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Add API to decode 'stat.st_rdev' into major and minor numbers.

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PiperOrigin-RevId: 204936533
Change-Id: Ib060920077fc914f97c4a0548a176d1368510c7b
This commit is contained in:
Neel Natu
2018-07-17 10:50:53 -07:00
committed by Shentubot
parent beb89bb757
commit ed2e03d378
1 changed files with 7 additions and 0 deletions
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pkg/abi/linux/dev.go
+7
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@@ -25,6 +25,13 @@ func MakeDeviceID(major uint16, minor uint32) uint32 {
return (minor & 0xff) | ((uint32(major) & 0xfff) << 8) | ((minor >> 8) << 20)
}
// DecodeDeviceID decodes a device ID into major and minor device numbers.
func DecodeDeviceID(rdev uint32) (uint16, uint32) {
major := uint16((rdev >> 8) & 0xfff)
minor := (rdev & 0xff) | ((rdev >> 20) << 8)
return major, minor
}
// Character device IDs.
//
// See Documentations/devices.txt and uapi/linux/major.h.