time & date.

rename AddrToInt, StatToInt, etc -> BytePtr, StatPtr, ...

R=r
OCL=15450
CL=15456

src/lib/make.bash

@@ -14,15 +14,25 @@ do
 	cd ..
 done
 
+# Don't sort the files in the for loop - some of the orderings matter.
 rm -f *.6
-for i in fmt.go flag.go container/vector.go rand.go sort.go io.go bufio.go strings.go
+for i in \
+	fmt.go\
+	flag.go\
+	container/vector.go\
+	rand.go\
+	sort.go\
+	io.go\
+	bufio.go\
+	strings.go\
+
 do
 	base=$(basename $i .go)
 	echo 6g -o $GOROOT/pkg/$base.6 $i
 	6g -o $GOROOT/pkg/$base.6 $i
 done
 
-for i in net
+for i in net time
 do
 	echo; echo; echo %%%% making lib/$i %%%%; echo
 	cd $i

src/lib/os/Makefile

@@ -10,7 +10,8 @@ PKG=$(GOROOT)/pkg/os.a
 O1=\
 	os_error.$O
 O2=\
-	os_file.$O
+	os_file.$O\
+	os_time.$O\
 
 install: nuke $(PKG)
 

src/lib/os/os_time.go

@@ -0,0 +1,20 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+import (
+	"os";
+	"syscall"
+)
+
+export func Time() (sec int64, nsec int64, err *Error) {
+	var errno int64;
+	sec, nsec, errno = syscall.gettimeofday()
+	if errno != 0 {
+		return 0, 0, ErrnoToError(errno)
+	}
+	return sec, nsec, nil
+}
+

src/lib/time/Makefile

@@ -0,0 +1,32 @@
+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+O=6
+GC=$(O)g
+
+PKG=$(GOROOT)/pkg/time.a
+
+O1=\
+	zoneinfo.$O
+O2=\
+	time.$O\
+
+install: nuke $(PKG)
+
+$(PKG): a1 a2
+
+a1: 	$(O1)
+	$(O)ar grc $(PKG) $(O1)
+
+a2: 	$(O2)
+	$(O)ar grc $(PKG) $(O2)
+
+nuke:
+	rm -f *.$(O) *.a $(PKG)
+
+clean:
+	rm -f *.$(O) *.a
+
+%.$O:	%.go
+	$(GC) $<

