summaryrefslogtreecommitdiff
path: root/src/basic/rlimit-util.c
blob: ca834df621311b52c85a5972ea2eb27bb51a54cb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <errno.h>
#include <sys/resource.h>

#include "alloc-util.h"
#include "extract-word.h"
#include "format-util.h"
#include "macro.h"
#include "missing.h"
#include "rlimit-util.h"
#include "string-table.h"
#include "time-util.h"

int setrlimit_closest(int resource, const struct rlimit *rlim) {
        struct rlimit highest, fixed;

        assert(rlim);

        if (setrlimit(resource, rlim) >= 0)
                return 0;

        if (errno != EPERM)
                return -errno;

        /* So we failed to set the desired setrlimit, then let's try
         * to get as close as we can */
        assert_se(getrlimit(resource, &highest) == 0);

        fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
        fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);

        if (setrlimit(resource, &fixed) < 0)
                return -errno;

        return 0;
}

static int rlimit_parse_u64(const char *val, rlim_t *ret) {
        uint64_t u;
        int r;

        assert(val);
        assert(ret);

        if (streq(val, "infinity")) {
                *ret = RLIM_INFINITY;
                return 0;
        }

        /* setrlimit(2) suggests rlim_t is always 64bit on Linux. */
        assert_cc(sizeof(rlim_t) == sizeof(uint64_t));

        r = safe_atou64(val, &u);
        if (r < 0)
                return r;
        if (u >= (uint64_t) RLIM_INFINITY)
                return -ERANGE;

        *ret = (rlim_t) u;
        return 0;
}

static int rlimit_parse_size(const char *val, rlim_t *ret) {
        uint64_t u;
        int r;

        assert(val);
        assert(ret);

        if (streq(val, "infinity")) {
                *ret = RLIM_INFINITY;
                return 0;
        }

        r = parse_size(val, 1024, &u);
        if (r < 0)
                return r;
        if (u >= (uint64_t) RLIM_INFINITY)
                return -ERANGE;

        *ret = (rlim_t) u;
        return 0;
}

static int rlimit_parse_sec(const char *val, rlim_t *ret) {
        uint64_t u;
        usec_t t;
        int r;

        assert(val);
        assert(ret);

        if (streq(val, "infinity")) {
                *ret = RLIM_INFINITY;
                return 0;
        }

        r = parse_sec(val, &t);
        if (r < 0)
                return r;
        if (t == USEC_INFINITY) {
                *ret = RLIM_INFINITY;
                return 0;
        }

        u = (uint64_t) DIV_ROUND_UP(t, USEC_PER_SEC);
        if (u >= (uint64_t) RLIM_INFINITY)
                return -ERANGE;

        *ret = (rlim_t) u;
        return 0;
}

static int rlimit_parse_usec(const char *val, rlim_t *ret) {
        usec_t t;
        int r;

        assert(val);
        assert(ret);

        if (streq(val, "infinity")) {
                *ret = RLIM_INFINITY;
                return 0;
        }

        r = parse_time(val, &t, 1);
        if (r < 0)
                return r;
        if (t == USEC_INFINITY) {
                *ret = RLIM_INFINITY;
                return 0;
        }

        *ret = (rlim_t) t;
        return 0;
}

static int rlimit_parse_nice(const char *val, rlim_t *ret) {
        uint64_t rl;
        int r;

        /* So, Linux is weird. The range for RLIMIT_NICE is 40..1, mapping to the nice levels -20..19. However, the
         * RLIMIT_NICE limit defaults to 0 by the kernel, i.e. a value that maps to nice level 20, which of course is
         * bogus and does not exist. In order to permit parsing the RLIMIT_NICE of 0 here we hence implement a slight
         * asymmetry: when parsing as positive nice level we permit 0..19. When parsing as negative nice level, we
         * permit -20..0. But when parsing as raw resource limit value then we also allow the special value 0.
         *
         * Yeah, Linux is quality engineering sometimes... */

        if (val[0] == '+') {

                /* Prefixed with "+": Parse as positive user-friendly nice value */
                r = safe_atou64(val + 1, &rl);
                if (r < 0)
                        return r;

                if (rl >= PRIO_MAX)
                        return -ERANGE;

                rl = 20 - rl;

        } else if (val[0] == '-') {

                /* Prefixed with "-": Parse as negative user-friendly nice value */
                r = safe_atou64(val + 1, &rl);
                if (r < 0)
                        return r;

                if (rl > (uint64_t) (-PRIO_MIN))
                        return -ERANGE;

                rl = 20 + rl;
        } else {

                /* Not prefixed: parse as raw resource limit value */
                r = safe_atou64(val, &rl);
                if (r < 0)
                        return r;

                if (rl > (uint64_t) (20 - PRIO_MIN))
                        return -ERANGE;
        }

