check for _POSIX_C_SOURCE instead of __USE_POSIX*

check for _GNU_SOURCE as well as sd_event_child_handler_t needs to be
defined correctly while compiling systemd

diff --git a/src/systemd/sd-event.h b/src/systemd/sd-event.h
index cc26b7df553b2499b33bb5530e52477d33025b24..f8cb895660516b839dd8bd39c6ab25a640429321 100644 (file)
--- a/src/systemd/sd-event.h
+++ b/src/systemd/sd-event.h
@@ -69,7 +69,7 @@ typedef int (*sd_event_handler_t)(sd_event_source *s, void *userdata);
 typedef int (*sd_event_io_handler_t)(sd_event_source *s, int fd, uint32_t revents, void *userdata);
 typedef int (*sd_event_time_handler_t)(sd_event_source *s, uint64_t usec, void *userdata);
 typedef int (*sd_event_signal_handler_t)(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata);
-#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
+#if defined _GNU_SOURCE || _POSIX_C_SOURCE >= 199309L
 typedef int (*sd_event_child_handler_t)(sd_event_source *s, const siginfo_t *si, void *userdata);
 #else
 typedef void* sd_event_child_handler_t;