src/lib/time/time.go

@@ -0,0 +1,365 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package time
+
+import (
+	"os";
+	"time"
+)
+
+// Seconds since January 1, 1970 00:00:00 GMT
+export func Seconds() (sec int64, err *os.Error) {
+	var nsec int64;
+	sec, nsec, err = os.Time()
+	return sec, err
+}
+
+// Nanoseconds since January 1, 1970 00:00:00 GMT
+export func Nanoseconds() (nsec int64, err *os.Error) {
+	var sec int64;
+	sec, nsec, err = os.Time()
+	return sec*1e9 + nsec, err
+}
+
+export const (
+	Sunday = iota;
+	Monday;
+	Tuesday;
+	Wednesday;
+	Thursday;
+	Friday;
+	Saturday;
+)
+
+export type Time struct {
+	year int64;	// 2008 is 2008
+	month, day int;	// Sep-17 is 9, 17
+	hour, minute, second int;	// 10:43:12 is 10, 43, 12
+	weekday int;		// Sunday = 0, Monday = 1, ...
+	zoneoffset int;	// seconds west of UTC
+	zone string;
+}
+
+var RegularMonths = []int{
+	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+}
+var LeapMonths = []int{
+	31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+}
+
+func Months(year int64) *[]int {
+	if year%4 == 0 && (year%100 != 0 || year%400 == 0) {
+		return &LeapMonths
+	} else {
+		return &RegularMonths
+	}
+	return nil	// not reached
+}
+
+const (
+	SecondsPerDay = 24*60*60;
+
+	DaysPer400Years = 365*400+97;
+	DaysPer100Years = 365*100+24;
+	DaysPer4Years = 365*4+1;
+
+	Days1970To2001 = 31*365+8;
+)
+
+export func SecondsToUTC(sec int64) *Time {
+	t := new(Time);
+
+	// Split into time and day.
+	day := sec/SecondsPerDay;
+	sec -= day*SecondsPerDay;
+	if sec < 0 {
+		day--
+		sec += SecondsPerDay
+	}
+
+	// Time
+	t.hour = int(sec/3600);
+	t.minute = int((sec/60)%60);
+	t.second = int(sec%60);
+
+	// Day 0 = January 1, 1970 was a Thursday
+	t.weekday = int((day + Thursday) % 7)
+	if t.weekday < 0 {
+		t.weekday += 7
+	}
+
+	// Change day from 0 = 1970 to 0 = 2001,
+	// to make leap year calculations easier
+	// (2001 begins 4-, 100-, and 400-year cycles ending in a leap year.)
+	day -= Days1970To2001;
+
+	year := int64(2001)
+	if day < 0 {
+		// Go back enough 400 year cycles to make day positive.
+		n := -day/DaysPer400Years + 1;
+		year -= 400*n;
+		day += DaysPer400Years*n;
+	} else {
+		// Cut off 400 year cycles.
+		n := day/DaysPer400Years;
+		year += 400*n;
+		day -= DaysPer400Years*n;
+	}
+
+	// Cut off 100-year cycles
+	n := day/DaysPer100Years;
+	year += 100*n;
+	day -= DaysPer100Years*n;
+
+	// Cut off 4-year cycles
+	n = day/DaysPer4Years;
+	year += 4*n;
+	day -= DaysPer4Years*n;
+
+	// Cut off non-leap years.
+	n = day/365;
+	year += n;
+	day -= 365*n;
+
+	t.year = year;
+
+	// If someone ever needs yearday,
+	// tyearday = day (+1?)
+
+	months := Months(year);
+	var m int;
+	yday := int(day);
+	for m = 0; m < 12 && yday >= months[m]; m++ {
+		yday -= months[m]
+	}
+	t.month = m+1;
+	t.day = yday+1;
+	t.zone = "GMT";
+
+	return t;
+}
+
+export func UTC() (t *Time, err *os.Error) {
+	var sec int64;
+	sec, err = Seconds()
+	if err != nil {
+		return nil, err
+	}
+	return SecondsToUTC(sec), nil
+}
+
+// TODO: Should this return an error?
+export func SecondsToLocalTime(sec int64) *Time {
+	zone, offset, ok := time.LookupTimezone(sec)
+	if !ok {
+		return SecondsToUTC(sec)
+	}
+	t := SecondsToUTC(sec+int64(offset));
+	t.zone = zone;
+	t.zoneoffset = offset;
+	return t
+}
+
+export func LocalTime() (t *Time, err *os.Error) {
+	var sec int64;
+	sec, err = Seconds()
+	if err != nil {
+		return nil, err
+	}
+	return SecondsToLocalTime(sec), nil
+}
+
+// Compute number of seconds since January 1, 1970.
+func (t *Time) Seconds() int64 {
+	// First, accumulate days since January 1, 2001.
+	// Using 2001 instead of 1970 makes the leap-year
+	// handling easier (see SecondsToUTC), because 
+	// it is at the beginning of the 4-, 100-, and 400-year cycles.
