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wsasocketpair.c
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wsasocketpair.c
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// This file is a part of Julia. License is MIT: https://julialang.org/license
// This is a compatibility implementation of the unix "socketpair"
// function using the Windows Sockets 2 API.
// Note that the return value is a WSA SOCKET (void*),
// not a fd (int) since the msvcrt handling of
// sockets-as-file-descriptors is generally buggy,
// and not a Win32 HANDLE (void*) either,
// since this is not a Win32 API call
// (despite MSDN documentation to the contrary,
// it will not work with ReadFile/WriteFile)
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <io.h>
#define AF_UNIX 1
__declspec(dllexport) int wsasocketpair(int domain, int type, int protocol, SOCKET socket_vector[2]) {
SOCKET server, client0, client1;
SOCKADDR_IN name;
int namelen;
int err;
if (domain != AF_UNIX) {
WSASetLastError(WSAEAFNOSUPPORT);
return -1;
}
server = socket(AF_INET, type, protocol);
if (server == INVALID_SOCKET) {
return -1;
}
name.sin_family = AF_INET;
name.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
name.sin_port = 0;
err = bind(server, (SOCKADDR*)&name, sizeof(name));
if (err == SOCKET_ERROR) {
int lasterr = WSAGetLastError();
closesocket(server);
WSASetLastError(lasterr);
return -1;
}
err = listen(server, 1);
if (err == SOCKET_ERROR) {
int lasterr = WSAGetLastError();
closesocket(server);
WSASetLastError(lasterr);
return -1;
}
namelen = sizeof(name);
err = getsockname(server, (SOCKADDR*)&name, &namelen);
if (err == SOCKET_ERROR) {
int lasterr = WSAGetLastError();
closesocket(server);
WSASetLastError(lasterr);
return -1;
}
client0 = socket(AF_INET, type, protocol);
if (client0 == INVALID_SOCKET) {
int lasterr = WSAGetLastError();
closesocket(server);
WSASetLastError(lasterr);
return -1;
}
err = connect(client0, (SOCKADDR*)&name, sizeof(name));
if (err == SOCKET_ERROR) {
int lasterr = WSAGetLastError();
closesocket(client0);
closesocket(server);
WSASetLastError(lasterr);
return -1;
}
client1 = accept(server, NULL, NULL);
if (err == INVALID_SOCKET) {
int lasterr = WSAGetLastError();
closesocket(server);
closesocket(client0);
WSASetLastError(lasterr);
return -1;
}
closesocket(server);
socket_vector[0] = client0;
socket_vector[1] = client1;
return 0;
}