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rhnLockfile.cpython-39.pyc
a U��Zc � @ s~ d dl Z d dlZd dlZd dlmZmZ d dlmZ d dlZG dd� de�Z G dd� d�Z dd � Z e d krze� e � pvd � dS ) � N)� EWOULDBLOCK�EEXIST)�bstrc @ s e Zd ZdZdS )�LockfileLockedExceptionz$thrown ONLY when pid file is locked.N)�__name__� __module__� __qualname__�__doc__� r r �3/usr/lib/python3.9/site-packages/rhn/rhnLockfile.pyr s r c @ s* e Zd ZdZd dd�Zdd� Zdd� ZdS ) �Lockfilez�class that provides simple access to a PID-style lockfile. methods: __init__(lockfile), acquire(), and release() NOTE: currently acquires upon init The *.pid file will be acquired, or an LockfileLockedException is raised. Nc C s� t j�t j�t j�|���| _|| _| js4t �� | _t j�| j�}t j� |�s�zt � |� W n6 t y� t � � d }t|d�r�|jtkr�n� Y n0 t �| jt jt jB t jB �| _| �� dS )zlcreate (if need be), and acquire lock on lockfile lockfile example: '/var/run/up2date.pid' � �errnoN)�os�path�abspath� expanduser� expandvars�lockfile�pid�getpid�dirname�exists�makedirs�OSError�sys�exc_info�hasattrr r �open�O_RDWR�O_CREAT�O_SYNC�f�acquire)�selfr r r �er r r �__init__$ s& �� zLockfile.__init__c C s� zt �| jt jt jB � W nB ty\ t�� d jt krVt d| j dt�� d ��n� Y n0 t � | jt j d� t �| jd� t �| jtt| j�d �� dS )z5acquire the lock; else raise LockfileLockedException.r zcannot acquire lock on %s.N� r � )�fcntl�flockr" ZLOCK_EXZLOCK_NB�IOErrorr r r r r r ZF_SETFDr � ftruncate�writer �strr �r$ r r r r# E s �zLockfile.acquirec C s, t �| j� t�| jtj� t �| j� d S )N)r �unlinkr r) r* r" ZLOCK_UN�closer/ r r r �releaseV s zLockfile.release)N)r r r r r& r# r2 r r r r r s !r c C sx z t d�} W n4 ty@ tj�dt�� d � t�d� Y n40 td� td� ddl}|� d � | � � td � dS ) z test codez ./test.pidz%s r ���zlock acquired z...sleeping for 10 secondsr N� zlock released ) r r r �stderrr- r �exit�print�time�sleepr2 )�Lr8 r r r �main] s r; �__main__)r r r) r r r Zrhn.i18nr � Exceptionr r r; r r6 r r r r �<module> s B
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