Hopefully the final lot of test files.

[exim.git] / src / src / dbfn.c

diff --git a/src/src/dbfn.c b/src/src/dbfn.c
index 928cf00f1c94becf68f07b006dd3da3ef09a75a2..8efdc2ed96e92b9b52d1a1e66f9c3e7e05ec10a3 100644 (file)
--- a/src/src/dbfn.c
+++ b/src/src/dbfn.c
@@ -1,4 +1,4 @@
-/* $Cambridge: exim/src/src/dbfn.c,v 1.3 2005/06/14 10:32:01 ph10 Exp $ */
+/* $Cambridge: exim/src/src/dbfn.c,v 1.7 2005/12/15 11:18:21 ph10 Exp $ */
 
 /*************************************************
 *     Exim - an Internet mail transport agent    *
@@ -80,6 +80,10 @@ Returns:   NULL if the open failed, or the locking failed. After locking
 
            On success, dbblock is returned. This contains the dbm pointer and
            the fd of the locked lock file.
+
+There are some calls that use O_RDWR|O_CREAT for the flags. Having discovered
+this in December 2005, I'm not sure if this is correct or not, but for the
+moment I haven't changed them.
 */
 
 open_db *
@@ -141,7 +145,7 @@ if (rc < 0)
   log_write(0, LOG_MAIN, "Failed to get %s lock for %s: %s",
     ((flags & O_RDONLY) != 0)? "read" : "write", buffer,
     (errno == ETIMEDOUT)? "timed out" : strerror(errno));
-  close(dbblock->lockfd);
+  (void)close(dbblock->lockfd);
   errno = 0;       /* Indicates locking failure */
   return NULL;
   }
@@ -152,10 +156,15 @@ DEBUG(D_hints_lookup) debug_printf("locked %s\n", buffer);
 exclusive access to the database, so we can go ahead and open it. If we are
 expected to create it, don't do so at first, again so that we can detect
 whether we need to change its ownership (see comments about the lock file
-above.) */
+above.) There have been regular reports of crashes while opening hints
+databases - often this is caused by non-matching db.h and the library. To make
+it easy to pin this down, there are now debug statements on either side of the
+open call. */
 
 sprintf(CS buffer, "%s/db/%s", spool_directory, name);
+DEBUG(D_hints_lookup) debug_printf("EXIM_DBOPEN(%s)\n", buffer);
 EXIM_DBOPEN(buffer, flags, EXIMDB_MODE, &(dbblock->dbptr));
+DEBUG(D_hints_lookup) debug_printf("returned from EXIM_DBOPEN\n");
 
 if (dbblock->dbptr == NULL && errno == ENOENT && flags == O_RDWR)
   {
@@ -163,6 +172,7 @@ if (dbblock->dbptr == NULL && errno == ENOENT && flags == O_RDWR)
     debug_printf("%s appears not to exist: trying to create\n", buffer);
   created = TRUE;
   EXIM_DBOPEN(buffer, flags|O_CREAT, EXIMDB_MODE, &(dbblock->dbptr));
+  DEBUG(D_hints_lookup) debug_printf("returned from EXIM_DBOPEN\n");
   }
 
 save_errno = errno;
@@ -200,7 +210,7 @@ if (created && geteuid() == root_uid)
       if (Ustat(buffer, &statbuf) >= 0 && statbuf.st_uid != exim_uid)
         {
         DEBUG(D_hints_lookup) debug_printf("ensuring %s is owned by exim\n", buffer);
-        Uchown(buffer, exim_uid, exim_gid);
+        (void)Uchown(buffer, exim_uid, exim_gid);
         }
       }
     }
@@ -223,13 +233,15 @@ if (dbblock->dbptr == NULL)
         debug_printf("%s", CS string_open_failed(save_errno, "DB file %s\n",
           buffer));
     }
-  close(dbblock->lockfd);
+  (void)close(dbblock->lockfd);
   errno = save_errno;
   return NULL;
   }
 
 DEBUG(D_hints_lookup)
-  debug_printf("opened hints database %s: flags=%x\n", buffer, flags);
+  debug_printf("opened hints database %s: flags=%s\n", buffer,
+    (flags == O_RDONLY)? "O_RDONLY" : (flags == O_RDWR)? "O_RDWR" :
+    (flags == (O_RDWR|O_CREAT))? "O_RDWR|O_CREAT" : "??");
 
 /* Pass back the block containing the opened database handle and the open fd
 for the lock. */
@@ -255,7 +267,7 @@ void
 dbfn_close(open_db *dbblock)
 {
 EXIM_DBCLOSE(dbblock->dbptr);
-close(dbblock->lockfd);
+(void)close(dbblock->lockfd);
 }