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Re: [PATCH v2 12/12] linux-user: fix clock_nanosleep()
From: |
Laurent Vivier |
Subject: |
Re: [PATCH v2 12/12] linux-user: fix clock_nanosleep() |
Date: |
Wed, 22 Jul 2020 14:03:26 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 |
Le 22/07/2020 à 10:55, Alex Bennée a écrit :
>
> Laurent Vivier <laurent@vivier.eu> writes:
>
>> Le 22/07/2020 à 08:29, Alex Bennée a écrit :
>>> From: Laurent Vivier <laurent@vivier.eu>
>>>
>>> If clock_nanosleep() encounters an error, it returns one of the positive
>>> error number.
>>>
>>> If the call is interrupted by a signal handler, it fails with error EINTR
>>> and if "remain" is not NULL and "flags" is not TIMER_ABSTIME, it returns
>>> the remaining unslept time in "remain".
>>>
>>> Update linux-user to not overwrite the "remain" structure if there is no
>>> error.
>>>
>>> Found with "make check-tcg", linux-test fails on nanosleep test:
>>>
>>> TEST linux-test on x86_64
>>> .../tests/tcg/multiarch/linux-test.c:242: nanosleep
>>> make[2]: *** [../Makefile.target:153: run-linux-test] Error 1
>>> make[1]: *** [.../tests/tcg/Makefile.qemu:76: run-guest-tests] Error 2
>>> make: *** [.../tests/Makefile.include:857: run-tcg-tests-x86_64-linux-user]
>>> Error 2
>>>
>>> Reported-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>>> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
>>> Message-Id: <20200721201754.2731479-1-laurent@vivier.eu>
>>> ---
>>> linux-user/syscall.c | 15 ++++++++++++---
>>> 1 file changed, 12 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
>>> index 1211e759c26..caa7cd3cab9 100644
>>> --- a/linux-user/syscall.c
>>> +++ b/linux-user/syscall.c
>>> @@ -11829,10 +11829,19 @@ static abi_long do_syscall1(void *cpu_env, int
>>> num, abi_long arg1,
>>> {
>>> struct timespec ts;
>>> target_to_host_timespec(&ts, arg3);
>>> - ret = get_errno(safe_clock_nanosleep(arg1, arg2,
>>> - &ts, arg4 ? &ts : NULL));
>>> - if (arg4)
>>> + /*
>>> + * clock_nanosleep() returns 0 or one of the *positive* error
>>> number.
>>> + */
>>> + ret = host_to_target_errno(safe_clock_nanosleep(arg1, arg2, &ts,
>>> + arg4 ? &ts :
>>> NULL));
>>> + /*
>>> + * if the call is interrupted by a signal handler, it fails
>>> + * with error TARGET_EINTR and if arg4 is not NULL and arg2 is not
>>> + * TIMER_ABSTIME, it returns the remaining unslept time in arg4.
>>> + */
>>> + if (ret == TARGET_EINTR && arg4 && arg2 != TIMER_ABSTIME) {
>>> host_to_target_timespec(arg4, &ts);
>>> + }
>>>
>>> #if defined(TARGET_PPC)
>>> /* clock_nanosleep is odd in that it returns positive errno values.
>>>
>>
>> Wait a little before pushing that: I've made more tests and it seems to
>> break something in LTP. I have to analyze.
>
> OK - which LTP test does it break?
clock_nanosleep01
>
> I can drop from the PR if we don't have a clean-up by then (Fri?).
I have a fix. I'm testing it. I will send the v2 today.
https://github.com/vivier/qemu/commit/25060f425e71c57112a334d9930f234011d079a1
Thanks,
Laurent
- Re: [PATCH v2 08/12] linux-user: don't use MAP_FIXED in pgd_find_hole_fallback, (continued)
- [PATCH v2 09/12] tests/docker: fix update command due to python3 str/bytes distinction, Alex Bennée, 2020/07/22
- [PATCH v2 10/12] tests/docker: fix binfmt_misc image building, Alex Bennée, 2020/07/22
- [PATCH v2 07/12] target/i386: floatx80: avoid compound literals in static initializers, Alex Bennée, 2020/07/22
- [PATCH v2 12/12] linux-user: fix clock_nanosleep(), Alex Bennée, 2020/07/22
- Re: [PATCH v2 12/12] linux-user: fix clock_nanosleep(), Philippe Mathieu-Daudé, 2020/07/22
- [PATCH v2 11/12] tests/docker: add support for DEB_KEYRING, Alex Bennée, 2020/07/22