gbos.git/c/spin.c, branch master gbos - a tiny Unix-flavored OS for the Game Boy Color (kernel, shell, coreutils in C, RAM filesystem) https://git.sl0p.foo/gbos.git/atom/c/spin.c?h=master 2026-07-17T22:38:38Z refactor: c/ -> usr/, compiled program blobs out of the source tree 2026-07-17T22:38:38Z user user@clank 2026-07-17T22:38:38Z urn:sha1:ba2d7ae1d7b319645b10aaa31a7f664f9f80c25c Userland sources live in usr/ (fits the Unix theme better than 'c'). SDCC output .bin blobs land in build/usr/ with the other build artifacts instead of littering the source dir; programs.asm INCBINs them from there. Byte-identical ROM. jobs: background execution (&), non-blocking reap, spin demo 2026-07-16T09:15:12Z user user@clank 2026-07-16T09:15:12Z urn:sha1:bb4f468b73c8a888bec1e5b2ba7f1575ab7f8456 - sys_reap: nohang reap of a finished zombie child (-> pid or 0). - shell: 'cmd &' launches in the background (prints [pid], no wait); reaps finished jobs at the prompt ([pid done]). Foreground now waits for its own child specifically (loops wait(), reporting bg completions meanwhile) so kill reports the right pid. - spin: a process that yields forever - a target for ps/kill. - verified: spin &; ps shows it; kill <pid> removes just that one; immortal init; self-finishing bg worker reaped with [pid done].