sys_write passes u64::MAX as offset for non-positioned file descriptors.
ContextHandle::Start used an inline 'offset != 0' check which rejected
u64::MAX, causing EINVAL when bootstrap called start_fd.write(&[0]) during
fork_inner(). Replaced with require_zero_offset() which accepts both 0 and
u64::MAX (fixed in the previous commit for the same class of bug).
sys_write passes u64::MAX as the offset sentinel for non-positioned file
descriptors. The proc scheme's require_zero_offset rejected this value,
causing bootstrap's tcb_activate to crash with EINVAL when writing
EnvRegisters (fsbase) back to the regs/env handle.
This was the root cause of the 'Invalid opcode fault' during bootstrap
(PID 0) that prevented redbear-mini from reaching a login prompt.
Extended /proc/self resolution to handle sub-paths like
/proc/self/fd/0, /proc/self/stat, /proc/self/status, etc.
Previously only /proc/self (the directory itself) was resolved.
Now /proc/self/fd, /proc/self/stat, /proc/self/maps, and all
other sub-paths are resolved by replacing 'self' with the
current PID and delegating to the standard proc_open() parser.
Cross-referenced with Linux 7.1 fs/proc/self.c proc_self_get_link()
which creates a symlink to the current PID directory. This
completes the /proc/self implementation for all sub-entries.
Added /proc/self resolution in open_inner(). When /proc/self
is opened, it resolves to /proc/<current-pid> by reading
context::current().pid and returning a ProcDir handle.
Cross-referenced with Linux 7.1 fs/proc/self.c proc_self_get_link()
which creates a symlink inode pointing to the current PID.
This enables 'ls /proc/self', 'cat /proc/self/status', and all
other tools that use /proc/self to access their own process info.
Added ProcFilesystems ContextHandle that lists supported filesystems
in Linux /proc/filesystems format. Lists sysfs, proc, devtmpfs,
and redoxfs as supported types.
Cross-referenced with Linux 7.1 fs/filesystems.c filesystems_proc_show().
'nodev' prefix indicates filesystems not requiring a block device.
Also added to ProcRoot directory listing.
Added ProcVersion ContextHandle that outputs the kernel version
string using CARGO_PKG_VERSION, TARGET, and COOKBOOK_SOURCE_IDENT
environment variables from the build system.
Cross-referenced with Linux 7.1 fs/proc/version.c version_proc_show().
Format: 'Red Bear OS version X.Y.Z (arch) source_ident'
Also added to ProcRoot directory listing.
Added ProcLoadavg ContextHandle that counts runnable contexts
using context::contexts() iterator and Status::is_runnable().
Outputs Linux /proc/loadavg format:
0.00 0.00 0.00 nr_runnable/total 0
Cross-referenced with Linux 7.1 fs/proc/loadavg.c loadavg_proc_show().
Load averages are 0.00 (Red Bear does not track 1/5/15-min EMA).
Last PID is 0 (no PID tracking yet).
Also added to ProcRoot directory listing.
Added ProcUptime ContextHandle that reads monotonic() time
from the kernel and outputs it as uptime_seconds idle_seconds
in Linux /proc/uptime format (two floats with newline).
Cross-referenced with Linux 7.1 fs/proc/uptime.c uptime_proc_show().
Idle time is 0.0 since Red Bear does not track per-CPU idle time.
Also added to ProcRoot directory listing.
Added ProcMeminfo ContextHandle that reads total_frames/free_frames
from the kernel memory subsystem and outputs them in Linux
/proc/meminfo format (MemTotal, MemFree, MemAvailable, Buffers,
Cached, SwapTotal, etc. all in kB).
Cross-referenced with Linux 7.1 fs/proc/meminfo.c meminfo_proc_show().
Also added to ProcRoot directory listing alongside cpuinfo.
Added ProcCpuinfo ContextHandle that calls the arch-specific
cpu_info() function to output processor information (model,
features, cache, topology). Appears as a regular file in
/proc/cpuinfo and is listed in the ProcRoot directory.
Cross-referenced with Linux 7.1 arch/x86/kernel/cpu/proc.c
show_cpuinfo() which formats /proc/cpuinfo from cpu_data.
Added ProcFdDir ContextHandle that lists open file descriptors
as symlink directory entries. Reads from posix_fdtbl and outputs
fd numbers (0, 1, 2, ...) as directory entries.
Cross-referenced with Linux 7.1 fs/proc/fd.c proc_fd_link()
and tid_fd_revalidate(). Listed fds are open (non-None) entries
from the process's POSIX file descriptor table.
Each entry appears as /proc/[pid]/fd/[n] for use by tools
like ls, lsof, and ps.
Added 7 I/O accounting fields to Context (rchar, wchar, syscr, syscw,
read_bytes, write_bytes, cancelled_write_bytes) and new ProcIo
ContextHandle that outputs them in Linux key=value format:
rchar: 0
wchar: 0
syscr: 0
syscw: 0
read_bytes: 0
write_bytes: 0
cancelled_write_bytes: 0
Cross-referenced with Linux 7.1 fs/proc/base.c do_task_io_accounting().
All values start at 0 and will be incremented as the syscall
interface is extended to track I/O operations.
Added rlimits: [u64; 16] to Context (initialized to RLIM_INFINITY)
and new ProcLimits ContextHandle that outputs in Linux format:
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
...
Cross-referenced with Linux 7.1 fs/proc/array.c proc_pid_limits().
All 16 RLIMIT_* resource limits are listed with their units.
New ProcStatm ContextHandle that reports the 7-field memory summary
matching Linux /proc/[pid]/statm format:
size resident shared text lib data dt
All values in pages. Cross-referenced with Linux 7.1
fs/proc/array.c:proc_pid_statm().
Resident count is approximated as the total physical grants
(GRANT_PHYS), since Red Bear has no paging/swapping and all
memory is resident. Other fields (shared, lib, dt) are 0 since
Red Bear's memory model doesn't distinguish these.
New ProcMaps ContextHandle that iterates over addr_space.grants
and formats each grant in Linux /proc/[pid]/maps format:
address_start-address_end perms 00000000 00:00 0 path
Where perms is rwxp based on GrantFlags (GRANT_READ/WRITE/EXEC),
and path is [file]/[vdso]/[heap] based on whether the grant is
file-backed and its address range.
Cross-referenced with Linux 7.1 fs/proc/task_mmu.c proc_pid_maps_op
and show_vma_header_prefix/show_map_vma().
- Rebase all Red Bear kernel changes onto upstream master (4d5d36d4).
- Update version to 0.5.12+rb0.3.0 and add Red Bear author attribution.
- Switch redox_syscall direct dependency to local fork path (../syscall).
- Bump rust-toolchain.toml to nightly-2026-05-24.
- Regenerate Cargo.lock for +rb0.3.0 suffixes and path deps.
* `syscall::sendfd`, now, when called with a `ContextHandle::FileTable` adds the fd to the filetable removing it from the calling process's filetable
* Files can now be added to, removed from another process, and can be duplicated using `ProcScheme::kcall`
* Files of another process with the flag O_CLOEXEC can now be closed by using `kcall`
vasilito
Ibuki Omatsu