lib/libsys/sys_safecopy.c

   1
   2 #include "syslib.h"
   3
   4 #include <minix/safecopies.h>
   5
   6 int sys_safecopyfrom(endpoint_t src_e,
   7         cp_grant_id_t gr_id, vir_bytes offset,
   8         vir_bytes address, size_t bytes)
   9 {
  10 /* Transfer a block of data for which the other process has previously
  11  * given permission.
  12  */
  13
  14   message copy_mess;
  15
  16   copy_mess.SCP_FROM_TO = src_e;
  17   copy_mess.SCP_GID = gr_id;
  18   copy_mess.SCP_OFFSET = (long) offset;
  19   copy_mess.SCP_ADDRESS = (char *) address;
  20   copy_mess.SCP_BYTES = (long) bytes;
  21
  22   /* for older kernels that still need the 'seg' field
  23    * provide the right value.
  24    */
  25   copy_mess.SCP_SEG_OBSOLETE = D_OBSOLETE;
  26
  27   return(_kernel_call(SYS_SAFECOPYFROM, &copy_mess));
  28
  29 }
  30
  31 int sys_safecopyto(endpoint_t dst_e,
  32         cp_grant_id_t gr_id, vir_bytes offset,
  33         vir_bytes address, size_t bytes)
  34 {
  35 /* Transfer a block of data for which the other process has previously
  36  * given permission.
  37  */
  38
  39   message copy_mess;
  40
  41   copy_mess.SCP_FROM_TO = dst_e;
  42   copy_mess.SCP_GID = gr_id;
  43   copy_mess.SCP_OFFSET = (long) offset;
  44   copy_mess.SCP_ADDRESS = (char *) address;
  45   copy_mess.SCP_BYTES = (long) bytes;
  46
  47   /* for older kernels that still need the 'seg' field
  48    * provide the right value.
  49    */
  50   copy_mess.SCP_SEG_OBSOLETE = D_OBSOLETE;
  51
  52   return(_kernel_call(SYS_SAFECOPYTO, &copy_mess));
  53
  54 }