dnl Copyright (C) 2012-2024 Free Software Foundation, Inc.
dnl
dnl This file is part of GDB.
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 3 of the License, or
dnl (at your option) any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.

dnl Check the return and argument types of ptrace.

AC_DEFUN([GDB_AC_PTRACE],
[

AC_CHECK_HEADERS([sys/ptrace.h ptrace.h])

gdb_ptrace_headers='
#include <sys/types.h>
#if HAVE_SYS_PTRACE_H
# include <sys/ptrace.h>
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
'

# Check return type.  Varargs (used on GNU/Linux) conflict with the
# empty argument list, so check for that explicitly.
AC_CACHE_CHECK(
 [return type of ptrace],
 [gdb_cv_func_ptrace_ret],
 [AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
       [$gdb_ptrace_headers],
       [extern long ptrace (enum __ptrace_request, ...);]
     )],
    [gdb_cv_func_ptrace_ret='long'],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM(
          [$gdb_ptrace_headers],
          [extern int ptrace ();]
        )],
       [gdb_cv_func_ptrace_ret='int'],
       [gdb_cv_func_ptrace_ret='long']
     )]
  )]
)

AC_DEFINE_UNQUOTED(
 [PTRACE_TYPE_RET],
 [$gdb_cv_func_ptrace_ret],
 [Define as the return type of ptrace.]
)

# Check argument types.
AC_CACHE_CHECK(
 [types of arguments for ptrace],
 [gdb_cv_func_ptrace_args],
 [AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
       [$gdb_ptrace_headers],
       [extern long ptrace (enum __ptrace_request, ...);]
     )],
    [gdb_cv_func_ptrace_args='enum __ptrace_request,int,long,long'],
    [for gdb_arg1 in 'int' 'long'; do
       for gdb_arg2 in 'pid_t' 'int' 'long'; do
         for gdb_arg3 in 'int *' 'caddr_t' 'int' 'long' 'void *'; do
           for gdb_arg4 in 'int' 'long' 'void *'; do
             AC_COMPILE_IFELSE(
               [AC_LANG_PROGRAM(
                  [$gdb_ptrace_headers],
                  [extern $gdb_cv_func_ptrace_ret ptrace ($gdb_arg1, $gdb_arg2, $gdb_arg3, $gdb_arg4);]
                )],
               [gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4";
                break 4;]
             )

             for gdb_arg5 in 'int *' 'int' 'long'; do
               AC_COMPILE_IFELSE(
                 [AC_LANG_PROGRAM(
                    [$gdb_ptrace_headers],
                    [extern $gdb_cv_func_ptrace_ret ptrace ($gdb_arg1, $gdb_arg2, $gdb_arg3, $gdb_arg4, $gdb_arg5);]
                  )],
                 [gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4,$gdb_arg5";
                  break 5;]
               )
             done
           done
         done
       done
     done
     # Provide a safe default value.
     : ${gdb_cv_func_ptrace_args='int,int,long,long'}]
  )]
)

ac_save_IFS=$IFS; IFS=','
set dummy `echo "$gdb_cv_func_ptrace_args" | sed 's/\*/\*/g'`
IFS=$ac_save_IFS
shift
AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG1, $[1],
 [Define to the type of arg 1 for ptrace.])
AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG3, $[3],
 [Define to the type of arg 3 for ptrace.])
AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG4, $[4],
 [Define to the type of arg 4 for ptrace.])
if test -n "$[5]"; then
 AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG5, $[5],
   [Define to the type of arg 5 for ptrace.])
fi
])

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