asyncio sendfile sends extra data in the last chunk in fallback mode

[asvetlov]

BPO	37279
Nosy	@asvetlov, @1st1, @miss-islington
PRs	bpo-37279: Fix asyncio sendfile support when extra data are sent in fallback mode. #14075 [3.8] bpo-37279: Fix asyncio sendfile support when extra data are sent in fallback mode. (GH-14075) #14100 [3.7] bpo-37279: Fix asyncio sendfile support when extra data are sent in fallback mode. (GH-14075). #14103

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-06-15.11:25:57.774>
created_at = <Date 2019-06-14.10:25:04.760>
labels = ['3.8', 'type-bug', '3.7', '3.9', 'expert-asyncio']
title = 'asyncio sendfile sends extra data in the last chunk in fallback mode'
updated_at = <Date 2019-06-15.11:56:30.335>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2019-06-15.11:56:30.335>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2019-06-15.11:25:57.774>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2019-06-14.10:25:04.760>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 37279
keywords = ['patch']
message_count = 4.0
messages = ['345571', '345671', '345672', '345677']
nosy_count = 3.0
nosy_names = ['asvetlov', 'yselivanov', 'miss-islington']
pr_nums = ['14075', '14100', '14103']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37279'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[asvetlov]

My fault introduced in 3.7 in initial async sendfile implementation

[asvetlov]

New changeset ef21523 by Andrew Svetlov in branch 'master':
bpo-37279: Fix asyncio sendfile support when extra data are sent in fallback mode. (GH-14075)
ef21523

[miss-islington]

New changeset bb07321 by Miss Islington (bot) in branch '3.8':
bpo-37279: Fix asyncio sendfile support when extra data are sent in fallback mode. (GH-14075)
bb07321

[asvetlov]

New changeset e5d67f1 by Andrew Svetlov in branch '3.7':
[3.7] bpo-37279: Fix asyncio sendfile support when extra data are sent in fallback mode. (GH-14075). (GH-14103)
e5d67f1