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https://github.com/ibm-s390-linux/s390-tools.git
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fed79474e4
Use util_path_sysfs() to form a fully qualified sysfs file name for files S390_CPUMF_CF, S390_CPUMF_CFDIAG, S390_CPUMF_SF, S390_SYSFS_PAI_CRYPTO and S390_SYSFS_PAI_EXT. 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>
70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
/* Copyright IBM Corp. 2022, 2025
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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 <err.h>
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#include <errno.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/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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#include "lib/util_scandir.h"
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#include "lib/libcpumf.h"
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int libcpumf_pmutype(const char *dirname)
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{
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int ret = -1;
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FILE *file;
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char *fn;
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fn = util_path_sysfs("%s/type", dirname);
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file = fopen(fn, "r");
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free(fn);
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if (file) {
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/* Read out a single number from that file */
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if (fscanf(file, "%u", &ret) != 1)
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/* Unexpected format error, set errno */
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errno = -ERANGE;
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fclose(file);
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}
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return ret;
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}
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int libcpumf_pmuname(unsigned int wanted_type, char **name)
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{
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struct dirent **de_vec;
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unsigned int type;
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char *dirname;
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char *path;
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int count;
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int rc;
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path = util_path_sysfs("devices");
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count = util_scandir(&de_vec, alphasort, path, "(pai|cpum_).*");
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free(path);
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*name = NULL;
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for (int i = 0; i < count; i++) {
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if (de_vec[i]->d_type == DT_DIR) {
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dirname = de_vec[i]->d_name;
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path = util_path_sysfs("devices/%s/type", dirname);
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rc = util_file_read_ui(&type, 10, path);
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if (rc)
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warn("Failed to open %s", path);
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free(path);
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if (!rc && type == wanted_type) {
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*name = util_strdup(dirname);
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goto out;
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}
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}
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}
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out:
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util_scandir_free(de_vec, count);
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return *name ? 0 : -1;
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}
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