Mercurial > hg
view mercurial/helptext/hgignore.5.txt @ 45095:8e04607023e5
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 | 0ab651b5f77c |
| children | ed43b6fa847e |
line wrap: on
line source
========== hgignore ========== --------------------------------- syntax for Mercurial ignore files --------------------------------- :Author: Vadim Gelfer <vadim.gelfer@gmail.com> :Organization: Mercurial :Manual section: 5 :Manual group: Mercurial Manual .. include:: hgignore.5.gendoc.txt Author ====== Vadim Gelfer <vadim.gelfer@gmail.com> Mercurial was written by Matt Mackall <mpm@selenic.com>. See Also ======== |hg(1)|_, |hgrc(5)|_ Copying ======= This manual page is copyright 2006 Vadim Gelfer. Mercurial is copyright 2005-2020 Matt Mackall. Free use of this software is granted under the terms of the GNU General Public License version 2 or any later version. .. include:: common.txt