05-05-2005
Anything in the lock file? or is it an empty file? Can you tell if the 8c001 is specific to a printer (doe the same printer always produce the lock file with the same name?)
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We wish to keep a sequence number in a file. When someone wants to get the next sequence number we need to lock the file, get the next number and increment it by one. How do you do that?
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I found a lock file like this
lrwxrwxr-x 1 sskb apollo 16 Oct 22 22:00 lock -> hostname:2747
(pl. note that hostname is a number like 123.4.5.6)
but this was not shown in the file manager eventhough I had selected to show the hidden files.
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how can I lock my keyboard while I'm away from the computer without using lock command. What other commands gives me the option to lock keyboard device?
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4. Red Hat
Hi,
I want to lock the file in linux and the file cannot be edit or modify by other .I know in perl, there is function flock , but it is not worked.
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5. UNIX for Advanced & Expert Users
I have an Essbase installation on Solaris 10 and need to get the backups configured. Unfortunately several key files are locked and Essbase (OLAP application) is not releasing the locks when the Essbase or the applications within stop running. It appears I can use chmod to unlock the files but I... (0 Replies)
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Hello all,
If anyone has time, I have a few questions:
How do I do the following in Linux. We are using Red Hat and Oracle Enterprise Linux, which is based on Red Hat too.
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Hi,
I am trying to create a lock file with the following code but for some reason after file is created it has
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9. Shell Programming and Scripting
Hi,
Please let me know how these steps are creating a lock file using echo " ".
LOCK_FILE=${LOG_DIR}/${DBNAME}_MD.lock
# create lock file
if
then
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LEARN ABOUT OPENSOLARIS
plock
plock(3C) Standard C Library Functions plock(3C)
NAME
plock - lock or unlock into memory process, text, or data
SYNOPSIS
#include <sys/lock.h>
int plock(int op);
DESCRIPTION
The plock() function allows the calling process to lock or unlock into memory its text segment (text lock), its data segment (data lock),
or both its text and data segments (process lock). Locked segments are immune to all routine swapping. The effective user ID of the calling
process must be super-user to use this call.
The plock() function performs the function specified by op:
PROCLOCK Lock text and data segments into memory (process lock).
TXTLOCK Lock text segment into memory (text lock).
DATLOCK Lock data segment into memory (data lock).
UNLOCK Remove locks.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
The plock() function fails and does not perform the requested operation if:
EAGAIN Not enough memory.
EINVAL The op argument is equal to PROCLOCK and a process lock, a text lock, or a data lock already exists on the calling process; the
op argument is equal to TXTLOCK and a text lock or a process lock already exists on the calling process; the op argument is equal
to DATLOCK and a data lock or a process lock already exists on the calling process; or the op argument is equal to UNLOCK and no
lock exists on the calling process.
EPERM The {PRIV_PROC_LOCK_MEMORY} privilege is not asserted in the effective set of the calling process.
USAGE
The mlock(3C) and mlockall(3C) functions are the preferred interfaces for process locking.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
exec(2), exit(2), fork(2), memcntl(2), mlock(3C), mlockall(3C), attributes(5)
SunOS 5.11 22 Mar 2004 plock(3C)