Auto merge of #2159 - coolreader18:redox-netdb, r=Amanieu

Add more netdb constants for redox

Author: bors

src/unix/redox/mod.rs

@@ -439,7 +439,25 @@ pub const O_SYMLINK: ::c_int = 0x4000_0000;
 pub const O_NOFOLLOW: ::c_int = -0x8000_0000;
 
 // netdb.h
+pub const AI_PASSIVE: ::c_int = 0x0001;
+pub const AI_CANONNAME: ::c_int = 0x0002;
+pub const AI_NUMERICHOST: ::c_int = 0x0004;
+pub const AI_V4MAPPED: ::c_int = 0x0008;
+pub const AI_ALL: ::c_int = 0x0010;
+pub const AI_ADDRCONFIG: ::c_int = 0x0020;
+pub const AI_NUMERICSERV: ::c_int = 0x0400;
+pub const EAI_BADFLAGS: ::c_int = -1;
+pub const EAI_NONAME: ::c_int = -2;
+pub const EAI_AGAIN: ::c_int = -3;
+pub const EAI_FAIL: ::c_int = -4;
+pub const EAI_NODATA: ::c_int = -5;
+pub const EAI_FAMILY: ::c_int = -6;
+pub const EAI_SOCKTYPE: ::c_int = -7;
+pub const EAI_SERVICE: ::c_int = -8;
+pub const EAI_ADDRFAMILY: ::c_int = -9;
+pub const EAI_MEMORY: ::c_int = -10;
 pub const EAI_SYSTEM: ::c_int = -11;
+pub const EAI_OVERFLOW: ::c_int = -12;
 pub const NI_MAXHOST: ::c_int = 1025;
 pub const NI_MAXSERV: ::c_int = 32;
 pub const NI_NUMERICHOST: ::c_int = 0x0001;
@@ -945,6 +963,17 @@ extern "C" {
     // malloc.h
     pub fn memalign(align: ::size_t, size: ::size_t) -> *mut ::c_void;
 
+    // netdb.h
+    pub fn getnameinfo(
+        addr: *const ::sockaddr,
+        addrlen: ::socklen_t,
+        host: *mut ::c_char,
+        hostlen: ::socklen_t,
+        serv: *mut ::c_char,
+        servlen: ::socklen_t,
+        flags: ::c_int,
+    ) -> ::c_int;
+
     // pthread.h
     pub fn pthread_atfork(
         prepare: ::Option<unsafe extern "C" fn()>,