Index: uspace/lib/c/include/sys/time.h
===================================================================
--- uspace/lib/c/include/sys/time.h	(revision 36f0738ce13f32ad07d7932ca18f677cab815660)
+++ uspace/lib/c/include/sys/time.h	(revision 1d6dd2a62370f8442aef510558ad86b6439e6653)
@@ -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__,