Split unistd.c file into sysconf.c and sleep.c.

c/src/exec/posix/src/Makefile.in

@@ -83,8 +83,8 @@ TIMER_C_PIECES=ptimer ptimer1
 C_PIECES = adasupp $(CANCEL_C_PIECES) $(CONDITION_VARIABLE_C_PIECES) \
     $(ID_C_PIECES) $(KEY_C_PIECES) $(MESSAGE_QUEUE_C_PIECES) \
     $(MUTEX_C_PIECES) $(PTHREAD_C_PIECES) \
-    $(PSIGNAL_C_PIECES) sched $(SEMAPHORE_C_PIECES) \
-    $(TIME_C_PIECES) $(TIMER_C_PIECES) types unistd $(ENOSYS_C_PIECES) \
+    $(PSIGNAL_C_PIECES) sched $(SEMAPHORE_C_PIECES) sleep sysconf \
+    $(TIME_C_PIECES) $(TIMER_C_PIECES) types $(ENOSYS_C_PIECES) \
     $(BUILD_FOR_NOW_C_PIECES)
 
 C_FILES = $(C_PIECES:%=%.c)

c/src/exec/posix/src/sleep.c

@@ -0,0 +1,27 @@
+/*
+ *  3.4.3 Delay Process Execution, P1003.1b-1993, p. 81
+ *
+ *  $Id$
+ */
+
+#include <time.h>
+#include <unistd.h>
+
+#include <rtems/system.h>
+
+
+unsigned int sleep(
+  unsigned int seconds
+)
+{
+  /* XXX can we get away with this implementation? */
+  struct timespec tp;
+  struct timespec tm;
+
+  tp.tv_sec = seconds;
+  tp.tv_nsec = 0;
+
+  nanosleep( &tp, &tm );
+
+  return tm.tv_sec;       /* seconds remaining */
+}