[LTP] [PATCH v2 3/3] syscalls/clock_adjtime: create clock_adjtime syscall tests

[Rafael David Tinoco]

> On 21 Mar 2019, at 10:54, Cyril Hrubis <chrubis@suse.cz> wrote:
> 
> Hi!
> This test fails for me and clock_adjtime() returns 5 (TIME_ERROR) for me.
> 
> Looks like the SAFE_ADJTIME() should fail only on rval < 0 and return the rval
> too so that we can possibly make use of the return value, the test passes for
> me with:
> 
> diff --git a/include/tst_safe_clocks.h b/include/tst_safe_clocks.h
> index a952be4bf..f7776a548 100644
> --- a/include/tst_safe_clocks.h
> +++ b/include/tst_safe_clocks.h
> @@ -46,16 +46,18 @@ static inline void safe_clock_settime(const char *file, const int lineno,
>                        "%s:%d clock_gettime() failed", file, lineno);
> }
> 
> -static inline void safe_clock_adjtime(const char *file, const int lineno,
> +static inline int safe_clock_adjtime(const char *file, const int lineno,
>        clockid_t clk_id, struct timex *txc)
> {
>        int rval;
> 
>        rval = tst_syscall(__NR_clock_adjtime, clk_id, txc);
> 
> -       if (rval != 0)
> +       if (rval < 0)
>                tst_brk(TBROK | TERRNO,
> -                       "%s:%d clock_adjtime() failed", file, lineno);
> +                       "%s:%d clock_adjtime() failed %i", file, lineno, rval);
> +
> +       return rval;
> }
> 
> 
> Also we should restore the adjtimex only if we actually managed to save it,
> with something as:
> 
> diff --git a/testcases/kernel/syscalls/clock_adjtime/clock_adjtime01.c b/testcases/kernel/syscalls/clock_adjtime/clock_adjtime01.c
> index 48cfbe6c5..6eb823387 100644
> --- a/testcases/kernel/syscalls/clock_adjtime/clock_adjtime01.c
> +++ b/testcases/kernel/syscalls/clock_adjtime/clock_adjtime01.c
> @@ -58,6 +58,7 @@
> 
> static long hz;
> static struct timex saved, ttxc;
> +static int clock_saved;
> 
> struct test_case {
>        unsigned int modes;
> @@ -165,10 +166,13 @@ static void verify_clock_adjtime(unsigned int i)
> static void setup(void)
> {
>        size_t i;
> +       int rval;
> 
>        /* save original clock flags */
> 
> -       SAFE_CLOCK_ADJTIME(CLOCK_REALTIME, &saved);
> +       rval = SAFE_CLOCK_ADJTIME(CLOCK_REALTIME, &saved);
> +       clock_saved = 1;
> +       tst_res(TINFO, "clock_adjtime() = %i", rval);
> 
>        hz = SAFE_SYSCONF(_SC_CLK_TCK);
> 
> @@ -203,7 +207,8 @@ static void cleanup(void)
> 
>        /* restore original clock flags */
> 
> -       SAFE_CLOCK_ADJTIME(CLOCK_REALTIME, &saved);
> +       if (clock_saved)
> +               SAFE_CLOCK_ADJTIME(CLOCK_REALTIME, &saved);
> }
> 
> static struct tst_test test = {

Alright, will send a v3, sorry about that.