Added global variable boottime, prototype for do_stime, and table entry for

SYS_STIME.

kernel/glo.h

@@ -48,6 +48,7 @@ EXTERN int do_serial_debug;
 EXTERN endpoint_t who_e;		/* message source endpoint */
 EXTERN int who_p;			/* message source proc */
 EXTERN int sys_call_code;		/* kernel call number in SYSTEM */
+EXTERN time_t boottime;
 
 /* VM */
 EXTERN phys_bytes vm_base;

kernel/system.c

@@ -177,6 +177,7 @@ PRIVATE void initialize(void)
   /* Clock functionality. */
   map(SYS_TIMES, do_times);		/* get uptime and process times */
   map(SYS_SETALARM, do_setalarm);	/* schedule a synchronous alarm */
+  map(SYS_STIME, do_stime);		/* set the boottime */
 
   /* System control. */
   map(SYS_ABORT, do_abort);		/* abort MINIX */

kernel/system.h

@@ -173,6 +173,8 @@ _PROTOTYPE( int do_setalarm, (message *m_ptr) );
 #define do_setalarm do_unused
 #endif
 
+_PROTOTYPE( int do_stime, (message *m_ptr) );	
+
 _PROTOTYPE( int do_safecopy, (message *m_ptr) );	
 _PROTOTYPE( int do_vsafecopy, (message *m_ptr) );	
 _PROTOTYPE( int do_iopenable, (message *m_ptr) );