all: add GOOS=ios

Introduce GOOS=ios for iOS systems. GOOS=ios matches "darwin"
build tag, like GOOS=android matches "linux" and GOOS=illumos
matches "solaris". Only ios/arm64 is supported (ios/amd64 is
not).

GOOS=ios and GOOS=darwin remain essentially the same at this
point. They will diverge at later time, to differentiate macOS
and iOS.

Uses of GOOS=="darwin" are changed to (GOOS=="darwin" || GOOS=="ios"),
except if it clearly means macOS (e.g. GOOS=="darwin" && GOARCH=="amd64"),
it remains GOOS=="darwin".

Updates #38485.

Change-Id: I4faacdc1008f42434599efb3c3ad90763a83b67c
Reviewed-on: https://go-review.googlesource.com/c/go/+/254740
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

4 files changed, 8 insertions, 8 deletions

diff --git a/src/os/file_unix.go b/src/os/file_unix.go
index 5446dd5003..dc7d868a32 100644
--- a/src/os/file_unix.go
+++ b/src/os/file_unix.go
@@ -129,7 +129,7 @@ func newFile(fd uintptr, name string, kind newFileKind) *File {
 	// used with kqueue.
 	if kind == kindOpenFile {
 		switch runtime.GOOS {
-		case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd":
+		case "darwin", "ios", "dragonfly", "freebsd", "netbsd", "openbsd":
 			var st syscall.Stat_t
 			err := ignoringEINTR(func() error {
 				return syscall.Fstat(fdi, &st)
@@ -150,7 +150,7 @@ func newFile(fd uintptr, name string, kind newFileKind) *File {
 			// on Darwin, kqueue does not work properly with fifos:
 			// closing the last writer does not cause a kqueue event
 			// for any readers. See issue #24164.
-			if runtime.GOOS == "darwin" && typ == syscall.S_IFIFO {
+			if (runtime.GOOS == "darwin" || runtime.GOOS == "ios") && typ == syscall.S_IFIFO {
 				pollable = false
 			}
 		}
diff --git a/src/os/os_test.go b/src/os/os_test.go
index 3359301316..2bb57d866f 100644
--- a/src/os/os_test.go
+++ b/src/os/os_test.go
@@ -52,7 +52,7 @@ var sysdir = func() *sysDir {
 				"libpowermanager.so",
 			},
 		}
-	case "darwin":
+	case "darwin", "ios":
 		switch runtime.GOARCH {
 		case "arm64":
 			wd, err := syscall.Getwd()
@@ -144,7 +144,7 @@ func localTmp() string {
 	switch runtime.GOOS {
 	case "android", "windows":
 		return TempDir()
-	case "darwin":
+	case "darwin", "ios":
 		switch runtime.GOARCH {
 		case "arm64":
 			return TempDir()
@@ -481,7 +481,7 @@ func TestReaddirnamesOneAtATime(t *testing.T) {
 	switch runtime.GOOS {
 	case "android":
 		dir = "/system/bin"
-	case "darwin":
+	case "darwin", "ios":
 		switch runtime.GOARCH {
 		case "arm64":
 			wd, err := Getwd()
@@ -1304,7 +1304,7 @@ func TestChdirAndGetwd(t *testing.T) {
 		dirs = []string{"/system/bin"}
 	case "plan9":
 		dirs = []string{"/", "/usr"}
-	case "darwin":
+	case "darwin", "ios":
 		switch runtime.GOARCH {
 		case "arm64":
 			dirs = nil
diff --git a/src/os/path_test.go b/src/os/path_test.go
index d586daf936..3fe9c5ffa3 100644
--- a/src/os/path_test.go
+++ b/src/os/path_test.go
@@ -107,7 +107,7 @@ func TestMkdirAllAtSlash(t *testing.T) {
 	switch runtime.GOOS {
 	case "android", "plan9", "windows":
 		t.Skipf("skipping on %s", runtime.GOOS)
-	case "darwin":
+	case "darwin", "ios":
 		switch runtime.GOARCH {
 		case "arm64":
 			t.Skipf("skipping on darwin/arm64, mkdir returns EPERM")
diff --git a/src/os/removeall_test.go b/src/os/removeall_test.go
index 8a71f687ed..1e5c650fe1 100644
--- a/src/os/removeall_test.go
+++ b/src/os/removeall_test.go
@@ -158,7 +158,7 @@ func TestRemoveAllLarge(t *testing.T) {
 
 func TestRemoveAllLongPath(t *testing.T) {
 	switch runtime.GOOS {
-	case "aix", "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "illumos", "solaris":
+	case "aix", "darwin", "ios", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "illumos", "solaris":
 		break
 	default:
 		t.Skip("skipping for not implemented platforms")