Move non-blocking code into its own /port file, for code clarity.

src/port/noblock.c

@@ -0,0 +1,35 @@
+/*-------------------------------------------------------------------------
+ *
+ * noblock.c
+ *	  set a file descriptor as non-blocking
+ *
+ * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  $PostgreSQL: pgsql/src/port/noblock.c,v 1.1 2004/03/10 21:12:49 momjian Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/types.h>
+#include <fcntl.h>
+
+bool set_noblock(int sock)
+{
+#if !defined(WIN32) && !defined(__BEOS__)
+	return (fcntl(sock, F_SETFL, O_NONBLOCK) != -1);
+#else
+	long ioctlsocket_ret = 1;
+	
+	/* Returns non-0 on failure, while fcntl() returns -1 on failure */
+#ifdef WIN32
+	return (ioctlsocket(sock, FIONBIO, &ioctlsocket_ret) == 0);
+#endif
+#ifdef __BEOS__
+	return (ioctl(sock, FIONBIO, &ioctlsocket_ret) == 0);
+#endif
+#endif
+}