163 lines
4.7 KiB
Python
163 lines
4.7 KiB
Python
#!python
|
|
|
|
#----------------------------------------------------------------------
|
|
# test largefile support on system where this makes sense
|
|
#
|
|
#----------------------------------------------------------------------
|
|
|
|
import test_support
|
|
import os, struct, stat, sys
|
|
|
|
try:
|
|
import signal
|
|
# The default handler for SIGXFSZ is to abort the process.
|
|
# By ignoring it, system calls exceeding the file size resource
|
|
# limit will raise IOError instead of crashing the interpreter.
|
|
oldhandler = signal.signal(signal.SIGXFSZ, signal.SIG_IGN)
|
|
except (ImportError, AttributeError):
|
|
pass
|
|
|
|
|
|
# create >2GB file (2GB = 2147483648 bytes)
|
|
size = 2500000000L
|
|
name = test_support.TESTFN
|
|
|
|
|
|
# On Windows this test comsumes large resources; It takes a long time to build
|
|
# the >2GB file and takes >2GB of disk space therefore the resource must be
|
|
# enabled to run this test. If not, nothing after this line stanza will be
|
|
# executed.
|
|
if sys.platform[:3] == 'win':
|
|
test_support.requires(
|
|
'largefile',
|
|
'test requires %s bytes and a long time to run' % str(size))
|
|
else:
|
|
# Only run if the current filesystem supports large files.
|
|
# (Skip this test on Windows, since we now always support large files.)
|
|
f = open(test_support.TESTFN, 'wb')
|
|
try:
|
|
# 2**31 == 2147483648
|
|
f.seek(2147483649L)
|
|
# Seeking is not enough of a test: you must write and flush, too!
|
|
f.write("x")
|
|
f.flush()
|
|
except (IOError, OverflowError):
|
|
f.close()
|
|
os.unlink(test_support.TESTFN)
|
|
raise test_support.TestSkipped, \
|
|
"filesystem does not have largefile support"
|
|
else:
|
|
f.close()
|
|
|
|
|
|
def expect(got_this, expect_this):
|
|
if test_support.verbose:
|
|
print '%r =?= %r ...' % (got_this, expect_this),
|
|
if got_this != expect_this:
|
|
if test_support.verbose:
|
|
print 'no'
|
|
raise test_support.TestFailed, 'got %r, but expected %r' %\
|
|
(got_this, expect_this)
|
|
else:
|
|
if test_support.verbose:
|
|
print 'yes'
|
|
|
|
|
|
# test that each file function works as expected for a large (i.e. >2GB, do
|
|
# we have to check >4GB) files
|
|
|
|
if test_support.verbose:
|
|
print 'create large file via seek (may be sparse file) ...'
|
|
f = open(name, 'wb')
|
|
f.write('z')
|
|
f.seek(0)
|
|
f.seek(size)
|
|
f.write('a')
|
|
f.flush()
|
|
if test_support.verbose:
|
|
print 'check file size with os.fstat'
|
|
expect(os.fstat(f.fileno())[stat.ST_SIZE], size+1)
|
|
f.close()
|
|
if test_support.verbose:
|
|
print 'check file size with os.stat'
|
|
expect(os.stat(name)[stat.ST_SIZE], size+1)
|
|
|
|
if test_support.verbose:
|
|
print 'play around with seek() and read() with the built largefile'
|
|
f = open(name, 'rb')
|
|
expect(f.tell(), 0)
|
|
expect(f.read(1), 'z')
|
|
expect(f.tell(), 1)
|
|
f.seek(0)
|
|
expect(f.tell(), 0)
|
|
f.seek(0, 0)
|
|
expect(f.tell(), 0)
|
|
f.seek(42)
|
|
expect(f.tell(), 42)
|
|
f.seek(42, 0)
|
|
expect(f.tell(), 42)
|
|
f.seek(42, 1)
|
|
expect(f.tell(), 84)
|
|
f.seek(0, 1)
|
|
expect(f.tell(), 84)
|
|
f.seek(0, 2) # seek from the end
|
|
expect(f.tell(), size + 1 + 0)
|
|
f.seek(-10, 2)
|
|
expect(f.tell(), size + 1 - 10)
|
|
f.seek(-size-1, 2)
|
|
expect(f.tell(), 0)
|
|
f.seek(size)
|
|
expect(f.tell(), size)
|
|
expect(f.read(1), 'a') # the 'a' that was written at the end of the file above
|
|
f.seek(-size-1, 1)
|
|
expect(f.read(1), 'z')
|
|
expect(f.tell(), 1)
|
|
f.close()
|
|
|
|
if test_support.verbose:
|
|
print 'play around with os.lseek() with the built largefile'
|
|
f = open(name, 'rb')
|
|
expect(os.lseek(f.fileno(), 0, 0), 0)
|
|
expect(os.lseek(f.fileno(), 42, 0), 42)
|
|
expect(os.lseek(f.fileno(), 42, 1), 84)
|
|
expect(os.lseek(f.fileno(), 0, 1), 84)
|
|
expect(os.lseek(f.fileno(), 0, 2), size+1+0)
|
|
expect(os.lseek(f.fileno(), -10, 2), size+1-10)
|
|
expect(os.lseek(f.fileno(), -size-1, 2), 0)
|
|
expect(os.lseek(f.fileno(), size, 0), size)
|
|
expect(f.read(1), 'a') # the 'a' that was written at the end of the file above
|
|
f.close()
|
|
|
|
if hasattr(f, 'truncate'):
|
|
if test_support.verbose:
|
|
print 'try truncate'
|
|
f = open(name, 'r+b')
|
|
f.seek(0, 2)
|
|
expect(f.tell(), size+1) # else we've lost track of the true size
|
|
# Cut it back via seek + truncate with no argument.
|
|
newsize = size - 10
|
|
f.seek(newsize)
|
|
f.truncate()
|
|
expect(f.tell(), newsize) # else pointer moved
|
|
f.seek(0, 2)
|
|
expect(f.tell(), newsize) # else wasn't truncated
|
|
# Ensure that truncate(smaller than true size) shrinks the file.
|
|
newsize -= 1
|
|
f.seek(42)
|
|
f.truncate(newsize)
|
|
expect(f.tell(), 42) # else pointer moved
|
|
f.seek(0, 2)
|
|
expect(f.tell(), newsize) # else wasn't truncated
|
|
|
|
# XXX truncate(larger than true size) is ill-defined across platforms
|
|
|
|
# cut it waaaaay back
|
|
f.seek(0)
|
|
f.truncate(1)
|
|
expect(f.tell(), 0) # else pointer moved
|
|
expect(len(f.read()), 1) # else wasn't truncated
|
|
|
|
f.close()
|
|
|
|
os.unlink(name)
|