73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
package sysfs
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import (
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"syscall"
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"time"
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"github.com/tetratelabs/wazero/internal/platform"
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)
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// Define values even if not used except as sentinels.
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const (
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_UTIME_NOW = -1
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_UTIME_OMIT = -2
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SupportsSymlinkNoFollow = false
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)
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func utimens(path string, times *[2]syscall.Timespec, symlinkFollow bool) error {
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return utimensPortable(path, times, symlinkFollow)
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}
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func futimens(fd uintptr, times *[2]syscall.Timespec) error {
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// Before Go 1.20, ERROR_INVALID_HANDLE was returned for too many reasons.
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// Kick out so that callers can use path-based operations instead.
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if !platform.IsAtLeastGo120 {
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return syscall.ENOSYS
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}
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// Per docs, zero isn't a valid timestamp as it cannot be differentiated
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// from nil. In both cases, it is a marker like syscall.UTIME_OMIT.
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// See https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-setfiletime
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a, w := timespecToFiletime(times)
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if a == nil && w == nil {
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return nil // both omitted, so nothing to change
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}
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// Attempt to get the stat by handle, which works for normal files
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h := syscall.Handle(fd)
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// Note: This returns ERROR_ACCESS_DENIED when the input is a directory.
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return syscall.SetFileTime(h, nil, a, w)
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}
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func timespecToFiletime(times *[2]syscall.Timespec) (a, w *syscall.Filetime) {
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// Handle when both inputs are current system time.
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if times == nil || times[0].Nsec == UTIME_NOW && times[1].Nsec == UTIME_NOW {
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now := time.Now().UnixNano()
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ft := syscall.NsecToFiletime(now)
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return &ft, &ft
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}
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// Now, either one of the inputs is current time, or neither. This
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// means we don't have a risk of re-reading the clock.
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a = timespecToFileTime(times, 0)
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w = timespecToFileTime(times, 1)
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return
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}
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func timespecToFileTime(times *[2]syscall.Timespec, i int) *syscall.Filetime {
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if times[i].Nsec == UTIME_OMIT {
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return nil
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}
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var nsec int64
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if times[i].Nsec == UTIME_NOW {
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nsec = time.Now().UnixNano()
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} else {
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nsec = syscall.TimespecToNsec(times[i])
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}
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ft := syscall.NsecToFiletime(nsec)
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return &ft
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}
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