1 /* Copyright (C) 2018-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <errno.h>
19 #include <stdio.h>
20 #include <sys/resource.h>
21 #include <support/check.h>
22
23 static int resources[] = {
24 /* The following 7 limits are part of POSIX and must exist. */
25 RLIMIT_CORE,
26 RLIMIT_CPU,
27 RLIMIT_DATA,
28 RLIMIT_FSIZE,
29 RLIMIT_NOFILE,
30 RLIMIT_STACK,
31 RLIMIT_AS
32 };
33
34 #define nresources (sizeof (resources) / sizeof (resources[0]))
35
36 /* Assume that the prlimit64 function calls the prlimit64 syscall without
37 mangling the arguments. */
38 #define PRLIMIT64_INFINITY ((rlim64_t) -1)
39
40 /* As we don't know which limit will be modified, use a sufficiently high
41 value to not shoot ourself in the foot. Use a 32-bit value to test
42 both the 32- and 64-bit versions, and keep the highest bit clear to
43 avoid sign extension. */
44 #define PRLIMIT64_TESTVAL ((rlim64_t) 0x42420000)
45
46 static void
47 test_getrlimit (int resource, rlim_t exp_cur, rlim_t exp_max)
48 {
49 struct rlimit r;
50 TEST_VERIFY_EXIT (getrlimit (resource, &r) == 0);
51 TEST_COMPARE (r.rlim_cur, exp_cur);
52 TEST_COMPARE (r.rlim_max, exp_max);
53 }
54
55 static void
56 test_getrlimit64 (int resource, rlim64_t exp_cur, rlim64_t exp_max)
57 {
58 struct rlimit64 r;
59 TEST_VERIFY_EXIT (getrlimit64 (resource, &r) == 0);
60 TEST_COMPARE (r.rlim_cur, exp_cur);
61 TEST_COMPARE (r.rlim_max, exp_max);
62 }
63
64 static void
65 test_prlimit_get (int resource, rlim_t exp_cur, rlim_t exp_max)
66 {
67 struct rlimit r;
68 TEST_VERIFY_EXIT (prlimit (0, resource, NULL, &r) == 0);
69 TEST_COMPARE (r.rlim_cur, exp_cur);
70 TEST_COMPARE (r.rlim_max, exp_max);
71 }
72
73 static void
74 test_prlimit64_get (int resource, rlim64_t exp_cur, rlim64_t exp_max)
75 {
76 struct rlimit64 r;
77 TEST_COMPARE (prlimit64 (0, resource, NULL, &r), 0);
78 TEST_COMPARE (r.rlim_cur, exp_cur);
79 TEST_COMPARE (r.rlim_max, exp_max);
80 }
81
82 static void
83 test_setrlimit (int resource, rlim_t new_cur, rlim_t new_max)
84 {
85 struct rlimit r = { new_cur, new_max };
86 TEST_COMPARE (setrlimit (resource, &r), 0);
87 }
88
89 static void
90 test_setrlimit64 (int resource, rlim64_t new_cur, rlim64_t new_max)
91 {
92 struct rlimit64 r = { new_cur, new_max };
93 TEST_COMPARE (setrlimit64 (resource, &r), 0);
94 }
95
96 static void
97 test_prlimit_set (int resource, rlim_t new_cur, rlim_t new_max)
98 {
99 struct rlimit r = { new_cur, new_max };
100 TEST_COMPARE (prlimit (0, resource, &r, NULL), 0);
101 }
102
103 static void
104 test_prlimit64_set (int resource, rlim64_t new_cur, rlim64_t new_max)
105 {
106 struct rlimit64 r = { new_cur, new_max };
107 TEST_COMPARE (prlimit64 (0, resource, &r, NULL), 0);
108 }
109
110 static int
111 do_test (void)
112 {
113 int resource = -1;
114
115 /* Find a resource with hard limit set to infinity, so that the soft limit
116 can be manipulated to any value. */
117 for (int i = 0; i < nresources; ++i)
118 {
119 struct rlimit64 r64;
120 int res = prlimit64 (0, resources[i], NULL, &r64);
121 if ((res == 0) && (r64.rlim_max == PRLIMIT64_INFINITY))
122 {
123 resource = resources[i];
124 break;
125 }
126 }
127
128 if (resource == -1)
129 FAIL_UNSUPPORTED
130 ("Could not find and limit with hard limit set to infinity.");
131
132 /* First check that the get functions work correctly with the test value. */
133 test_prlimit64_set (resource, PRLIMIT64_TESTVAL, PRLIMIT64_INFINITY);
134 test_getrlimit (resource, PRLIMIT64_TESTVAL, RLIM_INFINITY);
135 test_getrlimit64 (resource, PRLIMIT64_TESTVAL, RLIM64_INFINITY);
136 test_prlimit_get (resource, PRLIMIT64_TESTVAL, RLIM_INFINITY);
137 test_prlimit64_get (resource, PRLIMIT64_TESTVAL, RLIM64_INFINITY);
138
139 /* Then check that the get functions work correctly with infinity. */
140 test_prlimit64_set (resource, PRLIMIT64_INFINITY, PRLIMIT64_INFINITY);
141 test_getrlimit (resource, RLIM_INFINITY, RLIM_INFINITY);
142 test_getrlimit64 (resource, RLIM64_INFINITY, RLIM64_INFINITY);
143 test_prlimit_get (resource, RLIM_INFINITY, RLIM_INFINITY);
144 test_prlimit64_get (resource, RLIM64_INFINITY, RLIM64_INFINITY);
145
146 /* Then check that setrlimit works correctly with the test value. */
147 test_setrlimit (resource, PRLIMIT64_TESTVAL, RLIM_INFINITY);
148 test_prlimit64_get (resource, PRLIMIT64_TESTVAL, PRLIMIT64_INFINITY);
149
150 /* Then check that setrlimit works correctly with infinity. */
151 test_setrlimit (resource, RLIM_INFINITY, RLIM_INFINITY);
152 test_prlimit64_get (resource, PRLIMIT64_INFINITY, PRLIMIT64_INFINITY);
153
154 /* Then check that setrlimit64 works correctly with the test value. */
155 test_setrlimit64 (resource, PRLIMIT64_TESTVAL, RLIM64_INFINITY);
156 test_prlimit64_get (resource, PRLIMIT64_TESTVAL, PRLIMIT64_INFINITY);
157
158 /* Then check that setrlimit64 works correctly with infinity. */
159 test_setrlimit64 (resource, RLIM64_INFINITY, RLIM64_INFINITY);
160 test_prlimit64_get (resource, PRLIMIT64_INFINITY, PRLIMIT64_INFINITY);
161
162 /* Then check that prlimit works correctly with the test value. */
163 test_prlimit_set (resource, RLIM_INFINITY, RLIM_INFINITY);
164 test_prlimit64_get (resource, PRLIMIT64_INFINITY, PRLIMIT64_INFINITY);
165
166 /* Finally check that prlimit works correctly with infinity. */
167 test_prlimit_set (resource, PRLIMIT64_TESTVAL, RLIM_INFINITY);
168 test_prlimit64_get (resource, PRLIMIT64_TESTVAL, PRLIMIT64_INFINITY);
169
170 return 0;
171 }
172
173 #include <support/test-driver.c>