include/pidfd-utils: small cleanup

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/include/pidfd-utils.h b/include/pidfd-utils.h
index cc8aa5788e4675b2a55a05c5849f9e0584e0b6cc..593346576b7e0bf958ff38247f7388cdcea46d0e 100644 (file)
--- a/include/pidfd-utils.h
+++ b/include/pidfd-utils.h
@@ -1,9 +1,10 @@
 #ifndef UTIL_LINUX_PIDFD_UTILS
 #define UTIL_LINUX_PIDFD_UTILS
 
-#if defined (__linux__)
+#if defined(__linux__) && defined(SYS_pidfd_send_signal)
 # include <sys/types.h>
 # include <sys/syscall.h>
+
 # ifndef HAVE_PIDFD_OPEN
 static inline int pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
                                    unsigned int flags)
@@ -11,13 +12,15 @@ static inline int pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
        return syscall(SYS_pidfd_send_signal, pidfd, sig, info, flags);
 }
 # endif
+
 # ifndef HAVE_PIDFD_SEND_SIGNAL
 static inline int pidfd_open(pid_t pid, unsigned int flags)
 {
        return syscall(SYS_pidfd_open, pid, flags);
 }
 # endif
+
 # define UL_HAVE_PIDFD 1
-#endif
 
-#endif
+#endif /* __linux__ && SYS_pidfd_send_signal */
+#endif /* UTIL_LINUX_PIDFD_UTILS */