56697c4264
ZED uses an advisory lock on its state file to protect against multiple instances running concurrently. However, work is planned to move this state information into the kernel, and ZED will still need to protect against starting multiple instances. This commit adds an advisory lock on the PID file to protect against starting multiple instances. A lock failure can be overridden with the "-f" (force) command-line option. The advisory lock on the state file is being retained for as long as the state information is stored in the state file. Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2756
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license from the top-level
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* OPENSOLARIS.LICENSE or <http://opensource.org/licenses/CDDL-1.0>.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each file
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* and include the License file from the top-level OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Developed at Lawrence Livermore National Laboratory (LLNL-CODE-403049).
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* Copyright (C) 2013-2014 Lawrence Livermore National Security, LLC.
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*/
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#ifndef ZED_CONF_H
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#define ZED_CONF_H
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#include <libzfs.h>
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#include <stdint.h>
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#include "zed_strings.h"
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struct zed_conf {
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unsigned do_force:1; /* true if force enabled */
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unsigned do_foreground:1; /* true if run in foreground */
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unsigned do_memlock:1; /* true if locking memory */
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unsigned do_verbose:1; /* true if verbosity enabled */
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unsigned do_zero:1; /* true if zeroing state */
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int syslog_facility; /* syslog facility value */
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int min_events; /* RESERVED FOR FUTURE USE */
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int max_events; /* RESERVED FOR FUTURE USE */
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char *conf_file; /* abs path to config file */
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char *pid_file; /* abs path to pid file */
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int pid_fd; /* fd to pid file for lock */
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char *zedlet_dir; /* abs path to zedlet dir */
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zed_strings_t *zedlets; /* names of enabled zedlets */
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char *state_file; /* abs path to state file */
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int state_fd; /* fd to state file */
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libzfs_handle_t *zfs_hdl; /* handle to libzfs */
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int zevent_fd; /* fd for access to zevents */
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};
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struct zed_conf *zed_conf_create(void);
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void zed_conf_destroy(struct zed_conf *zcp);
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void zed_conf_parse_opts(struct zed_conf *zcp, int argc, char **argv);
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void zed_conf_parse_file(struct zed_conf *zcp);
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int zed_conf_scan_dir(struct zed_conf *zcp);
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int zed_conf_write_pid(struct zed_conf *zcp);
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int zed_conf_open_state(struct zed_conf *zcp);
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int zed_conf_read_state(struct zed_conf *zcp, uint64_t *eidp, int64_t etime[]);
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int zed_conf_write_state(struct zed_conf *zcp, uint64_t eid, int64_t etime[]);
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#endif /* !ZED_CONF_H */
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