On Sat, Nov 28, 2009 at 5:22 PM, Wei Yongjun <yj...@cn.fujitsu.com> wrote:
>
>
> Garrett Cooper wrote:
>> On Fri, Nov 27, 2009 at 2:07 AM, liubo <liubo2...@cn.fujitsu.com> wrote:
>>
>>> Hi, Garrett
>>>
>>> On 11/27/2009 04:50 PM, Garrett Cooper wrote:
>>>
>>> On Thu, Nov 26, 2009 at 10:49 PM, Garrett Cooper <yaneg...@gmail.com> wrote:
>>>
>>>
>>> On Thu, Nov 26, 2009 at 9:33 PM, liubo <liubo2...@cn.fujitsu.com> wrote:
>>>
>>>
>>> Hi, Garrett
>>> On 11/26/2009 07:11 PM, Garrett Cooper wrote:
>>>
>>> On Mon, Nov 16, 2009 at 12:53 AM, liubo <liubo2...@cn.fujitsu.com> wrote:
>>>
>>>
>>> Hi, Subrata,
>>> On 11/16/2009 04:13 PM, Subrata Modak wrote:
>>>
>>> Liubo,
>>>
>>> Are you sending an updated patch post this discussion ?
>>>
>>>
>>>
>>> Yes, I'll resend a updated patch about these rt_sigs.
>>>
>>> Regards--
>>> Liubo
>>>
>>> Regards--
>>> Subrata
>>>
>>> On Wed, 2009-11-11 at 13:03 +0800, Wei Yongjun wrote:
>>>
>>>
>>> Mike Frysinger wrote:
>>>
>>>
>>> On Tuesday 10 November 2009 04:38:30 liubo wrote:
>>>
>>>
>>>
>>> 1) rt_sigaction
>>> "sigaction" has the structure:
>>>
>>> struct sigaction {
>>> __sighandler_t sa_handler;
>>> unsigned long sa_flags;
>>> #ifdef SA_RESTORER
>>> __sigrestore_t sa_restorer;
>>> #endif
>>> sigset_t sa_mask; /* mask last for extensibility */
>>> };
>>>
>>> However, on arch x86_64, if we directly get to call rt_sigaction,
>>> the argument "sa_restorer" will not be fulfilled, and this will lead
>>> to segment fault.
>>> on arch x86_64, if sa_restorer is not set, kernel will lead to segment
>>> fault. In other arch, if sa_restorer is not set, kernel can do the correct
>>> work. To avoid this segment fault, we use glibc function
>>> "int sigaction(...);" instead, which can fulfill the argument
>>> "sa_restorer".
>>>
>>>
>>>
>>> which defeats the purpose of the test. there is no guarantee that the C
>>> library sigaction function is implemented via the __NR_rt_sigaction syscall.
>>>
>>>
>>>
>>> In x86_64, it do this. And If we want to use __NR_rt_sigaction syscall
>>> directly, we must fill the sa_restorer and set the RESTORER flag to
>>> sa_mask. If we do not set the sa_restorer, kill will always cause
>>> segment fault.
>>>
>>>
>>>
>>>
>>>
>>>
>>> 2) rt_sigprocmask
>>> This failure contains two aspects,
>>> the first is the segment fault as described in 1),
>>> the second is that testcase uses a unknown signal 33 for test,
>>> and this will lead sigaction cannot bind signal 33 to the action.
>>>
>>> So, we attempt to use a known signal instead, such as 34.
>>>
>>>
>>>
>>> which is just as bogus and unportable. if the test needs a real time
>>> signal,
>>> it should leverage the sigrtmin...sigrtmax defines.
>>> -mike
>>>
>>>
>>> I see what you mean about this testcase segfaulting now.
>>>
>>> I've done some exploring, and while sigaction does map to rt_sigaction
>>> on ia64 and x86_64, it won't on arm, mips, s390*, sh, or x86.
>>>
>>> Furthermore, the problem is actually being caused by the fact that
>>> we're not even calling sigaddset properly!
>>>
>>> gcoo...@orangebox
>>> /scratch/ltp-dev2/ltp/testcases/kernel/syscalls/rt_sigaction $ gdb
>>> ./rt_sigaction01
>>> GNU gdb 6.8
>>> Copyright (C) 2008 Free Software Foundation, Inc.
>>> License GPLv3+: GNU GPL version 3 or later
>>> <http://gnu.org/licenses/gpl.html>
>>> This is free software: you are free to change and redistribute it.
>>> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
>>> and "show warranty" for details.
