db.1.85/PORT/linux/OTHER_PATCHES

   1 *** PORT/db/recno/rec_open.c.orig       1993/10/13 02:01:31
   2 --- PORT/db/recno/rec_open.c    1993/10/13 02:20:47
   3 ***************
   4 *** 159,167 ****
   5 --- 159,182 ----
   6                                 SET(t, R_EOF);
   7                         else {
   8                                 t->bt_msize = sb.st_size;
   9 + /*
  10 +  * hack :
  11 +  *
  12 +  * The Linux kernel mmap() semantics are broken :
  13 +  *
  14 +  * Under Linux, read only private mappings cause write only and read/write
  15 +  * opens to fail with errno=ETXTBSY.  Shared read only mappings should work
  16 +  * fine though, but I'm not familiar enough with the code to ascertain that
  17 +  * a MAP_SHARED mapping would be safe so I use the non-mmap'd version
  18 +  * instead.
  19 +  *
  20 +  */
  21 +
  22 + #if !defined(linux)
  23                                 if ((t->bt_smap = mmap(NULL, t->bt_msize,
  24                                     PROT_READ, MAP_PRIVATE, rfd,
  25                                     (off_t)0)) == (caddr_t)-1)
  26 + #endif
  27                                         goto slow;
  28                                 t->bt_cmap = t->bt_smap;
  29                                 t->bt_emap = t->bt_smap + sb.st_size;