mirror of
https://github.com/ceph/ceph
synced 2024-12-21 10:54:42 +00:00
88 lines
2.0 KiB
Python
Executable File
88 lines
2.0 KiB
Python
Executable File
#!/usr/bin/python
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import errno
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import fcntl
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import signal
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import struct
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"""
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introduced by Linux 3.15
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"""
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fcntl.F_OFD_GETLK = 36
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fcntl.F_OFD_SETLK = 37
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fcntl.F_OFD_SETLKW = 38
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def handler(signum, frame):
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pass
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def main():
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f1 = open("testfile", 'w')
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f2 = open("testfile", 'w')
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fcntl.flock(f1, fcntl.LOCK_SH | fcntl.LOCK_NB)
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"""
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is flock interruptable?
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"""
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signal.signal(signal.SIGALRM, handler)
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signal.alarm(5)
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try:
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fcntl.flock(f2, fcntl.LOCK_EX)
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except IOError as e:
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if e.errno != errno.EINTR:
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raise
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else:
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raise RuntimeError("expect flock to block")
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fcntl.flock(f1, fcntl.LOCK_UN)
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lockdata = struct.pack('hhllhh', fcntl.F_WRLCK, 0, 0, 10, 0, 0)
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try:
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fcntl.fcntl(f1, fcntl.F_OFD_SETLK, lockdata)
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except IOError as e:
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if e.errno != errno.EINVAL:
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raise
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else:
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print('kernel does not support fcntl.F_OFD_SETLK')
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return
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lockdata = struct.pack('hhllhh', fcntl.F_WRLCK, 0, 10, 10, 0, 0)
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fcntl.fcntl(f2, fcntl.F_OFD_SETLK, lockdata)
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"""
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is poxis lock interruptable?
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"""
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signal.signal(signal.SIGALRM, handler)
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signal.alarm(5)
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try:
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lockdata = struct.pack('hhllhh', fcntl.F_WRLCK, 0, 0, 0, 0, 0)
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fcntl.fcntl(f2, fcntl.F_OFD_SETLKW, lockdata)
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except IOError as e:
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if e.errno != errno.EINTR:
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raise
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else:
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raise RuntimeError("expect posix lock to block")
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"""
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file handler 2 should still hold lock on 10~10
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"""
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try:
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lockdata = struct.pack('hhllhh', fcntl.F_WRLCK, 0, 10, 10, 0, 0)
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fcntl.fcntl(f1, fcntl.F_OFD_SETLK, lockdata)
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except IOError as e:
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if e.errno == errno.EAGAIN:
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pass
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else:
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raise RuntimeError("expect file handler 2 to hold lock on 10~10")
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lockdata = struct.pack('hhllhh', fcntl.F_UNLCK, 0, 0, 0, 0, 0)
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fcntl.fcntl(f1, fcntl.F_OFD_SETLK, lockdata)
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fcntl.fcntl(f2, fcntl.F_OFD_SETLK, lockdata)
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print('ok')
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main()
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