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Annotation of researchv9/jerq/sgs/inc/sdpsrc/lo/readpage.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * static char ID_rdpagc[] = "@(#) readpage.c: 1.2 11/10/82";
                      3:  */
                      4: 
                      5: readpage(itemid, framenbr)
                      6: int framenbr;
                      7: ITEMID itemid;
                      8: {
                      9: 
                     10:        register int index;
                     11:        register HEADER *gframe;
                     12:        int spacenbr, bytesread;
                     13:        char file_name[NAMELENG];
                     14:        long offset, pagenbr;
                     15: 
                     16:        pagenbr  = XTRCTPN(itemid);
                     17:        spacenbr = XTRCTSP(itemid);
                     18: 
                     19:        gframe = &global_frames[spacenbr];
                     20:        
                     21:        offset = 0L;
                     22:        for( index = 0; index < gframe->numbfiles; index++ ) {
                     23:                if( pagenbr < (offset + gframe->filesize[index]) )
                     24:                        break;
                     25:                offset += gframe->filesize[index];
                     26:                }
                     27:        if( index == gframe->numbfiles )
                     28:                return( fatal("attempt to read page outside of address space") );
                     29:        
                     30:        offset = pagenbr - offset;
                     31:        
                     32:        if( gframe->filedes[index] == NOTMADE )
                     33:                return( fatal("attempt to read from nonexistant file") );
                     34:        
                     35:        if( gframe->filedes[index] == CLOSED ) {
                     36:                sprintf(file_name, "%s/%s%d", direct_names[spacenbr], TEMPLATE, index);
                     37:                if( (gframe->filedes[index] = open(file_name,RW)) < 0 )
                     38:                        return( fatal("unable to open SDP file for read") );
                     39:                }
                     40:        
                     41:        if( lseek(gframe->filedes[index], offset*PAGESIZE, 0) < 0 )
                     42:                return( fatal("lseek failure on SDP file") );
                     43:        
                     44:        SDP_read++;
                     45:        if( dflag > 15 )
                     46:                fprintf( stderr, " r%02d ", framenbr );
                     47: 
                     48:        if( (bytesread =
                     49:                read(gframe->filedes[index], manager[framenbr].frame_pntr, PAGESIZE)) < 0 )
                     50:                return( fatal("read feilure on SDP file") );
                     51: 
                     52:        manager[framenbr].page_id = itemid;
                     53:        
                     54:        partusage[manager[framenbr].partition]++;
                     55: #if DPARTRESET == -1
                     56:        partusage[num_partitions]++;
                     57: #else
                     58:        if( ++partusage[num_partitions] >= partreset )
                     59:                repartition();
                     60: #endif
                     61: 
                     62:        return( bytesread );
                     63: }

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