11-18-2009
Can be but shared. An exclusive IP isn't virtual, it a real interface own by the non global zone and not visible from the global one.
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LEARN ABOUT OPENSOLARIS
halockrun
halockrun(1M) System Administration Commands halockrun(1M)
NAME
halockrun - run a child program while holding a file lock
SYNOPSIS
/usr/cluster/bin/halockrun [-nsv] [-e exitcode] lockfilename
prog [args]
DESCRIPTION
The halockrun utility provides a convenient means to claim a file lock on a file and run a program while holding that lock. As this utility
supports script locking, this utility is useful when programming in scripting languages such as the Bourne shell. See sh(1).
halockrun opens the file lockfilename and claims an exclusive mode file lock on the entire file. See fcntl(2) fcntl(2)). Then it runs the
program prog with arguments args as a child process and waits for the child process to exit. When the child exits, halockrun releases the
lock, and exits with the same exit code with which the child exited.
The overall effect is that the child prog is run as a critical section, and that this critical section is well-formed, in that no matter
how the child terminates, the lock is released.
If the file lockfilename cannot be opened or created, then halockrun prints an error message on stderr and exits with exit code 99.
You can run this command in the global zone or in a non-global zone. The command affects only the global or non-global zone in which you
issue the command.
OPTIONS
The following options are supported:
-e exitcode Normally, errors detected by halockrun exit with exit code 99. The -e option provides a means to change this
special exit code to a different value.
-n The lock should be requested in non-blocking mode: if the lock cannot be granted immediately, halockrun exits
immediately, with exit code 1, without running prog. This behavior is not affected by the -e option.
Without the -n option, the lock is requested in blocking mode, thus, the halockrun utility blocks waiting for
the lock to become available.
-s Claim the file lock in shared mode, rather than in exclusive mode.
-v Verbose output, on stderr.
EXIT STATUS
Errors detected by halockrun itself, such that the child process was never started, cause halockrun to exit with exit code 99. (This exit
code value can be changed to a different value using the -e option. See OPTIONS.
Otherwise, halockrun exits with the same exit code with which the child exited.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscu |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
SEE ALSO
fcntl(2), attributes(5)
Sun Cluster 3.2 10 Apr 2006 halockrun(1M)