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authorLennart Poettering <lennart@poettering.net>2015-09-30 21:50:22 +0200
committerLennart Poettering <lennart@poettering.net>2015-09-30 22:26:16 +0200
commit618234a5258768359cb1086b152c5f08aaf89754 (patch)
tree2fb6f9820ff043bc5a6a615d343bcfebf6a6cfad /src/basic/cpu-set-util.c
parent94d75d6423f16f1fb66d214cb640ae3a114c5c58 (diff)
basic: split out cpu set specific APIs into cpu-set-util.[ch]
Diffstat (limited to 'src/basic/cpu-set-util.c')
-rw-r--r--src/basic/cpu-set-util.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/src/basic/cpu-set-util.c b/src/basic/cpu-set-util.c
new file mode 100644
index 0000000000..519583c167
--- /dev/null
+++ b/src/basic/cpu-set-util.c
@@ -0,0 +1,105 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 "util.h"
+#include "cpu-set-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;
+ int r;
+
+ r = extract_first_word(&rvalue, &word, WHITESPACE, EXTRACT_QUOTES);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue);
+ return r;
+ }
+ if (r == 0)
+ break;
+
+ if (!c) {
+ c = cpu_set_malloc(&ncpus);
+ if (!c)
+ return log_oom();
+ }
+
+ r = safe_atou(word, &cpu);
+ if (r < 0 || cpu >= ncpus) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse CPU affinity '%s'", rvalue);
+ return -EINVAL;
+ }
+
+ 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;
+}