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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
618234a5 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010-2015 Lennart Poettering | |
6 | Copyright 2015 Filipe Brandenburger | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
11c3a366 TA |
22 | #include <errno.h> |
23 | #include <stddef.h> | |
24 | #include <syslog.h> | |
25 | ||
b5efdb8a | 26 | #include "alloc-util.h" |
6bedfcbb | 27 | #include "cpu-set-util.h" |
84ac7bea | 28 | #include "extract-word.h" |
11c3a366 TA |
29 | #include "log.h" |
30 | #include "macro.h" | |
93cc7779 | 31 | #include "parse-util.h" |
b11d6a7b | 32 | #include "string-util.h" |
618234a5 LP |
33 | |
34 | cpu_set_t* cpu_set_malloc(unsigned *ncpus) { | |
35 | cpu_set_t *c; | |
36 | unsigned n = 1024; | |
37 | ||
38 | /* Allocates the cpuset in the right size */ | |
39 | ||
40 | for (;;) { | |
41 | c = CPU_ALLOC(n); | |
42 | if (!c) | |
43 | return NULL; | |
44 | ||
45 | if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), c) >= 0) { | |
46 | CPU_ZERO_S(CPU_ALLOC_SIZE(n), c); | |
47 | ||
48 | if (ncpus) | |
49 | *ncpus = n; | |
50 | ||
51 | return c; | |
52 | } | |
53 | ||
54 | CPU_FREE(c); | |
55 | ||
56 | if (errno != EINVAL) | |
57 | return NULL; | |
58 | ||
59 | n *= 2; | |
60 | } | |
61 | } | |
62 | ||
6d8a29b2 | 63 | int parse_cpu_set_internal( |
618234a5 LP |
64 | const char *rvalue, |
65 | cpu_set_t **cpu_set, | |
6d8a29b2 | 66 | bool warn, |
618234a5 LP |
67 | const char *unit, |
68 | const char *filename, | |
69 | unsigned line, | |
70 | const char *lvalue) { | |
71 | ||
618234a5 | 72 | _cleanup_cpu_free_ cpu_set_t *c = NULL; |
6d8a29b2 | 73 | const char *p = rvalue; |
618234a5 LP |
74 | unsigned ncpus = 0; |
75 | ||
618234a5 LP |
76 | assert(rvalue); |
77 | ||
78 | for (;;) { | |
79 | _cleanup_free_ char *word = NULL; | |
a26662ce | 80 | unsigned cpu, cpu_lower, cpu_upper; |
618234a5 LP |
81 | int r; |
82 | ||
6d8a29b2 YW |
83 | r = extract_first_word(&p, &word, WHITESPACE ",", EXTRACT_QUOTES); |
84 | if (r == -ENOMEM) | |
85 | return warn ? log_oom() : -ENOMEM; | |
a26662ce | 86 | if (r < 0) |
6d8a29b2 | 87 | return warn ? log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, rvalue) : r; |
618234a5 LP |
88 | if (r == 0) |
89 | break; | |
90 | ||
91 | if (!c) { | |
92 | c = cpu_set_malloc(&ncpus); | |
93 | if (!c) | |
6d8a29b2 | 94 | return warn ? log_oom() : -ENOMEM; |
618234a5 LP |
95 | } |
96 | ||
a26662ce FB |
97 | r = parse_range(word, &cpu_lower, &cpu_upper); |
98 | if (r < 0) | |
6d8a29b2 | 99 | return warn ? log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse CPU affinity '%s'", word) : r; |
a26662ce | 100 | if (cpu_lower >= ncpus || cpu_upper >= ncpus) |
6d8a29b2 | 101 | return warn ? log_syntax(unit, LOG_ERR, filename, line, EINVAL, "CPU out of range '%s' ncpus is %u", word, ncpus) : -EINVAL; |
032cf8e4 | 102 | |
6d8a29b2 YW |
103 | if (cpu_lower > cpu_upper) { |
104 | if (warn) | |
105 | log_syntax(unit, LOG_WARNING, filename, line, 0, "Range '%s' is invalid, %u > %u, ignoring", word, cpu_lower, cpu_upper); | |
106 | continue; | |
032cf8e4 YW |
107 | } |
108 | ||
6d8a29b2 YW |
109 | for (cpu = cpu_lower; cpu <= cpu_upper; cpu++) |
110 | CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c); | |
032cf8e4 YW |
111 | } |
112 | ||
113 | /* On success, sets *cpu_set and returns ncpus for the system. */ | |
1cc6c93a YW |
114 | if (c) |
115 | *cpu_set = TAKE_PTR(c); | |
032cf8e4 YW |
116 | |
117 | return (int) ncpus; | |
118 | } |