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diff --git a/lib9p/tests/testclient-sess.explog b/lib9p/tests/testclient-sess.explog
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+# lib9p/tests/testclient-sess.explog - Expected 9P logfile of testclient-sess.c
+#
+# Copyright (C) 2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# numeric downgrade, unknown ext ###############################################
+> Tversion { tag=0 max_msg_size=57 version="9P2025.x" }
+< Rversion { tag=0 max_msg_size=57 version="9P2000" }
+
+# numeric downgrade, known ext #################################################
+> Tversion { tag=0 max_msg_size=57 version="9P2025.u" }
+< Rversion { tag=0 max_msg_size=57 version="9P2000.u" }
+
+# ext version, users ###########################################################
+> Tversion { tag=0 max_msg_size=8192 version="9P2000.u" }
+< Rversion { tag=0 max_msg_size=4120 version="9P2000.u" }
+> Tattach { tag=0 fid=0 afid=NOFID uname="alice" aname="" unum=1000 }
+< Rattach { tag=0 qid={ type=(DIR) vers=1 path=1 } }
+> Tattach { tag=0 fid=1 afid=NOFID uname="bob" aname="" unum=1001 }
+< Rattach { tag=0 qid={ type=(DIR) vers=1 path=1 } }
+> Twalk { tag=0 fid=0 newfid=2 nwname=1 wname=[ "whoami" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(0) vers=1 path=8 } ] }
+> Twalk { tag=0 fid=1 newfid=3 nwname=1 wname=[ "whoami" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(0) vers=1 path=8 } ] }
+> Topen { tag=0 fid=2 mode=(MODE_READ) }
+< Ropen { tag=0 qid={ type=(0) vers=1 path=8 } iounit=0 }
+> Topen { tag=0 fid=3 mode=(MODE_READ) }
+< Ropen { tag=0 qid={ type=(0) vers=1 path=8 } iounit=0 }
+> Tread { tag=0 fid=2 offset=0 count=100 }
+< Rread { tag=0 count=11 data="1000 alice\n" }
+> Tread { tag=0 fid=3 offset=0 count=100 }
+< Rread { tag=0 count=9 data="1001 bob\n" }
+
+# walk #########################################################################
+> Tversion { tag=0 max_msg_size=8192 version="9P2000" }
+< Rversion { tag=0 max_msg_size=4120 version="9P2000" }
+> Tattach { tag=0 fid=0 afid=NOFID uname="nobody" aname="" unum=0 }
+< Rattach { tag=0 qid={ type=(DIR) vers=1 path=1 } }
+
+# dup
+> Twalk { tag=0 fid=0 newfid=1 nwname=0 wname=[ ] }
+< Rwalk { tag=0 nwqid=0 wqid=[ ] }
+
+# "The walk request carries as arguments an existing fid"...
+> Twalk { tag=0 fid=2 newfid=3 nwname=0 wname=[ ] }
+< Rerror { tag=0 errstr="bad file number 2" errnum=L_EBADF }
+
+# ..."and a proposed newfid"...
+> Twalk { tag=0 fid=1 newfid=NOFID nwname=0 wname=[ ] }
+< Rerror { tag=0 errstr="cannot assign to NOFID" errnum=L_EBADF }
+
+# ..."(which must not be in use"...
+> Twalk { tag=0 fid=1 newfid=0 nwname=0 wname=[ ] }
+< Rerror { tag=0 errstr="FID already in use" errnum=L_EBADF }
+
+# ..."unless it is the same as fid)"...
+> Twalk { tag=0 fid=1 newfid=1 nwname=0 wname=[ ] }
+< Rwalk { tag=0 nwqid=0 wqid=[ ] }
+
+# ... "that the client wishes to associate with the result of
+# traversing the directory hierarchy by `walking' the heierarchy using
+# the successive path name elements wname."...
+
+# ..."The fid must represent a directory"...
+> Twalk { tag=0 fid=1 newfid=2 nwname=1 wname=[ "README.md" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(0) vers=1 path=4 } ] }
+> Twalk { tag=0 fid=2 newfid=3 nwname=1 wname=[ ".." ] }
+< Rerror { tag=0 errstr="not a directory" errnum=L_ENOTDIR }
+
+# ..."unless zero path name elements are specified."
+> Twalk { tag=0 fid=2 newfid=3 nwname=0 wname=[ ] }
+< Rwalk { tag=0 nwqid=0 wqid=[ ] }
+
+# "The fid must be valid in the current session" (tested above)...
+
+# ..."and must not have been opened for I/O by an open or create
+# message."...
