Add epoll headers and syscall stubs#27206
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Adds the epoll syscall surface without a working implementation, so the boilerplate can land ahead of the host integration: - sys/epoll.h synced from upstream musl, no longer excluded by update_musl.py - musl epoll.c wrappers compiled into libc (epoll_create/epoll_create1/ epoll_ctl/epoll_wait/epoll_pwait) - SYS_epoll_* -> __syscall_epoll_* mappings, declarations and signatures - legacy (non-WASMFS) JS syscalls return -ENOSYS - WASMFS syscalls return -ENOSYS, matching the existing socket stubs The actual readiness/wait-queue host integration follows in a separate commit.
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This adds the epoll syscall surface (headers, libc wrappers, declarations and signatures) with no working implementation, so the boilerplate can land ahead of the host integration. Split out from #27201 so that the larger, more involved host implementation can be reviewed separately.
The syscalls are fully wired in but return
-ENOSYSeverywhere for now:sys/epoll.hsynced from upstream musl, and removed from the exclude list inupdate_musl.pyepoll.cwrappers compiled into libc (epoll_create/epoll_create1/epoll_ctl/epoll_wait/epoll_pwait)SYS_epoll_*->__syscall_epoll_*mappings, declarations inemscripten/syscalls.h, andlibsigs.jssignatures__syscall_epoll_*return-ENOSYS__syscall_epoll_*return-ENOSYS, matching the existing socket stubs insyscalls.cpptools/native_sigs.pyregenerated for the new libc functionsThe actual readiness/wait-queue host integration (the working epoll) follows in a separate PR.