If we include winsock2.h then FD_SET wants an unsigned type for an fd.

apps/apps.h

@@ -193,6 +193,13 @@ extern BIO *bio_err;
 #  endif
 #endif
 
+#ifdef OPENSSL_SYSNAME_WIN32
+#  define openssl_fdset(a,b) FD_SET((unsigned int)a, b)
+#else
+#  define openssl_fdset(a,b) FD_SET(a, b)
+#endif
+
+
 typedef struct args_st
 	{
 	char **data;

apps/s_client.c

@@ -959,19 +959,19 @@ re_start:
 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_NETWARE) && !defined (OPENSSL_SYS_BEOS_R5)
 			if (tty_on)
 				{
-				if (read_tty)  FD_SET(fileno(stdin),&readfds);
-				if (write_tty) FD_SET(fileno(stdout),&writefds);
+				if (read_tty)  openssl_fdset(fileno(stdin),&readfds);
+				if (write_tty) openssl_fdset(fileno(stdout),&writefds);
 				}
 			if (read_ssl)
-				FD_SET(SSL_get_fd(con),&readfds);
+				openssl_fdset(SSL_get_fd(con),&readfds);
 			if (write_ssl)
-				FD_SET(SSL_get_fd(con),&writefds);
+				openssl_fdset(SSL_get_fd(con),&writefds);
 #else
 			if(!tty_on || !write_tty) {
 				if (read_ssl)
-					FD_SET(SSL_get_fd(con),&readfds);
+					openssl_fdset(SSL_get_fd(con),&readfds);
 				if (write_ssl)
-					FD_SET(SSL_get_fd(con),&writefds);
+					openssl_fdset(SSL_get_fd(con),&writefds);
 			}
 #endif
 /*			printf("mode tty(%d %d%d) ssl(%d%d)\n",

apps/s_server.c

@@ -1621,9 +1621,9 @@ static int sv_body(char *hostname, int s, unsigned char *context)
 			{
 			FD_ZERO(&readfds);
 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_NETWARE) && !defined(OPENSSL_SYS_BEOS_R5)
-			FD_SET(fileno(stdin),&readfds);
+			openssl_fdset(fileno(stdin),&readfds);
 #endif
-			FD_SET(s,&readfds);
+			openssl_fdset(s,&readfds);
 			/* Note: under VMS with SOCKETSHR the second parameter is
 			 * currently of type (int *) whereas under other systems
 			 * it is (void *) if you don't have a cast it will choke

apps/s_time.c

@@ -601,7 +601,7 @@ static SSL *doConnection(SSL *scon)
 			i=SSL_get_fd(serverCon);
 			width=i+1;
 			FD_ZERO(&readfds);
-			FD_SET(i,&readfds);
+			openssl_fdset(i,&readfds);
 			/* Note: under VMS with SOCKETSHR the 2nd parameter
 			 * is currently of type (int *) whereas under other
 			 * systems it is (void *) if you don't have a cast it