shared: Clean up includes

Split out of #37344.

src/shared/seccomp-util.c

@@ -1,35 +1,30 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
-#include <errno.h>
 #include <fcntl.h>
 #include <linux/seccomp.h>
-#include <stddef.h>
+#include <sched.h>
 #include <sys/mman.h>
 #include <sys/prctl.h>
 #include <sys/shm.h>
 #include <sys/stat.h>
 
-/* clang-format off */
-/* include missing_syscall_def.h earlier to make __SNR_foo mapped to __NR_foo. */
-#include "missing_syscall_def.h"
-#include <seccomp.h>
-/* clang-format on */
-
 #include "af-list.h"
 #include "alloc-util.h"
 #include "env-util.h"
 #include "errno-list.h"
 #include "log.h"
-#include "macro.h"
 #include "namespace-util.h"
 #include "nsflags.h"
 #include "nulstr-util.h"
+#include "parse-util.h"
 #include "process-util.h"
 #include "seccomp-util.h"
 #include "set.h"
 #include "string-util.h"
 #include "strv.h"
 
+#if HAVE_SECCOMP
+
 /* This array will be modified at runtime as seccomp_restrict_archs is called. */
 uint32_t seccomp_local_archs[] = {
 
@@ -2525,3 +2520,21 @@ int seccomp_suppress_sync(void) {
 
         return 0;
 }
+
+#endif
+
+bool seccomp_errno_or_action_is_valid(int n) {
+        return n == SECCOMP_ERROR_NUMBER_KILL || errno_is_valid(n);
+}
+
+int seccomp_parse_errno_or_action(const char *p) {
+        if (streq_ptr(p, "kill"))
+                return SECCOMP_ERROR_NUMBER_KILL;
+        return parse_errno(p);
+}
+
+const char* seccomp_errno_or_action_to_string(int num) {
+        if (num == SECCOMP_ERROR_NUMBER_KILL)
+                return "kill";
+        return errno_to_name(num);
+}