| // 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 | |
| }) | |
| } | |