123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/*
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* Copyright (C) 2018 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <malloc.h>
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#include "fsutils.h"
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#include "startupreason.h"
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#include "log_sys.h"
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#define CURRENT_KERNEL_CMDLINE "/proc/cmdline"
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static int get_cmdline_bootreason(char *bootreason, const size_t limit)
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{
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int res;
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unsigned long size;
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char *start, *p1, *p2, *end;
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char *cmdline;
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const char *key = "ABL.reset=";
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res = read_file(CURRENT_KERNEL_CMDLINE, &size, (void *)&cmdline);
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if (res < 0) {
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LOGE("failed to read file %s - %s\n",
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CURRENT_KERNEL_CMDLINE, strerror(errno));
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return -1;
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}
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if (!size) {
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LOGW("empty file (%s)\n", CURRENT_KERNEL_CMDLINE);
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return 0;
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}
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start = strstr(cmdline, key);
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if (!start) {
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LOGW("can't find reboot reason with key (%s) in cmdline\n",
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key);
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free(cmdline);
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return 0;
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}
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/* if the string contains ' ' or '\n', break it by '\0' */
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start += strlen(key);
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p1 = strchr(start, ' ');
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p2 = strchr(start, '\n');
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if (p2 && p1)
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end = MIN(p1, p2);
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else
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end = MAX(p1, p2);
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if (!end)
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end = cmdline + size;
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const size_t len = MIN((size_t)(end - start), (size_t)(limit - 1));
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if (len > 0) {
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memcpy(bootreason, start, len);
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*(bootreason + len) = 0;
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}
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free(cmdline);
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return len;
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}
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static int get_default_bootreason(char *bootreason, const size_t limit)
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{
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int len;
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int i;
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len = get_cmdline_bootreason(bootreason, limit);
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if (len <= 0)
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return len;
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for (i = 0; i < len; i++)
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bootreason[i] = toupper(bootreason[i]);
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return len;
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}
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void read_startupreason(char *startupreason, const size_t limit)
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{
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int res;
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static char reboot_reason_cache[REBOOT_REASON_SIZE];
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if (!startupreason || !limit)
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return;
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if (!reboot_reason_cache[0]) {
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/* fill cache */
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res = get_default_bootreason(reboot_reason_cache,
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sizeof(reboot_reason_cache));
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if (res <= 0)
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strncpy(reboot_reason_cache, "UNKNOWN",
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sizeof(reboot_reason_cache));
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}
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const size_t len = MIN(strnlen(reboot_reason_cache, REBOOT_REASON_SIZE),
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limit - 1);
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memcpy(startupreason, reboot_reason_cache, len);
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*(startupreason + len) = 0;
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return;
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}
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