minix/lib/libsys/sys_safecopy.c

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#include "syslib.h"
#include <minix/safecopies.h>
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int sys_safecopyfrom(endpoint_t src_e,
cp_grant_id_t gr_id, vir_bytes offset,
vir_bytes address, size_t bytes)
{
/* Transfer a block of data for which the other process has previously
* given permission.
*/
message copy_mess;
copy_mess.SCP_FROM_TO = src_e;
copy_mess.SCP_GID = gr_id;
copy_mess.SCP_OFFSET = (long) offset;
copy_mess.SCP_ADDRESS = (char *) address;
copy_mess.SCP_BYTES = (long) bytes;
/* for older kernels that still need the 'seg' field
* provide the right value.
*/
copy_mess.SCP_SEG_OBSOLETE = D;
return(_kernel_call(SYS_SAFECOPYFROM, &copy_mess));
}
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int sys_safecopyto(endpoint_t dst_e,
cp_grant_id_t gr_id, vir_bytes offset,
vir_bytes address, size_t bytes)
{
/* Transfer a block of data for which the other process has previously
* given permission.
*/
message copy_mess;
copy_mess.SCP_FROM_TO = dst_e;
copy_mess.SCP_GID = gr_id;
copy_mess.SCP_OFFSET = (long) offset;
copy_mess.SCP_ADDRESS = (char *) address;
copy_mess.SCP_BYTES = (long) bytes;
/* for older kernels that still need the 'seg' field
* provide the right value.
*/
copy_mess.SCP_SEG_OBSOLETE = D;
return(_kernel_call(SYS_SAFECOPYTO, &copy_mess));
}