+	day := int64(0);
+
+	// Rewrite year to be >= 2001.
+	year := t.year;
+	if year < 2001 {
+		n := (2001 - year)/400 + 1;
+		year += 400*n;
+		day -= DaysPer400Years*n;
+	}
+
+	// Add in days from 400-year cycles.
+	n := (year - 2001) / 400;
+	year -= 400*n;
+	day += DaysPer400Years*n;
+
+	// Add in 100-year cycles.
+	n = (year - 2001) / 100;
+	year -= 100*n;
+	day += DaysPer100Years*n;
+
+	// Add in 4-year cycles.
+	n = (year - 2001) / 4;
+	year -= 4*n;
+	day += DaysPer4Years*n;
+
+	// Add in non-leap years.
+	n = year - 2001;
+	day += 365*n;
+
+	// Add in days this year.
+	months := Months(t.year);
+	for m := 0; m < t.month-1; m++ {
+		day += int64(months[m])
+	}
+	day += int64(t.day - 1);
+
+	// Convert days to seconds since January 1, 2001.
+	sec := day * SecondsPerDay;
+
+	// Add in time elapsed today.
+	sec += int64(t.hour) * 3600;
+	sec += int64(t.minute) * 60;
+	sec += int64(t.second);
+
+	// Convert from seconds since 2001 to seconds since 1970.
+	sec += Days1970To2001 * SecondsPerDay;
+
+	// Account for local time zone.
+	sec -= int64(t.zoneoffset)
+	return sec
+}
+
+var LongDayNames = []string{
+	"Sunday",
+	"Monday",
+	"Tuesday",
+	"Wednesday",
+	"Thursday",
+	"Friday",
+	"Saturday"
+}
+
+var ShortDayNames = []string{
+	"Sun",
+	"Mon",
+	"Tue",
+	"Wed",
+	"Thu",
+	"Fri",
+	"Sat"
+}
+
+var ShortMonthNames = []string{
+	"Jan",
+	"Feb",
+	"Mar",
+	"Apr",
+	"May",
+	"Jun",
+	"Jul",
+	"Aug",
+	"Sep",
+	"Oct",
+	"Nov",
+	"Dec"
+}
+
+func Copy(dst *[]byte, s string) {
+	for i := 0; i < len(s); i++ {
+		dst[i] = s[i]
+	}
+}
+
+func Decimal(dst *[]byte, n int) {
+	if n < 0 {
+		n = 0
+	}
+	for i := len(dst)-1; i >= 0; i-- {
+		dst[i] = byte(n%10 + '0');
+		n /= 10
+	}
+}
+
+func AddString(buf *[]byte, bp int, s string) int {
+	n := len(s);
+	Copy(buf[bp:bp+n], s)
+	return bp+n
+}
+
+// Just enough of strftime to implement the date formats below.
+// Not exported.
+func Format(t *Time, fmt string) string {
+	buf := new([]byte, 128);
+	bp := 0
+
+	for i := 0; i < len(fmt); i++ {
+		if fmt[i] == '%' {
+			i++
+			switch fmt[i] {
+			case 'A':	// %A full weekday name
+				bp = AddString(buf, bp, LongDayNames[t.weekday])
+			case 'a':	// %a abbreviated weekday name
+				bp = AddString(buf, bp, ShortDayNames[t.weekday])
+			case 'b':	// %b abbreviated month name
+				bp = AddString(buf, bp, ShortMonthNames[t.month-1])
+			case 'd':	// %d day of month (01-31)
+				Decimal(buf[bp:bp+2], t.day);
+				bp += 2
+			case 'e':	// %e day of month ( 1-31)
+				if t.day >= 10 {
+					Decimal(buf[bp:bp+2], t.day)
+				} else {
+					buf[bp] = ' ';
+					buf[bp+1] = byte(t.day + '0')
+				}
+				bp += 2
+			case 'H':	// %H hour 00-23
+				Decimal(buf[bp:bp+2], t.hour);
+				bp += 2
+			case 'M':	// %M minute 00-59
+				Decimal(buf[bp:bp+2], t.minute);
+				bp += 2
+			case 'S':	// %S second 00-59
+				Decimal(buf[bp:bp+2], t.second);
+				bp += 2
+			case 'Y':	// %Y year 2008
+				Decimal(buf[bp:bp+4], int(t.year));
+				bp += 4
+			case 'y':	// %y year 08
+				Decimal(buf[bp:bp+2], int(t.year%100));
+				bp += 2
+			case 'Z':
+				bp = AddString(buf, bp, t.zone)
+			default:
+				buf[bp] = '%';
+				buf[bp+1] = fmt[i];
+				bp += 2
+			}
+		} else {
+			buf[bp] = fmt[i];
+			bp++
+		}
+	}
+	return string(buf[0:bp])
+}
+
+// ANSI C asctime: Sun Nov  6 08:49:37 1994
+func (t *Time) Asctime() string {
+	return Format(t, "%a %b %e %H:%M:%S %Y")
+}
+
+// RFC 850: Sunday, 06-Nov-94 08:49:37 GMT
+func (t *Time) RFC850() string {
+	return Format(t, "%A, %d-%b-%y %H:%M:%S %Z")
+}
+
+// RFC 1123: Sun, 06 Nov 1994 08:49:37 GMT
+func (t *Time) RFC1123() string {
+	return Format(t, "%a, %d %b %Y %H:%M:%S %Z")
+}
+
+// date(1) - Sun Nov  6 08:49:37 GMT 1994
+func (t *Time) String() string {
+	return Format(t, "%a %b %e %H:%M:%S %Z %Y")
+}
+

