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Issue #22054: Add os.get_blocking() and os.set_blocking() functions to get and

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set the blocking mode of a file descriptor (False if the O_NONBLOCK flag is
set, True otherwise). These functions are not available on Windows.
This commit is contained in:
Victor Stinner 2014-07-29 22:32:47 +02:00
parent 6aa4269ed2
commit 1db9e7bb19
13 changed files with 198 additions and 58 deletions
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23
Lib/test/test_pty.py
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@ -1,7 +1,6 @@
from test.support import verbose, run_unittest, import_module, reap_children
#Skip these tests if either fcntl or termios is not available
fcntl = import_module('fcntl')
# Skip these tests if termios is not available
import_module('termios')
import errno
@ -84,16 +83,18 @@ class PtyTest(unittest.TestCase):
# in master_open(), we need to read the EOF.
# Ensure the fd is non-blocking in case there's nothing to read.
orig_flags = fcntl.fcntl(master_fd, fcntl.F_GETFL)
fcntl.fcntl(master_fd, fcntl.F_SETFL, orig_flags | os.O_NONBLOCK)
blocking = os.get_blocking(master_fd)
try:
s1 = os.read(master_fd, 1024)
self.assertEqual(b'', s1)
except OSError as e:
if e.errno != errno.EAGAIN:
raise
# Restore the original flags.
fcntl.fcntl(master_fd, fcntl.F_SETFL, orig_flags)
os.set_blocking(master_fd, False)
try:
s1 = os.read(master_fd, 1024)
self.assertEqual(b'', s1)
except OSError as e:
if e.errno != errno.EAGAIN:
raise
finally:
# Restore the original flags.
os.set_blocking(master_fd, blocking)
debug("Writing to slave_fd")
os.write(slave_fd, TEST_STRING_1)