| 1 | dnl Copyright (C) 2012-2015 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 | # Needs to be tested in C++ mode, to detect whether we need to cast |
| 26 | # the first argument to enum __ptrace_request. |
| 27 | if test "$enable_build_with_cxx" = "yes"; then |
| 28 | AC_LANG_PUSH([C++]) |
| 29 | fi |
| 30 | |
| 31 | gdb_ptrace_headers=' |
| 32 | #include <sys/types.h> |
| 33 | #if HAVE_SYS_PTRACE_H |
| 34 | # include <sys/ptrace.h> |
| 35 | #endif |
| 36 | #if HAVE_UNISTD_H |
| 37 | # include <unistd.h> |
| 38 | #endif |
| 39 | ' |
| 40 | # There is no point in checking if we don't have a prototype. |
| 41 | AC_CHECK_DECLS(ptrace, [], [ |
| 42 | : ${gdb_cv_func_ptrace_ret='int'} |
| 43 | : ${gdb_cv_func_ptrace_args='int,int,long,long'} |
| 44 | ], $gdb_ptrace_headers) |
| 45 | # Check return type. Varargs (used on GNU/Linux) conflict with the |
| 46 | # empty argument list, so check for that explicitly. |
| 47 | AC_CACHE_CHECK([return type of ptrace], gdb_cv_func_ptrace_ret, |
| 48 | AC_TRY_COMPILE($gdb_ptrace_headers, |
| 49 | [extern long ptrace (enum __ptrace_request, ...);], |
| 50 | gdb_cv_func_ptrace_ret='long', |
| 51 | AC_TRY_COMPILE($gdb_ptrace_headers, |
| 52 | [extern int ptrace ();], |
| 53 | gdb_cv_func_ptrace_ret='int', |
| 54 | gdb_cv_func_ptrace_ret='long'))) |
| 55 | AC_DEFINE_UNQUOTED(PTRACE_TYPE_RET, $gdb_cv_func_ptrace_ret, |
| 56 | [Define as the return type of ptrace.]) |
| 57 | # Check argument types. |
| 58 | AC_CACHE_CHECK([types of arguments for ptrace], gdb_cv_func_ptrace_args, [ |
| 59 | AC_TRY_COMPILE($gdb_ptrace_headers, |
| 60 | [extern long ptrace (enum __ptrace_request, ...);], |
| 61 | [gdb_cv_func_ptrace_args='enum __ptrace_request,int,long,long'],[ |
| 62 | for gdb_arg1 in 'int' 'long'; do |
| 63 | for gdb_arg2 in 'pid_t' 'int' 'long'; do |
| 64 | for gdb_arg3 in 'int *' 'caddr_t' 'int' 'long' 'void *'; do |
| 65 | for gdb_arg4 in 'int' 'long' 'void *'; do |
| 66 | AC_TRY_COMPILE($gdb_ptrace_headers, [ |
| 67 | extern $gdb_cv_func_ptrace_ret |
| 68 | ptrace ($gdb_arg1, $gdb_arg2, $gdb_arg3, $gdb_arg4); |
| 69 | ], [gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4"; |
| 70 | break 4;]) |
| 71 | for gdb_arg5 in 'int *' 'int' 'long'; do |
| 72 | AC_TRY_COMPILE($gdb_ptrace_headers, [ |
| 73 | extern $gdb_cv_func_ptrace_ret |
| 74 | ptrace ($gdb_arg1, $gdb_arg2, $gdb_arg3, $gdb_arg4, $gdb_arg5); |
| 75 | ], [ |
| 76 | gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4,$gdb_arg5"; |
| 77 | break 5;]) |
| 78 | done |
| 79 | done |
| 80 | done |
| 81 | done |
| 82 | done |
| 83 | # Provide a safe default value. |
| 84 | : ${gdb_cv_func_ptrace_args='int,int,long,long'} |
| 85 | ])]) |
| 86 | ac_save_IFS=$IFS; IFS=',' |
| 87 | set dummy `echo "$gdb_cv_func_ptrace_args" | sed 's/\*/\*/g'` |
| 88 | IFS=$ac_save_IFS |
| 89 | shift |
| 90 | AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG1, $[1], |
| 91 | [Define to the type of arg 1 for ptrace.]) |
| 92 | AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG3, $[3], |
| 93 | [Define to the type of arg 3 for ptrace.]) |
| 94 | AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG4, $[4], |
| 95 | [Define to the type of arg 4 for ptrace.]) |
| 96 | if test -n "$[5]"; then |
| 97 | AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG5, $[5], |
| 98 | [Define to the type of arg 5 for ptrace.]) |
| 99 | fi |
| 100 | |
| 101 | if test "$enable_build_with_cxx" = "yes"; then |
| 102 | AC_LANG_POP([C++]) |
| 103 | fi |
| 104 | ]) |