test_makedev fails on DragonFly BSD

[serhiy-storchaka]

Bug report

test_os.test_posix.PosixTester.test_makedev fails on DragonFly BSD:

FAIL: test_makedev (test.test_os.test_posix.PosixTester.test_makedev)
    self.assertEqual(posix.major(NODEV), NODEV)
AssertionError: 255 != 4294967295

major() and minor() have no special case for NODEV there, they just extract bit fields:

#define	major(x)	((int)(((u_int)(x) >> 8)&0xff)) /* major number */
#define	minor(x)	((int)((x)&0xffff00ff))         /* minor number */

>>> os.NODEV, os.major(os.NODEV), os.minor(os.NODEV), os.makedev(os.NODEV, os.NODEV)
(4294967295, 255, 4294902015, 4294967295)

DragonFly BSD was added to the list of platforms preserving NODEV in gh-138712, but it does not preserve it, so it should be removed from the list.

Linked PRs

• gh-154443: Fix test_makedev on DragonFly BSD #154444
• [3.15] gh-154443: Fix test_makedev on DragonFly BSD (GH-154444) #154450