lib/libsys/sys_safemap.c

   1
   2 #include "syslib.h"
   3
   4 #include <minix/safecopies.h>
   5
   6 /*===========================================================================*
   7  *                              sys_safemap                                  *
   8  *===========================================================================*/
   9 int sys_safemap(endpoint_t grantor, cp_grant_id_t grant,
  10         vir_bytes grant_offset, vir_bytes my_address,
  11         size_t bytes, int writable)
  12 {
  13 /* Map a block of data for which the other process has previously
  14  * granted permission.
  15  */
  16
  17         message copy_mess;
  18
  19         copy_mess.SMAP_EP = grantor;
  20         copy_mess.SMAP_GID = grant;
  21         copy_mess.SMAP_OFFSET = grant_offset;
  22         copy_mess.SMAP_ADDRESS = my_address;
  23         copy_mess.SMAP_BYTES = bytes;
  24         copy_mess.SMAP_FLAG = writable;
  25
  26         copy_mess.SMAP_SEG_OBSOLETE = (void *) D_OBSOLETE;
  27
  28         return(_kernel_call(SYS_SAFEMAP, &copy_mess));
  29
  30 }
  31
  32 /*===========================================================================*
  33  *                           sys_saferevmap_gid                              *
  34  *===========================================================================*/
  35 int sys_saferevmap_gid(cp_grant_id_t grant)
  36 {
  37 /* Grantor revokes safemap by grant id. */
  38         message copy_mess;
  39
  40         copy_mess.SMAP_FLAG = 1;
  41         copy_mess.SMAP_GID = grant;
  42
  43         return(_kernel_call(SYS_SAFEREVMAP, &copy_mess));
  44 }
  45
  46 /*===========================================================================*
  47  *                          sys_saferevmap_addr                              *
  48  *===========================================================================*/
  49 int sys_saferevmap_addr(vir_bytes addr)
  50 {
  51 /* Grantor revokes safemap by address. */
  52         message copy_mess;
  53
  54         copy_mess.SMAP_FLAG = 0;
  55         copy_mess.SMAP_GID = addr;
  56
  57         return(_kernel_call(SYS_SAFEREVMAP, &copy_mess));
  58 }
  59
  60 /*===========================================================================*
  61  *                              sys_safeunmap                                *
  62  *===========================================================================*/
  63 int sys_safeunmap(vir_bytes my_address)
  64 {
  65 /* Requestor unmaps safemap. */
  66         message copy_mess;
  67
  68         copy_mess.SMAP_ADDRESS = my_address;
  69
  70         copy_mess.SMAP_SEG_OBSOLETE = (void *) D_OBSOLETE;
  71
  72         return(_kernel_call(SYS_SAFEUNMAP, &copy_mess));
  73 }
  74