* mmap.cc (mmap): Outflank copy-on-write problem on 9x by

setting access mode to FILE_MAP_READ when read access is requested.

winsup/cygwin/mmap.cc

@@ -380,7 +380,10 @@ mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t off)
     }
 
   DWORD access = (prot & PROT_WRITE) ? FILE_MAP_WRITE : FILE_MAP_READ;
-  if (flags & MAP_PRIVATE)
+  /* copy-on-write doesn't work correctly on 9x. To have at least read
+     access we use *READ mapping on 9x when appropriate. It will still
+     fail when needing write access, though. */
+  if ((flags & MAP_PRIVATE) && (os_being_run == winNT || !(prot & PROT_READ)))
     access = FILE_MAP_COPY;
 
   SetResourceLock(LOCK_MMAP_LIST,READ_LOCK|WRITE_LOCK," mmap");