Usleep implementation based on select.

lib/posix/Makefile

@@ -101,6 +101,7 @@ OBJECTS	= \
 	$(LIBRARY)(priority.o) \
 	$(LIBRARY)(readlink.o) \
 	$(LIBRARY)(symlink.o) \
+	$(LIBRARY)(usleep.o) \
 
 $(LIBRARY):	$(OBJECTS)
 	aal cr $@ *.o
@@ -388,3 +389,6 @@ $(LIBRARY)(lstat.o):	lstat.c
 $(LIBRARY)(symlink.o):	symlink.c
 	$(CC1) symlink.c
 
+$(LIBRARY)(usleep.o):	usleep.c
+	$(CC1) usleep.c
+

lib/posix/usleep.c

@@ -0,0 +1,18 @@
+/*
+lib/posix/usleep.c
+*/
+
+#include <unistd.h>
+#include <sys/select.h>
+#include <sys/time.h>
+
+int usleep(useconds_t useconds)
+{
+	int r;
+	struct timeval tv;
+
+	tv.tv_sec= useconds/1000000;
+	tv.tv_usec= useconds % 1000000;
+	r= select(0, NULL, NULL, NULL, &tv);
+	return r;
+}