MG_DISABLE_(DNS|(_SYNC)?_RESOLVER) -> MG_ENABLE_$1

Disable sync resolver by default.

PUBLISHED_FROM=dbaed194e5fe211c07564fe6880649a1aee7f662

docs/c-api/net.h/intro.md

@@ -19,6 +19,7 @@ items:
   - { name: mg_printf.md }
   - { name: mg_vprintf.md }
   - { name: mg_socketpair.md }
+  - { name: mg_resolve.md }
   - { name: mg_check_ip_acl.md }
   - { name: mg_enable_multithreading.md }
   - { name: mg_enable_javascript.md }

docs/c-api/net.h/mg_resolve.md

@@ -0,0 +1,17 @@
+---
+title: "mg_resolve()"
+decl_name: "mg_resolve"
+symbol_kind: "func"
+signature: |
+  int mg_resolve(const char *domain_name, char *ip_addr_buf, size_t buf_len);
+---
+
+Convert domain name into IP address.
+
+This is a utility function. If compilation flags have
+`-DMG_ENABLE_GETADDRINFO`, then `getaddrinfo()` call is used for name
+resolution. Otherwise, `gethostbyname()` is used.
+
+CAUTION: this function can block.
+Return 1 on success, 0 on failure. 
+