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63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* Copyright (C) 2011-2022 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Richard McConnell <richard_mcconnell@rapid7.com>
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*
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* Sysfs utility file
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*/
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#include "util-sysfs.h"
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#define SYSFS_MAX_FILENAME_LEN (SYSFS_MAX_FILENAME_SIZE + 5)
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TmEcode SysFsWriteValue(const char *path, int64_t value)
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{
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#if defined(__linux__)
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char fname[SYSFS_MAX_FILENAME_LEN] = "/sys/";
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char sentence[64];
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if (!path || strlen(path) > SYSFS_MAX_FILENAME_SIZE) {
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SCLogWarning("File path too long, max allowed: %d", SYSFS_MAX_FILENAME_SIZE);
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SCReturnInt(TM_ECODE_FAILED);
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}
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strlcat(fname, path, sizeof(fname));
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/* File must be present and process have correct capabilities to open */
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int fd = open(fname, O_WRONLY);
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if (fd < 0) {
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SCLogError("Could not open file: %s", fname);
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SCReturnInt(TM_ECODE_FAILED);
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}
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snprintf(sentence, sizeof(sentence), "%ld", value);
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ssize_t len = strlen(sentence);
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if (write(fd, sentence, len) != len) {
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SCLogError("Could not write to file: %s", fname);
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close(fd);
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SCReturnInt(TM_ECODE_FAILED);
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}
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close(fd);
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#endif /* __LINUX__ */
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SCReturnInt(TM_ECODE_OK);
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}
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