LibC: Add a couple of missing errno codes

These are required to compile a port.

Userland/Libraries/LibC/errno_numbers.h

@@ -99,6 +99,8 @@ enum ErrnoCode {
 #define EDOM EDOM
     ECONNREFUSED,
 #define ECONNREFUSED ECONNREFUSED
+    EHOSTDOWN,
+#define EHOSTDOWN EHOSTDOWN
     EADDRNOTAVAIL,
 #define EADDRNOTAVAIL EADDRNOTAVAIL
     EISCONN,
@@ -133,8 +135,14 @@ enum ErrnoCode {
 #define ENOPROTOOPT ENOPROTOOPT
     ENOTCONN,
 #define ENOTCONN ENOTCONN
+    ESHUTDOWN,
+#define ESHUTDOWN ESHUTDOWN
+    ETOOMANYREFS,
+#define ETOOMANYREFS ETOOMANYREFS
     EPROTONOSUPPORT,
 #define EPROTONOSUPPORT EPROTONOSUPPORT
+    ESOCKTNOSUPPORT,
+#define ESOCKTNOSUPPORT ESOCKTNOSUPPORT
     EDEADLK,
 #define EDEADLK EDEADLK
     ETIMEDOUT,

Userland/Libraries/LibC/string.cpp

@@ -311,6 +311,7 @@ const char* const sys_errlist[] = {
     "Directory not empty",
     "Math argument out of domain",
     "Connection refused",
+    "Host is down",
     "Address not available",
     "Already connected",
     "Connection aborted",
@@ -328,7 +329,10 @@ const char* const sys_errlist[] = {
     "No message",
     "No protocol option",
     "Not connected",
+    "Transport endpoint has shutdown",
+    "Too many references",
     "Protocol not supported",
+    "Socket type not supported",
     "Resource deadlock would occur",
     "Timed out",
     "Wrong protocol type",
@@ -342,6 +346,7 @@ const char* const sys_errlist[] = {
     "State not recoverable",
     "The highest errno +1 :^)",
 };
+static_assert(array_size(sys_errlist) == (EMAXERRNO + 1));
 
 int sys_nerr = EMAXERRNO;
 

Userland/Utilities/strace.cpp

@@ -87,6 +87,7 @@ HANDLE(EWHYTHO)
 HANDLE(ENOTEMPTY)
 HANDLE(EDOM)
 HANDLE(ECONNREFUSED)
+HANDLE(EHOSTDOWN)
 HANDLE(EADDRNOTAVAIL)
 HANDLE(EISCONN)
 HANDLE(ECONNABORTED)
@@ -104,7 +105,10 @@ HANDLE(ENOLCK)
 HANDLE(ENOMSG)
 HANDLE(ENOPROTOOPT)
 HANDLE(ENOTCONN)
+HANDLE(ESHUTDOWN)
+HANDLE(ETOOMANYREFS)
 HANDLE(EPROTONOSUPPORT)
+HANDLE(ESOCKTNOSUPPORT)
 HANDLE(EDEADLK)
 HANDLE(ETIMEDOUT)
 HANDLE(EPROTOTYPE)