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6300502b MP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010-2015 Lennart Poettering | |
7 | Copyright 2015 Filipe Brandenburger | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
db2df898 | 23 | #include "alloc-util.h" |
6300502b | 24 | #include "cpu-set-util.h" |
db2df898 MP |
25 | #include "extract-word.h" |
26 | #include "parse-util.h" | |
27 | #include "string-util.h" | |
28 | #include "util.h" | |
6300502b MP |
29 | |
30 | cpu_set_t* cpu_set_malloc(unsigned *ncpus) { | |
31 | cpu_set_t *c; | |
32 | unsigned n = 1024; | |
33 | ||
34 | /* Allocates the cpuset in the right size */ | |
35 | ||
36 | for (;;) { | |
37 | c = CPU_ALLOC(n); | |
38 | if (!c) | |
39 | return NULL; | |
40 | ||
41 | if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), c) >= 0) { | |
42 | CPU_ZERO_S(CPU_ALLOC_SIZE(n), c); | |
43 | ||
44 | if (ncpus) | |
45 | *ncpus = n; | |
46 | ||
47 | return c; | |
48 | } | |
49 | ||
50 | CPU_FREE(c); | |
51 | ||
52 | if (errno != EINVAL) | |
53 | return NULL; | |
54 | ||
55 | n *= 2; | |
56 | } | |
57 | } | |
58 | ||
59 | int parse_cpu_set_and_warn( | |
60 | const char *rvalue, | |
61 | cpu_set_t **cpu_set, | |
62 | const char *unit, | |
63 | const char *filename, | |
64 | unsigned line, | |
65 | const char *lvalue) { | |
66 | ||
67 | const char *whole_rvalue = rvalue; | |
68 | _cleanup_cpu_free_ cpu_set_t *c = NULL; | |
69 | unsigned ncpus = 0; | |
70 | ||
71 | assert(lvalue); | |
72 | assert(rvalue); | |
73 | ||
74 | for (;;) { | |
75 | _cleanup_free_ char *word = NULL; | |
db2df898 | 76 | unsigned cpu, cpu_lower, cpu_upper; |
6300502b MP |
77 | int r; |
78 | ||
db2df898 MP |
79 | r = extract_first_word(&rvalue, &word, WHITESPACE ",", EXTRACT_QUOTES); |
80 | if (r < 0) | |
81 | return log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue); | |
6300502b MP |
82 | if (r == 0) |
83 | break; | |
84 | ||
85 | if (!c) { | |
86 | c = cpu_set_malloc(&ncpus); | |
87 | if (!c) | |
88 | return log_oom(); | |
89 | } | |
90 | ||
db2df898 MP |
91 | r = parse_range(word, &cpu_lower, &cpu_upper); |
92 | if (r < 0) | |
93 | return log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse CPU affinity '%s'", word); | |
94 | if (cpu_lower >= ncpus || cpu_upper >= ncpus) | |
95 | return log_syntax(unit, LOG_ERR, filename, line, EINVAL, "CPU out of range '%s' ncpus is %u", word, ncpus); | |
96 | ||
97 | if (cpu_lower > cpu_upper) | |
98 | log_syntax(unit, LOG_WARNING, filename, line, 0, "Range '%s' is invalid, %u > %u", word, cpu_lower, cpu_upper); | |
99 | else | |
100 | for (cpu = cpu_lower; cpu <= cpu_upper; cpu++) | |
101 | CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c); | |
6300502b MP |
102 | } |
103 | ||
104 | /* On success, sets *cpu_set and returns ncpus for the system. */ | |
105 | if (c) { | |
106 | *cpu_set = c; | |
107 | c = NULL; | |
108 | } | |
109 | ||
110 | return (int) ncpus; | |
111 | } |