unix: add clock_gettime for Linux

Includes 386, amd64, and arm for Linux.

Change-Id: I428bfb732141448659a94dc6e2ab7a98efea507a
Reviewed-on: https://go-review.googlesource.com/9766Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: David Symonds <dsymonds@golang.org>

unix/mkerrors.sh

@@ -218,6 +218,7 @@ includes='
 #include <sys/signal.h>
 #include <signal.h>
 #include <sys/resource.h>
+#include <time.h>
 '
 ccflags="$@"
 
@@ -296,6 +297,7 @@ ccflags="$@"
 		$2 ~ /^CLONE_[A-Z_]+/ ||
 		$2 !~ /^(BPF_TIMEVAL)$/ &&
 		$2 ~ /^(BPF|DLT)_/ ||
+		$2 ~ /^CLOCK_/ ||
 		$2 !~ "WMESGLEN" &&
 		$2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}
 		$2 ~ /^__WCOREFLAG$/ {next}

unix/syscall_linux.go

@@ -795,6 +795,7 @@ func Mount(source string, target string, fstype string, flags uintptr, data stri
 //sys	Chdir(path string) (err error)
 //sys	Chmod(path string, mode uint32) (err error)
 //sys	Chroot(path string) (err error)
+//sys	ClockGettime(clockid int32, time *Timespec) (err error)
 //sys	Close(fd int) (err error)
 //sys	Creat(path string, mode uint32) (fd int, err error)
 //sys	Dup(oldfd int) (fd int, err error)
@@ -926,7 +927,6 @@ func Munmap(b []byte) (err error) {
 // Capget
 // Capset
 // ClockGetres
-// ClockGettime
 // ClockNanosleep
 // ClockSettime
 // Clone

unix/zerrors_linux_386.go

@@ -186,6 +186,21 @@ const (
 	BRKINT                           = 0x2
 	CFLUSH                           = 0xf
 	CLOCAL                           = 0x800
+	CLOCK_BOOTTIME                   = 0x7
+	CLOCK_BOOTTIME_ALARM             = 0x9
+	CLOCK_DEFAULT                    = 0x0
+	CLOCK_EXT                        = 0x1
+	CLOCK_INT                        = 0x2
+	CLOCK_MONOTONIC                  = 0x1
+	CLOCK_MONOTONIC_COARSE           = 0x6
+	CLOCK_MONOTONIC_RAW              = 0x4
+	CLOCK_PROCESS_CPUTIME_ID         = 0x2
+	CLOCK_REALTIME                   = 0x0
+	CLOCK_REALTIME_ALARM             = 0x8
+	CLOCK_REALTIME_COARSE            = 0x5
+	CLOCK_THREAD_CPUTIME_ID          = 0x3
+	CLOCK_TXFROMRX                   = 0x4
+	CLOCK_TXINT                      = 0x3
 	CLONE_CHILD_CLEARTID             = 0x200000
 	CLONE_CHILD_SETTID               = 0x1000000
 	CLONE_DETACHED                   = 0x400000

unix/zerrors_linux_amd64.go

@@ -186,6 +186,21 @@ const (
 	BRKINT                           = 0x2
 	CFLUSH                           = 0xf
 	CLOCAL                           = 0x800
+	CLOCK_BOOTTIME                   = 0x7
+	CLOCK_BOOTTIME_ALARM             = 0x9
+	CLOCK_DEFAULT                    = 0x0
+	CLOCK_EXT                        = 0x1
+	CLOCK_INT                        = 0x2
+	CLOCK_MONOTONIC                  = 0x1
+	CLOCK_MONOTONIC_COARSE           = 0x6
+	CLOCK_MONOTONIC_RAW              = 0x4
+	CLOCK_PROCESS_CPUTIME_ID         = 0x2
+	CLOCK_REALTIME                   = 0x0
+	CLOCK_REALTIME_ALARM             = 0x8
+	CLOCK_REALTIME_COARSE            = 0x5
+	CLOCK_THREAD_CPUTIME_ID          = 0x3
+	CLOCK_TXFROMRX                   = 0x4
+	CLOCK_TXINT                      = 0x3
 	CLONE_CHILD_CLEARTID             = 0x200000
 	CLONE_CHILD_SETTID               = 0x1000000
 	CLONE_DETACHED                   = 0x400000

unix/zerrors_linux_arm.go

@@ -148,6 +148,21 @@ const (
 	BPF_TXA                          = 0x80
 	BPF_W                            = 0x0
 	BPF_X                            = 0x8
+	CLOCK_BOOTTIME                   = 0x7
+	CLOCK_BOOTTIME_ALARM             = 0x9
+	CLOCK_DEFAULT                    = 0x0
+	CLOCK_EXT                        = 0x1
+	CLOCK_INT                        = 0x2
+	CLOCK_MONOTONIC                  = 0x1
+	CLOCK_MONOTONIC_COARSE           = 0x6
+	CLOCK_MONOTONIC_RAW              = 0x4
+	CLOCK_PROCESS_CPUTIME_ID         = 0x2
+	CLOCK_REALTIME                   = 0x0
+	CLOCK_REALTIME_ALARM             = 0x8
+	CLOCK_REALTIME_COARSE            = 0x5
+	CLOCK_THREAD_CPUTIME_ID          = 0x3
+	CLOCK_TXFROMRX                   = 0x4
+	CLOCK_TXINT                      = 0x3
 	CLONE_CHILD_CLEARTID             = 0x200000
 	CLONE_CHILD_SETTID               = 0x1000000
 	CLONE_DETACHED                   = 0x400000

unix/zsyscall_linux_386.go

@@ -281,6 +281,16 @@ func Chroot(path string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func ClockGettime(clockid int32, time *Timespec) (err error) {
+	_, _, e1 := Syscall(SYS_CLOCK_GETTIME, uintptr(clockid), uintptr(unsafe.Pointer(time)), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Close(fd int) (err error) {
 	_, _, e1 := Syscall(SYS_CLOSE, uintptr(fd), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_amd64.go

@@ -281,6 +281,16 @@ func Chroot(path string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func ClockGettime(clockid int32, time *Timespec) (err error) {
+	_, _, e1 := Syscall(SYS_CLOCK_GETTIME, uintptr(clockid), uintptr(unsafe.Pointer(time)), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Close(fd int) (err error) {
 	_, _, e1 := Syscall(SYS_CLOSE, uintptr(fd), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_arm.go

@@ -281,6 +281,16 @@ func Chroot(path string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func ClockGettime(clockid int32, time *Timespec) (err error) {
+	_, _, e1 := Syscall(SYS_CLOCK_GETTIME, uintptr(clockid), uintptr(unsafe.Pointer(time)), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Close(fd int) (err error) {
 	_, _, e1 := Syscall(SYS_CLOSE, uintptr(fd), 0, 0)
 	if e1 != 0 {