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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 19:23:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 19:23:18 +0000
commit43a123c1ae6613b3efeed291fa552ecd909d3acf (patch)
treefd92518b7024bc74031f78a1cf9e454b65e73665 /src/internal/poll/sendfile_bsd.go
parentInitial commit. (diff)
downloadgolang-1.20-upstream.tar.xz
golang-1.20-upstream.zip
Adding upstream version 1.20.14.upstream/1.20.14upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/internal/poll/sendfile_bsd.go')
-rw-r--r--src/internal/poll/sendfile_bsd.go59
1 files changed, 59 insertions, 0 deletions
diff --git a/src/internal/poll/sendfile_bsd.go b/src/internal/poll/sendfile_bsd.go
new file mode 100644
index 0000000..89315a8
--- /dev/null
+++ b/src/internal/poll/sendfile_bsd.go
@@ -0,0 +1,59 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || dragonfly || freebsd
+
+package poll
+
+import "syscall"
+
+// maxSendfileSize is the largest chunk size we ask the kernel to copy
+// at a time.
+const maxSendfileSize int = 4 << 20
+
+// SendFile wraps the sendfile system call.
+func SendFile(dstFD *FD, src int, pos, remain int64) (int64, error) {
+ if err := dstFD.writeLock(); err != nil {
+ return 0, err
+ }
+ defer dstFD.writeUnlock()
+ if err := dstFD.pd.prepareWrite(dstFD.isFile); err != nil {
+ return 0, err
+ }
+
+ dst := dstFD.Sysfd
+ var written int64
+ var err error
+ for remain > 0 {
+ n := maxSendfileSize
+ if int64(n) > remain {
+ n = int(remain)
+ }
+ pos1 := pos
+ n, err1 := syscall.Sendfile(dst, src, &pos1, n)
+ if n > 0 {
+ pos += int64(n)
+ written += int64(n)
+ remain -= int64(n)
+ } else if n == 0 && err1 == nil {
+ break
+ }
+ if err1 == syscall.EINTR {
+ continue
+ }
+ if err1 == syscall.EAGAIN {
+ if err1 = dstFD.pd.waitWrite(dstFD.isFile); err1 == nil {
+ continue
+ }
+ }
+ if err1 != nil {
+ // This includes syscall.ENOSYS (no kernel
+ // support) and syscall.EINVAL (fd types which
+ // don't implement sendfile)
+ err = err1
+ break
+ }
+ }
+ return written, err
+}