Import BSDDB 4.7.25 (as of svn r89086)

test/wrap.tcl

@@ -0,0 +1,88 @@
+# See the file LICENSE for redistribution information.
+#
+# Copyright (c) 2000,2008 Oracle.  All rights reserved.
+#
+# $Id: wrap.tcl,v 12.8 2008/01/08 20:58:53 bostic Exp $
+#
+# Sentinel file wrapper for multi-process tests.  This is designed to avoid a
+# set of nasty bugs, primarily on Windows, where pid reuse causes watch_procs
+# to sit around waiting for some random process that's not DB's and is not
+# exiting.
+
+source ./include.tcl
+source $test_path/testutils.tcl
+
+# Arguments:
+if { $argc < 3 } {
+	puts "FAIL: wrap.tcl: Usage: wrap.tcl script log scriptargs"
+	exit
+}
+
+set script [lindex $argv 0]
+set logfile [lindex $argv 1]
+set skip [lindex $argv 2]
+set args [lrange $argv 3 end]
+#
+# Account in args for SKIP command, or not.
+#
+if { $skip != "SKIP" } {
+	set args [lrange $argv 2 end]
+}
+
+# Create a sentinel file to mark our creation and signal that watch_procs
+# should look for us.
+set parentpid [pid]
+set parentsentinel $testdir/begin.$parentpid
+set f [open $parentsentinel w]
+close $f
+
+# Create a Tcl subprocess that will actually run the test.
+set t [open "|$tclsh_path >& $logfile" w]
+
+# Create a sentinel for the subprocess.
+set childpid [pid $t]
+puts "Script watcher process $parentpid launching $script process $childpid."
+set childsentinel $testdir/begin.$childpid
+set f [open $childsentinel w]
+close $f
+
+#
+# For the upgrade tests where a current release tclsh is starting up
+# a tclsh in an older release, we cannot tell it to source the current
+# test.tcl because new things may not exist in the old release.  So,
+# we need to skip that and the script we're running in the old
+# release will have to take care of itself.
+#
+if { $skip != "SKIP" } {
+	puts $t "source $test_path/test.tcl"
+}
+puts $t "set script $script"
+
+# Set up argv for the subprocess, since the args aren't passed in as true
+# arguments thanks to the pipe structure.
+puts $t "set argc [llength $args]"
+puts $t "set argv [list $args]"
+
+set scr $test_path/$script
+puts $t "set scr $scr"
+puts $t {set ret [catch { source $scr } result]}
+puts $t {if { [string length $result] > 0 } { puts $result }}
+puts $t {error_check_good "$scr run: $result: pid [pid]" $ret 0}
+
+# Close the pipe.  This will flush the above commands and actually run the
+# test, and will also return an error a la exec if anything bad happens
+# to the subprocess.  The magic here is that closing a pipe blocks
+# and waits for the exit of processes in the pipeline, at least according
+# to Ousterhout (p. 115).
+
+set ret [catch {close $t} res]
+
+# Write ending sentinel files--we're done.
+set f [open $testdir/end.$childpid w]
+close $f
+set f [open $testdir/end.$parentpid w]
+close $f
+
+error_check_good "Pipe close ($childpid: $script $argv: logfile $logfile)"\
+    $ret 0
+exit $ret