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Annotation of 42BSD/ingres/source/iutil/checkadmin.c, revision 1.1.1.1

1.1       root        1: # include      <ingres.h>
                      2: # include      <version.h>
                      3: # include      <access.h>
                      4: # include      <sccs.h>
                      5: 
                      6: SCCSID(@(#)checkadmin.c        7.1     2/5/81)
                      7: 
                      8: /*
                      9: **  CHECKADMIN -- check admin file version, etc.
                     10: **
                     11: **     The checks for database version code and whatnot are
                     12: **     factored out into this routine.  When this routine returns,
                     13: **     the admin file should be legible to this program.
                     14: **     If the admin file is not legible, it will syserr.
                     15: **
                     16: **     Parameters:
                     17: **             fd -- open file descriptor for admin file.  Only
                     18: **                     read access is required.
                     19: **
                     20: **     Returns:
                     21: **             nothing if ok.
                     22: **             not at all (or via syserr) if not ok.
                     23: **
                     24: **     Side Effects:
                     25: **             The Admin.adhdr struct will be filled in.
                     26: */
                     27: 
                     28: checkadmin(fd)
                     29: register int   fd;
                     30: {
                     31:        register int    i;
                     32:        register int    k;
                     33: 
                     34:        i = ((char *) &Admin.adhdr.adversion) - ((char *) &Admin.adhdr);
                     35:        if (read(fd, (char *) &Admin.adhdr, i) != i)
                     36:                syserr("readadmin: admin read err 1");
                     37:        if (!bitset(A_NEWFMT, Admin.adhdr.adflags))
                     38:                syserr("readadmin: cannot use old databases");
                     39: 
                     40:        /* read in remainder of admin header */
                     41:        i = sizeof Admin.adhdr;
                     42:        if (Admin.adhdr.adlength < i)
                     43:                i = Admin.adhdr.adlength;
                     44:        i -= ((char *) &Admin.adhdr.adversion) - ((char *) &Admin.adhdr);
                     45:        if (i <= 0)
                     46:                syserr("readadmin: adlen=%d, hdrsz=%d, ct=%d", Admin.adhdr.adlength, sizeof Admin.adhdr, i);
                     47:        if ((k = read(fd, (char *) &Admin.adhdr.adversion, i)) != i)
                     48:                syserr("readadmin: admin read err 2, i=%d k=%d", i, k);
                     49: 
                     50:        /* check versions here */
                     51:        if (Admin.adhdr.adversion != DBVERCODE)
                     52:                syserr("cannot handle code %d databases (current code is %d)",
                     53:                        Admin.adhdr.adversion, DBVERCODE);
                     54:        if (Admin.adhdr.adreldsz != sizeof Admin.adreld)
                     55:                syserr("checkadmin: descriptor size mismatch, dec=%d, actual=%d",
                     56:                        Admin.adhdr.adreldsz, sizeof Admin.adreld);
                     57: 
                     58:        /* get to beginning of descriptors */
                     59:        if (lseek(fd, (long) Admin.adhdr.adlength, 0) < 0)
                     60:                syserr("checkadmin: seek");
                     61: 
                     62:        /* read the descriptors */
                     63:        if (read(fd, (char *) &Admin.adreld, Admin.adhdr.adreldsz) != Admin.adhdr.adreldsz)
                     64:                syserr("checkadmin: reld read sz=%d", Admin.adhdr.adreldsz);
                     65:        if (read(fd, (char *) &Admin.adattd, Admin.adhdr.adattdsz) != Admin.adhdr.adattdsz)
                     66:                syserr("checkadmin: attd read sz=%d", Admin.adhdr.adattdsz);
                     67: }

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