例 5-5 例 5-4をAlphaシステムで実行するのに必要なソース・コードの変更

     #include  <ssdef.h>
     #include  <stdio.h>
     #include  <stsdef.h>
     #include  <string.h>
     #include  <stdlib.h>
     #include  <descrip.h>
     #include  <dvidef.h>
     #include  <rms.h>
     #include  <secdef.h>
     #include  <syidef.h> 【1】

     char buffer[512];  【2】
     char *filename = "maptest.dat";
     struct FAB fab;

     long  cpu_pagesize;  【3】

     struct itm {                      /* item list */
         short int     buflen;  /* length of buffer in bytes */
         short int  item_code;  /* symbolic item code */
         long          bufadr;  /* address of return value buffer */
         long       retlenadr;  /* address of return value buffer length */
       } itmlst[2];  【4】

     main( argc, argv )
     int argc;
     char *argv[];
     {
          int    i;
          int    status = 0;
          long   flags = SEC$M_EXPREG;
          long   inadr[2];
          long   retadr[2];
          int    fileChannel;
          char  *mapped_section;

     /********  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;

     /**********  obtain the page size at run time  ****************/

          itmlst[0].buflen =  4;
          itmlst[0].item_code = SYI$_PAGE_SIZE;
          itmlst[0].bufadr =  &cpu_pagesize;
          itmlst[0].retlenadr = &cpu_pagesize_len;
          itmlst[1].buflen = 0;
          itmlst[1].item_code = 0;

    【5】 status = sys$getsyiw( 0, 0, 0, &itmlst, 0, 0, 0 );

          if( status & STS$M_SUCCESS )
          {
               printf("getsyi succeeds, page size = %d\n",cpu_pagesize);
          }
          else
          {
               printf("getsyi fails\n");
               exit( status );
          }

     /**********  create and map the section  ****************/

          inadr[0] = &buffer[0];
          inadr[1] = &buffer[cpu_pagesize - 1];  【6】

          printf("address of buffer = %u\n", inadr[0] );

          status = SYS$CRMPSC(&inadr, /* inadr=address target for map */
                             &retadr, /* retadr= what was actually mapped */
                                   0, /* acmode  */
                                   0, /* no flags to set  */
                                   0, /* gsdnam, only for global sections */
                                   0, /* ident, only for global sections */
                                   0, /* relpag, only for global sections */
                         fileChannel, /* returned by SYS$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("start address returned =%u\n",retadr[0]);
          }
          else
          {
               printf("map failed\n");
               exit( status );
          }
     }


[ 本文に戻る ]