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procutil: ensure that procutil.std{out,err}.write() writes all bytes
Python 3 offers different kind of streams and it’s not guaranteed for all of
them that calling write() writes all bytes.
When Python is started in unbuffered mode, sys.std{out,err}.buffer are
instances of io.FileIO, whose write() can write less bytes for
platform-specific reasons (e.g. Linux has a 0x7ffff000 bytes maximum and could
write less if interrupted by a signal; when writing to Windows consoles, it’s
limited to 32767 bytes to avoid the "not enough space" error). This can lead to
silent loss of data, both when using sys.std{out,err}.buffer (which may in fact
not be a buffered stream) and when using the text streams sys.std{out,err}
(I’ve created a CPython bug report for that:
https://bugs.python.org/issue41221).
Python may fix the problem at some point. For now, we implement our own wrapper
for procutil.std{out,err} that calls the raw stream’s write() method until all
bytes have been written. We don’t use sys.std{out,err} for larger writes, so I
think it’s not worth the effort to patch them.
author | Manuel Jacob <me@manueljacob.de> |
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date | Fri, 10 Jul 2020 12:27:58 +0200 |
parents | c53a49c345e1 |
children |
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SVN-fs-dump-format-version: 2 UUID: b70c45d5-2b76-4722-a373-d9babae61626 Revision-number: 0 Prop-content-length: 260 Content-length: 260 K 8 svn:date V 27 2012-04-18T11:35:14.752409Z K 17 svn:sync-from-url V 73 file:///Users/pmezard/dev/hg/hg-pmezard/tests/svn/temp/svn-repo/trunk/dir K 18 svn:sync-from-uuid V 36 56625b9e-e7e9-45be-ab61-052d41f0e1dd K 24 svn:sync-last-merged-rev V 1 4 PROPS-END Revision-number: 1 Prop-content-length: 112 Content-length: 112 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2012-04-18T11:35:14.769622Z K 7 svn:log V 10 init projA PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Revision-number: 2 Prop-content-length: 107 Content-length: 107 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2012-04-18T11:35:15.052989Z K 7 svn:log V 6 adddir PROPS-END Node-path: trunk/dir Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/dir/a Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 12 PROPS-END a Revision-number: 3 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2012-04-18T11:35:16.050353Z K 7 svn:log V 4 addb PROPS-END Revision-number: 4 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2012-04-18T11:35:17.050768Z K 7 svn:log V 4 addc PROPS-END