4e238280bc
attempt to remove glide from integration glide trim Revert "attempt to remove glide from integration" This reverts commit c5b42b6cdebb44e730080a0cf20a871c11ef095b.
99 lines
2.8 KiB
Go
99 lines
2.8 KiB
Go
package system
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import (
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"syscall"
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"unsafe"
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)
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var _zero uintptr
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// Returns the size of xattrs and nil error
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// Requires path, takes allocated []byte or nil as last argument
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func Llistxattr(path string, dest []byte) (size int, err error) {
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pathBytes, err := syscall.BytePtrFromString(path)
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if err != nil {
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return -1, err
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}
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var newpathBytes unsafe.Pointer
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if len(dest) > 0 {
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newpathBytes = unsafe.Pointer(&dest[0])
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} else {
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newpathBytes = unsafe.Pointer(&_zero)
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}
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_size, _, errno := syscall.Syscall6(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(newpathBytes), uintptr(len(dest)), 0, 0, 0)
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size = int(_size)
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if errno != 0 {
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return -1, errno
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}
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return size, nil
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}
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// Returns a []byte slice if the xattr is set and nil otherwise
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// Requires path and its attribute as arguments
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func Lgetxattr(path string, attr string) ([]byte, error) {
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var sz int
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pathBytes, err := syscall.BytePtrFromString(path)
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if err != nil {
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return nil, err
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}
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attrBytes, err := syscall.BytePtrFromString(attr)
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if err != nil {
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return nil, err
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}
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// Start with a 128 length byte array
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sz = 128
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dest := make([]byte, sz)
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destBytes := unsafe.Pointer(&dest[0])
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_sz, _, errno := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(destBytes), uintptr(len(dest)), 0, 0)
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switch {
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case errno == syscall.ENODATA:
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return nil, errno
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case errno == syscall.ENOTSUP:
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return nil, errno
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case errno == syscall.ERANGE:
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// 128 byte array might just not be good enough,
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// A dummy buffer is used ``uintptr(0)`` to get real size
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// of the xattrs on disk
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_sz, _, errno = syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(unsafe.Pointer(nil)), uintptr(0), 0, 0)
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sz = int(_sz)
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if sz < 0 {
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return nil, errno
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}
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dest = make([]byte, sz)
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destBytes := unsafe.Pointer(&dest[0])
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_sz, _, errno = syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(destBytes), uintptr(len(dest)), 0, 0)
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if errno != 0 {
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return nil, errno
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}
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case errno != 0:
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return nil, errno
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}
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sz = int(_sz)
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return dest[:sz], nil
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}
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func Lsetxattr(path string, attr string, data []byte, flags int) error {
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pathBytes, err := syscall.BytePtrFromString(path)
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if err != nil {
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return err
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}
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attrBytes, err := syscall.BytePtrFromString(attr)
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if err != nil {
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return err
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}
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var dataBytes unsafe.Pointer
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if len(data) > 0 {
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dataBytes = unsafe.Pointer(&data[0])
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} else {
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dataBytes = unsafe.Pointer(&_zero)
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}
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_, _, errno := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(dataBytes), uintptr(len(data)), uintptr(flags), 0)
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if errno != 0 {
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return errno
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}
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return nil
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}
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