63 lines
1.1 KiB
C++
63 lines
1.1 KiB
C++
/*
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* \brief C-library back end
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* \author Josef Soentgen
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* \date 2014-08-20
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*/
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/*
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* Copyright (C) 2014 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <base/printf.h>
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#include <util/string.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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namespace Libc {
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extern char const *config_rtc();
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time_t read_rtc();
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}
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time_t Libc::read_rtc()
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{
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time_t rtc = 0;
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if (!Genode::strcmp(Libc::config_rtc(), "")) {
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PWRN("%s: rtc not configured, returning %lu", __func__, rtc);
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return rtc;
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}
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int fd = open(Libc::config_rtc(), O_RDONLY);
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if (fd == -1) {
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PWRN("%s: %s not readable, returning %lu", __func__, Libc::config_rtc(), rtc);
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return rtc;
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}
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char buf[32];
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ssize_t n = read(fd, buf, sizeof(buf));
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if (n > 0) {
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buf[n - 1] = '\0';
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struct tm tm;
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Genode::memset(&tm, 0, sizeof(tm));
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if (strptime(buf, "%Y-%m-%d %R", &tm)) {
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rtc = mktime(&tm);
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if (rtc == (time_t)-1)
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rtc = 0;
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}
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}
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close(fd);
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return rtc;
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}
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