forked from containerd/continuity
/
devices_unix.go
55 lines (46 loc) · 1.03 KB
/
devices_unix.go
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// +build linux darwin
package continuity
import (
"fmt"
"os"
"syscall"
)
func deviceInfo(fi os.FileInfo) (uint64, uint64, error) {
sys, ok := fi.Sys().(*syscall.Stat_t)
if !ok {
return 0, 0, fmt.Errorf("cannot extract device from os.FileInfo")
}
return getmajor(sys.Rdev), getminor(sys.Rdev), nil
}
// mknod provides a shortcut for syscall.Mknod
func mknod(p string, mode os.FileMode, maj, min int) error {
var (
m = syscallMode(mode.Perm())
dev int
)
if mode&os.ModeDevice != 0 {
dev = makedev(maj, min)
if mode&os.ModeCharDevice != 0 {
m |= syscall.S_IFCHR
} else {
m |= syscall.S_IFBLK
}
} else if mode&os.ModeNamedPipe != 0 {
m |= syscall.S_IFIFO
}
return syscall.Mknod(p, m, dev)
}
// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
func syscallMode(i os.FileMode) (o uint32) {
o |= uint32(i.Perm())
if i&os.ModeSetuid != 0 {
o |= syscall.S_ISUID
}
if i&os.ModeSetgid != 0 {
o |= syscall.S_ISGID
}
if i&os.ModeSticky != 0 {
o |= syscall.S_ISVTX
}
return
}