[PATCH master 3/3] sandbox: os: tap: make it compile with musl

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

musl not ship a definition of IFF_TAP. As this is ABI set in stone,
let's just duplicate the constant we need and use them as fallback, when
<linux/if_tun.h> is missing.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 arch/sandbox/os/tap.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/sandbox/os/tap.c b/arch/sandbox/os/tap.c
index 83b97ffd49c7..fbb20f2fa80f 100644
--- a/arch/sandbox/os/tap.c
+++ b/arch/sandbox/os/tap.c
@@ -21,10 +21,20 @@
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
-#include <linux/if.h>
-#include <linux/if_tun.h>
+#include <net/if.h>
 #include <string.h>
 
+#ifdef __has_include
+#  if !__has_include(<linux/if_tun.h>)
+#    define IFF_TAP		0x0002
+#    define IFF_NO_PI	0x1000
+#    define TUNSETIFF	_IOW('T', 202, int)
+#  endif
+#endif
+#ifndef IFF_TAP
+#  include <linux/if_tun.h>
+#endif
+
 int tap_alloc(const char *dev)
 {
 	struct ifreq ifr;
-- 
2.39.5