fix: expose errorno from ffi-rs (#316)

Author: hertzg

lib/ffi-bindings.js

@@ -10,24 +10,26 @@ const createFFI = () => {
 
   return {
     setsockopt: (fd, level, name, value, valueLength) => {
-      const ret = load({
+      const { value: ret, errnoCode } = load({
         library: LIBRARY_NAME,
         funcName: 'setsockopt',
         retType: cInt,
         paramsType: [cInt, cInt, cInt, cVoidRef, cInt],
         paramsValue: [fd, level, name, value, valueLength],
+        errno: true,
       })
-      return ret
+      return [ret, errnoCode]
     },
     getsockopt: (fd, level, name, value, valueLength) => {
-      const ret = load({
+      const { value: ret, errnoCode } = load({
         library: LIBRARY_NAME,
         funcName: 'getsockopt',
         retType: cInt,
         paramsType: [cInt, cInt, cInt, cVoidRef, cVoidRef],
         paramsValue: [fd, level, name, value, valueLength],
+        errno: true,
       })
-      return ret
+      return [ret, errnoCode]
     },
   }
 }
@@ -51,10 +53,9 @@ const setsockopt = (fd, level, name, value, valueLength) => {
     return false
   }
 
-  const err = ffi().setsockopt(fd, level, name, value, valueLength)
+  const [ret, errno] = ffi().setsockopt(fd, level, name, value, valueLength)
 
-  if (err !== 0) {
-    const errno = 9 // FIXME: there's no FFI.errno() in ffi-rs
+  if (ret !== 0) {
     throw errnoException(errno, 'setsockopt')
   }
 
@@ -66,10 +67,9 @@ const getsockopt = (fd, level, name, value, valueLength) => {
     return false
   }
 
-  const err = ffi().getsockopt(fd, level, name, value, valueLength)
+  const [ret, errno] = ffi().getsockopt(fd, level, name, value, valueLength)
 
-  if (err !== 0) {
-    const errno = 9 // FIXME: there's no FFI.errno() in ffi-rs
+  if (ret !== 0) {
     throw errnoException(errno, 'getsockopt')
   }
   return true

package-lock.json

@@ -50,7 +50,7 @@
   },
   "homepage": "https://hertzg.github.io/node-net-keepalive/",
   "dependencies": {
-    "ffi-rs": "1.0.58"
+    "ffi-rs": "1.0.60"
   },
   "devDependencies": {
     "@commitlint/cli": "^18.0.0",