github.com/tetratelabs/wazero@v1.7.3-0.20240513003603-48f702e154b5/internal/sysfs/futimens_windows.go (about)

     1  package sysfs
     2  
     3  import (
     4  	"syscall"
     5  
     6  	"github.com/tetratelabs/wazero/experimental/sys"
     7  )
     8  
     9  func utimens(path string, atim, mtim int64) sys.Errno {
    10  	return chtimes(path, atim, mtim)
    11  }
    12  
    13  func futimens(fd uintptr, atim, mtim int64) error {
    14  	// Per docs, zero isn't a valid timestamp as it cannot be differentiated
    15  	// from nil. In both cases, it is a marker like sys.UTIME_OMIT.
    16  	// See https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-setfiletime
    17  	a, w := timespecToFiletime(atim, mtim)
    18  
    19  	if a == nil && w == nil {
    20  		return nil // both omitted, so nothing to change
    21  	}
    22  
    23  	// Attempt to get the stat by handle, which works for normal files
    24  	h := syscall.Handle(fd)
    25  
    26  	// Note: This returns ERROR_ACCESS_DENIED when the input is a directory.
    27  	return syscall.SetFileTime(h, nil, a, w)
    28  }
    29  
    30  func timespecToFiletime(atim, mtim int64) (a, w *syscall.Filetime) {
    31  	a = timespecToFileTime(atim)
    32  	w = timespecToFileTime(mtim)
    33  	return
    34  }
    35  
    36  func timespecToFileTime(tim int64) *syscall.Filetime {
    37  	if tim == sys.UTIME_OMIT {
    38  		return nil
    39  	}
    40  	ft := syscall.NsecToFiletime(tim)
    41  	return &ft
    42  }