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-rw-r--r--src/libbasic/cpu-set-util.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/src/libbasic/cpu-set-util.c b/src/libbasic/cpu-set-util.c
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+++ b/src/libbasic/cpu-set-util.c
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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;
+}