internal/poll: make sendfile(2) work on Androids

Fixes some Android builders.

Ref:
https://build.golang.org/log/2b60164954ad0c56ce5134cb2bb81d1532723253
https://build.golang.org/log/f5290236a27b099020fe56ff5d271886353b64f8

Change-Id: Ia5305aefa9ca8230dfa0cd892b79b8cf60e40430
Reviewed-on: https://go-review.googlesource.com/c/go/+/622998
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

diff --git a/src/internal/poll/sendfile_unix.go b/src/internal/poll/sendfile_unix.go
index 1426a1229b453cfe1a333f64e6b68df0379873ef..1efcf57b9aa70a633a81fc532029ab4a51800663 100644 (file)
--- a/src/internal/poll/sendfile_unix.go
+++ b/src/internal/poll/sendfile_unix.go
@@ -28,7 +28,7 @@ import (
 // has not modified the source or destination,
 // and the caller should perform the copy using a fallback implementation.
 func SendFile(dstFD *FD, src int, size int64) (n int64, err error, handled bool) {
-       if runtime.GOOS == "linux" {
+       if goos := runtime.GOOS; goos == "linux" || goos == "android" {
                // Linux's sendfile doesn't require any setup:
                // It sends from the current position of the source file and
                // updates the position of the source after sending.
@@ -124,7 +124,7 @@ func sendFile(dstFD *FD, src int, offset *int64, size int64) (written int64, err
 
 func sendFileChunk(dst, src int, offset *int64, size int, written int64) (n int, err error) {
        switch runtime.GOOS {
-       case "linux":
+       case "linux", "android":
                // The offset is always nil on Linux.
                n, err = syscall.Sendfile(dst, src, offset, size)
        case "solaris", "illumos":