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/**
* util_dir_example - Example program for util_dir
*
* Copyright IBM Corp. 2016, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
//! [code]
#include <stdio.h>
#include <stdlib.h>
#include "lib/util_scandir.h"
/*
* Print real sysfs cpu directory contents
*/
static void show_cpu_dir(const char *sys_cpu_path)
{
char cmd_ls[256];
sprintf(cmd_ls, "ls -l %s", sys_cpu_path);
printf("$ %s\n", cmd_ls);
fflush(stdout);
if (system(cmd_ls)) {
perror("system() failed");
exit(EXIT_FAILURE);
}
printf("\n");
}
/*
* Show all CPUs on Linux system
*/
int main(void)
{
struct dirent **de_vec;
int count, i;
const char *path = "/sys/devices/system/cpu";
const char *prefix = "cpu";
show_cpu_dir(path);
/*
* Process all files that match regular expression "cpu[0-9]+"
* and sort them alphabetically. Note that the regular expression
* is constructed with a variable argument list.
*/
count = util_scandir(&de_vec, alphasort, path, "%s[0-9]+", prefix);
if (count == -1) {
perror("util_dir_scan failed");
return EXIT_FAILURE;
}
/* Print all directories */
printf("Found cpus:\n\n");
for (i = 0; i < count; i++) {
if (de_vec[i]->d_type != DT_DIR)
continue;
printf(" - %s\n", de_vec[i]->d_name);
}
/* Free directory entries */
util_scandir_free(de_vec, count);
return EXIT_SUCCESS;
}
//! [code]
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