unix: add missing constants used with struct Timex on Linux

This provides definitions for Linux of two groups of constants,
which are used with struct Timex (used with the adjtimex and
clock_adjtime system calls): the ADJ_* constants are used
for the modes field; the STA_* constants are used for the status
field. The constants are documented in the adjtimex(2) man page.

Fixes golang/go#58012

Change-Id: I054f0c40f9cfd9360a0bb10716a08e19584c0fff
Reviewed-on: https://go-review.googlesource.com/c/sys/+/464241
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
diff --git a/unix/linux/types.go b/unix/linux/types.go
index 3855ce3..2c282c4 100644
--- a/unix/linux/types.go
+++ b/unix/linux/types.go
@@ -478,6 +478,41 @@
 type Itimerval C.struct_itimerval
 
 const (
+	ADJ_OFFSET            = C.ADJ_OFFSET
+	ADJ_FREQUENCY         = C.ADJ_FREQUENCY
+	ADJ_MAXERROR          = C.ADJ_MAXERROR
+	ADJ_ESTERROR          = C.ADJ_ESTERROR
+	ADJ_STATUS            = C.ADJ_STATUS
+	ADJ_TIMECONST         = C.ADJ_TIMECONST
+	ADJ_TAI               = C.ADJ_TAI
+	ADJ_SETOFFSET         = C.ADJ_SETOFFSET
+	ADJ_MICRO             = C.ADJ_MICRO
+	ADJ_NANO              = C.ADJ_NANO
+	ADJ_TICK              = C.ADJ_TICK
+	ADJ_OFFSET_SINGLESHOT = C.ADJ_OFFSET_SINGLESHOT
+	ADJ_OFFSET_SS_READ    = C.ADJ_OFFSET_SS_READ
+)
+
+const (
+	STA_PLL       = C.STA_PLL
+	STA_PPSFREQ   = C.STA_PPSFREQ
+	STA_PPSTIME   = C.STA_PPSTIME
+	STA_FLL       = C.STA_FLL
+	STA_INS       = C.STA_INS
+	STA_DEL       = C.STA_DEL
+	STA_UNSYNC    = C.STA_UNSYNC
+	STA_FREQHOLD  = C.STA_FREQHOLD
+	STA_PPSSIGNAL = C.STA_PPSSIGNAL
+	STA_PPSJITTER = C.STA_PPSJITTER
+	STA_PPSWANDER = C.STA_PPSWANDER
+	STA_PPSERROR  = C.STA_PPSERROR
+	STA_CLOCKERR  = C.STA_CLOCKERR
+	STA_NANO      = C.STA_NANO
+	STA_MODE      = C.STA_MODE
+	STA_CLK       = C.STA_CLK
+)
+
+const (
 	TIME_OK    = C.TIME_OK
 	TIME_INS   = C.TIME_INS
 	TIME_DEL   = C.TIME_DEL
diff --git a/unix/ztypes_linux.go b/unix/ztypes_linux.go
index bacf1d9..7d9fc8f 100644
--- a/unix/ztypes_linux.go
+++ b/unix/ztypes_linux.go
@@ -30,6 +30,41 @@
 }
 
 const (
+	ADJ_OFFSET            = 0x1
+	ADJ_FREQUENCY         = 0x2
+	ADJ_MAXERROR          = 0x4
+	ADJ_ESTERROR          = 0x8
+	ADJ_STATUS            = 0x10
+	ADJ_TIMECONST         = 0x20
+	ADJ_TAI               = 0x80
+	ADJ_SETOFFSET         = 0x100
+	ADJ_MICRO             = 0x1000
+	ADJ_NANO              = 0x2000
+	ADJ_TICK              = 0x4000
+	ADJ_OFFSET_SINGLESHOT = 0x8001
+	ADJ_OFFSET_SS_READ    = 0xa001
+)
+
+const (
+	STA_PLL       = 0x1
+	STA_PPSFREQ   = 0x2
+	STA_PPSTIME   = 0x4
+	STA_FLL       = 0x8
+	STA_INS       = 0x10
+	STA_DEL       = 0x20
+	STA_UNSYNC    = 0x40
+	STA_FREQHOLD  = 0x80
+	STA_PPSSIGNAL = 0x100
+	STA_PPSJITTER = 0x200
+	STA_PPSWANDER = 0x400
+	STA_PPSERROR  = 0x800
+	STA_CLOCKERR  = 0x1000
+	STA_NANO      = 0x2000
+	STA_MODE      = 0x4000
+	STA_CLK       = 0x8000
+)
+
+const (
 	TIME_OK    = 0x0
 	TIME_INS   = 0x1
 	TIME_DEL   = 0x2