4d90a5c364
platform: Allows sysfs to implement utimesns natively This moves away from `syscall.UtimesNano` as it has intentionally avoided common features in POSIX, such as handling UTIME_NOW and UTIME_OMIT. When we eventually expose this API, users will be free to override `UTIME_NOW` with a fake clock, possibly the same that was supplied to wazero's `ModuleConfig`. Signed-off-by: Adrian Cole <adrian@tetrate.io> Co-authored-by: Edoardo Vacchi <evacchi@users.noreply.github.com>
44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
package platform
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import (
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"syscall"
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"unsafe"
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_ "unsafe" // for go:linkname
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)
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const (
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_AT_FDCWD = -0x64
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_AT_SYMLINK_NOFOLLOW = 0x100
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_UTIME_NOW = (1 << 30) - 1
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_UTIME_OMIT = (1 << 30) - 2
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SupportsSymlinkNoFollow = true
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)
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func utimens(path string, times *[2]syscall.Timespec, symlinkFollow bool) (err error) {
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var flags int
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if !symlinkFollow {
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flags = _AT_SYMLINK_NOFOLLOW
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}
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var _p0 *byte
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_p0, err = syscall.BytePtrFromString(path)
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if err != nil {
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return
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}
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return utimensat(_AT_FDCWD, uintptr(unsafe.Pointer(_p0)), times, flags)
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}
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// On linux, implement futimens via utimensat with the NUL path.
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func futimens(fd uintptr, times *[2]syscall.Timespec) error {
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return utimensat(int(fd), 0 /* NUL */, times, 0)
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}
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// utimensat is like syscall.utimensat special-cased to accept a NUL string for the path value.
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func utimensat(dirfd int, strPtr uintptr, times *[2]syscall.Timespec, flags int) (err error) {
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_, _, e1 := syscall.Syscall6(syscall.SYS_UTIMENSAT, uintptr(dirfd), strPtr, uintptr(unsafe.Pointer(times)), uintptr(flags), 0, 0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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