win32: reimplement socket()

2 files changed, 32 insertions, 1 deletions

diff --git a/include/mingw.h b/include/mingw.h
index d9a2fabd1..b2d73ce1b 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -174,7 +174,11 @@ NOIMPL(ioctl,int fd UNUSED_PARAM, int code UNUSED_PARAM,...);
  */
 #define hstrerror strerror
 
-NOIMPL(mingw_socket,int domain UNUSED_PARAM, int type UNUSED_PARAM, int protocol UNUSED_PARAM);
+#ifdef CONFIG_WIN32_NET
+int mingw_socket(int domain, int type, int protocol);
+
+# define socket mingw_socket
+#endif
 NOIMPL(mingw_sendto,SOCKET s UNUSED_PARAM, const char *buf UNUSED_PARAM, int len UNUSED_PARAM, int flags UNUSED_PARAM, const struct sockaddr *sa UNUSED_PARAM, int salen UNUSED_PARAM);
 NOIMPL(mingw_listen,SOCKET s UNUSED_PARAM,int backlog UNUSED_PARAM);
 NOIMPL(mingw_bind,SOCKET s UNUSED_PARAM,const struct sockaddr* sa UNUSED_PARAM,int salen UNUSED_PARAM);
diff --git a/win32/net.c b/win32/net.c
index 82c29e57c..98204b99c 100644
--- a/win32/net.c
+++ b/win32/net.c
@@ -18,3 +18,30 @@ void init_winsock(void)
                                      WSAGetLastError());
         atexit((void(*)(void)) WSACleanup); /* may conflict with other atexit? */
 }
+
+int mingw_socket(int domain, int type, int protocol)
+{
+        int sockfd;
+        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
+        if (s == INVALID_SOCKET) {
+                /*
+                 * WSAGetLastError() values are regular BSD error codes
+                 * biased by WSABASEERR.
+                 * However, strerror() does not know about networking
+                 * specific errors, which are values beginning at 38 or so.
+                 * Therefore, we choose to leave the biased error code
+                 * in errno so that _if_ someone looks up the code somewhere,
+                 * then it is at least the number that are usually listed.
+                 */
+                errno = WSAGetLastError();
+                return -1;
+        }
+        /* convert into a file descriptor */
+        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
+                closesocket(s);
+                bb_error_msg("unable to make a socket file descriptor: %s",
+                             strerror(errno));
+                return -1;
+        }
+        return sockfd;
+}