minix/lib/libsys/sys_safemap.c

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#include "syslib.h"
#include <minix/safecopies.h>
/*===========================================================================*
* sys_safemap *
*===========================================================================*/
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int sys_safemap(endpoint_t grantor, cp_grant_id_t grant,
vir_bytes grant_offset, vir_bytes my_address,
size_t bytes, int my_seg, int writable)
{
/* Map a block of data for which the other process has previously
* granted permission.
*/
message copy_mess;
copy_mess.SMAP_EP = grantor;
copy_mess.SMAP_GID = grant;
copy_mess.SMAP_OFFSET = grant_offset;
copy_mess.SMAP_SEG = (void*) my_seg;
copy_mess.SMAP_ADDRESS = my_address;
copy_mess.SMAP_BYTES = bytes;
copy_mess.SMAP_FLAG = writable;
return(_kernel_call(SYS_SAFEMAP, &copy_mess));
}
/*===========================================================================*
* sys_saferevmap_gid *
*===========================================================================*/
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int sys_saferevmap_gid(cp_grant_id_t grant)
{
/* Grantor revokes safemap by grant id. */
message copy_mess;
copy_mess.SMAP_FLAG = 1;
copy_mess.SMAP_GID = grant;
return(_kernel_call(SYS_SAFEREVMAP, &copy_mess));
}
/*===========================================================================*
* sys_saferevmap_addr *
*===========================================================================*/
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int sys_saferevmap_addr(vir_bytes addr)
{
/* Grantor revokes safemap by address. */
message copy_mess;
copy_mess.SMAP_FLAG = 0;
copy_mess.SMAP_GID = addr;
return(_kernel_call(SYS_SAFEREVMAP, &copy_mess));
}
/*===========================================================================*
* sys_safeunmap *
*===========================================================================*/
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int sys_safeunmap(int my_seg, vir_bytes my_address)
{
/* Requestor unmaps safemap. */
message copy_mess;
copy_mess.SMAP_SEG = (void*) my_seg;
copy_mess.SMAP_ADDRESS = my_address;
return(_kernel_call(SYS_SAFEUNMAP, &copy_mess));
}