>>> This GDB was configured as "x86_64-pc-linux-gnu"...
>>> (gdb) c
>>> The program is not being run.
>>> (gdb) r
>>> Starting program:
>>> /scratch/ltp-dev2/ltp/testcases/kernel/syscalls/rt_sigaction/rt_sigaction01
>>> thread:20
>>> [Thread debugging using libthread_db enabled]
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 1 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 2 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 3 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 4 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 5 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 6 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 7 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 8 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 9 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 10 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 11 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 12 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 13 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 14 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 15 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 16 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 17 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 18 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 19 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 20 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 21 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 22 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 23 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 24 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 25 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 26 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 27 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 28 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 29 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>>> rt_sigaction01 30 TFAIL : rt_sigaction01 failed:
>>> TEST_ERRNO=EINVAL(22): Invalid argument
>>>
>>> So, the test needs fixing, anyhow. After I fixed it, the test still
>>> segfaulted >:( --
>>>
>>> gcoo...@orangebox
>>> /scratch/ltp-dev2/ltp/testcases/kernel/syscalls/rt_sigaction $ gdb
>>> ./rt_sigaction01
>>> GNU gdb 6.8
>>> Copyright (C) 2008 Free Software Foundation, Inc.
>>> License GPLv3+: GNU GPL version 3 or later
>>> <http://gnu.org/licenses/gpl.html>
>>> This is free software: you are free to change and redistribute it.
>>> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
>>> and "show warranty" for details.
>>> This GDB was configured as "x86_64-pc-linux-gnu"...
>>> (gdb) r
>>> Starting program:
>>> /scratch/ltp-dev2/ltp/testcases/kernel/syscalls/rt_sigaction/rt_sigaction01
>>> thread:20
>>> [Thread debugging using libthread_db enabled]
>>> rt_sigaction01 0 TINFO : signal: 34
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> [New Thread 0x7fdd451d66f0 (LWP 31927)]
>>>
>>> Program received signal SIG34, Real-time event 34.
>>> [Switching to Thread 0x7fdd451d66f0 (LWP 31927)]
>>> 0x00007fdd448944f7 in kill () from /lib/libc.so.6
>>> (gdb) c
>>> Continuing.
>>>
>>> Program received signal SIGSEGV, Segmentation fault.
>>> 0x00007fdd448944f7 in kill () from /lib/libc.so.6
>>>
>>> So I tried to do some digging. glibc 2.8-20080602 does the following
>>> for alpha, i386, and sysv:
>>>
>>> result = INLINE_SYSCALL (rt_sigaction, 4,
>>> sig, act ? __ptrvalue (&kact) : NULL,
>>> oact ? __ptrvalue (&koact) : NULL, _NSIG /
>>> 8);
>>>
>>> The kernel code for rt_sigaction in kernel/signal.c is as follows:
>>>
>>> #ifdef __ARCH_WANT_SYS_RT_SIGACTION
>>> SYSCALL_DEFINE4(rt_sigaction, int, sig,
>>> const struct sigaction __user *, act,
>>> struct sigaction __user *, oact,
>>> size_t, sigsetsize)
>>> {
>>> struct k_sigaction new_sa, old_sa;
>>> int ret = -EINVAL;
>>>
>>> /* XXX: Don't preclude handling different sized sigset_t's. */
>>> if (sigsetsize != sizeof(sigset_t))
>>> goto out;
>>>
>>> if (act) {
>>> if (copy_from_user(&new_sa.sa, act, sizeof(new_sa.sa)))
>>> return -EFAULT;
>>> }
>>>
>>> ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa :
>>> NULL);
>>>
>>> if (!ret && oact) {
>>> if (copy_to_user(oact, &old_sa.sa, sizeof(old_sa.sa)))
>>> return -EFAULT;
>>> }
>>> out:
>>> return ret;
>>> }
>>>
>>> This just blows my mind because rt_sigaction is just calling
>>> do_sigaction, which is the same code as sigaction AFAICT, apart from
>>> the fact that rt_sigaction completely disregards sa_restorer on some
>>> architectures because it's obsolete, and requires the end-user to
>>> specify a signal mask set (here's mips' version, which wasn't the same
>>> as i386's version -- i386 had the old sa_restorer code):
>>>
>>> SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
>>> struct sigaction __user *, oact)
>>> {
>>> struct k_sigaction new_ka, old_ka;
>>> int ret;
>>> int err = 0;
>>>
>>> if (act) {
>>> old_sigset_t mask;
>>>
>>> if (!access_ok(VERIFY_READ, act, sizeof(*act)))
>>> return -EFAULT;
>>> err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
>>> err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
>>> err |= __get_user(mask, &act->sa_mask.sig[0]);
>>> if (err)
>>> return -EFAULT;
>>>
>>> siginitset(&new_ka.sa.sa_mask, mask);
>>> }
>>>
>>> ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka :
>>> NULL);
>>>
>>> if (!ret && oact) {
>>> if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
>>> return -EFAULT;
>>> err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
>>> err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
>>> err |= __put_user(old_ka.sa.sa_mask.sig[0],
>>> oact->sa_mask.sig);
>>> err |= __put_user(0, &oact->sa_mask.sig[1]);
>>> err |= __put_user(0, &oact->sa_mask.sig[2]);
>>> err |= __put_user(0, &oact->sa_mask.sig[3]);
>>> if (err)
>>> return -EFAULT;
>>> }
>>>
>>> return ret;
>>> }
>>>
>>> I dunno -- maybe someone else can read the kernel code better than me,
>>> but it looks like there's zero real value to the rt_sigaction
>>> testcases, because it can be covered by sigaction...
