers (trivial, filesystem, basic_io, ipc)
pinchy/src/tests/process.rs	Added 6 test cases for fork and vfork syscalls covering parent, child, and error scenarios
pinchy/src/tests/ipc.rs	Added 2 test cases for semtimedop with and without timeout
pinchy/src/tests/filesystem.rs	Added 17 test cases covering all new filesystem syscalls with various scenarios
pinchy/src/tests/basic_io.rs	Added 2 test cases for sendfile with and without offset pointer