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klm_prot.x
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/* @(#)klm_prot.x 2.1 88/08/01 4.0 RPCSRC */ /* * Kernel/lock manager protocol definition * Copyright (c) 2010, Oracle America, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * Neither the name of the "Oracle America, Inc." nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * protocol used between the UNIX kernel (the "client") and the * local lock manager. The local lock manager is a deamon running * above the kernel. */ const LM_MAXSTRLEN = 1024; /* * lock manager status returns */ enum klm_stats { klm_granted = 0, /* lock is granted */ klm_denied = 1, /* lock is denied */ klm_denied_nolocks = 2, /* no lock entry available */ klm_working = 3 /* lock is being processed */ }; /* * lock manager lock identifier */ struct klm_lock { string server_name<LM_MAXSTRLEN>; netobj fh; /* a counted file handle */ int pid; /* holder of the lock */ unsigned l_offset; /* beginning offset of the lock */ unsigned l_len; /* byte length of the lock; * zero means through end of file */ }; /* * lock holder identifier */ struct klm_holder { bool exclusive; /* FALSE if shared lock */ int svid; /* holder of the lock (pid) */ unsigned l_offset; /* beginning offset of the lock */ unsigned l_len; /* byte length of the lock; * zero means through end of file */ }; /* * reply to KLM_LOCK / KLM_UNLOCK / KLM_CANCEL */ struct klm_stat { klm_stats stat; }; /* * reply to a KLM_TEST call */ union klm_testrply switch (klm_stats stat) { case klm_denied: struct klm_holder holder; default: /* All other cases return no arguments */ void; }; /* * arguments to KLM_LOCK */ struct klm_lockargs { bool block; bool exclusive; struct klm_lock alock; }; /* * arguments to KLM_TEST */ struct klm_testargs { bool exclusive; struct klm_lock alock; }; /* * arguments to KLM_UNLOCK */ struct klm_unlockargs { struct klm_lock alock; }; program KLM_PROG { version KLM_VERS { klm_testrply KLM_TEST (struct klm_testargs) = 1; klm_stat KLM_LOCK (struct klm_lockargs) = 2; klm_stat KLM_CANCEL (struct klm_lockargs) = 3; /* klm_granted=> the cancel request fails due to lock is already granted */ /* klm_denied=> the cancel request successfully aborts lock request */ klm_stat KLM_UNLOCK (struct klm_unlockargs) = 4; } = 1; } = 100020;