src/lib/time/zoneinfo.go

@@ -0,0 +1,14 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// TODO: Figure out a better place to put this.
+package time
+
+// TODO(rsc): Parse zone info file.
+// Amazingly, they are portable across OS X, Linux, BSD, Sun, etc.
+// I know how, I just don't want to do it right now.
+
+export func LookupTimezone(sec int64) (zone string, offset int, ok bool) {
+	return "PDT", -7*60*60, true
+}

src/syscall/Makefile

@@ -16,6 +16,7 @@ O1=\
 
 O2=\
 	file_$(GOARCH)_$(GOOS).$O \
+	time_$(GOARCH)_$(GOOS).$O \
 	syscall_$(GOARCH)_$(GOOS).$O \
 
 

src/syscall/file_amd64_darwin.go

@@ -13,7 +13,7 @@ import syscall "syscall"
 //export open, creat, close, read, write, pipe
 //export unlink
 
-func	StatToInt(s *Stat) int64;
+func	StatPtr(s *Stat) int64;
 
 type dev_t uint32;
 type ino_t uint64;
@@ -73,7 +73,7 @@ export func open(name string, mode int64, perm int64) (ret int64, errno int64) {
 		return -1, syscall.ENAMETOOLONG
 	}
 	const SYSOPEN = 5;
-	r1, r2, err := syscall.Syscall(SYSOPEN, AddrToInt(&namebuf[0]), mode, perm);
+	r1, r2, err := syscall.Syscall(SYSOPEN, BytePtr(&namebuf[0]), mode, perm);
 	return r1, err;
 }
 
@@ -83,7 +83,7 @@ export func creat(name string, perm int64) (ret int64, errno int64) {
 		return -1, syscall.ENAMETOOLONG
 	}
 	const SYSOPEN = 5;
-	r1, r2, err := syscall.Syscall(SYSOPEN, AddrToInt(&namebuf[0]), O_CREAT|O_WRONLY|O_TRUNC, perm);
+	r1, r2, err := syscall.Syscall(SYSOPEN, BytePtr(&namebuf[0]), O_CREAT|O_WRONLY|O_TRUNC, perm);
 	return r1, err;
 }
 
@@ -95,13 +95,13 @@ export func close(fd int64) (ret int64, errno int64) {
 
 export func read(fd int64, buf *byte, nbytes int64) (ret int64, errno int64) {
 	const SYSREAD = 3;
-	r1, r2, err := syscall.Syscall(SYSREAD, fd, AddrToInt(buf), nbytes);
+	r1, r2, err := syscall.Syscall(SYSREAD, fd, BytePtr(buf), nbytes);
 	return r1, err;
 }
 
 export func write(fd int64, buf *byte, nbytes int64) (ret int64, errno int64) {
 	const SYSWRITE = 4;
-	r1, r2, err := syscall.Syscall(SYSWRITE, fd, AddrToInt(buf), nbytes);
+	r1, r2, err := syscall.Syscall(SYSWRITE, fd, BytePtr(buf), nbytes);
 	return r1, err;
 }
 
@@ -122,19 +122,19 @@ export func stat(name string, buf *Stat) (ret int64, errno int64) {
 		return -1, syscall.ENAMETOOLONG
 	}
 	const SYSSTAT = 338;
-	r1, r2, err := syscall.Syscall(SYSSTAT, AddrToInt(&namebuf[0]), StatToInt(buf), 0);
+	r1, r2, err := syscall.Syscall(SYSSTAT, BytePtr(&namebuf[0]), StatPtr(buf), 0);
 	return r1, err;
 }
 
 export func lstat(name *byte, buf *Stat) (ret int64, errno int64) {
 	const SYSLSTAT = 340;
-	r1, r2, err := syscall.Syscall(SYSLSTAT, AddrToInt(name), StatToInt(buf), 0);
+	r1, r2, err := syscall.Syscall(SYSLSTAT, BytePtr(name), StatPtr(buf), 0);
 	return r1, err;
 }
 
 export func fstat(fd int64, buf *Stat) (ret int64, errno int64) {
 	const SYSFSTAT = 339;
-	r1, r2, err := syscall.Syscall(SYSFSTAT, fd, StatToInt(buf), 0);
+	r1, r2, err := syscall.Syscall(SYSFSTAT, fd, StatPtr(buf), 0);
 	return r1, err;
 }
 
