lib/libsys/sys_safemap.c

   1
   2 #include "syslib.h"
   3
   4 #include <minix/safecopies.h>
   5
   6 /*===========================================================================*
   7  *                              sys_safemap                                  *
   8  *===========================================================================*/
   9 PUBLIC 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 my_seg, 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_SEG = (void*) my_seg;
  23         copy_mess.SMAP_ADDRESS = my_address;
  24         copy_mess.SMAP_BYTES = bytes;
  25         copy_mess.SMAP_FLAG = writable;
  26
  27         return(_kernel_call(SYS_SAFEMAP, &copy_mess));
  28
  29 }
  30
  31 /*===========================================================================*
  32  *                           sys_saferevmap_gid                              *
  33  *===========================================================================*/
  34 PUBLIC int sys_saferevmap_gid(cp_grant_id_t grant)
  35 {
  36 /* Grantor revokes safemap by grant id. */
  37         message copy_mess;
  38
  39         copy_mess.SMAP_FLAG = 1;
  40         copy_mess.SMAP_GID = grant;
  41
  42         return(_kernel_call(SYS_SAFEREVMAP, &copy_mess));
  43 }
  44
  45 /*===========================================================================*
  46  *                          sys_saferevmap_addr                              *
  47  *===========================================================================*/
  48 PUBLIC int sys_saferevmap_addr(vir_bytes addr)
  49 {
  50 /* Grantor revokes safemap by address. */
  51         message copy_mess;
  52
  53         copy_mess.SMAP_FLAG = 0;
  54         copy_mess.SMAP_GID = addr;
  55
  56         return(_kernel_call(SYS_SAFEREVMAP, &copy_mess));
  57 }
  58
  59 /*===========================================================================*
  60  *                              sys_safeunmap                                *
  61  *===========================================================================*/
  62 PUBLIC int sys_safeunmap(int my_seg, vir_bytes my_address)
  63 {
  64 /* Requestor unmaps safemap. */
  65         message copy_mess;
  66
  67         copy_mess.SMAP_SEG = (void*) my_seg;
  68         copy_mess.SMAP_ADDRESS = my_address;
  69
  70         return(_kernel_call(SYS_SAFEUNMAP, &copy_mess));
  71 }
  72