empire/empserver
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(ef_open): Lock the file. This prevents two programs (servers in

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particular) running on the same game state.  fairland does not use
ef_open() at this time, and thus ignores the lock.
This commit is contained in:
Markus Armbruster 2006-08-02 18:05:04 +00:00
parent 18417fdef6
commit de124108de
1 changed files with 9 additions and 0 deletions
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9
src/lib/common/file.c
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@ -66,6 +66,7 @@ int
ef_open(int type, int how) ef_open(int type, int how)
{ {
struct empfile *ep; struct empfile *ep;
struct flock lock;
int oflags, fd, fsiz, size; int oflags, fd, fsiz, size;
if (ef_check(type) < 0) if (ef_check(type) < 0)
@ -90,6 +91,14 @@ ef_open(int type, int how)
return 0; return 0;
} }
lock.l_type = how & EFF_RDONLY ? 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));
return 0;
}
/* get file size */ /* get file size */
fsiz = fsize(fd); fsiz = fsize(fd);
if (fsiz % ep->size) { if (fsiz % ep->size) {