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5ec008a2bd
The functions qemu_get_timedate() and qemu_timedate_diff() take and return a time offset as an integer. Coverity points out that means that when an RTC device implementation holds an offset as a time_t, as the m48t59 does, the time_t will get truncated. (CID 1507157, 1517772). The functions work with time_t internally, so make them use that type in their APIs. Note that this won't help any Y2038 issues where either the device model itself is keeping the offset in a 32-bit integer, or where the hardware under emulation has Y2038 or other rollover problems. If we missed any cases of the former then hopefully Coverity will warn us about them since after this patch we'd be truncating a time_t in assignments from qemu_timedate_diff().) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
59 lines
2.4 KiB
C
59 lines
2.4 KiB
C
/*
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* RTC configuration and clock read
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*
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* Copyright (c) 2003-2021 QEMU contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef SYSEMU_RTC_H
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#define SYSEMU_RTC_H
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/**
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* qemu_get_timedate: Get the current RTC time
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* @tm: struct tm to fill in with RTC time
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* @offset: offset in seconds to adjust the RTC time by before
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* converting to struct tm format.
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*
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* This function fills in @tm with the current RTC time, as adjusted
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* by @offset (for example, if @offset is 3600 then the returned time/date
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* will be one hour further ahead than the current RTC time).
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*
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* The usual use is by RTC device models, which should call this function
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* to find the time/date value that they should return to the guest
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* when it reads the RTC registers.
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*
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* The behaviour of the clock whose value this function returns will
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* depend on the -rtc command line option passed by the user.
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*/
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void qemu_get_timedate(struct tm *tm, time_t offset);
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/**
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* qemu_timedate_diff: Return difference between a struct tm and the RTC
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* @tm: struct tm containing the date/time to compare against
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*
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* Returns the difference in seconds between the RTC clock time
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* and the date/time specified in @tm. For example, if @tm specifies
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* a timestamp one hour further ahead than the current RTC time
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* then this function will return 3600.
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*/
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time_t qemu_timedate_diff(struct tm *tm);
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#endif
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