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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:15:26 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:15:26 +0000 |
commit | 82539ad8d59729fb45b0bb0edda8f2bddb719eb1 (patch) | |
tree | 58f0b58e6f44f0e04d4a6373132cf426fa835fa7 /src/internal/poll/sendfile_bsd.go | |
parent | Initial commit. (diff) | |
download | golang-1.17-upstream.tar.xz golang-1.17-upstream.zip |
Adding upstream version 1.17.13.upstream/1.17.13upstream
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.go | 60 |
1 files changed, 60 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..3ba30a2 --- /dev/null +++ b/src/internal/poll/sendfile_bsd.go @@ -0,0 +1,60 @@ +// 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 dragonfly || freebsd +// +build 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 +} |