/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
- * Ken Stevens, Steve McClure
+ * Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Ken Stevens, Steve McClure, Markus Armbruster
*
- * This program is free software; you can redistribute it and/or modify
+ * Empire 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
+ * the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* ---
*
* ---
*
* file.c: Operations on Empire tables (`files' for historical reasons)
- *
+ *
* Known contributors to this file:
* Dave Pare, 1989
* Steve McClure, 2000
- * Markus Armbruster, 2005-2008
+ * Markus Armbruster, 2005-2009
*/
#include <config.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
+#ifdef _WIN32
+#include <io.h>
+#include <share.h>
+#endif
#include "file.h"
#include "match.h"
#include "misc.h"
#include "nsc.h"
#include "prototypes.h"
+static int open_locked(char *, int, mode_t);
static int ef_realloc_cache(struct empfile *, int);
static int fillcache(struct empfile *, int);
static int do_read(struct empfile *, void *, int, int);
static int do_write(struct empfile *, void *, int, int);
static unsigned get_seqno(struct empfile *, int);
static void new_seqno(struct empfile *, void *);
+static void must_be_fresh(struct empfile *, void *);
static void do_blank(struct empfile *, void *, int, int);
static int ef_check(int);
+static unsigned ef_generation;
+
/*
* Open the file-backed table TYPE (EF_SECTOR, ...).
* HOW are flags to control operation. Naturally, immutable flags are
ef_open(int type, int how, int nelt)
{
struct empfile *ep;
- struct flock lock;
int oflags, fd, fsiz, nslots;
if (ef_check(type) < 0)
oflags = O_RDONLY;
if (how & EFF_CREATE)
oflags |= O_CREAT | O_TRUNC;
-#if defined(_WIN32)
- oflags |= O_BINARY;
-#endif
- if ((fd = open(ep->file, oflags, S_IRWUG)) < 0) {
+ fd = open_locked(ep->file, oflags, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ if (fd < 0) {
logerror("Can't open %s (%s)", ep->file, strerror(errno));
return 0;
}
- lock.l_type = how & EFF_PRIVATE ? F_RDLCK : F_WRLCK;
- lock.l_whence = SEEK_SET;
- lock.l_start = lock.l_len = 0;
- if (fcntl(fd, F_SETLK, &lock) == -1) {
- logerror("Can't lock %s (%s)", ep->file, strerror(errno));
- close(fd);
- return 0;
- }
-
/* get file size */
fsiz = fsize(fd);
if (fsiz % ep->size) {
}
}
+ if (ep->onresize && ep->onresize(type) < 0)
+ return 0;
return 1;
}
+static int
+open_locked(char *name, int oflags, mode_t mode)
+{
+ int rdlonly = (oflags & O_ACCMODE) == O_RDONLY;
+ int fd;
+
+#ifdef _WIN32
+ fd = _sopen(name, oflags | O_BINARY, rdlonly ? SH_DENYNO : SH_DENYWR,
+ mode);
+ if (fd < 0)
+ return -1;
+#else /* !_WIN32 */
+ struct flock lock;
+
+ fd = open(name, oflags, mode);
+ if (fd < 0)
+ return -1;
+
+ lock.l_type = rdlonly ? F_RDLCK : F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = lock.l_len = 0;
+ if (fcntl(fd, F_SETLK, &lock) == -1) {
+ close(fd);
+ return -1;
+ }
+#endif /* !_WIN32 */
+ return fd;
+}
+
/*
* Reallocate cache for table EP to hold COUNT slots.
* The table must not be allocated statically.
return 1;
}
+/*
+ * Open the table TYPE as view of table BASE.
+ * Return non-zero on success, zero on failure.
+ * Beware: views work only as long as BASE doesn't change size!
+ * You must call ef_close(TYPE) before closing BASE.
+ */
+int
+ef_open_view(int type, int base)
+{
+ struct empfile *ep;
+
+ if (CANT_HAPPEN(!EF_IS_VIEW(type)))
+ return -1;
+ ep = &empfile[type];
+ if (CANT_HAPPEN(!(ef_flags(base) & EFF_MEM)))
+ return -1;
+
+ ep->cache = empfile[base].cache;
+ ep->csize = empfile[base].csize;
+ ep->flags |= EFF_MEM;
+ ep->baseid = empfile[base].baseid;
+ ep->cids = empfile[base].cids;
+ ep->fids = empfile[base].fids;
+ return 0;
+}
+
/*
* Close the file-backed table TYPE (EF_SECTOR, ...).
* Return non-zero on success, zero on failure.
ef_close(int type)
{
struct empfile *ep;
- int retval;
+ int retval = 1;
- retval = ef_flush(type);
+ if (ef_check(type) < 0)
+ return 0;
ep = &empfile[type];
- ep->flags &= EFF_IMMUTABLE;
- if (!(ep->flags & EFF_STATIC)) {
- free(ep->cache);
+
+ if (EF_IS_VIEW(type))
ep->cache = NULL;
+ else {
+ if (!ef_flush(type))
+ retval = 0;
+ ep->flags &= EFF_IMMUTABLE;
+ if (!(ep->flags & EFF_STATIC)) {
+ free(ep->cache);
+ ep->cache = NULL;
+ }
+ if (close(ep->fd) < 0) {
+ logerror("Error closing %s (%s)", ep->file, strerror(errno));
+ retval = 0;
+ }
+ ep->fd = -1;
}
- if (close(ep->fd) < 0) {
- logerror("Error closing %s (%s)", ep->file, strerror(errno));
+ ep->baseid = ep->cids = ep->fids = 0;
+ if (ep->onresize && ep->onresize(type) < 0)
retval = 0;
- }
- ep->fd = -1;
return retval;
}
/*
- * Flush table TYPE (EF_SECTOR, ...) to disk.
