gdb/ptrace.m4

   1 dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
   2 dnl
   3 dnl This file is part of GDB.
   4 dnl
   5 dnl This program is free software; you can redistribute it and/or modify
   6 dnl it under the terms of the GNU General Public License as published by
   7 dnl the Free Software Foundation; either version 3 of the License, or
   8 dnl (at your option) any later version.
   9 dnl
  10 dnl This program is distributed in the hope that it will be useful,
  11 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 dnl GNU General Public License for more details.
  14 dnl
  15 dnl You should have received a copy of the GNU General Public License
  16 dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 dnl Check the return and argument types of ptrace.
  19
  20 AC_DEFUN([GDB_AC_PTRACE],
  21 [
  22
  23 AC_CHECK_HEADERS([sys/ptrace.h ptrace.h])
  24
  25 gdb_ptrace_headers='
  26 #include <sys/types.h>
  27 #if HAVE_SYS_PTRACE_H
  28 # include <sys/ptrace.h>
  29 #endif
  30 #if HAVE_UNISTD_H
  31 # include <unistd.h>
  32 #endif
  33 '
  34 # There is no point in checking if we don't have a prototype.
  35 AC_CHECK_DECLS(ptrace, [], [
  36   : ${gdb_cv_func_ptrace_ret='int'}
  37   : ${gdb_cv_func_ptrace_args='int,int,long,long'}
  38 ], $gdb_ptrace_headers)
  39 # Check return type.  Varargs (used on GNU/Linux) conflict with the
  40 # empty argument list, so check for that explicitly.
  41 AC_CACHE_CHECK([return type of ptrace], gdb_cv_func_ptrace_ret,
  42   AC_TRY_COMPILE($gdb_ptrace_headers,
  43     [extern long ptrace (enum __ptrace_request, ...);],
  44     gdb_cv_func_ptrace_ret='long',
  45     AC_TRY_COMPILE($gdb_ptrace_headers,
  46       [extern int ptrace ();],
  47       gdb_cv_func_ptrace_ret='int',
  48       gdb_cv_func_ptrace_ret='long')))
  49 AC_DEFINE_UNQUOTED(PTRACE_TYPE_RET, $gdb_cv_func_ptrace_ret,
  50   [Define as the return type of ptrace.])
  51 # Check argument types.
  52 AC_CACHE_CHECK([types of arguments for ptrace], gdb_cv_func_ptrace_args, [
  53   AC_TRY_COMPILE($gdb_ptrace_headers,
  54     [extern long ptrace (enum __ptrace_request, ...);],
  55     [gdb_cv_func_ptrace_args='enum __ptrace_request,int,long,long'],[
  56 for gdb_arg1 in 'int' 'long'; do
  57  for gdb_arg2 in 'pid_t' 'int' 'long'; do
  58   for gdb_arg3 in 'int *' 'caddr_t' 'int' 'long' 'void *'; do
  59    for gdb_arg4 in 'int' 'long' 'void *'; do
  60      AC_TRY_COMPILE($gdb_ptrace_headers, [
  61 extern $gdb_cv_func_ptrace_ret
  62   ptrace ($gdb_arg1, $gdb_arg2, $gdb_arg3, $gdb_arg4);
  63 ], [gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4";
  64     break 4;])
  65     for gdb_arg5 in 'int *' 'int' 'long'; do
  66      AC_TRY_COMPILE($gdb_ptrace_headers, [
  67 extern $gdb_cv_func_ptrace_ret
  68   ptrace ($gdb_arg1, $gdb_arg2, $gdb_arg3, $gdb_arg4, $gdb_arg5);
  69 ], [
  70 gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4,$gdb_arg5";
  71     break 5;])
  72     done
  73    done
  74   done
  75  done
  76 done
  77 # Provide a safe default value.
  78 : ${gdb_cv_func_ptrace_args='int,int,long,long'}
  79 ])])
  80 ac_save_IFS=$IFS; IFS=','
  81 set dummy `echo "$gdb_cv_func_ptrace_args" | sed 's/\*/\*/g'`
  82 IFS=$ac_save_IFS
  83 shift
  84 AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG1, $[1],
  85   [Define to the type of arg 1 for ptrace.])
  86 AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG3, $[3],
  87   [Define to the type of arg 3 for ptrace.])
  88 AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG4, $[4],
  89   [Define to the type of arg 4 for ptrace.])
  90 if test -n "$[5]"; then
  91   AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG5, $[5],
  92     [Define to the type of arg 5 for ptrace.])
  93 fi
  94 ])