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+/***********************************************************
+Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
+Netherlands.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Common definitions for files that use the BSD select system call.
+   This is so complicated because every UNIX variant requires that
+   you include a different set of headers.  Customizing this one file
+   should be easier than patching each of the files using select()... */
+
+
+/* XXX You may have to include some of these only if not already included */
+#include <sys/types.h>
+#include <sys/time.h> /* Implies <time.h> everywhere, as far as I know */
+#include <sys/param.h>
+
+
+/* Hacks for various systems that need hand-holding... */
+
+#ifdef _SEQUENT_
+#include <sys/select.h>
+/* Sequent doesn't seem to define struct timezone anywhere?!?! */
+struct timezone {
+    int tz_minuteswest;
+    int tz_dsttime;
+};
+#endif
+
+#ifdef _AIX /* I *think* this works */
+/* AIX defines fd_set in a separate file.  Sigh... */
+#include <sys/select.h>
+#endif
+
+
+
+/* (Very) old versions of BSD don't define the FD_* set of macros.
+   The following will usually do... */
+
+#ifndef	FD_SETSIZE
+#define	FD_SETSIZE	256
+#endif
+
+#ifndef FD_SET
+
+typedef long	fd_mask;
+
+#define NFDBITS	(sizeof(fd_mask) * NBBY)	/* bits per mask */
+#ifndef howmany
+#define	howmany(x, y)	(((x)+((y)-1))/(y))
+#endif
+
+typedef	struct fd_set {
+	fd_mask	fds_bits[howmany(FD_SETSIZE, NFDBITS)];
+} fd_set;
+
+#define	FD_SET(n, p)	((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
+#define	FD_CLR(n, p)	((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
+#define	FD_ISSET(n, p)	((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
+#define FD_ZERO(p)	bzero((char *)(p), sizeof(*(p)))
+
+#endif /* FD_SET */