arch/um/kernel/tt/unmap.c

   1 /*
   2  * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <sys/mman.h>
   7
   8 int switcheroo(int fd, int prot, void *from, void *to, int size)
   9 {
  10         if(munmap(to, size) < 0){
  11                 return(-1);
  12         }
  13         if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) != to){
  14                 return(-1);
  15         }
  16         if(munmap(from, size) < 0){
  17                 return(-1);
  18         }
  19         return(0);
  20 }
  21
  22 /*
  23  * Overrides for Emacs so that we follow Linus's tabbing style.
  24  * Emacs will notice this stuff at the end of the file and automatically
  25  * adjust the settings for this buffer only.  This must remain at the end
  26  * of the file.
  27  * ---------------------------------------------------------------------------
  28  * Local variables:
  29  * c-file-style: "linux"
  30  * End:
  31  */