+> Topen { tag=0 fid=3 mode=(MODE_READ) }
+< Ropen { tag=0 qid={ type=(0) vers=1 path=4 } iounit=0 }
+> Twalk { tag=0 fid=3 newfid=4 nwname=0 wname=[ ] }
+< Rerror { tag=0 errstr="cannot walk on FID open for I/O" errnum=L_EALREADY }
+
+# flush ########################################################################
+> Tversion { tag=0 max_msg_size=8192 version="9P2000" }
+< Rversion { tag=0 max_msg_size=4120 version="9P2000" }
+> Tattach { tag=0 fid=0 afid=NOFID uname="nobody" aname="" unum=0 }
+< Rattach { tag=0 qid={ type=(DIR) vers=1 path=1 } }
+
+# flush, but original response comes back first
+> Twalk { tag=0 fid=0 newfid=1 nwname=1 wname=[ "flush-read" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(0) vers=1 path=9 } ] }
+> Topen { tag=0 fid=1 mode=(MODE_READ) }
+< Ropen { tag=0 qid={ type=(0) vers=1 path=9 } iounit=0 }
+> Tread { tag=0 fid=1 offset=0 count=10 }
+> Tflush { tag=1 oldtag=0 }
+< Rread { tag=0 count=6 data="Sloth\n" }
+< Rflush { tag=1 }
+
+# flush, original request is aborted with error
+> Twalk { tag=0 fid=0 newfid=2 nwname=1 wname=[ "flush-error" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(0) vers=1 path=10 } ] }
+> Topen { tag=0 fid=2 mode=(MODE_READ) }
+< Ropen { tag=0 qid={ type=(0) vers=1 path=10 } iounit=0 }
+> Tread { tag=0 fid=2 offset=0 count=10 }
+> Tflush { tag=1 oldtag=0 }
+< Rerror { tag=0 errstr="request canceled by flush" errnum=L_ECANCELED }
+< Rflush { tag=1 }
+
+# flush, original request is aborted without error
+> Twalk { tag=0 fid=0 newfid=3 nwname=1 wname=[ "flush-silent" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(0) vers=1 path=11 } ] }
+> Topen { tag=0 fid=3 mode=(MODE_READ) }
+< Ropen { tag=0 qid={ type=(0) vers=1 path=11 } iounit=0 }
+> Tread { tag=0 fid=3 offset=0 count=10 }
+> Tflush { tag=1 oldtag=0 }
+< Rflush { tag=1 }
+
+# multiflush, original request is aborted without error
+> Twalk { tag=0 fid=0 newfid=4 nwname=1 wname=[ "flush-slowsilent" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(0) vers=1 path=12 } ] }
+> Topen { tag=0 fid=4 mode=(MODE_READ) }
+< Ropen { tag=0 qid={ type=(0) vers=1 path=12 } iounit=0 }
+> Tread { tag=0 fid=4 offset=0 count=10 }
+> Tflush { tag=1 oldtag=0 }
+> Tflush { tag=2 oldtag=0 }
+< Rflush { tag=2 }
+
+# flush, but flush is flushed
+> Twalk { tag=0 fid=0 newfid=5 nwname=1 wname=[ "flush-slowread" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(0) vers=1 path=13 } ] }
+> Topen { tag=0 fid=5 mode=(MODE_READ) }
+< Ropen { tag=0 qid={ type=(0) vers=1 path=13 } iounit=0 }
+> Tread { tag=0 fid=5 offset=0 count=10 }
+> Tflush { tag=1 oldtag=0 }
+> Tflush { tag=2 oldtag=1 }
+< Rflush { tag=2 }
+< Rread { tag=0 count=6 data="Sloth\n" }
+
+# flush, unknown tag
+> Tflush { tag=0 oldtag=99 }
+< Rflush { tag=0 }
+
+# flushed by Tversion
+> Tread { tag=0 fid=3 offset=0 count=10 }
+
+# shutdown #####################################################################
+> Tversion { tag=0 max_msg_size=8192 version="9P2000" }
+< Rversion { tag=0 max_msg_size=4120 version="9P2000" }
+> Tattach { tag=0 fid=0 afid=NOFID uname="nobody" aname="" unum=0 }
+< Rattach { tag=0 qid={ type=(DIR) vers=1 path=1 } }
+> Twalk { tag=0 fid=0 newfid=0 nwname=1 wname=[ "shutdown" ] }
+< Rwalk { tag=0 nwqid=1 wqid=[ { type=(APPEND) vers=1 path=5 } ] }
+> Topen { tag=0 fid=0 mode=(MODE_WRITE) }
+< Ropen { tag=0 qid={ type=(APPEND) vers=1 path=5 } iounit=0 }
+> Twrite { tag=0 fid=0 offset=0 count=2 data="1\n" }
+< Rwrite { tag=0 count=2 }