Annotate Patch Side-by-side Diff

Differences From Artifact [1d2034adf5]:

To Artifact [c869fe2d0f]:

1
2

3
4
5
6
7
8
9

1

2
3
4
5
6
7
8
9


-
+








dnl -*- Autoconf -*-
dnl Copyright (C) 1993-2003 Free Software Foundation, Inc.
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.
︙
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54


55
56
57


58
59
60
61
62
63


64
65
66


67
68
69
70
71
72


73
74
75


76
77
78
79
80
81


82
83
84
85


86
87
88
89
90
91
92
93
94
95
96
97

98
99
100

26
27
28
29
30
31
32

33



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

50
51
52


53
54

55
56
57
58

59
60
61


62
63

64
65
66
67

68
69
70


71
72

73
74
75
76

77
78
79
80


81
82

83
84
85
86
87
88
89
90
91
92

93
94
95
96








-

-
-
-
















-
+
+

-
-
+
+
-




-
+
+

-
-
+
+
-




-
+
+

-
-
+
+
-




-
+
+


-
-
+
+
-










-
+




/* 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)
RETGETPAGESIZETYPE getpagesize (void);
#else
RETGETPAGESIZETYPE getpagesize();
#endif
#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 "$no_mprotect"; then
AC_TRY_RUN([$mprotect_prog
AC_TRY_RUN(GL_NOCRASH[$mprotect_prog
  nocrash_init();
  if (mprotect(page_align(fault_address),pagesize,PROT_NONE) < 0) exit(0);
  foo = *fault_address; /* this should cause a core dump */
  exit(0); }],
  foo = *fault_address; /* this should cause an exception or signal */
  exit(0); }], no_mprotect=1, ,
  no_mprotect=1, rm -f core,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
AC_TRY_RUN([$mprotect_prog
AC_TRY_RUN(GL_NOCRASH[$mprotect_prog
  nocrash_init();
  if (mprotect(page_align(fault_address),pagesize,PROT_NONE) < 0) exit(0);
  *fault_address = 'z'; /* this should cause a core dump */
  exit(0); }],
  *fault_address = 'z'; /* this should cause an exception or signal */
  exit(0); }], no_mprotect=1, ,
  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
AC_TRY_RUN(GL_NOCRASH[$mprotect_prog
  nocrash_init();
  if (mprotect(page_align(fault_address),pagesize,PROT_READ) < 0) exit(0);
  *fault_address = 'z'; /* this should cause a core dump */
  exit(0); }],
  *fault_address = 'z'; /* this should cause an exception or signal */
  exit(0); }], no_mprotect=1, ,
  no_mprotect=1, rm -f core,
: # When cross-compiling, don't assume anything.
)
fi
if test -z "$no_mprotect"; then
AC_TRY_RUN([$mprotect_prog
AC_TRY_RUN(GL_NOCRASH[$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 a core dump */
  exit(0); }], , no_mprotect=1
  *fault_address = 'z'; /* this should not cause an exception or signal */
  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])
  AC_DEFINE([HAVE_WORKING_MPROTECT],[],[have a working mprotect() function])
fi
fi
])