Garbage collection to side-step sparse file descriptor problem.

(io_select, io_flush, io_iopfromfd): Unused, remove.
(io_open): Allow more than one open for the same file descriptor.
The check is the last remaining use of io_list[], and it's
unimportant.
(io_list, niop, io_init): io_list[] no longer serves any purpose,
remove.  Sparse allocation of file descriptors (deplorable misfeature
of Winsock, at least some versions) is no longer a problem.
(getfdtablesize): Unused, remove.  Was broken for Windows anyway.

include/empio.h

@@ -59,8 +59,6 @@ extern int io_input(struct iop *, int);
 extern int io_inputwaiting(struct iop *);
 extern int io_outputwaiting(struct iop *);
 extern int io_output(struct iop *, int);
-extern int io_select(struct timeval *);
-extern void io_flush(int);
 extern int io_peek(struct iop *, s_char *, int);
 extern int io_read(struct iop *, s_char *, int);
 extern int io_write(struct iop *, s_char *, int, int);
@@ -72,6 +70,5 @@ extern int io_conn(struct iop *);
 extern int io_error(struct iop *);
 extern int io_eof(struct iop *);
 extern int io_fileno(struct iop *);
-extern struct iop *io_iopfromfd(int);
 
 #endif /* _EMPIO_H_ */

include/prototypes.h

@@ -412,7 +412,6 @@ extern int roll(int);
 extern int roundavg(double);
 extern int chance(double);
 extern void disassoc(void);
-extern int getfdtablesize(void);
 extern s_char *getstarg(s_char *, s_char *, s_char *);
 extern s_char *getstring(s_char *, s_char *);
 #if !defined(_WIN32)

src/lib/gen/Makefile

@@ -35,13 +35,13 @@ include ../../make.defs
 LIB = $(SRCDIR)/lib/libgen.a
 NTLIB = $(SRCDIR)\lib\libgen.lib
 
-OBJS =  atoip.o chance.o copy.o disassoc.o dtable.o \
+OBJS =  atoip.o chance.o copy.o disassoc.o \
 	emp_config.o getstarg.o getstring.o inet.o io.o \
 	io_mask.o ioqueue.o mapdist.o minmax.o numstr.o onearg.o \
 	parse.o plur.o queue.o round.o scthash.o \
 	strdup.o
 
-NTOBJS = atoip.obj chance.obj copy.obj disassoc.obj dtable.obj \
+NTOBJS = atoip.obj chance.obj copy.obj disassoc.obj \
 	emp_config.obj getstarg.obj getstring.obj \
 	inet.obj io.obj io_mask.obj ioqueue.obj mapdist.obj minmax.obj \
 	numstr.obj onearg.obj parse.obj plur.obj queue.obj round.obj \

src/lib/gen/dtable.c

@@ -1,49 +0,0 @@
-/*
- *  Empire - A multi-player, client/server Internet based war game.
- *  Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
- *                           Ken Stevens, Steve McClure
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
- *  ---
- *
- *  See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
- *  related information and legal notices. It is expected that any future
- *  projects/authors will amend these files as needed.
- *
- *  ---
- *
- *  dtable.c: Machine-dependant descriptor table management
- * 
- *  Known contributors to this file:
- *     Doug Hay, 1998
- */
-
-#if !defined(_WIN32)
-#include <unistd.h>
-#endif
-#include "gen.h"
-
-int
-getfdtablesize(void)
-{
-#if defined(_WIN32)
-    return (_NFILE);
-#elif defined(hpux)
-    return (int)sysconf(_SC_OPEN_MAX);
-#else
-    return getdtablesize();
-#endif
-}