+ * Flush file-backed table TYPE (EF_SECTOR, ...) to its backing file.
* Do nothing if the table is privately mapped.
* Update timestamps of written elements if table is EFF_TYPED.
* Return non-zero on success, zero on failure.
ef_read(int type, int id, void *into)
{
struct empfile *ep;
- void *from;
+ void *cachep;
if (ef_check(type) < 0)
return 0;
return 0;
if (ep->flags & EFF_MEM) {
- from = ep->cache + id * ep->size;
+ cachep = ep->cache + id * ep->size;
} else {
if (ep->baseid + ep->cids <= id || ep->baseid > id) {
if (fillcache(ep, id) < 1)
return 0;
}
- from = ep->cache + (id - ep->baseid) * ep->size;
+ cachep = ep->cache + (id - ep->baseid) * ep->size;
}
- memcpy(into, from, ep->size);
+ memcpy(into, cachep, ep->size);
+ ef_mark_fresh(type, into);
if (ep->postread)
ep->postread(id, into);
ef_write(int type, int id, void *from)
{
struct empfile *ep;
- char *to;
+ char *cachep;
if (ef_check(type) < 0)
return 0;
ep = &empfile[type];
if (CANT_HAPPEN((ep->flags & (EFF_MEM | EFF_PRIVATE)) == EFF_PRIVATE))
return 0;
- if (ep->prewrite)
- ep->prewrite(id, from);
if (CANT_HAPPEN((ep->flags & EFF_MEM) ? id >= ep->fids : id > ep->fids))
return 0; /* not implemented */
new_seqno(ep, from);
- if (ep->fd >= 0) {
- if (do_write(ep, from, id, 1) < 0)
- return 0;
- }
- if (id >= ep->baseid && id < ep->baseid + ep->cids) {
- /* update the cache if necessary */
- to = ep->cache + (id - ep->baseid) * ep->size;
- if (to != from)
- memcpy(to, from, ep->size);
- }
if (id >= ep->fids) {
/* write beyond end of file extends it, take note */
ep->fids = id + 1;
+ if (ep->onresize && ep->onresize(type) < 0)
+ return 0;
}
+ if (id >= ep->baseid && id < ep->baseid + ep->cids) {
+ cachep = ep->cache + (id - ep->baseid) * ep->size;
+ if (cachep != from)
+ must_be_fresh(ep, from);
+ } else
+ cachep = NULL;
+ if (ep->prewrite)
+ ep->prewrite(id, cachep, from);
+ if (ep->fd >= 0) {
+ if (do_write(ep, from, id, 1) < 0)
+ return 0;
+ }
+ if (cachep && cachep != from) /* update the cache if necessary */
+ memcpy(cachep, from, ep->size);
return 1;
}
if (!(ep->flags & EFF_TYPED))
return;
old_seqno = get_seqno(ep, elt->uid);
- if (CANT_HAPPEN(old_seqno != elt->seqno))
- old_seqno = MAX(old_seqno, elt->seqno);
+ CANT_HAPPEN(old_seqno != elt->seqno);
elt->seqno = old_seqno + 1;
}
+void
+ef_make_stale(void)
+{
+ ef_generation++;
+}
+
+void
+ef_mark_fresh(int type, void *buf)
+{
+ struct empfile *ep;
+
+ if (ef_check(type) < 0)
+ return;
+ ep = &empfile[type];
+ if (!(ep->flags & EFF_TYPED))
+ return;
+ ((struct emptypedstr *)buf)->generation = ef_generation;
+}
+
+static void
+must_be_fresh(struct empfile *ep, void *buf)
+{
+ struct emptypedstr *elt = buf;
+
+ if (!(ep->flags & EFF_TYPED))
+ return;
+ CANT_HAPPEN(elt->generation != (ef_generation & 0xfff));
+}
+
/*
* Extend table TYPE by COUNT elements.
* Any pointers obtained from ef_ptr() become invalid.
char *p;
int need_sentinel, i, id;
- if (ef_check(type) < 0)
+ if (ef_check(type) < 0 || CANT_HAPPEN(EF_IS_VIEW(type)))
return 0;
ep = &empfile[type];
if (CANT_HAPPEN(count < 0))
}
}
ep->fids = id + count;
+ if (ep->onresize && ep->onresize(type) < 0)
+ return 0;
return 1;
}
elt = buf;
elt->seqno = get_seqno(ep, elt->uid);
}
+ ef_mark_fresh(type, buf);
}
/*
struct emptypedstr *elt;
memset(buf, 0, count * ep->size);
- if (ep->flags & EFF_TYPED) {
- for (i = 0; i < count; i++) {
- elt = (struct emptypedstr *)((char *)buf + i * ep->size);
+ for (i = 0; i < count; i++) {
+ elt = (struct emptypedstr *)((char *)buf + i * ep->size);
+ if (ep->flags & EFF_TYPED) {
elt->ef_type = ep->uid;
elt->uid = id + i;
}
+ if (ep->oninit)
+ ep->oninit(elt);
}
}
struct empfile *ep;
int need_sentinel;
- if (ef_check(type) < 0)
+ if (ef_check(type) < 0 || CANT_HAPPEN(EF_IS_VIEW(type)))
return 0;
ep = &empfile[type];
if (CANT_HAPPEN(count < 0 || count > ep->fids))
ep->cids = count - ep->baseid;
}
+ if (ep->onresize && ep->onresize(type) < 0)
+ return 0;
return 1;
}
projects / empserver / blobdiff