runtime: wrap nanotime, walltime, and write

In preparation for general faketime support, this renames the existing
nanotime, walltime, and write functions to nanotime1, walltime1, and
write1 and wraps them with trivial Go functions. This will let us
inject different implementations on all platforms when faketime is
enabled.

Updates #30439.

Change-Id: Ice5ccc513a32a6d89ea051638676d3ee05b00418
Reviewed-on: https://go-review.googlesource.com/c/go/+/192738
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/runtime/os_plan9.go b/src/runtime/os_plan9.go
index d7ea1ef841..2f8d0a0c8e 100644
--- a/src/runtime/os_plan9.go
+++ b/src/runtime/os_plan9.go
@@ -328,7 +328,7 @@ func usleep(µs uint32) {
 }
 
 //go:nosplit
-func nanotime() int64 {
+func nanotime1() int64 {
 	var scratch int64
 	ns := nsec(&scratch)
 	// TODO(aram): remove hack after I fix _nsec in the pc64 kernel.
@@ -373,7 +373,7 @@ func postnote(pid uint64, msg []byte) int {
 		return -1
 	}
 	len := findnull(&msg[0])
-	if write(uintptr(fd), unsafe.Pointer(&msg[0]), int32(len)) != int64(len) {
+	if write1(uintptr(fd), unsafe.Pointer(&msg[0]), int32(len)) != int32(len) {
 		closefd(fd)
 		return -1
 	}
@@ -451,8 +451,8 @@ func read(fd int32, buf unsafe.Pointer, n int32) int32 {
 }
 
 //go:nosplit
-func write(fd uintptr, buf unsafe.Pointer, n int32) int64 {
-	return int64(pwrite(int32(fd), buf, n, -1))
+func write1(fd uintptr, buf unsafe.Pointer, n int32) int32 {
+	return pwrite(int32(fd), buf, n, -1)
 }
 
 var _badsignal = []byte("runtime: signal received on thread not created by Go.\n")