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dnl -*- Autoconf -*-
dnl Copyright (C) 1993-2003 Free Software Foundation, Inc.
dnl This file is free software, distributed under the terms of the GNU
dnl General Public License. As a special exception to the GNU General
dnl Public License, this file may be distributed as part of a program
dnl that contains a configuration script generated by Autoconf, under
dnl the same distribution terms as the rest of that program.
dnl From Bruno Haible, Marcus Daniels, Sam Steingold.
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dnl -*- Autoconf -*-
dnl Copyright (C) 1993-2009 Free Software Foundation, Inc.
dnl This file is free software, distributed under the terms of the GNU
dnl General Public License. As a special exception to the GNU General
dnl Public License, this file may be distributed as part of a program
dnl that contains a configuration script generated by Autoconf, under
dnl the same distribution terms as the rest of that program.
dnl From Bruno Haible, Marcus Daniels, Sam Steingold.
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/* declare getpagesize() and mprotect() */
#include <sys/mman.h>
#ifndef HAVE_GETPAGESIZE
#include <sys/param.h>
#define getpagesize() PAGESIZE
#else
]AC_LANG_EXTERN[
#if defined(__STDC__) || defined(__cplusplus)
#else
RETGETPAGESIZETYPE getpagesize();
#endif
AC_TRY_RUN([$mprotect_prog
if (mprotect(page_align(fault_address),pagesize,PROT_NONE) < 0) exit(0);
foo = *fault_address; /* this should cause a core dump */
exit(0); }],
no_mprotect=1, rm -f core,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
AC_TRY_RUN([$mprotect_prog
if (mprotect(page_align(fault_address),pagesize,PROT_NONE) < 0) exit(0);
*fault_address = 'z'; /* this should cause a core dump */
exit(0); }],
no_mprotect=1, rm -f core,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
AC_TRY_RUN([$mprotect_prog
if (mprotect(page_align(fault_address),pagesize,PROT_READ) < 0) exit(0);
*fault_address = 'z'; /* this should cause a core dump */
exit(0); }],
no_mprotect=1, rm -f core,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
AC_TRY_RUN([$mprotect_prog
if (mprotect(page_align(fault_address),pagesize,PROT_READ) < 0) exit(1);
if (mprotect(page_align(fault_address),pagesize,PROT_READ|PROT_WRITE) < 0) exit(1);
*fault_address = 'z'; /* this should not cause a core dump */
exit(0); }], , no_mprotect=1
rm -f core,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
cl_cv_func_mprotect_works=yes
else
cl_cv_func_mprotect_works=no
fi
])
if test $cl_cv_func_mprotect_works = yes; then
AC_DEFINE(HAVE_WORKING_MPROTECT,,[have a working mprotect() function])
fi
fi
])
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/* declare getpagesize() and mprotect() */
#include <sys/mman.h>
#ifndef HAVE_GETPAGESIZE
#include <sys/param.h>
#define getpagesize() PAGESIZE
#else
]AC_LANG_EXTERN[
RETGETPAGESIZETYPE getpagesize (void);
#endif
char foo;
int main () {
unsigned long pagesize = getpagesize();
#define page_align(address) (char*)((unsigned long)(address) & -pagesize)
'
AC_TRY_RUN([$mprotect_prog
if ((pagesize-1) & pagesize) exit(1);
exit(0); }], , no_mprotect=1,
# When cross-compiling, don't assume anything.
no_mprotect=1)
mprotect_prog="$mprotect_prog"'
char* area = (char*) malloc(6*pagesize);
char* fault_address = area + pagesize*7/2;
'
if test -z "$no_mprotect"; then
AC_TRY_RUN(GL_NOCRASH[$mprotect_prog
nocrash_init();
if (mprotect(page_align(fault_address),pagesize,PROT_NONE) < 0) exit(0);
foo = *fault_address; /* this should cause an exception or signal */
exit(0); }], no_mprotect=1, ,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
AC_TRY_RUN(GL_NOCRASH[$mprotect_prog
nocrash_init();
if (mprotect(page_align(fault_address),pagesize,PROT_NONE) < 0) exit(0);
*fault_address = 'z'; /* this should cause an exception or signal */
exit(0); }], no_mprotect=1, ,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
AC_TRY_RUN(GL_NOCRASH[$mprotect_prog
nocrash_init();
if (mprotect(page_align(fault_address),pagesize,PROT_READ) < 0) exit(0);
*fault_address = 'z'; /* this should cause an exception or signal */
exit(0); }], no_mprotect=1, ,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
AC_TRY_RUN(GL_NOCRASH[$mprotect_prog
nocrash_init();
if (mprotect(page_align(fault_address),pagesize,PROT_READ) < 0) exit(1);
if (mprotect(page_align(fault_address),pagesize,PROT_READ|PROT_WRITE) < 0) exit(1);
*fault_address = 'z'; /* this should not cause an exception or signal */
exit(0); }], , no_mprotect=1,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
cl_cv_func_mprotect_works=yes
else
cl_cv_func_mprotect_works=no
fi
])
if test $cl_cv_func_mprotect_works = yes; then
AC_DEFINE([HAVE_WORKING_MPROTECT],[],[have a working mprotect() function])
fi
fi
])
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