        *ret = (rlim_t) rl;
        return 0;
}

static int (*const rlimit_parse_table[_RLIMIT_MAX])(const char *val, rlim_t *ret) = {
        [RLIMIT_CPU] = rlimit_parse_sec,
        [RLIMIT_FSIZE] = rlimit_parse_size,
        [RLIMIT_DATA] = rlimit_parse_size,
        [RLIMIT_STACK] = rlimit_parse_size,
        [RLIMIT_CORE] = rlimit_parse_size,
        [RLIMIT_RSS] = rlimit_parse_size,
        [RLIMIT_NOFILE] = rlimit_parse_u64,
        [RLIMIT_AS] = rlimit_parse_size,
        [RLIMIT_NPROC] = rlimit_parse_u64,
        [RLIMIT_MEMLOCK] = rlimit_parse_size,
        [RLIMIT_LOCKS] = rlimit_parse_u64,
        [RLIMIT_SIGPENDING] = rlimit_parse_u64,
        [RLIMIT_MSGQUEUE] = rlimit_parse_size,
        [RLIMIT_NICE] = rlimit_parse_nice,
        [RLIMIT_RTPRIO] = rlimit_parse_u64,
        [RLIMIT_RTTIME] = rlimit_parse_usec,
};

int rlimit_parse_one(int resource, const char *val, rlim_t *ret) {
        assert(val);
        assert(ret);

        if (resource < 0)
                return -EINVAL;
        if (resource >= _RLIMIT_MAX)
                return -EINVAL;

        return rlimit_parse_table[resource](val, ret);
}

int rlimit_parse(int resource, const char *val, struct rlimit *ret) {
        _cleanup_free_ char *hard = NULL, *soft = NULL;
        rlim_t hl, sl;
        int r;

        assert(val);
        assert(ret);

        r = extract_first_word(&val, &soft, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
        if (r < 0)
                return r;
        if (r == 0)
                return -EINVAL;

        r = rlimit_parse_one(resource, soft, &sl);
        if (r < 0)
                return r;

        r = extract_first_word(&val, &hard, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
        if (r < 0)
                return r;
        if (!isempty(val))
                return -EINVAL;
        if (r == 0)
                hl = sl;
        else {
                r = rlimit_parse_one(resource, hard, &hl);
                if (r < 0)
                        return r;
                if (sl > hl)
                        return -EILSEQ;
        }

        *ret = (struct rlimit) {
                .rlim_cur = sl,
                .rlim_max = hl,
        };

        return 0;
}

int rlimit_format(const struct rlimit *rl, char **ret) {
        char *s = NULL;

        assert(rl);
        assert(ret);

        if (rl->rlim_cur >= RLIM_INFINITY && rl->rlim_max >= RLIM_INFINITY)
                s = strdup("infinity");
        else if (rl->rlim_cur >= RLIM_INFINITY)
                (void) asprintf(&s, "infinity:" RLIM_FMT, rl->rlim_max);
        else if (rl->rlim_max >= RLIM_INFINITY)
                (void) asprintf(&s, RLIM_FMT ":infinity", rl->rlim_cur);
        else if (rl->rlim_cur == rl->rlim_max)
                (void) asprintf(&s, RLIM_FMT, rl->rlim_cur);
        else
                (void) asprintf(&s, RLIM_FMT ":" RLIM_FMT, rl->rlim_cur, rl->rlim_max);

        if (!s)
                return -ENOMEM;

        *ret = s;
        return 0;
}

static const char* const rlimit_table[_RLIMIT_MAX] = {
        [RLIMIT_CPU] = "LimitCPU",
        [RLIMIT_FSIZE] = "LimitFSIZE",
        [RLIMIT_DATA] = "LimitDATA",
        [RLIMIT_STACK] = "LimitSTACK",
        [RLIMIT_CORE] = "LimitCORE",
        [RLIMIT_RSS] = "LimitRSS",
        [RLIMIT_NOFILE] = "LimitNOFILE",
        [RLIMIT_AS] = "LimitAS",
        [RLIMIT_NPROC] = "LimitNPROC",
        [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
        [RLIMIT_LOCKS] = "LimitLOCKS",
        [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
        [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
        [RLIMIT_NICE] = "LimitNICE",
        [RLIMIT_RTPRIO] = "LimitRTPRIO",
        [RLIMIT_RTTIME] = "LimitRTTIME"
};

DEFINE_STRING_TABLE_LOOKUP(rlimit, int);