----- Original Message -----
> From: "Jan Stancek" <[email protected]>
> To: "Caspar Zhang" <[email protected]>
> Cc: "LTP List" <[email protected]>
> Sent: Wednesday, 8 August, 2012 12:52:42 PM
> Subject: Re: [LTP] [PATCH 1/4] syscall/process_vm_readv02: new testcase
>
> Hi Caspar,
>
> + if (TEST_RETURN != len)
> + tst_brkm(TBROK|TERRNO, tst_exit, "process_vm_readv");
> Shouldn't this be TFAIL? Can it also print TEST_RETURN?
>
> + lp = SAFE_MALLOC(tst_exit, len + 1);
> + local.iov_base = lp;
> + local.iov_len = len;
> + remote.iov_base = rp;
> + remote.iov_len = len;
> +
> + tst_resm(TINFO, "child 1: reading string from same memory
> location.");
> + TEST(test_process_vm_readv(pids[0], &local, 1, &remote, 1, 0));
> + if (TEST_RETURN != len)
> + tst_brkm(TBROK|TERRNO, tst_exit, "process_vm_readv");
> + if (strcmp(lp, tst_string) != 0)
> + tst_brkm(TFAIL, tst_exit, "child 1: expected string: %s, "
> + "received string: %s", tst_string, lp);
> I think SAFE_MALLOC is not initialising memory. So if "lp[len] != 0"
> strcmp will fail.
>
> +#if !defined(__NR_process_vm_readv)
> + tst_brkm(TCONF, NULL, "process_vm_writev does not exist "
> + "on your system");
> Message says "process_vm_writev", testcase is for "process_vm_readv".
+ tst_brkm(TBROK|TERRNO, cleanup, "fork #0");
Both messages about broken fork are "fork #0".
SIGSTOP/SIGCONT approach seems prone to races: if other child
is able to finish before first one raises SIGSTOP, then SIGCONT
arrives first. For example, let's put small sleep before SIGSTOP
in child_alloc() and child will never finish:
sleep(2);
if (raise(SIGSTOP) < 0)
tst_brkm(TBROK|TERRNO, tst_exit, "raise");
The testcase still gives PASS, but one of children is now hanging
in background:
5399 pts/0 T 0:00 ./process_vm_readv02
Regards,
Jan
>
> Regards,
> Jan
>
> ----- Original Message -----
> > From: "Caspar Zhang" <[email protected]>
> > To: "LTP List" <[email protected]>
> > Sent: Wednesday, 8 August, 2012 11:26:54 AM
> > Subject: [LTP] [PATCH 1/4] syscall/process_vm_readv02: new testcase
> >
> >
> > This testcase is one of the simple CMA syscalls (process_vm_readv,
> > process_vm_writev) tests originally written by Chris Yeoh
> > <[email protected]>. I made some modifications to make it match the
> > code
> > style in LTP.
> >
> > Test Assertion and Strategy:
> >
> > Fork two children, one child allocates memory and initializes
> > it;
> > then the other one calls process_vm_readv and reads from the
> > same
> > memory location, it then verifies if process_vm_readv returns
> > correct data.
> >
> > Signed-off-by: Caspar Zhang <[email protected]>
> > ---
> > testcases/kernel/syscalls/cma/process_vm_readv02.c | 162
> > ++++++++++++++++++++
> > 1 files changed, 162 insertions(+), 0 deletions(-)
> > create mode 100644
> > testcases/kernel/syscalls/cma/process_vm_readv02.c
> >
> >
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