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lseek(5, 147, SEEK_SET) = 147
gettimeofday({1255627303, 624276}, NULL) = 0
...
flock(3, LOCK_UN)                       = 0
write(5, "cl  "..., 4)                   = 4
lseek(5, 0, SEEK_CUR)                = 1020

lseek(5, 147, SEEK_SET) = 147
flock(5, LOCK_EX)                 = 0
lseek(5, 0, SEEK_CUR)                       = 808
write(5, "cl  "..., 4)                   = 4
lseek(5, 0, SEEK_CUR)                = 1020

# Example:
$self->_sysseek(147);
...

    flock($fh, LOCK_UN) or die "unable to unlock file";
}