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// Copyright 2018 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.
package poll
import (
"errors"
"internal/syscall/unix"
"syscall"
)
// Fsync invokes SYS_FCNTL with SYS_FULLFSYNC because
// on OS X, SYS_FSYNC doesn't fully flush contents to disk.
// See Issue #26650 as well as the man page for fsync on OS X.
func (fd *FD) Fsync() error {
if err := fd.incref(); err != nil {
return err
}
defer fd.decref()
return ignoringEINTR(func() error {
_, err := unix.Fcntl(fd.Sysfd, syscall.F_FULLFSYNC, 0)
// There are scenarios such as SMB mounts where fcntl will fail
// with ENOTSUP. In those cases fallback to fsync.
// See #64215
if err != nil && errors.Is(err, syscall.ENOTSUP) {
err = syscall.Fsync(fd.Sysfd)
}
return err
})
}
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