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/***
This file is part of systemd.
Copyright 2010-2015 Lennart Poettering
Copyright 2015 Filipe Brandenburger
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 <stddef.h>
#include <syslog.h>
#include "alloc-util.h"
#include "cpu-set-util.h"
#include "extract-word.h"
#include "log.h"
#include "macro.h"
#include "parse-util.h"
#include "string-util.h"
cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
cpu_set_t *c;
unsigned n = 1024;
/* Allocates the cpuset in the right size */
for (;;) {
c = CPU_ALLOC(n);
if (!c)
return NULL;
if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), c) >= 0) {
CPU_ZERO_S(CPU_ALLOC_SIZE(n), c);
if (ncpus)
*ncpus = n;
return c;
}
CPU_FREE(c);
if (errno != EINVAL)
return NULL;
n *= 2;
}
}
int parse_cpu_set_and_warn(
const char *rvalue,
cpu_set_t **cpu_set,
const char *unit,
const char *filename,
unsigned line,
const char *lvalue) {
const char *whole_rvalue = rvalue;
_cleanup_cpu_free_ cpu_set_t *c = NULL;
unsigned ncpus = 0;
assert(lvalue);
assert(rvalue);
for (;;) {
_cleanup_free_ char *word = NULL;
unsigned cpu, cpu_lower, cpu_upper;
int r;
r = extract_first_word(&rvalue, &word, WHITESPACE ",", EXTRACT_QUOTES);
if (r < 0)
return log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue);
if (r == 0)
break;
if (!c) {
c = cpu_set_malloc(&ncpus);
if (!c)
return log_oom();
}
r = parse_range(word, &cpu_lower, &cpu_upper);
if (r < 0)
return log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse CPU affinity '%s'", word);
if (cpu_lower >= ncpus || cpu_upper >= ncpus)
return log_syntax(unit, LOG_ERR, filename, line, EINVAL, "CPU out of range '%s' ncpus is %u", word, ncpus);
if (cpu_lower > cpu_upper)
log_syntax(unit, LOG_WARNING, filename, line, 0, "Range '%s' is invalid, %u > %u", word, cpu_lower, cpu_upper);
else
for (cpu = cpu_lower; cpu <= cpu_upper; cpu++)
CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
}
/* On success, sets *cpu_set and returns ncpus for the system. */
if (c) {
*cpu_set = c;
c = NULL;
}
return (int) ncpus;
}
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