c5b309ff07
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.
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
#include "inc.h"
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char buf_buf[BUF_SIZE + CLICK_SIZE];
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int fid_send, fid_get;
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/* SEF functions and variables. */
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FORWARD _PROTOTYPE( void sef_local_startup, (void) );
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/*===========================================================================*
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* main *
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*===========================================================================*/
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int main(int argc, char **argv)
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{
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endpoint_t ep_self, ep_requestor, ep_child;
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cp_grant_id_t gid;
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int i, r, pid;
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char *buf;
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int status;
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/* SEF local startup. */
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env_setargs(argc, argv);
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sef_local_startup();
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/* Prepare work. */
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buf = (char*) CLICK_CEIL(buf_buf);
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fid_send = open(FIFO_GRANTOR, O_WRONLY);
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fid_get = open(FIFO_REQUESTOR, O_RDONLY);
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if(fid_get < 0 || fid_send < 0) {
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printf("GRANTOR: can't open fifo files.\n");
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return 1;
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}
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/* Get the requestor's endpoint. */
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read(fid_get, &ep_requestor, sizeof(ep_requestor));
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dprint("GRANTOR: getting requestor's endpoint: %d\n", ep_requestor);
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/* Grant. */
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gid = cpf_grant_direct(ep_requestor, (long)buf, BUF_SIZE,
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CPF_READ | CPF_WRITE | CPF_MAP);
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ep_self = getprocnr();
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dprint("GRANTOR: sending my endpoint %d and gid %d\n", ep_self, gid);
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write(fid_send, &ep_self, sizeof(ep_self));
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write(fid_send, &gid, sizeof(gid));
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/* Test safemap. */
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buf[0] = 0;
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FIFO_NOTIFY(fid_send);
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FIFO_WAIT(fid_get);
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return 0;
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}
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/*===========================================================================*
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* sef_local_startup *
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*===========================================================================*/
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PRIVATE void sef_local_startup()
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{
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/* Let SEF perform startup. */
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sef_startup();
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}
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