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/*
* Copyright (C) 2013-2019 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if defined(__linux__)
static const int modes[] = {
#if defined(S_IFIFO)
S_IFIFO, /* FIFO */
#endif
#if defined(S_IFREG)
S_IFREG, /* Regular file */
#endif
#if defined(S_IFSOCK)
S_IFSOCK /* named socket */
#endif
};
/*
* stress_mknod_tidy()
* remove all files
*/
static void stress_mknod_tidy(
const args_t *args,
const uint64_t n)
{
uint64_t i;
for (i = 0; i < n; i++) {
char path[PATH_MAX];
const uint64_t gray_code = (i >> 1) ^ i;
(void)stress_temp_filename_args(args,
path, sizeof(path), gray_code);
(void)unlink(path);
}
}
/*
* stress_mknod
* stress mknod creates
*/
static int stress_mknod(const args_t *args)
{
const size_t num_nodes = SIZEOF_ARRAY(modes);
int ret;
if (num_nodes == 0) {
pr_err("%s: aborting, no valid mknod modes.\n",
args->name);
return EXIT_FAILURE;
}
ret = stress_temp_dir_mk_args(args);
if (ret < 0)
return exit_status(-ret);
do {
uint64_t i, n = DEFAULT_DIRS;
for (i = 0; i < n; i++) {
char path[PATH_MAX];
const uint64_t gray_code = (i >> 1) ^ i;
int mode = modes[mwc32() % num_nodes];
(void)stress_temp_filename_args(args,
path, sizeof(path), gray_code);
if (mknod(path, mode | S_IRUSR | S_IWUSR, 0) < 0) {
if ((errno == ENOSPC) || (errno == ENOMEM))
continue; /* Try again */
pr_fail_err("mknod");
n = i;
break;
}
if (!keep_stressing())
goto abort;
inc_counter(args);
}
stress_mknod_tidy(args, n);
if (!g_keep_stressing_flag)
break;
sync();
} while (keep_stressing());
abort:
/* force unlink of all files */
pr_tidy("%s: removing %" PRIu32 " nodes\n", args->name, DEFAULT_DIRS);
stress_mknod_tidy(args, DEFAULT_DIRS);
(void)stress_temp_dir_rm_args(args);
return EXIT_SUCCESS;
}
stressor_info_t stress_mknod_info = {
.stressor = stress_mknod,
.class = CLASS_FILESYSTEM | CLASS_OS
};
#else
stressor_info_t stress_mknod_info = {
.stressor = stress_not_implemented,
.class = CLASS_FILESYSTEM | CLASS_OS
};
#endif
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