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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 | 2616325766e3 |
children |
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# # tcsh completion for Mercurial # # This file has been auto-generated by tcsh_completion_build.sh for # Mercurial Distributed SCM (version 1.7.5+157-8a220ae0b2ba) # # Copyright (C) 2005 TK Soh. # # This is free software; you can redistribute it and/or modify it under # the terms of the GNU General Public License as published by the Free # Software Foundation; either version 2 of the License, or (at your # option) any later version. # complete hg \ 'n/--cwd/d/' 'n/-R/d/' 'n/--repository/d/' \ 'C/-/( -R --repository \ --cwd \ -y --noninteractive \ -q --quiet \ -v --verbose \ --config \ --debug \ --debugger \ --encoding \ --encodingmode \ --traceback \ --time \ --profile \ --version \ -h --help)/' \ 'p/1/(add addremove annotate blame archive \ backout bisect bookmarks branch branches \ bundle cat clone commit ci \ copy cp debugancestor debugbuilddag debugcheckstate \ debugcommands debugcomplete debugdag debugdata debugdate \ debugfsinfo debugignore debugindex debugindexdot debuginstall \ debugpushkey debugrebuildstate debugrename debugrevspec debugsetparents \ debugstate debugsub debugwalk diff export \ forget grep heads help identify \ id import patch incoming in \ init locate log history manifest \ merge outgoing out parents paths \ pull push recover remove rm \ rename move mv resolve revert \ rollback root serve showconfig debugconfig \ status st summary sum tag \ tags tip unbundle update up \ checkout co verify version)/'