nptl/sysdeps/pthread/setxid.h

   1 /* Copyright (C) 2004, 2007 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <pthreadP.h>
  20 #include <sysdep.h>
  21
  22 #define __SETXID_1(cmd, arg1) \
  23   cmd.id[0] = arg1
  24 #define __SETXID_2(cmd, arg1, arg2) \
  25   __SETXID_1 (cmd, arg1); cmd.id[1] = arg2
  26 #define __SETXID_3(cmd, arg1, arg2, arg3) \
  27   __SETXID_2 (cmd, arg1, arg2); cmd.id[2] = arg3
  28
  29 #ifdef SINGLE_THREAD
  30 # define INLINE_SETXID_SYSCALL(name, nr, args...) \
  31   INLINE_SYSCALL (name, nr, args)
  32 #elif defined SHARED
  33 # define INLINE_SETXID_SYSCALL(name, nr, args...) \
  34   ({                                                                    \
  35     int __result;                                                       \
  36     if (__builtin_expect (__libc_pthread_functions_init, 0))            \
  37       {                                                                 \
  38         struct xid_command __cmd;                                       \
  39         __cmd.syscall_no = __NR_##name;                                 \
  40         __SETXID_##nr (__cmd, args);                                    \
  41         __result = PTHFCT_CALL (ptr__nptl_setxid, (&__cmd));            \
  42         }                                                               \
  43     else                                                                \
  44       __result = INLINE_SYSCALL (name, nr, args);                       \
  45     __result;                                                           \
  46    })
  47 #else
  48 # define INLINE_SETXID_SYSCALL(name, nr, args...) \
  49   ({                                                                    \
  50     extern __typeof (__nptl_setxid) __nptl_setxid __attribute__((weak));\
  51     int __result;                                                       \
  52     if (__builtin_expect (__nptl_setxid != NULL, 0))                    \
  53       {                                                                 \
  54         struct xid_command __cmd;                                       \
  55         __cmd.syscall_no = __NR_##name;                                 \
  56         __SETXID_##nr (__cmd, args);                                    \
  57         __result =__nptl_setxid (&__cmd);                               \
  58       }                                                                 \
  59     else                                                                \
  60       __result = INLINE_SYSCALL (name, nr, args);                       \
  61     __result;                                                           \
  62    })
  63 #endif