>>>
>>>
>>>
>>> We just tell guys who use these testcases on arch x86_64 that
>>> "Syscall rt_sigaction cannot be called directly on arch x86_64.",
>>> can we?
>>>
>>>
>>> It's not just x86_64 -- it's also ia64, and this may change
>>> depending on the version of glibc and linux sources, so... this really
>>> isn't a viable solution IMO.
>>> Does anyone have any better suggestions, apart from just using a
>>> preprocessor macro that would execute rt_sig* via their non-rt
>>> equivalents in ltp_signal.h?
>>>
>>>
>>> AHA! I think I discovered the kernel bug. rt_sigaction on x86_64
>>> assumes that you're working in 32-bit space:
>>>
>>> gcoo...@orangebox /usr/src/linux $ grep -r rt_sigaction
>>> /usr/src/linux/arch/x86*
>>> /usr/src/linux/arch/x86/ia32/sys_ia32.c:asmlinkage long
>>> sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
>>> Binary file /usr/src/linux/arch/x86/ia32/sys_ia32.o matches
>>> Binary file /usr/src/linux/arch/x86/ia32/built-in.o matches
>>> /usr/src/linux/arch/x86/ia32/ia32entry.S: .quad sys32_rt_sigaction
>>> Binary file /usr/src/linux/arch/x86/ia32/ia32entry.o matches
>>> Binary file /usr/src/linux/arch/x86/kernel/syscall_64.o matches
>>> Binary file /usr/src/linux/arch/x86/kernel/built-in.o matches
>>> /usr/src/linux/arch/x86/kernel/syscall_table_32.S: .long
>>> sys_rt_sigaction
>>> /usr/src/linux/arch/x86/include/asm/unistd_32.h:#define
>>> __NR_rt_sigaction 174
>>> /usr/src/linux/arch/x86/include/asm/unistd_64.h:#define
>>> __NR_rt_sigaction 13
>>> /usr/src/linux/arch/x86/include/asm/unistd_64.h:__SYSCALL(__NR_rt_sigaction,
>>> sys_rt_sigaction)
>>> /usr/src/linux/arch/x86/include/asm/sys_ia32.h:asmlinkage long
>>> sys32_rt_sigaction(int, struct sigaction32 __user *,
>>>
>>> Watch (compiled with -m32):
>>>
>>> rt_sigaction01 0 TINFO : signal: 34
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>>> rt_sigaction01 0 TINFO : signal: 35
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>>> rt_sigaction01 0 TINFO : signal: 36
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>>> rt_sigaction01 0 TINFO : signal: 37
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>>> rt_sigaction01 0 TINFO : signal: 38
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>>> rt_sigaction01 0 TINFO : signal: 39
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>>> rt_sigaction01 0 TINFO : signal: 40
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>>> rt_sigaction01 0 TINFO : signal: 41
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>>> rt_sigaction01 0 TINFO : signal: 42
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>>> rt_sigaction01 0 TINFO : signal: 43
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>>> rt_sigaction01 0 TINFO : signal: 44
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>>> rt_sigaction01 0 TINFO : signal: 45
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>>> rt_sigaction01 0 TINFO : signal: 46
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>>> rt_sigaction01 0 TINFO : signal: 47
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>>> rt_sigaction01 0 TINFO : signal: 48
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>>> rt_sigaction01 0 TINFO : signal: 49
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>>> rt_sigaction01 0 TINFO : signal: 50
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>>> rt_sigaction01 0 TINFO : signal: 51
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>>> rt_sigaction01 0 TINFO : signal: 52
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>>> rt_sigaction01 0 TINFO : signal: 53
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>>> rt_sigaction01 0 TINFO : signal: 54
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>>> rt_sigaction01 0 TINFO : signal: 55
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>>> rt_sigaction01 0 TINFO : signal: 56
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>>> rt_sigaction01 0 TINFO : signal: 57
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>>> rt_sigaction01 0 TINFO : signal: 58
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>>> rt_sigaction01 0 TINFO : signal: 59
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>>> rt_sigaction01 0 TINFO : signal: 60
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>>> rt_sigaction01 0 TINFO : signal: 61
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>>> rt_sigaction01 0 TINFO : signal: 62
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>>> rt_sigaction01 0 TINFO : signal: 63
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>>> rt_sigaction01 0 TINFO : signal: 64
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>>>
>>> So from what I can tell, the sucker isn't properly translating
>>> something in 64-bit space, and instead of properly trapping the issue,
>>> it's segfaulting and dying -_-.
