diff --git a/Doc/library/shutil.rst b/Doc/library/shutil.rst
index 220207e5f3cbbf..e623c3df7beba6 100644
--- a/Doc/library/shutil.rst
+++ b/Doc/library/shutil.rst
@@ -517,7 +517,7 @@ the use of userspace buffers in Python as in "``outfd.write(infd.read())``".
On macOS `fcopyfile`_ is used to copy the file content (not metadata).
-On Linux :func:`os.sendfile` is used.
+On Linux and Solaris :func:`os.sendfile` is used.
On Windows :func:`shutil.copyfile` uses a bigger default buffer size (1 MiB
instead of 64 KiB) and a :func:`memoryview`-based variant of
@@ -529,6 +529,9 @@ file then shutil will silently fallback on using less efficient
.. versionchanged:: 3.8
+.. versionchanged:: 3.14
+ Solaris now uses :func:`os.sendfile`.
+
.. _shutil-copytree-example:
copytree example
diff --git a/Lib/shutil.py b/Lib/shutil.py
index 6037092a5e09f2..89c12b76b61dfc 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -48,7 +48,7 @@
# This should never be removed, see rationale in:
# https://bugs.python.org/issue43743#msg393429
_USE_CP_SENDFILE = (hasattr(os, "sendfile")
- and sys.platform.startswith(("linux", "android")))
+ and sys.platform.startswith(("linux", "android", "solaris")))
_HAS_FCOPYFILE = posix and hasattr(posix, "_fcopyfile") # macOS
# CMD defaults in Windows 10
@@ -110,7 +110,7 @@ def _fastcopy_fcopyfile(fsrc, fdst, flags):
def _fastcopy_sendfile(fsrc, fdst):
"""Copy data from one regular mmap-like fd to another by using
high-performance sendfile(2) syscall.
- This should work on Linux >= 2.6.33 only.
+ This should work on Linux >= 2.6.33, Android and Solaris.
"""
# Note: copyfileobj() is left alone in order to not introduce any
# unexpected breakage. Possible risks by using zero-copy calls
@@ -265,7 +265,7 @@ def copyfile(src, dst, *, follow_symlinks=True):
return dst
except _GiveupOnFastCopy:
pass
- # Linux
+ # Linux / Android / Solaris
elif _USE_CP_SENDFILE:
try:
_fastcopy_sendfile(fsrc, fdst)
diff --git a/Misc/NEWS.d/next/Library/2020-12-22-18-08-12.bpo-41843.q9Nh2r.rst b/Misc/NEWS.d/next/Library/2020-12-22-18-08-12.bpo-41843.q9Nh2r.rst
new file mode 100644
index 00000000000000..4e525f7ed6a757
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-12-22-18-08-12.bpo-41843.q9Nh2r.rst
@@ -0,0 +1,2 @@
+Solaris now uses :func:`os.sendfile` fast-copy syscall for more efficient
+:mod:`shutil` file copy related functions.
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