62 lines
2.2 KiB
Python
62 lines
2.2 KiB
Python
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#! /usr/bin/env python
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import sys
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import os
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import errno
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import tempfile
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from multiprocessing import Process
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class singleinstance:
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"""
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Implements a single instance application by creating a lock file based on the full path to the script file.
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This is based upon the singleton class from tendo https://github.com/pycontribs/tendo
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which is under the Python Software Foundation License version 2
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"""
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def __init__(self, flavor_id=""):
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import sys
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self.initialized = False
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basename = os.path.splitext(os.path.abspath(sys.argv[0]))[0].replace("/", "-").replace(":", "").replace("\\", "-") + '-%s' % flavor_id + '.lock'
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self.lockfile = os.path.normpath(tempfile.gettempdir() + '/' + basename)
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if sys.platform == 'win32':
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try:
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# file already exists, we try to remove (in case previous execution was interrupted)
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if os.path.exists(self.lockfile):
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os.unlink(self.lockfile)
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self.fd = os.open(self.lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR)
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except OSError:
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type, e, tb = sys.exc_info()
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if e.errno == 13:
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print 'Another instance of this application is already running'
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sys.exit(-1)
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print(e.errno)
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raise
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else: # non Windows
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import fcntl
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self.fp = open(self.lockfile, 'w')
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try:
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fcntl.lockf(self.fp, fcntl.LOCK_EX | fcntl.LOCK_NB)
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except IOError:
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print 'Another instance of this application is already running'
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sys.exit(-1)
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self.initialized = True
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def __del__(self):
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import sys
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if not self.initialized:
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return
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try:
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if sys.platform == 'win32':
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if hasattr(self, 'fd'):
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os.close(self.fd)
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os.unlink(self.lockfile)
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else:
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import fcntl
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fcntl.lockf(self.fp, fcntl.LOCK_UN)
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if os.path.isfile(self.lockfile):
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os.unlink(self.lockfile)
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except Exception, e:
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sys.exit(-1)
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