100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <stddef.h>
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#include <syslog.h>
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#include "alloc-util.h"
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#include "cpu-set-util.h"
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#include "extract-word.h"
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#include "log.h"
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#include "macro.h"
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#include "parse-util.h"
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#include "string-util.h"
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cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
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cpu_set_t *c;
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unsigned n = 1024;
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/* Allocates the cpuset in the right size */
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for (;;) {
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c = CPU_ALLOC(n);
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if (!c)
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return NULL;
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if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), c) >= 0) {
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CPU_ZERO_S(CPU_ALLOC_SIZE(n), c);
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if (ncpus)
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*ncpus = n;
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return c;
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}
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CPU_FREE(c);
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if (errno != EINVAL)
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return NULL;
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n *= 2;
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}
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}
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int parse_cpu_set_internal(
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const char *rvalue,
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cpu_set_t **cpu_set,
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bool warn,
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const char *unit,
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const char *filename,
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unsigned line,
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const char *lvalue) {
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_cleanup_cpu_free_ cpu_set_t *c = NULL;
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const char *p = rvalue;
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unsigned ncpus = 0;
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assert(rvalue);
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for (;;) {
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_cleanup_free_ char *word = NULL;
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unsigned cpu, cpu_lower, cpu_upper;
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int r;
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r = extract_first_word(&p, &word, WHITESPACE ",", EXTRACT_QUOTES);
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if (r == -ENOMEM)
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return warn ? log_oom() : -ENOMEM;
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if (r < 0)
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return warn ? log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, rvalue) : r;
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if (r == 0)
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break;
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if (!c) {
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c = cpu_set_malloc(&ncpus);
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if (!c)
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return warn ? log_oom() : -ENOMEM;
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}
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r = parse_range(word, &cpu_lower, &cpu_upper);
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if (r < 0)
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return warn ? log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse CPU affinity '%s'", word) : r;
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if (cpu_lower >= ncpus || cpu_upper >= ncpus)
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return warn ? log_syntax(unit, LOG_ERR, filename, line, EINVAL, "CPU out of range '%s' ncpus is %u", word, ncpus) : -EINVAL;
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if (cpu_lower > cpu_upper) {
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if (warn)
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log_syntax(unit, LOG_WARNING, filename, line, 0, "Range '%s' is invalid, %u > %u, ignoring", word, cpu_lower, cpu_upper);
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continue;
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}
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for (cpu = cpu_lower; cpu <= cpu_upper; cpu++)
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CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
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}
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/* On success, sets *cpu_set and returns ncpus for the system. */
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if (c)
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*cpu_set = TAKE_PTR(c);
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return (int) ncpus;
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}
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