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https://github.com/ibm-s390-linux/s390-tools.git
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7e832ead9e
Use util_path_sysfs() to form a fully qualified sysfs file name for file S390_CPUS_ONLINE. No functional change. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/* Copyright IBM Corp. 2022
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <errno.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lib/libcpumf.h"
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#include "lib/util_file.h"
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#include "lib/util_libc.h"
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#include "lib/util_path.h"
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int libcpumf_cpuset(const char *parm, cpu_set_t *mask)
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{
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char *cp, *buffer = util_strdup(parm);
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char *cp2 = buffer;
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int to, from, rc;
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/* Check for invalid characters, such as 11.12 instead 11-12
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* but allow blanks and newline. Newline is appended
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* when the string is taken from sysfs files, for example
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* /sys/devices/system/cpu/online
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*/
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if (strspn(buffer, "0123456789-,\n ") != strlen(buffer)) {
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errno = EINVAL;
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rc = -1;
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goto out;
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}
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CPU_ZERO(mask);
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for (; (cp = strtok(buffer, ",")); buffer = NULL) {
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char *dash = strchr(cp, '-'); /* Range character? */
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bool is_ok;
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if (dash) {
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rc = sscanf(cp, "%d-%d", &from, &to);
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is_ok = rc == 2;
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} else {
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rc = sscanf(cp, "%d", &to);
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from = to;
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is_ok = rc == 1;
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}
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if (!is_ok) {
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errno = ERANGE;
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rc = -1;
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goto out;
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}
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for (; from <= to; ++from)
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CPU_SET(from, mask);
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}
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rc = 0;
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out:
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free(cp2);
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return rc;
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}
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int libcpumf_cpuset_fn(const char *filename, cpu_set_t *mask)
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{
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char *path = util_path_sysfs(filename);
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char txt[PATH_MAX];
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int ret = util_file_read_line(txt, sizeof(txt), "%s", path);
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free(path);
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/* Read out file, one line expected */
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if (!ret)
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ret = libcpumf_cpuset(txt, mask);
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return ret;
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}
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