gdbsupport/ptrace.m4

   1 dnl Copyright (C) 2012-2021 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
  35 # Check return type.  Varargs (used on GNU/Linux) conflict with the
  36 # empty argument list, so check for that explicitly.
  37 AC_CACHE_CHECK(
  38   [return type of ptrace],
  39   [gdb_cv_func_ptrace_ret],
  40   [AC_COMPILE_IFELSE(
  41      [AC_LANG_PROGRAM(
  42         [$gdb_ptrace_headers],
  43         [extern long ptrace (enum __ptrace_request, ...);]
  44       )],
  45      [gdb_cv_func_ptrace_ret='long'],
  46      [AC_COMPILE_IFELSE(
  47         [AC_LANG_PROGRAM(
  48            [$gdb_ptrace_headers],
  49            [extern int ptrace ();]
  50          )],
  51         [gdb_cv_func_ptrace_ret='int'],
  52         [gdb_cv_func_ptrace_ret='long']
  53       )]
  54    )]
  55 )
  56
  57 AC_DEFINE_UNQUOTED(
  58   [PTRACE_TYPE_RET],
  59   [$gdb_cv_func_ptrace_ret],
  60   [Define as the return type of ptrace.]
  61 )
  62
  63 # Check argument types.
  64 AC_CACHE_CHECK(
  65   [types of arguments for ptrace],
  66   [gdb_cv_func_ptrace_args],
  67   [AC_COMPILE_IFELSE(
  68      [AC_LANG_PROGRAM(
  69         [$gdb_ptrace_headers],
  70         [extern long ptrace (enum __ptrace_request, ...);]
  71       )],
  72      [gdb_cv_func_ptrace_args='enum __ptrace_request,int,long,long'],
  73      [for gdb_arg1 in 'int' 'long'; do
  74         for gdb_arg2 in 'pid_t' 'int' 'long'; do
  75           for gdb_arg3 in 'int *' 'caddr_t' 'int' 'long' 'void *'; do
  76             for gdb_arg4 in 'int' 'long' 'void *'; do
  77               AC_COMPILE_IFELSE(
  78                 [AC_LANG_PROGRAM(
  79                    [$gdb_ptrace_headers],
  80                    [extern $gdb_cv_func_ptrace_ret ptrace ($gdb_arg1, $gdb_arg2, $gdb_arg3, $gdb_arg4);]
  81                  )],
  82                 [gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4";
  83                  break 4;]
  84               )
  85
  86               for gdb_arg5 in 'int *' 'int' 'long'; do
  87                 AC_COMPILE_IFELSE(
  88                   [AC_LANG_PROGRAM(
  89                      [$gdb_ptrace_headers],
  90                      [extern $gdb_cv_func_ptrace_ret ptrace ($gdb_arg1, $gdb_arg2, $gdb_arg3, $gdb_arg4, $gdb_arg5);]
  91                    )],
  92                   [gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4,$gdb_arg5";
  93                    break 5;]
  94                 )
  95               done
  96             done
  97           done
  98         done
  99       done
 100       # Provide a safe default value.
 101       : ${gdb_cv_func_ptrace_args='int,int,long,long'}]
 102    )]
 103 )
 104
 105 ac_save_IFS=$IFS; IFS=','
 106 set dummy `echo "$gdb_cv_func_ptrace_args" | sed 's/\*/\*/g'`
 107 IFS=$ac_save_IFS
 108 shift
 109 AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG1, $[1],
 110   [Define to the type of arg 1 for ptrace.])
 111 AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG3, $[3],
 112   [Define to the type of arg 3 for ptrace.])
 113 AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG4, $[4],
 114   [Define to the type of arg 4 for ptrace.])
 115 if test -n "$[5]"; then
 116   AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG5, $[5],
 117     [Define to the type of arg 5 for ptrace.])
 118 fi
 119 ])