sunos4/ppp_comp_vdcmd.c

   1 #include <sys/types.h>
   2 #include <sys/errno.h>
   3 #include <sys/conf.h>
   4 #include <sun/vddrv.h>
   5
   6 extern struct streamtab ppp_compinfo;
   7 extern int ppp_comp_count;
   8
   9 static struct vdldrv vd = {
  10     VDMAGIC_USER,
  11     "ppp_comp"
  12 };
  13
  14 static int fmodsw_index = -1;
  15
  16 int
  17 ppp_comp_vdcmd(fun, vdp, vdi, vds)
  18     unsigned int fun;
  19     struct vddrv *vdp;
  20     addr_t vdi;
  21     struct vdstat *vds;
  22 {
  23     int n;
  24
  25     switch (fun) {
  26     case VDLOAD:
  27         vdp->vdd_vdtab = (struct vdlinkage *) &vd;
  28         if (fmodsw_index >= 0)
  29             return EBUSY;
  30         for (n = 0; n < fmodcnt; ++n)
  31             if (fmodsw[n].f_str == 0)
  32                 break;
  33         if (n >= fmodcnt)
  34             return ENODEV;
  35         strncpy(fmodsw[n].f_name, vd.Drv_name, FMNAMESZ+1);
  36         fmodsw[n].f_str = &ppp_compinfo;
  37         fmodsw_index = n;
  38         break;
  39
  40     case VDUNLOAD:
  41         if (ppp_comp_count > 0)
  42             return EBUSY;
  43         if (fmodsw_index <= 0)
  44             return EINVAL;
  45         fmodsw[fmodsw_index].f_name[0] = 0;
  46         fmodsw[fmodsw_index].f_str = 0;
  47         fmodsw_index = -1;
  48         break;
  49
  50     case VDSTAT:
  51         break;
  52
  53     default:
  54         return EIO;
  55     }
  56     return 0;
  57 }