From d102366e6808f74ef98044374d744e453efdbefa Mon Sep 17 00:00:00 2001 From: user Date: Fri, 17 Jul 2026 12:15:09 +0200 Subject: net: ping - GB-originated ICMP echo (a Game Boy pings the real internet) New `ping [A.B.C.D]` program (PROG_PING=27, bank 29): builds and sends ICMP echo requests from 10.0.0.2, then reads replies off the link port. It keeps reading SLIP frames until it finds *our* echo reply, skipping the IGMP/mDNS/ SSDP multicast noise that shares 10.0.0.0/24. Reply wait uses a generous srecv_nb spin budget since the emulator runs uncapped (no timer syscall yet). Verified over the tunbridge (with NAT): /# ping 10.0.0.1 -> 4/4 received, ttl=64 (the SLIP peer/host) /# ping 1.1.1.1 -> 4/4 received, ttl=56 (Cloudflare, real net!) ttl=56 is a real internet round trip (64 minus the hops). Combined with the host being able to ping the GB, the Game Boy is now a full two-way ICMP host. --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index 2768899..fa642ad 100644 --- a/Makefile +++ b/Makefile @@ -20,7 +20,7 @@ $(BUILD)/%.o: src/%.asm | $(BUILD) # C programs: compiled with SDCC into ROM-bank blobs and INCBIN'd by programs.asm CBLOBS := c/chello.bin c/echo.bin c/true.bin c/false.bin c/uname.bin \ c/pid.bin c/cat.bin c/wc.bin c/head.bin c/args.bin \ - c/ls.bin c/save.bin c/rm.bin c/sh.bin c/ps.bin c/kill.bin c/spin.bin c/blk.bin c/mkdir.bin c/count.bin c/ptest.bin c/necho.bin c/wget.bin c/chat.bin c/netd.bin + c/ls.bin c/save.bin c/rm.bin c/sh.bin c/ps.bin c/kill.bin c/spin.bin c/blk.bin c/mkdir.bin c/count.bin c/ptest.bin c/necho.bin c/wget.bin c/chat.bin c/netd.bin c/ping.bin $(BUILD)/programs.o: $(CBLOBS) # C programs also depend on the shared libc sources -- cgit v1.3.1-sl0p