@@ -144,6 +144,6 @@ export func unlink(name string) (ret int64, errno int64) {
 		return -1, syscall.ENAMETOOLONG
 	}
 	const SYSUNLINK = 10;
-	r1, r2, err := syscall.Syscall(SYSUNLINK, AddrToInt(&namebuf[0]), 0, 0);
+	r1, r2, err := syscall.Syscall(SYSUNLINK, BytePtr(&namebuf[0]), 0, 0);
 	return r1, err;
 }

src/syscall/file_amd64_linux.go

@@ -13,8 +13,8 @@ import syscall "syscall"
 //export open, creat, close, read, write, pipe
 //export unlink
 
-func	StatToInt(s *Stat) int64;
+func	StatPtr(s *Stat) int64;
-func	Addr32ToInt(s *int32) int64;
+func	Int32Ptr(s *int32) int64;
 
 type dev_t uint64;
 type ino_t uint64;
@@ -74,7 +74,7 @@ export func open(name string, mode int64, perm int64) (ret int64, errno int64) {
 		return -1, syscall.ENAMETOOLONG
 	}
 	const SYSOPEN = 2;
-	r1, r2, err := syscall.Syscall(SYSOPEN, AddrToInt(&namebuf[0]), mode, perm);
+	r1, r2, err := syscall.Syscall(SYSOPEN, BytePtr(&namebuf[0]), mode, perm);
 	return r1, err;
 }
 
@@ -84,7 +84,7 @@ export func creat(name string, perm int64) (ret int64, errno int64) {
 		return -1, syscall.ENAMETOOLONG
 	}
 	const SYSOPEN = 2;
-	r1, r2, err := syscall.Syscall(SYSOPEN, AddrToInt(&namebuf[0]),  O_CREAT|O_WRONLY|O_TRUNC, perm);
+	r1, r2, err := syscall.Syscall(SYSOPEN, BytePtr(&namebuf[0]),  O_CREAT|O_WRONLY|O_TRUNC, perm);
 	return r1, err;
 }
 
@@ -96,20 +96,20 @@ export func close(fd int64) (ret int64, errno int64) {
 
 export func read(fd int64, buf *byte, nbytes int64) (ret int64, errno int64) {
 	const SYSREAD = 0;
-	r1, r2, err := syscall.Syscall(SYSREAD, fd, AddrToInt(buf), nbytes);
+	r1, r2, err := syscall.Syscall(SYSREAD, fd, BytePtr(buf), nbytes);
 	return r1, err;
 }
 
 export func write(fd int64, buf *byte, nbytes int64) (ret int64, errno int64) {
 	const SYSWRITE = 1;
-	r1, r2, err := syscall.Syscall(SYSWRITE, fd, AddrToInt(buf), nbytes);
+	r1, r2, err := syscall.Syscall(SYSWRITE, fd, BytePtr(buf), nbytes);
 	return r1, err;
 }
 
 export func pipe(fds *[2]int64) (ret int64, errno int64) {
 	const SYSPIPE = 22;
 	var t [2] int32;
-	r1, r2, err := syscall.Syscall(SYSPIPE, Addr32ToInt(&t[0]), 0, 0);
+	r1, r2, err := syscall.Syscall(SYSPIPE, Int32Ptr(&t[0]), 0, 0);
 	if r1 < 0 {
 		return r1, err;
 	}
@@ -124,19 +124,19 @@ export func stat(name string, buf *Stat) (ret int64, errno int64) {
 		return -1, syscall.ENAMETOOLONG
 	}
 	const SYSSTAT = 4;
-	r1, r2, err := syscall.Syscall(SYSSTAT, AddrToInt(&namebuf[0]), StatToInt(buf), 0);
+	r1, r2, err := syscall.Syscall(SYSSTAT, BytePtr(&namebuf[0]), StatPtr(buf), 0);
 	return r1, err;
 }
 
 export func lstat(name *byte, buf *Stat) (ret int64, errno int64) {
 	const SYSLSTAT = 6;
-	r1, r2, err := syscall.Syscall(SYSLSTAT, AddrToInt(name), StatToInt(buf), 0);
+	r1, r2, err := syscall.Syscall(SYSLSTAT, BytePtr(name), StatPtr(buf), 0);
 	return r1, err;
 }
 
 export func fstat(fd int64, buf *Stat) (ret int64, errno int64) {
 	const SYSFSTAT = 5;
-	r1, r2, err := syscall.Syscall(SYSFSTAT, fd, StatToInt(buf), 0);
+	r1, r2, err := syscall.Syscall(SYSFSTAT, fd, StatPtr(buf), 0);
 	return r1, err;
 }
 
