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1ff6c67a FW |
1 | /* Test sysconf with an empty chroot. |
2 | Copyright (C) 2017 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 | <http://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 (sizeof (*result)); | |
45 | support_isolate_in_subprocess (is_smp_callback, 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 ("%s/tst-resolv-res_init-XXXXXX", test_dir); | |
58 | if (mkdtemp (path_chroot) == NULL) | |
59 | FAIL_EXIT1 ("mkdtemp (\"%s\"): %m", path_chroot); | |
60 | add_temp_file (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_chroot); | |
69 | long cpus = sysconf (_SC_NPROCESSORS_ONLN); | |
70 | printf ("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 ("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 (chroot_callback, NULL); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | #define PREPARE prepare | |
95 | #include <support/test-driver.c> |