os/syscall: correct netbsd types/names

Fix types/names so that these functions work with the generated
syscall/z* files.

R=golang-dev, m4dh4tt3r
CC=golang-dev
https://golang.org/cl/6201078

src/pkg/os/stat_netbsd.go

@@ -19,7 +19,7 @@ func fileInfoFromStat(st *syscall.Stat_t, name string) FileInfo {
 	fs := &fileStat{
 		name:    basename(name),
 		size:    int64(st.Size),
-		modTime: timespecToTime(st.Mtim),
+		modTime: timespecToTime(st.Mtimespec),
 		sys:     st,
 	}
 	fs.mode = FileMode(st.Mode & 0777)
@@ -57,5 +57,5 @@ func timespecToTime(ts syscall.Timespec) time.Time {
 
 // For testing.
 func atime(fi FileInfo) time.Time {
-	return timespecToTime(fi.Sys().(*syscall.Stat_t).Atim)
+	return timespecToTime(fi.Sys().(*syscall.Stat_t).Atimespec)
 }

src/pkg/syscall/syscall_netbsd_386.go

@@ -9,7 +9,7 @@ func Getpagesize() int { return 4096 }
 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
 
 func NsecToTimespec(nsec int64) (ts Timespec) {
-	ts.Sec = int32(nsec / 1e9)
+	ts.Sec = int64(nsec / 1e9)
 	ts.Nsec = int32(nsec % 1e9)
 	return
 }
@@ -19,14 +19,14 @@ func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)
 func NsecToTimeval(nsec int64) (tv Timeval) {
 	nsec += 999 // round up to microsecond
 	tv.Usec = int32(nsec % 1e9 / 1e3)
-	tv.Sec = int32(nsec / 1e9)
+	tv.Sec = int64(nsec / 1e9)
 	return
 }
 
 func SetKevent(k *Kevent_t, fd, mode, flags int) {
 	k.Ident = uint32(fd)
-	k.Filter = int16(mode)
-	k.Flags = uint16(flags)
+	k.Filter = uint32(mode)
+	k.Flags = uint32(flags)
 }
 
 func (iov *Iovec) SetLen(length int) {

src/pkg/syscall/syscall_netbsd_amd64.go

@@ -9,8 +9,8 @@ func Getpagesize() int { return 4096 }
 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
 
 func NsecToTimespec(nsec int64) (ts Timespec) {
-	ts.Sec = int32(nsec / 1e9)
-	ts.Nsec = nsec % 1e9
+	ts.Sec = int64(nsec / 1e9)
+	ts.Nsec = int64(nsec % 1e9)
 	return
 }
 
@@ -18,15 +18,15 @@ func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)
 
 func NsecToTimeval(nsec int64) (tv Timeval) {
 	nsec += 999 // round up to microsecond
-	tv.Usec = nsec % 1e9 / 1e3
+	tv.Usec = int32(nsec % 1e9 / 1e3)
 	tv.Sec = int64(nsec / 1e9)
 	return
 }
 
 func SetKevent(k *Kevent_t, fd, mode, flags int) {
 	k.Ident = uint64(fd)
-	k.Filter = int16(mode)
-	k.Flags = uint16(flags)
+	k.Filter = uint32(mode)
+	k.Flags = uint32(flags)
 }
 
 func (iov *Iovec) SetLen(length int) {