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Obtain advisory lock on ZED PID file

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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
This commit is contained in:
Chris Dunlap
2014-10-01 14:56:07 -07:00
committed by Brian Behlendorf
parent 057485504e
commit 56697c4264
3 changed files with 78 additions and 33 deletions
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cmd/zed/zed.c
+2 -1
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@@ -259,7 +259,8 @@ main(int argc, char *argv[])
if (zcp->do_memlock)
_lock_memory();
(void) zed_conf_write_pid(zcp);
if ((zed_conf_write_pid(zcp) < 0) && (!zcp->do_force))
exit(EXIT_FAILURE);
if (!zcp->do_foreground)
_finish_daemonize();