/*
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* Copyright 2018 Andreas Scheider <asn@cryptomilk.org>
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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 <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <unistd.h>
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#include "proc_uptime.h"
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#define UPTIME_FILE "/proc/uptime"
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int uptime(const char *uptime_path, double *uptime_secs, double *idle_secs)
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{
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double up = 0;
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double idle = 0;
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char *savelocale = NULL;
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char buf[1024] = {0};
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ssize_t nread;
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int fd = -1;
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int rc;
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if (uptime_path == NULL) {
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uptime_path = UPTIME_FILE;
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}
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fd = open(uptime_path, O_RDONLY);
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if (fd < 0) {
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return 0;
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}
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nread = read(fd, buf, sizeof(buf));
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close(fd);
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if (nread < 0) {
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return 0;
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}
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savelocale = strdup(setlocale(LC_NUMERIC, NULL));
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if (savelocale == NULL) {
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return 0;
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}
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setlocale(LC_NUMERIC, "C");
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rc = sscanf(buf, "%lf %lf", &up, &idle);
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setlocale(LC_NUMERIC, savelocale);
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free(savelocale);
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if (rc < 2) {
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errno = EFAULT;
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return 0;
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}
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if (uptime_secs != NULL) {
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*uptime_secs = up;
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}
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if (idle_secs != NULL) {
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*idle_secs = idle;
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}
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return (int)up;
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}
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