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// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "sysctl_helpers.h"
#include "test_progs.h"
int sysctl_set(const char *sysctl_path, char *old_val, const char *new_val)
{
int ret = 0;
FILE *fp;
fp = fopen(sysctl_path, "r+");
if (!fp)
return -errno;
if (old_val && fscanf(fp, "%s", old_val) <= 0) {
ret = -ENOENT;
} else if (!old_val || strcmp(old_val, new_val) != 0) {
fseek(fp, 0, SEEK_SET);
if (fprintf(fp, "%s", new_val) < 0)
ret = -errno;
}
fclose(fp);
return ret;
}
int sysctl_set_or_fail(const char *sysctl_path, char *old_val, const char *new_val)
{
int err;
err = sysctl_set(sysctl_path, old_val, new_val);
if (err)
PRINT_FAIL("failed to set %s to %s: %s\n", sysctl_path, new_val, strerror(-err));
return err;
}
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