src/lib/gen/io.c

@@ -66,8 +66,6 @@
 
 extern struct player *player;	/* XXX */
 
-static struct iop **io_list;
-static int niop;
 static struct io_mask *iom;
 static int fdmax;		/* largest file descriptor seen */
 static fd_set newoutput;
@@ -86,24 +84,16 @@ void
 io_init(void)
 {
     iom = iom_create(IO_READ | IO_WRITE);
-    niop = getfdtablesize();
-    io_list = (struct iop **)calloc(niop, sizeof(*io_list));
     fdmax = 0;
     FD_ZERO(&newoutput);
 }
 
 struct iop *
-io_open(int fd, int flags, int bufsize, int (*notify)(void),
+io_open(int fd, int flags, int bufsize, int (*notify) (void),
 	s_char *assoc)
 {
     struct iop *iop;
 
-    if (fd < 0 || niop < fd)
-	return NULL;
-    if (io_list[fd] != 0) {
-	/* already exists */
-	return NULL;
-    }
     flags = flags & (IO_READ | IO_WRITE | IO_NBLOCK | IO_NEWSOCK);
     if ((flags & (IO_READ | IO_WRITE)) == 0)
 	return NULL;
@@ -124,7 +114,6 @@ io_open(int fd, int flags, int bufsize, int (*notify)(void),
     iop->flags = flags;
     iop->assoc = assoc;
     iop->notify = notify;
-    io_list[fd] = iop;
     iom_set(iom, flags, fd);
     if (fd > fdmax) fdmax = fd;
     return iop;
@@ -140,7 +129,6 @@ io_close(struct iop *iop)
 	ioq_destroy(iop->output);
     iom_clear(iom, iop->flags, iop->fd);
     FD_CLR(iop->fd, &newoutput);
-    io_list[iop->fd] = 0;
 #if !defined(_WIN32)
     (void)close(iop->fd);
 #else
@@ -337,56 +325,6 @@ io_output(struct iop *iop, int waitforoutput)
     return cc;
 }
 
-int
-io_select(struct timeval *tv)
-{
-    fd_set *readmask;
-    fd_set *writemask;
-    int n;
-    int maxfd;
-    int fd;
-    struct iop *iop;
-
-    iom_getmask(iom, &maxfd, &readmask, &writemask);
-    n = select(maxfd + 1, readmask, writemask, NULL, tv);
-    if (n <= 0) {
-	if (errno == EINTR)
-	    return 0;
-	return -1;
-    }
-    for (fd = 0; fd <= maxfd; ++fd) {
-	if (!FD_ISSET(fd, readmask)) continue;
-	iop = io_list[fd];
-	if ((iop->flags & IO_NEWSOCK) == 0)
-	    (void)io_input(iop, IO_NOWAIT);
-	if (iop->notify != 0)
-	    iop->notify(iop, IO_READ, iop->assoc);
-	FD_CLR(fd, readmask);
-    }
-    for (fd = 0; fd <= maxfd; ++fd) {
-	if (!FD_ISSET(fd, writemask)) continue;
-	iop = io_list[fd];
-	if (io_output(iop, IO_NOWAIT) < 0 && iop->notify != 0)
-	    iop->notify(iop, IO_WRITE, iop->assoc);
-	FD_CLR(fd, writemask);
-    }
-    return n;
-}
-
-void
-io_flush(int doWait)
-{
-    int fd;
-    struct iop *iop;
-
-    for (fd = 0; fd <= fdmax; ++fd) {
-	if (!FD_ISSET(fd, &newoutput)) continue;
-	iop = io_list[fd];
-	if (io_output(iop, doWait) < 0 && iop->notify != 0)
-	    iop->notify(iop, IO_WRITE, iop->assoc);
-    }
-}
-
 int
 io_peek(struct iop *iop, s_char *buf, int nbytes)
 {
@@ -524,11 +462,3 @@ io_fileno(struct iop *iop)
 {
     return iop->fd;
 }
-
-struct iop *
-io_iopfromfd(int fd)
-{
-    if (fd < 0 || niop < fd)
-	return NULL;
-    return io_list[fd];
-}