minix/test/safecopy/grantor.c
Cristiano Giuffrida c5b309ff07 Merge of Wu's GSOC 09 branch (src.20090525.r4372.wu)
Main changes:
- COW optimization for safecopy.
- safemap, a grant-based interface for sharing memory regions between processes.
- Integration with safemap and complete rework of DS, supporting new data types
  natively (labels, memory ranges, memory mapped ranges).
- For further information:
  http://wiki.minix3.org/en/SummerOfCode2009/MemoryGrants

Additional changes not included in the original Wu's branch:
- Fixed unhandled case in VM when using COW optimization for safecopy in case
  of a block that has already been shared as SMAP.
- Better interface and naming scheme for sys_saferevmap and ds_retrieve_map
  calls.
- Better input checking in syslib: check for page alignment when creating
  memory mapping grants.
- DS notifies subscribers when an entry is deleted.
- Documented the behavior of indirect grants in case of memory mapping.
- Test suite in /usr/src/test/safeperf|safecopy|safemap|ds/* reworked
  and extended.
- Minor fixes and general cleanup.
- TO-DO: Grant ids should be generated and managed the way endpoints are to make
sure grant slots are never misreused.
2010-01-14 15:24:16 +00:00

59 lines
1.6 KiB
C

#include "inc.h"
char buf_buf[BUF_SIZE + CLICK_SIZE];
/* SEF functions and variables. */
FORWARD _PROTOTYPE( void sef_local_startup, (void) );
/*===========================================================================*
* main *
*===========================================================================*/
int main(int argc, char **argv)
{
endpoint_t ep_self, ep_requestor;
int fid_send, fid_get;
cp_grant_id_t gid;
char *buf;
int i;
/* SEF local startup. */
env_setargs(argc, argv);
sef_local_startup();
/* Prepare work. */
buf = (char*) CLICK_CEIL(buf_buf);
fid_send = open(FIFO_GRANTOR, O_WRONLY);
fid_get = open(FIFO_REQUESTOR, O_RDONLY);
if(fid_get < 0 || fid_send < 0) {
printf("GRANTOR: can't open fifo files.\n");
return 1;
}
buf[0] = BUF_START;
/* Get the requestor's endpoint. */
read(fid_get, &ep_requestor, sizeof(ep_requestor));
dprint("GRANTOR: getting requestor's endpoint: %d\n", ep_requestor);
/* Grant. */
gid = cpf_grant_direct(ep_requestor, (long)buf, BUF_SIZE,
CPF_READ | CPF_WRITE);
ep_self = getprocnr();
dprint("GRANTOR: sending my endpoint %d and gid %d\n", ep_self, gid);
write(fid_send, &ep_self, sizeof(ep_self));
write(fid_send, &gid, sizeof(gid));
/* Wait till requestor is done. */
FIFO_WAIT(fid_get);
return 0;
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
PRIVATE void sef_local_startup()
{
/* Let SEF perform startup. */
sef_startup();
}