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support: Provide xclock_settime test helper function

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The xclock_settime is a wrapper function on the clock_settime syscall
to be used in the test code.

It checks if the GLIBC_TEST_ALLOW_TIME_SETTING env variable is defined
in the environment in which test is executed. If it is not - the test
ends as unsupported. Otherwise, the clock-settime is executed and return
value is assessed.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski 2021-01-18 16:53:26 +01:00
parent 496e36f225
commit a156555007
3 changed files with 40 additions and 0 deletions
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1
support/Makefile
View File

@ -90,6 +90,7 @@ libsupport-routines = \
xchdir \
xchroot \
xclock_gettime \
xclock_settime \
xclose \
xchmod \
xconnect \

34
support/xclock_settime.c Normal file
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@ -0,0 +1,34 @@
/* clock_settime with error checking.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <support/check.h>
#include <support/xtime.h>
void
xclock_settime (clockid_t clockid,
const struct timespec *ts)
{
if (getenv (SETTIME_ENV_NAME) == NULL)
FAIL_UNSUPPORTED ("clock_settime is executed only when "\
SETTIME_ENV_NAME" is set\n");
int ret = clock_settime (clockid, ts);
if (ret < 0)
FAIL_EXIT1 ("clock_settime (%d): %m", clockid);
}

5
support/xtime.h
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@ -23,10 +23,15 @@
__BEGIN_DECLS
/* Name of the env variable, which indicates if it is possible to
adjust time on target machine. */
#define SETTIME_ENV_NAME "GLIBC_TEST_ALLOW_TIME_SETTING"
/* The following functions call the corresponding libc functions and
terminate the process on error. */
void xclock_gettime (clockid_t clock, struct timespec *ts);
void xclock_settime (clockid_t clock, const struct timespec *ts);
/* This helper can often simplify tests by avoiding an explicit
variable declaration or allowing that declaration to be const. */