1 | /* Test sysconf with an empty chroot. |
2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library 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 GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdio.h> |
20 | #include <stdlib.h> |
21 | #include <support/check.h> |
22 | #include <support/namespace.h> |
23 | #include <support/support.h> |
24 | #include <support/temp_file.h> |
25 | #include <support/test-driver.h> |
26 | #include <support/xunistd.h> |
27 | #include <unistd.h> |
28 | |
29 | /* Check for an SMP system in a forked process, so that the parent |
30 | process does not cache the value. */ |
31 | static void |
32 | is_smp_callback (void *closure) |
33 | { |
34 | bool *result = closure; |
35 | |
36 | long cpus = sysconf (_SC_NPROCESSORS_ONLN); |
37 | TEST_VERIFY_EXIT (cpus > 0); |
38 | *result = cpus != 1; |
39 | } |
40 | |
41 | static bool |
42 | is_smp (void) |
43 | { |
44 | bool *result = support_shared_allocate (size: sizeof (*result)); |
45 | support_isolate_in_subprocess (callback: is_smp_callback, closure: result); |
46 | bool result_copy = *result; |
47 | support_shared_free (result); |
48 | return result_copy; |
49 | } |
50 | |
51 | static char *path_chroot; |
52 | |
53 | /* Prepare an empty directory, to be used as a chroot. */ |
54 | static void |
55 | prepare (int argc, char **argv) |
56 | { |
57 | path_chroot = xasprintf (format: "%s/tst-resolv-res_init-XXXXXX" , test_dir); |
58 | if (mkdtemp (template: path_chroot) == NULL) |
59 | FAIL_EXIT1 ("mkdtemp (\"%s\"): %m" , path_chroot); |
60 | add_temp_file (name: path_chroot); |
61 | } |
62 | |
63 | /* The actual test. Run it in a subprocess, so that the test harness |
64 | can remove the temporary directory in --direct mode. */ |
65 | static void |
66 | chroot_callback (void *closure) |
67 | { |
68 | xchroot (path: path_chroot); |
69 | long cpus = sysconf (_SC_NPROCESSORS_ONLN); |
70 | printf (format: "info: sysconf (_SC_NPROCESSORS_ONLN) in chroot: %ld\n" , cpus); |
71 | TEST_VERIFY (cpus > 0); |
72 | TEST_VERIFY (cpus != 1); |
73 | _exit (0); |
74 | } |
75 | |
76 | static int |
77 | do_test (void) |
78 | { |
79 | if (!is_smp ()) |
80 | { |
81 | printf (format: "warning: test not supported on uniprocessor system\n" ); |
82 | return EXIT_UNSUPPORTED; |
83 | } |
84 | |
85 | support_become_root (); |
86 | if (!support_can_chroot ()) |
87 | return EXIT_UNSUPPORTED; |
88 | |
89 | support_isolate_in_subprocess (callback: chroot_callback, NULL); |
90 | |
91 | return 0; |
92 | } |
93 | |
94 | #define PREPARE prepare |
95 | #include <support/test-driver.c> |
96 | |