Changes for new UNIX-specific built-in module 'select' and new header for

interfaces to variants of select() system call, "myselect.h".  This includes
adding fileno() methods to files, sockets and stdwin.

Modules/selectmodule.c

@@ -0,0 +1,194 @@
+/***********************************************************
+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.
+
+******************************************************************/
+
+/* select - Module containing unix select(2) call */
+
+#include "allobjects.h"
+#include "modsupport.h"
+#include "compile.h"
+#include "ceval.h"
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/param.h>
+
+/* XXX Maybe you need to define the FD_* macros here when porting this code */
+
+static object *SelectError;
+
+/* XXX This module should be re-entrant! */
+static object *fd2obj[FD_SETSIZE];
+
+static
+list2set(list, set)
+    object *list;
+    fd_set *set;
+{
+    int i, len, v, max=-1;
+    object *o, *filenomethod, *fno;
+    
+    FD_ZERO(set);
+    len = getlistsize(list);
+    for( i=0; i<len; i++ ) {
+	o = getlistitem(list, i);
+	if ( is_intobject(o) ) {
+	    v = getintvalue(o);
+	} else if ( (filenomethod = getattr(o, "fileno")) != NULL ) {
+	    fno = call_object(filenomethod, NULL);
+	    if ( fno == NULL )
+		return -1;
+	    if ( !is_intobject(fno) ) {
+		err_badarg();
+		return -1;
+	    }
+	    v = getintvalue(fno);
+	    DECREF(fno);
+	} else {
+	    err_badarg();
+	    return -1;
+	}
+	if ( v >= FD_SETSIZE ) {
+	    err_setstr(SystemError, "FD_SETSIZE too low in select()");
+	    return -1;
+	}
+	if ( v > max ) max = v;
+	FD_SET(v, set);
+	fd2obj[v] = o;
+    }
+    return max+1;
+}
+
+static object *
+set2list(set, max)
+    fd_set *set;
+    int max;
+{
+    int i, num=0;
+    object *list, *o;
+
+    for(i=0; i<max; i++)
+      if ( FD_ISSET(i,set) )
+	num++;
+    list = newlistobject(num);
+    num = 0;
+    for(i=0; i<max; i++)
+      if ( FD_ISSET(i,set) ) {
+	  if ( i > FD_SETSIZE ) {
+	      err_setstr(SystemError, "FD_SETSIZE too low in select()");
+	      return NULL;
+	  }
+	  o = fd2obj[i];
+	  if ( o == 0 ) {
+	      err_setstr(SystemError,
+			 "Bad filedescriptor returned from select()");
+	      return NULL;
+	  }
+	  INCREF(o);
+	  setlistitem(list, num, o);
+	  num++;
+    }
+    return list;
+}
+    
+static object *
+select_select(self, args)
+    object *self;
+    object *args;
+{
+    object *ifdlist, *ofdlist, *efdlist;
+    fd_set ifdset, ofdset, efdset;
+    double timeout;
+    struct timeval tv, *tvp;
+    int seconds;
+    int imax, omax, emax, max;
+    int n;
+
+
+    /* Get args. Looks funny because of optional timeout argument */
+    if ( getargs(args, "(OOOd)", &ifdlist, &ofdlist, &efdlist, &timeout) ) {
+	seconds = (int)timeout;
+	timeout = timeout - (double)seconds;
+	tv.tv_sec = seconds;
+	tv.tv_usec = (int)(timeout*1000000.0);
+	tvp = &tv;
+    } else {
+	/* Doesn't have 4 args, that means no timeout */
+	err_clear();
+	if (!getargs(args, "(OOO)", &ifdlist, &ofdlist, &efdlist) )
+	  return 0;
+	tvp = (struct timeval *)0;
+    }
+    if ( !is_listobject(ifdlist) || !is_listobject(ofdlist) ||
+	!is_listobject(efdlist) ) {
+	err_badarg();
+	return 0;
+    }
+
+    bzero((char *)fd2obj, sizeof(fd2obj)); /* Not really needed */
+    
+    /* Convert lists to fd_sets, and get maximum fd number */
+    if( (imax=list2set(ifdlist, &ifdset)) < 0 )
+      return 0;
+    if( (omax=list2set(ofdlist, &ofdset)) < 0 )
+      return 0;
+    if( (emax=list2set(efdlist, &efdset)) < 0 )
+      return 0;
+    max = imax;
+    if ( omax > max ) max = omax;
+    if ( emax > max ) max = emax;
+
+    n = select(max, &ifdset, &ofdset, &efdset, tvp);
+
+    if ( n < 0 ) {
+	err_errno(SelectError);
+	return 0;
+    }
+
+    if ( n == 0 )
+      imax = omax = emax = 0; /* Speedup hack */
+
+    ifdlist = set2list(&ifdset, imax);
+    ofdlist = set2list(&ofdset, omax);
+    efdlist = set2list(&efdset, emax);
+
+    return mkvalue("OOO", ifdlist, ofdlist, efdlist);
+}
+
+
+static struct methodlist select_methods[] = {
+    { "select",	select_select },
+    { 0,	0 },
+};
+
+
+void
+initselect()
+{
+	object *m, *d;
+	m = initmodule("select", select_methods);
+	d = getmoduledict(m);
+	SelectError = newstringobject("select.error");
+	if ( SelectError == NULL || dictinsert(d, "error", SelectError) )
+	  fatal("Cannot define select.error");
+}