Excerpt from winsock2.h  

/* Error codes */  

#define WSABASEERR              10000  

#define WSAEINTR                (WSABASEERR+4) 
#define WSAEBADF                (WSABASEERR+9) 
#define WSAEACCES               (WSABASEERR+13) 
#define WSAEFAULT               (WSABASEERR+14) 
#define WSAEINVAL               (WSABASEERR+22) 
#define WSAEMFILE               (WSABASEERR+24)  

#define WSAEWOULDBLOCK          (WSABASEERR+35) 
#define WSAEINPROGRESS          (WSABASEERR+36) 
#define WSAEALREADY             (WSABASEERR+37) 
#define WSAENOTSOCK             (WSABASEERR+38) 
#define WSAEDESTADDRREQ         (WSABASEERR+39) 
#define WSAEMSGSIZE             (WSABASEERR+40) 
#define WSAEPROTOTYPE           (WSABASEERR+41) 
#define WSAENOPROTOOPT          (WSABASEERR+42) 
#define WSAEPROTONOSUPPORT      (WSABASEERR+43) 
#define WSAESOCKTNOSUPPORT      (WSABASEERR+44) 
#define WSAEOPNOTSUPP           (WSABASEERR+45) 
#define WSAEPFNOSUPPORT         (WSABASEERR+46) 
#define WSAEAFNOSUPPORT         (WSABASEERR+47) 
#define WSAEADDRINUSE           (WSABASEERR+48) 
#define WSAEADDRNOTAVAIL        (WSABASEERR+49) 
#define WSAENETDOWN             (WSABASEERR+50) 
#define WSAENETUNREACH          (WSABASEERR+51) 
#define WSAENETRESET            (WSABASEERR+52) 
#define WSAECONNABORTED         (WSABASEERR+53) 
#define WSAECONNRESET           (WSABASEERR+54) 
#define WSAENOBUFS              (WSABASEERR+55) 
#define WSAEISCONN              (WSABASEERR+56) 
#define WSAENOTCONN             (WSABASEERR+57) 
#define WSAESHUTDOWN            (WSABASEERR+58) 
#define WSAETOOMANYREFS         (WSABASEERR+59) 
#define WSAETIMEDOUT            (WSABASEERR+60) 
#define WSAECONNREFUSED         (WSABASEERR+61) 
#define WSAELOOP                (WSABASEERR+62) 
#define WSAENAMETOOLONG         (WSABASEERR+63) 
#define WSAEHOSTDOWN            (WSABASEERR+64) 
#define WSAEHOSTUNREACH         (WSABASEERR+65) 
#define WSAENOTEMPTY            (WSABASEERR+66) 
#define WSAEUSERS               (WSABASEERR+68) 
#define WSAEDQUOT               (WSABASEERR+69) 
#define WSAESTALE               (WSABASEERR+70) 
#define WSAEREMOTE              (WSABASEERR+71)  

/* Extended Windows Sockets error codes */ 
#define WSASYSNOTREADY          (WSABASEERR+91) 
#define WSAVERNOTSUPPORTED      (WSABASEERR+92) 
#define WSANOTINITIALISED       (WSABASEERR+93) 
#define WSAEDISCON              (WSABASEERR+101) 
#define WSAENOMORE              (WSABASEERR+102) 
#define WSAECANCELLED           (WSABASEERR+103) 
#define WSAEINVALIDPROCTABLE    (WSABASEERR+104) 
#define WSAEINVALIDPROVIDER     (WSABASEERR+105) 
#define WSAEPROVIDERFAILEDINIT  (WSABASEERR+106) 
#define WSASYSCALLFAILURE       (WSABASEERR+107) 
#define WSASERVICE_NOT_FOUND    (WSABASEERR+108) 
#define WSATYPE_NOT_FOUND       (WSABASEERR+109)
define WSA_E_NO_MORE            (WSABASEERR+110) 
#define WSA_E_CANCELLED         (WSABASEERR+111) 
#define WSAEREFUSED             (WSABASEERR+112)  

#define WSAHOST_NOT_FOUND       (WSABASEERR+1001) 
#define WSATRY_AGAIN            (WSABASEERR+1002) 
#define WSANO_RECOVERY          (WSABASEERR+1003) 
#define WSANO_DATA              (WSABASEERR+1004) 
#define WSANO_ADDRESS           WSANO_DATA

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