foundry

Stage 14: processes (0.14.0)

fork with copy-on-write (refcounted frames, CoW page faults, CR0.WP),
vfork and fork-style clone; execve with Linux's argv/envp/auxv stack
(AT_PHDR, AT_PAGESZ, AT_ENTRY, AT_RANDOM from virtio-rng, AT_EXECFN...);
mmap/munmap/mprotect/brk with VMAs and demand paging (anonymous private
and shared, file-backed private); signals: rt_sigaction, rt_sigprocmask,
rt_sigreturn with Linux rt_sigframes, kill, pause, default actions incl.
stop/continue, SIGSEGV on bad accesses, SIGCHLD, SIGPIPE, EINTR and
SA_RESTART; wait4 with Linux status encoding; getppid, exit_group, dup,
dup2, dup3, pipe2, fcntl, O_CLOEXEC; process groups and a tty foreground
group (Ctrl+C -> SIGINT, Ctrl+Z -> SIGTSTP). Syscalls now return via
iretq through a common TrapFrame.

The shell uses fork + exec with job control: Ctrl+C, kill, fg, bg.
New user programs forktest, cowtest, mmaptest, sigtest and
tests/process.rs (11 tests). README: learner chapter on fork/exec,
copy-on-write, memory maps and signals; roadmap updated. New boot.png.

1 file changed, 11 insertions, 0 deletions

@@ -89,6 +89,17 @@ random -d 6 5 getty -1 /dev/hvc0 tile tile -r+# Stage 14: processes. Every program above was started with fork + execve;+# these check the process model itself (each prints "all checks passed").+# Then a background job ended with the kill builtin (SIGTERM: 128+15).+forktest+cowtest+mmaptest+sigtest+start spin 1000+kill %1+wait+kill -l nosuchprogram cd Q: cd A:/tmp