test/fsnotify: Skip fsnotify test if sys/fanotify.h not available

Fix build on Termux (Android). Most android devices don't have
<sys/fanotify.h> on Termux. Skip the test if it's not available.

Reported-by: Dwiky Rizky Ananditya <[email protected]>
Tested-by: Dwiky Rizky Ananditya <[email protected]>
Signed-off-by: Alviro Iskandar Setiawan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: alviroiskandar

configure

@@ -419,6 +419,22 @@ fi
 print_config "nolibc support" "$liburing_nolibc";
 #############################################################################
 
+####################################################
+# Most Android devices don't have sys/fanotify.h
+has_fanotify="no"
+cat > $TMPC << EOF
+#include <sys/fanotify.h>
+int main(void)
+{
+  return 0;
+}
+EOF
+if compile_prog "" "" "fanotify"; then
+  has_fanotify="yes"
+fi
+print_config "has_fanotify" "$has_fanotify"
+####################################################
+
 if test "$liburing_nolibc" = "yes"; then
   output_sym "CONFIG_NOLIBC"
 fi
@@ -452,6 +468,9 @@ fi
 if test "$nvme_uring_cmd" = "yes"; then
   output_sym "CONFIG_HAVE_NVME_URING"
 fi
+if test "$has_fanotify" = "yes"; then
+  output_sym "CONFIG_HAVE_FANOTIFY"
+fi
 
 echo "CC=$cc" >> $config_host_mak
 print_config "CC" "$cc"

test/fsnotify.c

@@ -2,6 +2,10 @@
 /*
  * Description: test fsnotify access off O_DIRECT read
  */
+
+#include "helpers.h"
+
+#ifdef CONFIG_HAVE_FANOTIFY
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -11,7 +15,6 @@
 #include <sys/wait.h>
 
 #include "liburing.h"
-#include "helpers.h"
 
 int main(int argc, char *argv[])
 {
@@ -99,3 +102,11 @@ int main(int argc, char *argv[])
 		unlink(fname);
 	return err;
 }
+
+#else /* #ifdef CONFIG_HAVE_FANOTIFY */
+
+int main(void)
+{
+	return T_EXIT_SKIP;
+}
+#endif /* #ifdef CONFIG_HAVE_FANOTIFY */