[PATCH] Include sys/glibc-syscalls.h instead of inexistent sys/io.h on Android.

[Stefan Tauner]

This won't make raw I/O work magically but at least it would provide iopl()
if some driver requires it and there is no better alternative currently.

Signed-off-by: Stefan Tauner 
---
 hwaccess.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/hwaccess.h b/hwaccess.h
index 29a29b0..f1ad807 100644
--- a/hwaccess.h
+++ b/hwaccess.h
@@ -203,8 +203,14 @@ cpu_to_be(64)

/* sys/io.h provides iopl(2) and x86 I/O port access functions (inb, outb etc).
  * It is included in glibc (thus available also on debian/kFreeBSD) but also in other libcs that mimic glibc,
- * e.g. musl and uclibc. */
-#if defined(__linux__) || defined(__GLIBC__)
+ * e.g. musl and uclibc. Because we cannot detect the clib or existence of the header or of the instructions
+ * themselves safely in here we need some heuristic below:
+ * On Android we don't have the header and no way for I/O port access at all. However, sys/glibc-syscalls.h
+ * refers to an iopl implementation and we therefore include at least that one for now. On non-Android we assume
+ * that a Linux system's libc has a suitable sys/io.h or we depend on glibc to offer it. */
+#if defined(__ANDROID__)
+#include <sys/glibc-syscalls.h>
+#elif defined(__linux__) || defined(__GLIBC__)
 #include <sys/io.h>
 #endif