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33 * Kernel/lock manager protocol definition
34 * Copyright (C) 1986 Sun Microsystems, Inc.
36 * protocol used between the UNIX kernel (the "client") and the
37 * local lock manager. The local lock manager is a daemon running
41 const LM_MAXSTRLEN = 1024;
44 * lock manager status returns
47 klm_granted = 0, /* lock is granted */
48 klm_denied = 1, /* lock is denied */
49 klm_denied_nolocks = 2, /* no lock entry available */
50 klm_working = 3 /* lock is being processed */
54 * lock manager lock identifier
57 string server_name<LM_MAXSTRLEN>;
58 netobj fh; /* a counted file handle */
59 int pid; /* holder of the lock */
60 unsigned l_offset; /* beginning offset of the lock */
61 unsigned l_len; /* byte length of the lock;
62 * zero means through end of file */
66 * lock holder identifier
69 bool exclusive; /* FALSE if shared lock */
70 int svid; /* holder of the lock (pid) */
71 unsigned l_offset; /* beginning offset of the lock */
72 unsigned l_len; /* byte length of the lock;
73 * zero means through end of file */
77 * reply to KLM_LOCK / KLM_UNLOCK / KLM_CANCEL
84 * reply to a KLM_TEST call
86 union klm_testrply switch (klm_stats stat) {
88 struct klm_holder holder;
89 default: /* All other cases return no arguments */
95 * arguments to KLM_LOCK
100 struct klm_lock alock;
104 * arguments to KLM_TEST
106 struct klm_testargs {
108 struct klm_lock alock;
112 * arguments to KLM_UNLOCK
114 struct klm_unlockargs {
115 struct klm_lock alock;
121 klm_testrply KLM_TEST (struct klm_testargs) = 1;
123 klm_stat KLM_LOCK (struct klm_lockargs) = 2;
125 klm_stat KLM_CANCEL (struct klm_lockargs) = 3;
126 /* klm_granted=> the cancel request fails due to lock is already granted */
127 /* klm_denied=> the cancel request successfully aborts
130 klm_stat KLM_UNLOCK (struct klm_unlockargs) = 4;