Mercurial > public > mercurial-scm > hg-stable

diff mercurial/util.py @ 51649:ba205f944cb4 stable

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
mmap: add a `is_mmap_safe` method to vfs This will be useful to safeguard mmap usage to void SIGBUS when repositories lives on a NFS drive.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 03 Jul 2024 12:22:48 +0200
parents 59f846fbc11d
children 522b4d729e89
line wrap: on
line diff
--- a/mercurial/util.py	Mon Jun 24 13:14:05 2024 +0200
+++ b/mercurial/util.py	Wed Jul 03 12:22:48 2024 +0200
@@ -441,6 +441,13 @@
 
 
 def mmapread(fp, size=None):
+    """Read a file content using mmap
+
+    The responsability of checking the file system is mmap safe is the
+    responsability of the caller.
+
+    In some case, a normal string might be returned.
+    """
     if size == 0:
         # size of 0 to mmap.mmap() means "all data"
         # rather than "zero bytes", so special case that.