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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> |
---|---|
date | Fri, 10 Jul 2020 12:27:58 +0200 |
parents | bdd2e18b54c5 |
children |
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{ // Enforcing "eqeqeq" : true, // true: Require triple equals (===) for comparison "forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty() "freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc. "nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters. "undef" : true, // true: Require all non-global variables to be declared (prevents global leaks) // Environments "browser" : true // Web Browser (window, document, etc) }