feat(process): public exec.spawn_redirected + exec.wait_any; os.cpu_count#332
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…ount (#331) expose the existing os-layer redirected spawn as a Child-returning exec wrapper (stdout/stderr fds, stdin inherited), add a POSIX wait(-1)-shaped exec.wait_any returning the reaped child's handle, and add os.cpu_count: linux popcounts the sched_getaffinity mask (honouring taskset/cgroup cpusets), darwin reads hw.ncpu via __sysctl, windows uses GetActiveProcessorCount(ALL_PROCESSOR_GROUPS). all three never report less than 1. groundwork for the parallel mach test runner (briar-systems/mach#1791). Claude-Session: https://claude.ai/code/session_011wvvqFRodZG3ZgLqerptnr
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This was referenced Jul 2, 2026
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Closes #331. Supports briar-systems/mach#1788 (parallel test runner child briar-systems/mach#1791).
exec.spawn_redirected(pathname, argv, envp, stdout_fd, stderr_fd)— Child-returning wrapper over the existingos.spawn_redirected(stdin inherited;-1inherits a stream).exec.wait_any(out_status)— blocking POSIXwait(-1); returns the reaped child's handle so callers juggling several children can map the exit to its work item. The windows os layer already implements pid -1 as a multi-wait across tracked child handles.os.cpu_count()— linux:sched_getaffinitypopcount (added SYS numbers 204/x86_64, 123/generic to all three tables); darwin:hw.ncpuvia__sysctl(202); windows:GetActiveProcessorCount(ALL_PROCESSOR_GROUPS). Clamped ≥ 1, forwarded through every OS/ISA dispatch module.Tests (new-convention labels):
std.process.exec.spawn_redirected:pipes_child_stdout,std.process.exec.wait_any:reaps_each_child_once,std.process.exec.wait_any:errs_with_no_children,std.system.os.cpu_count:at_least_one. Full suite: 571 passed, 0 failed on x86_64-linux.🤖 Generated with Claude Code
https://claude.ai/code/session_011wvvqFRodZG3ZgLqerptnr