external/gpl3/gcc/files/gcov-minix-fs-wrapper.h

   1 /* This header makes it possible to redefine system calls to the
   2  * file system. This way, minix servers can re-route the data
   3  * that libgcov tries to send to the file system. This is
   4  * necessary, because the servers can't access the file system
   5  * directly. Instead, they will copy the data to a helping user
   6  * space process, which will call the file system for them.
   7  * For more information, see the <minix/gcov.h> header file.
   8  */
   9
  10 #include <stdio.h>
  11 #include <unistd.h>
  12 #include <sys/types.h>
  13
  14
  15 /* These function pointers initially point to the standard system library
  16  * functions (fopen, etc). All calls to these system library functions are
  17  * then redefined to calls to these function pointers. Because the pointers
  18  * still point to the original functions, all functionality is unchanged.
  19  * Therefore, libgcov won't act differently when linked to applications.
  20  * But, when these pointers are redefined by code within the minix servers,
  21  * the file system calls get replaced by other functionality.
  22  */
  23
  24 #define fopen(...)  _gcov_fopen(__VA_ARGS__)
  25 #define fread(...)  _gcov_fread(__VA_ARGS__)
  26 #define fwrite(...) _gcov_fwrite(__VA_ARGS__)
  27 #define fclose(...) _gcov_fclose(__VA_ARGS__)
  28 #define fseek(...)  _gcov_fseek(__VA_ARGS__)
  29 #define getenv(...) _gcov_getenv(__VA_ARGS__)
  30
  31
  32 /* wrapper to make it possible to disable gcov_exit on a process exit (for mfs) */
  33
  34 int do_gcov_exit = 1;
  35
  36 void gcov_exit_wrapper(void){
  37         if(do_gcov_exit)
  38                 gcov_exit();
  39 }