[v2,2/3] support: Provide xclock_settime test helper function
Commit Message
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.
---
support/Makefile | 1 +
support/xclock_settime.c | 35 +++++++++++++++++++++++++++++++++++
support/xtime.h | 5 +++++
3 files changed, 41 insertions(+)
create mode 100644 support/xclock_settime.c
@@ -90,6 +90,7 @@ libsupport-routines = \
xchdir \
xchroot \
xclock_gettime \
+ xclock_settime \
xclose \
xchmod \
xconnect \
new file mode 100644
@@ -0,0 +1,35 @@
+/* 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>
+#include <support/xthread.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");
+
+ const int ret = clock_settime (clockid, ts);
+ if (ret < 0)
+ FAIL_EXIT1 ("clock_settime (%d): %m", clockid);
+}
@@ -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. */