sysdeps/nptl/setxid.h

   1 /* Copyright (C) 2004-2016 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <nptl/pthreadP.h>
  19 #include <sysdep.h>
  20
  21 #define __SETXID_1(cmd, arg1) \
  22   cmd.id[0] = (long int) arg1
  23 #define __SETXID_2(cmd, arg1, arg2) \
  24   __SETXID_1 (cmd, arg1); cmd.id[1] = (long int) arg2
  25 #define __SETXID_3(cmd, arg1, arg2, arg3) \
  26   __SETXID_2 (cmd, arg1, arg2); cmd.id[2] = (long int) arg3
  27
  28 #ifdef SINGLE_THREAD
  29 # define INLINE_SETXID_SYSCALL(name, nr, args...) \
  30   INLINE_SYSCALL (name, nr, args)
  31 #elif defined SHARED
  32 # define INLINE_SETXID_SYSCALL(name, nr, args...) \
  33   ({                                                                    \
  34     int __result;                                                       \
  35     if (__builtin_expect (__libc_pthread_functions_init, 0))            \
  36       {                                                                 \
  37         struct xid_command __cmd;                                       \
  38         __cmd.syscall_no = __NR_##name;                                 \
  39         __SETXID_##nr (__cmd, args);                                    \
  40         __result = PTHFCT_CALL (ptr__nptl_setxid, (&__cmd));            \
  41         }                                                               \
  42     else                                                                \
  43       __result = INLINE_SYSCALL (name, nr, args);                       \
  44     __result;                                                           \
  45    })
  46 #else
  47 # define INLINE_SETXID_SYSCALL(name, nr, args...) \
  48   ({                                                                    \
  49     extern __typeof (__nptl_setxid) __nptl_setxid __attribute__((weak));\
  50     int __result;                                                       \
  51     if (__glibc_unlikely (__nptl_setxid != NULL))                             \
  52       {                                                                 \
  53         struct xid_command __cmd;                                       \
  54         __cmd.syscall_no = __NR_##name;                                 \
  55         __SETXID_##nr (__cmd, args);                                    \
  56         __result =__nptl_setxid (&__cmd);                               \
  57       }                                                                 \
  58     else                                                                \
  59       __result = INLINE_SYSCALL (name, nr, args);                       \
  60     __result;                                                           \
  61    })
  62 #endif