4.3BSD - /usr/ingres/source/ctlmod/av_files.c

   1: # include   <ingres.h>
   2: # include   <aux.h>
   3: # include   <opsys.h>
   4: # include   "ctlmod.h"
   5: # include   <sccs.h>
   6: 
   7: SCCSID(@(#)av_files.c	8.1	12/31/84)
   8: 
   9: /*
  10: **  AV_FILES -- return number of files available for user files.
  11: **
  12: **	Takes NOFILE and reduces it by the number of files that are
  13: **	open or could be open (for the catalog descriptors).
  14: **
  15: **	Parameters:
  16: **		none.
  17: **
  18: **	Returns:
  19: **		the number of available file descriptor to play with.
  20: **
  21: **	Side Effects:
  22: **		none.
  23: */
  24: 
  25: extern struct desxx Desxx[];
  26: 
  27: av_files()
  28: {
  29:     auto long       fopn;
  30:     register int        nopn;
  31:     register int        i;
  32:     register struct desxx   *p;
  33: 
  34:     markopen(&fopn);
  35:     nopn = 0;
  36:     for (i = 0; i < 32; i++)
  37:     {
  38:         if (bitset(1 << i, fopn))
  39:             nopn++;
  40:     }
  41: 
  42:     /* now scan the descriptor cache */
  43:     for (p = Desxx; p->cach_relname != NULL; p++)
  44:     {
  45:         if (p->cach_alias != NULL)
  46:             continue;
  47:         if (p->cach_desc->relopn == 0)
  48:             nopn++;
  49:     }
  50: 
  51:     return (NOFILE - nopn);
  52: }

Defined functions