linux-user: add inotify_init1 syscall support

New syscall which gets actively used when you have a
fresh kernel.

Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

configure

@@ -1629,6 +1629,21 @@ if compile_prog "" "" ; then
   inotify=yes
 fi
 
+inotify1=no
+cat > $TMPC << EOF
+#include <sys/inotify.h>
+
+int
+main(void)
+{
+    /* try to start inotify */
+    return inotify_init1(0);
+}
+EOF
+if compile_prog "" "" ; then
+  inotify1=yes
+fi
+
 # check if utimensat and futimens are supported
 utimens=no
 cat > $TMPC << EOF
@@ -2136,6 +2151,9 @@ fi
 if test "$inotify" = "yes" ; then
   echo "CONFIG_INOTIFY=y" >> $config_host_mak
 fi
+if test "$inotify1" = "yes" ; then
+  echo "CONFIG_INOTIFY1=y" >> $config_host_mak
+fi
 if test "$byteswap_h" = "yes" ; then
   echo "CONFIG_BYTESWAP_H=y" >> $config_host_mak
 fi

linux-user/syscall.c

@@ -506,9 +506,18 @@ static int sys_inotify_rm_watch(int fd, int32_t wd)
   return (inotify_rm_watch(fd, wd));
 }
 #endif
+#ifdef CONFIG_INOTIFY1
+#if defined(TARGET_NR_inotify_init1) && defined(__NR_inotify_init1)
+static int sys_inotify_init1(int flags)
+{
+  return (inotify_init1(flags));
+}
+#endif
+#endif
 #else
 /* Userspace can usually survive runtime without inotify */
 #undef TARGET_NR_inotify_init
+#undef TARGET_NR_inotify_init1
 #undef TARGET_NR_inotify_add_watch
 #undef TARGET_NR_inotify_rm_watch
 #endif /* CONFIG_INOTIFY  */
@@ -7055,6 +7064,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
         ret = get_errno(sys_inotify_init());
         break;
 #endif
+#if defined(TARGET_NR_inotify_init1) && defined(__NR_inotify_init1)
+    case TARGET_NR_inotify_init1:
+        ret = get_errno(sys_inotify_init1(arg1));
+        break;
+#endif
 #if defined(TARGET_NR_inotify_add_watch) && defined(__NR_inotify_add_watch)
     case TARGET_NR_inotify_add_watch:
         p = lock_user_string(arg2);