sysdeps/generic/bp-semctl.h

   1 /* Bounded-pointer checking macros for C.
   2    Copyright (C) 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Greg McGary <greg@mcgary.org>
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _bp_semctl_h_
  22 #define _bp_semctl_h_ 1
  23
  24 #if __BOUNDED_POINTERS__
  25
  26 # define CHECK_SEMCTL(ARGP, SEMID, CMD) check_semctl (ARGP, SEMID, CMD)
  27
  28 union semun *__unbounded
  29 check_semctl (union semun *arg, int semid, int cmd)
  30 {
  31   int ipc64 = (cmd & __IPC_64);
  32
  33   switch (cmd & ~__IPC_64)
  34     {
  35     case IPC_STAT:
  36     case IPC_SET:
  37       (void) CHECK_1 (arg->buf);
  38       break;
  39
  40     case GETALL:
  41     case SETALL:
  42       {
  43         struct semid_ds ds;
  44         union semun un = { .buf = &ds };
  45         unsigned int length = ~0;
  46
  47         /* It's unfortunate that we need to make a recursive
  48            system call to get the size of the semaphore set...  */
  49         if (semctl (semid, 0, IPC_STAT | ipc64, un) == 0)
  50           length = ds.sem_nsems;
  51         (void) CHECK_N (arg->array, length);
  52         break;
  53       }
  54
  55     case IPC_INFO:
  56       (void) CHECK_1 (arg->__buf);
  57       break;
  58     }
  59
  60   return __ptrvalue (arg);
  61 }
  62
  63 #else
  64 # define CHECK_SEMCTL(ARGP, SEMID, CMD) (ARGP)
  65 #endif
  66
  67 #endif /* _bp_semctl_h_ */