fd_fsync_darwin.go

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package poll
     6  
     7  import (
     8  	"errors"
     9  	"internal/syscall/unix"
    10  	"syscall"
    11  )
    12  
    13  // Fsync invokes SYS_FCNTL with SYS_FULLFSYNC because
    14  // on OS X, SYS_FSYNC doesn't fully flush contents to disk.
    15  // See Issue #26650 as well as the man page for fsync on OS X.
    16  func (fd *FD) Fsync() error {
    17  	if err := fd.incref(); err != nil {
    18  		return err
    19  	}
    20  	defer fd.decref()
    21  	return ignoringEINTR(func() error {
    22  		_, err := unix.Fcntl(fd.Sysfd, syscall.F_FULLFSYNC, 0)
    23  
    24  		// There are scenarios such as SMB mounts where fcntl will fail
    25  		// with ENOTSUP. In those cases fallback to fsync.
    26  		// See #64215
    27  		if err != nil && errors.Is(err, syscall.ENOTSUP) {
    28  			err = syscall.Fsync(fd.Sysfd)
    29  		}
    30  		return err
    31  	})
    32  }
    33
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