feat(devfs): implement virtual device filesystem #78
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Add devfs support with virtual device nodes: - /dev/null: write discards data, read returns EOF - /dev/zero: read returns zeros, write discards data - /dev/console: write outputs to serial port - /dev/tty: write outputs to serial port Implementation: - New kernel/src/fs/devfs/ module with DeviceType enum - FdKind::Device variant for device file descriptors - FdKind::DevfsDirectory variant for /dev directory listing - sys_open routes /dev/* paths to devfs handler - sys_open handles /dev as a listable directory - sys_getdents64 returns virtual entries for /dev directory - sys_read/sys_write handle device operations - sys_fstat returns proper S_IFCHR/S_IFDIR mode and st_rdev - sys_access handles /dev and /dev/* paths - Poll support for device files Interactive features: - `ls /dev` works (directory listing) - `devtest` shell command for interactive device testing - Includes userspace test (devfs_test) verifying all behaviors Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
/dev/null,/dev/zero,/dev/console, and/dev/ttysupportDevice Behavior
Test plan
🤖 Generated with Claude Code