I'm running cygwin bash on Windows 8.1. I would like to to write a OS neutral bash script that uses the commands like lock, block and unlock.
Do I need to write lock, block and unlock myself in C++?
I'm hoping someone has already written them.
My bash script would look something like this:
It seems to me someone should have written these commands a long time ago and made them available to perl, bash, python, ruby... programmers. Can anyone tell me where to get these programs?
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?
thanks (7 Replies)
When I want to use the editor ,whether vi or textedit,it prompts for entering a key. How can I disable this function?many thanks for offering solutions! (1 Reply)
I only able to lock user ID with passwd -l username
It seems there is no option for me to unlock ID in solaris?
Is there any command as below?
passwd -u username
Appreciate someome can share with me the way to do it. (1 Reply)
When I do HMC upgrade, I download HMC code from IBM web site and burn it to a DVD disk, when I get the first DVD out of HMC's dvd rom and input the second DVD, it shows error:
The requested device is already locked by the process: Install Corrective Service.
Would you like to try to request a... (2 Replies)
We have two processes, one which copies a control file into a folder and another which is polling this folder and reading the control files.
Sometimes they clash and the reader fails because the copy is still happening.
We have been told that we should change the copy to a move because the... (1 Reply)
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.
1. How to lock the account after a few (like 3) invalid password attempts?
2. How do you lock a screen after 30... (1 Reply)
Hi all,
I have to test some user priviliges. The goal is to be sure that an unauthorized user can't restart some modules (ssh, mysql etc...).
I'm trying to automate it with a shell script but in same cases I got the syslog broadcast message.
Is there any way to simply get a return code... (3 Replies)
Requirement:First i need to unlock the directory which i had a script for it.If i select app1 it should unlock the directory and after chnages in the script once need to lock the directory with lock command
The below highlighed variables in lock and unlock has to be changed according... (2 Replies)
I use Debian default encryption disk encryption. Only /boot it's not encrypted. When I boot I need to type my password, and then I will be logged in. But now I can't login. It always says that I typed the wrong password, but I typed the correct password.
I tried to boot in live-CD and try unlock... (3 Replies)
Discussion started by: zognadal
3 Replies
LEARN ABOUT HPUX
sem_trywait
sem_wait(2) System Calls Manual sem_wait(2)NAME
sem_wait, sem_trywait - lock a POSIX semaphore
SYNOPSIS DESCRIPTION
is used to lock a semaphore. The calling thread will not return from its call to until one of the following events occur: it successfully
obtains a lock on the semaphore; it is interrupted by a signal or an error condition occurs.
is used to lock a semaphore, if it is available. The value of the semaphore sem is checked at some unspecified time during the call. If
the semaphore is available at the time its value is checked, the calling thread will atomically, with respect to the checking of the value,
lock the semaphore. The thread will now own a lock on the semaphore; the call will return successfully. If the semaphore is unavailable
at the time its value is checked, then the call returns -1 with errno set to EAGAIN.
If the specified semaphore referred to by sem is a named semaphore, then this semaphore must have been opened by the calling process with
The calling process must have both read and write permissions on the semaphore to perform these operations. The semaphore will be locked
upon successful return and will stay locked until it is explicitly released by a call to
To use this function, link in the realtime library by specifying on the compiler or linker command line.
EXAMPLES
The following call to will lock the semaphore sem.
The following call to will lock the semaphore sem, if it is available.
RETURN VALUE
A successful call to will return 0 and the calling thread will then own a lock on the semaphore. Otherwise, the call to will return -1
with errno set to the appropriate value of the error condition.
A successful call to will return 0, if the semaphore was available and the calling thread was able to lock the semaphore. Otherwise, the
call to will return -1 with errno set to the appropriate value of the error condition.
ERRORS
and fail and do not perform the requested operation if any of the following conditions are encountered:
[EPERM] The calling process does not have the privileges necessary to lock the semaphore.
[EAGAIN] The semaphore was not available and hence could not be locked by This error condition only occurs in
[EINVAL] The argument sem does not refer to a valid semaphore.
[EINTR] The function was interrupted by a signal
SEE ALSO sem_post(2), <semaphore.h>.
STANDARDS CONFORMANCE sem_wait(2)