seccomp: Use own seccomp_metadata_t type

On fedora rawhide seccomp_metadata for some
reason is not defined (while in kernel it introduced
together with PTRACE_SECCOMP_GET_METADATA). So
lets do a trick for a while -- define own alias.
Once system headers get settled down we might find
more suitable solution. Because it's a part of kernel
API we're on the safe side.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/include/uapi/ptrace.h

@@ -52,13 +52,17 @@
 
 #ifndef PTRACE_SECCOMP_GET_METADATA
 # define PTRACE_SECCOMP_GET_METADATA	0x420d
+#endif /* PTRACE_SECCOMP_GET_METADATA */
 
-struct seccomp_metadata {
+/*
+ * struct seccomp_metadata is not yet
+ * settled down well in headers so use
+ * own identical definition for a while.
+ */
+typedef struct {
 	uint64_t	filter_off;	/* Input: which filter */
 	uint64_t	flags;		/* Output: filter's flags */
-};
-
-#endif /* PTRACE_SECCOMP_GET_METADATA */
+} seccomp_metadata_t;
 
 #ifdef PTRACE_EVENT_STOP
 # if PTRACE_EVENT_STOP == 7 /* Bad value from Linux 3.1-3.3, fixed in 3.4 */

criu/seccomp.c

@@ -131,7 +131,7 @@ int seccomp_dump_thread(pid_t tid_real, ThreadCoreEntry *thread_core)
 
 static int collect_filter(struct seccomp_entry *entry)
 {
-	struct seccomp_metadata meta_buf, *meta = &meta_buf;
+	seccomp_metadata_t meta_buf, *meta = &meta_buf;
 	struct seccomp_filter_chain *chain, *prev;
 	struct sock_filter buf[BPF_MAXINSNS];
 	size_t i;