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e2882c85 | 1 | /* Copyright 2015-2018 Free Software Foundation, Inc. |
df8411da SDJ |
2 | |
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <stdlib.h> | |
20 | #include <assert.h> | |
21 | #include <unistd.h> | |
22 | #include <stdio.h> | |
23 | #include <sys/mman.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | ||
27 | static void * | |
28 | do_mmap (void *addr, size_t size, int prot, int flags, int fd, off_t offset) | |
29 | { | |
30 | void *ret = mmap (addr, size, prot, flags, fd, offset); | |
31 | ||
32 | assert (ret != NULL); | |
33 | return ret; | |
34 | } | |
35 | ||
36 | int | |
37 | main (int argc, char *argv[]) | |
38 | { | |
39 | const size_t size = 10; | |
40 | const int default_prot = PROT_READ | PROT_WRITE; | |
41 | char *private_anon, *shared_anon; | |
42 | char *dont_dump; | |
43 | int i; | |
44 | ||
45 | private_anon = do_mmap (NULL, size, default_prot, | |
46 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
47 | memset (private_anon, 0x11, size); | |
48 | ||
49 | shared_anon = do_mmap (NULL, size, default_prot, | |
50 | MAP_SHARED | MAP_ANONYMOUS, -1, 0); | |
51 | memset (shared_anon, 0x22, size); | |
52 | ||
53 | dont_dump = do_mmap (NULL, size, default_prot, | |
54 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
55 | memset (dont_dump, 0x55, size); | |
56 | i = madvise (dont_dump, size, MADV_DONTDUMP); | |
57 | assert_perror (errno); | |
58 | assert (i == 0); | |
59 | ||
60 | return 0; /* break-here */ | |
61 | } | |
422349a3 YQ |
62 | |
63 | /* Write V to /proc/self/coredump_filter. Return 0 on success. */ | |
64 | ||
65 | int | |
66 | set_coredump_filter (int v) | |
67 | { | |
68 | FILE *f = fopen("/proc/self/coredump_filter", "r+"); | |
69 | ||
70 | if (f == NULL) | |
71 | return 1; | |
72 | ||
73 | fprintf(f, "%#x", v); | |
74 | ||
75 | fclose (f); | |
76 | return 0; | |
77 | } |