Add comment on Go runtime requirements for poll_oneoff

leonm1 · leonm1 · commit 86a7067a64bb · 2026-04-06T09:55:10.000-04:00
Signed-off-by: Matt Leon &lt;mattleon@google.com&gt;
diff --git a/src/exports.cc b/src/exports.cc
@@ -1282,6 +1282,9 @@ Word wasi_unstable_poll_oneoff(Word /*in*/, Word /*out*/, Word /*nsubscriptions*
     return 21; // __WASI_EFAULT - If there is a failure setting memory
   }
 
+  // Go runtime requires poll_oneoff to return ESUCCESS. See
+  // https://github.com/golang/go/blob/0886e65b119e5be88846b1580451dc2b0d6f6fd0/src/runtime/os_wasip1.go#L186-L188
+  // and more context in github.com/proxy-wasm/proxy-wasm-cpp-host/issues/497.
   return 0; // __WASI_ESUCCESS
 }
 

Original file line number	Diff line number	Diff line change
`@@ -1282,6 +1282,9 @@ Word wasi_unstable_poll_oneoff(Word /in/, Word /out/, Word /nsubscriptions`
`1282`	`1282`	`return 21; // __WASI_EFAULT - If there is a failure setting memory`
`1283`	`1283`	`}`
`1284`	`1284`
	`1285`	`+ // Go runtime requires poll_oneoff to return ESUCCESS. See`
	`1286`	`+ // https://github.com/golang/go/blob/0886e65b119e5be88846b1580451dc2b0d6f6fd0/src/runtime/os_wasip1.go#L186-L188`
	`1287`	`+ // and more context in github.com/proxy-wasm/proxy-wasm-cpp-host/issues/497.`
`1285`	`1288`	`return 0; // __WASI_ESUCCESS`
`1286`	`1289`	`}`
`1287`	`1290`