例 5-3 拡張された仮想アドレス空間へのセクションのマッピング
#include <ssdef.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stsdef.h>
#include <descrip.h>
#include <dvidef.h>
#include <rms.h>
#include <secdef.h>
struct FAB fab;
char _align(page) buffer[1024];
char *filename = "maptest.dat";
main( argc, argv )
int argc;
char *argv[];
{
int status = 0;
long flags = SEC$M_EXPREG;
long inadr[2];
long retadr[2];
int fileChannel;
/******** create disk file to be mapped *************/
fab = cc$rms_fab;
fab.fab$l_fna = filename;
fab.fab$b_fns = strlen( filename );
fab.fab$l_fop = FAB$M_CIF | FAB$M_UFO; /* must be UFO */
status = sys$create( &fab );
if( status & STS$M_SUCCESS )
printf("%s opened\n",filename);
else
{
exit( status );
}
fileChannel = fab.fab$l_stv;
/********** create and map the section ****************/
inadr[0] = &buffer[0];
inadr[1] = &buffer[0];
status = SYS$CRMPSC( inadr, /* inadr=address target for map */
&retadr, /* retadr= what was actually mapped */
0, /* acmode */
flags, /* flags, with SEC$M_EXPREG bit set */
0, /* gsdnam, only for global sections */
0, /* ident, only for global sections */
0, /* relpag, only for global sections */
fileChannel, /* returned by SYS$CREATE */
0, /* pagcnt = size of sect. file used */
0, /* vbn = first block of file used */
0, /* prot = default okay */
0); /* page fault cluster size */
if( status & STS$M_SUCCESS )
{
printf("section mapped\n");
printf("retadr[0]=%u,retadr[1]=%u\n",retadr[0],retadr[1]);
}
else
{
printf("map failed\n");
exit( status );
}
}
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