Add experimental unix-only file-control to grow and truncate the database file by a configurable chunk size.

FossilOrigin-Name: 7cf0e851d4c5e826ea22ed08291b7c91d7b1abc7

test/fallocate.test

@@ -0,0 +1,56 @@
+# 2010 July 28
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+if {$::tcl_platform(platform)!="unix"} {
+  finish_test
+  return
+}
+
+file_control_chunksize_test db main [expr 1024*1024]
+
+do_test fallocate-1.1 {
+  execsql {
+    PRAGMA page_size = 1024;
+    PRAGMA auto_vacuum = 1;
+    CREATE TABLE t1(a, b);
+  }
+  file size test.db
+} [expr 1*1024*1024]
+
+do_test fallocate-1.2 {
+  execsql { INSERT INTO t1 VALUES(1, zeroblob(1024*900)) }
+  file size test.db
+} [expr 1*1024*1024]
+
+do_test fallocate-1.3 {
+  execsql { INSERT INTO t1 VALUES(2, zeroblob(1024*900)) }
+  file size test.db
+} [expr 2*1024*1024]
+
+do_test fallocate-1.4 {
+  execsql { DELETE FROM t1 WHERE a = 1 }
+  file size test.db
+} [expr 1*1024*1024]
+
+do_test fallocate-1.5 {
+  execsql { DELETE FROM t1 WHERE a = 2 }
+  file size test.db
+} [expr 1*1024*1024]
+
+do_test fallocate-1.6 {
+  execsql { PRAGMA freelist_count }
+} {0}
+
+finish_test