Index: uspace/lib/c/include/sys/time.h
===================================================================
--- uspace/lib/c/include/sys/time.h	(revision facacc712e3d87d7301754b109c9582ef1ef29e4)
+++ uspace/lib/c/include/sys/time.h	(revision 58e4d85ce498861509fd56f58413b1cd38ab29f6)
@@ -84,13 +84,13 @@
 
 extern void udelay(useconds_t);
-extern int usleep(useconds_t);
+extern errno_t usleep(useconds_t);
 
 extern time_t mktime(struct tm *);
-extern int time_utc2tm(const time_t, struct tm *);
-extern int time_utc2str(const time_t, char *);
+extern errno_t time_utc2tm(const time_t, struct tm *);
+extern errno_t time_utc2str(const time_t, char *);
 extern void time_tm2str(const struct tm *, char *);
-extern int time_tv2tm(const struct timeval *, struct tm *);
-extern int time_local2tm(const time_t, struct tm *);
-extern int time_local2str(const time_t, char *);
+extern errno_t time_tv2tm(const struct timeval *, struct tm *);
+extern errno_t time_local2tm(const time_t, struct tm *);
+extern errno_t time_local2str(const time_t, char *);
 extern double difftime(time_t, time_t);
 extern size_t strftime(char *__restrict__, size_t, const char *__restrict__,