@@ -146,6 +146,6 @@ export func unlink(name string) (ret int64, errno int64) {
 		return -1, syscall.ENAMETOOLONG
 	}
 	const SYSUNLINK = 87;
-	r1, r2, err := syscall.Syscall(SYSUNLINK, AddrToInt(&namebuf[0]), 0, 0);
+	r1, r2, err := syscall.Syscall(SYSUNLINK, BytePtr(&namebuf[0]), 0, 0);
 	return r1, err;
 }

src/syscall/syscall.go

@@ -10,7 +10,7 @@ package syscall
 
 export func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64);
 export func Syscall6(trap int64, a1, a2, a3, a4, a5, a6 int64) (r1, r2, err int64);
-export func AddrToInt(b *byte) int64;
+export func BytePtr(b *byte) int64;
 
 /*
  * Used to convert file names to byte arrays for passing to kernel,

src/syscall/syscall_amd64_darwin.s

@@ -48,12 +48,12 @@ TEXT	syscall·Syscall6(SB),7,$-8
 	RET
 
 // conversion operators - really just casts
-TEXT	syscall·AddrToInt(SB),7,$-8
+TEXT	syscall·BytePtr(SB),7,$-8
 	MOVQ	8(SP), AX
 	MOVQ	AX, 16(SP)
 	RET
 
-TEXT	syscall·StatToInt(SB),7,$-8
+TEXT	syscall·StatPtr(SB),7,$-8
 	MOVQ	8(SP), AX
 	MOVQ	AX, 16(SP)
 	RET

src/syscall/syscall_amd64_linux.s

@@ -50,17 +50,22 @@ TEXT syscall·Syscall6(SB),7,$-8
 	RET
 
 // conversion operators - really just casts
-TEXT	syscall·AddrToInt(SB),7,$-8
+TEXT	syscall·BytePtr(SB),7,$-8
 	MOVQ	8(SP), AX
 	MOVQ	AX, 16(SP)
 	RET
 
-TEXT	syscall·Addr32ToInt(SB),7,$-8
+TEXT	syscall·Int32Ptr(SB),7,$-8
 	MOVQ	8(SP), AX
 	MOVQ	AX, 16(SP)
 	RET
 
-TEXT	syscall·StatToInt(SB),7,$-8
+TEXT	syscall·Int64Ptr(SB),7,$-8
+	MOVQ	8(SP), AX
+	MOVQ	AX, 16(SP)
+	RET
+
+TEXT	syscall·StatPtr(SB),7,$-8
 	MOVQ	8(SP), AX
 	MOVQ	AX, 16(SP)
 	RET

src/syscall/time_amd64_darwin.go

@@ -0,0 +1,19 @@
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package syscall
+
+import syscall "syscall"
+
+export func gettimeofday() (sec, nsec, errno int64) {
+	const GETTIMEOFDAY = 116;
+	// The "1" in the call is the timeval pointer, which must be
+	// non-zero but is otherwise unused.  The results
+	// are returned in r1, r2.
+	r1, r2, err := syscall.Syscall(GETTIMEOFDAY, 1, 0, 0);
+	if err != 0 {
+		return 0, 0, err
+	}
+	return r1, r2, 0
+}

src/syscall/time_amd64_linux.go

@@ -0,0 +1,19 @@
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package syscall
+
+import syscall "syscall"
+
+func	Int64Ptr(s *int64) int64;
+
+export func gettimeofday() (sec, nsec, errno int64) {
+	const GETTIMEOFDAY = 96
+	var tv [2]int64;	// struct timeval
+	r1, r2, err := syscall.Syscall(GETTIMEOFDAY, Int64Ptr(&tv[0]), 0, 0);
+	if err != 0 {
+		return 0, 0, err
+	}
+	return tv[0], tv[1], 0
+}