kernel/system/do_setgrant.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_SETGRANT
   3  *
   4  * The parameters for this kernel call are:
   5  *      SG_ADDR address of grant table in own address space
   6  *      SG_SIZE number of entries
   7  */
   8
   9 #include "../system.h"
  10 #include <minix/safecopies.h>
  11
  12 /*===========================================================================*
  13  *                              do_setgrant                                  *
  14  *===========================================================================*/
  15 PUBLIC int do_setgrant(m_ptr)
  16 message *m_ptr;
  17 {
  18         struct proc *rp;
  19         int r;
  20
  21         /* Who wants to set a parameter? */
  22         rp = proc_addr(who_p);
  23
  24         /* Copy grant table set in priv. struct. */
  25         if (RTS_ISSET(rp, NO_PRIV) || !(priv(rp))) {
  26                 r = EPERM;
  27         } else {
  28                 _K_SET_GRANT_TABLE(rp,
  29                         (vir_bytes) m_ptr->SG_ADDR,
  30                         m_ptr->SG_SIZE);
  31                 r = OK;
  32         }
  33
  34         return r;
  35 }