>>>
>>> Ultimately the problem from what I can see is that bi-arch (32-bit on
>>> 64-bit kernel) 64-bit rt_sig* support is broken. I don't know about
>>> straight, non-bi-arch 64-bit rt_sig* support...
>>>
>>> If someone could verify this with a little more kernel experience, or
>>> someone could direct me on how the issue could be trapped in gdb so I
>>> could inspect the registers and ensure the traps are or aren't being
>>> done properly, that would be helpful.
>>>
>>>
>>>
>>> Although I had figured this, I think your solution is just a compromise,
>>> isn't it?
>>> Change 64-bit rt_sigaction to 32-bit rt_sigaction to pass the testcase.
>>> Let's try to use 64bit rt_sigaction to pass it. ^_^
>>>
>>
>> Luibo,
>> It isn't really a compromise -- it's an observation of what I
>> consider broken functionality in the 32-bit <-> 64-bit translation
>> layers in the kernel ;)... 32-bit and 64-bit rt_sigaction should
>> function equivalently, but they don't today.
>> Thanks,
>> -Garrett
>>
>>
>
> There is other issue in x86_64. see the following kernel source
> code from file arch/x86/kernel/signal.c:
>
> 412 #else /* !CONFIG_X86_32 */
> 413 static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t
> *info,
> 414 sigset_t *set, struct pt_regs *regs)
> 415 {
> ......
> 430
> 431 put_user_try {
> 432 /* Create the ucontext. */
> 433 if (cpu_has_xsave)
> 434 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
> 435 else
> 436 put_user_ex(0, &frame->uc.uc_flags);
> 437 put_user_ex(0, &frame->uc.uc_link);
> 438 put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
> 439 put_user_ex(sas_ss_flags(regs->sp),
> 440 &frame->uc.uc_stack.ss_flags);
> 441 put_user_ex(me->sas_ss_size,
> &frame->uc.uc_stack.ss_size);
> 442 err |= setup_sigcontext(&frame->uc.uc_mcontext, fp,
> regs, set->sig[0]);
> 443 err |= __copy_to_user(&frame->uc.uc_sigmask, set,
> sizeof(*set));
> 444
> 445 /* Set up to return from userspace. If provided, use a
> stub
> 446 already in userspace. */
> 447 /* x86-64 should always use SA_RESTORER. */
> 448 if (ka->sa.sa_flags & SA_RESTORER) {
> 449 put_user_ex(ka->sa.sa_restorer,
> &frame->pretcode);
> 450 } else {
> 451 /* could use a vstub here */
> 452 err |= -EFAULT;
> 453 }
> 454 } put_user_catch(err);
> 455
> ......
> 476 return 0;
> 477 }
> 478 #endif /* CONFIG_X86_32 */
>
>
> Line 448~453 said that x86-64 should always use SA_RESTORER flag ans set the
> sa_restorer, otherwise kernel will return EFAULT.
>
> In test rt_sigaction01.c, it used rt_sigaction syscall directly without the
> SA_RESTORER flag and null sa_restorer handler, so the test cases for x86_64
> will aways fail. In Liu's fix, he used sigaction() instead of rt_sigaction
> syscall. sigaction() will fill the SA_RESTORER flag and sa_restorer handler,
> so he can pass the test case in x86_64.
>
> Fill the SA_RESTORER flag and sa_restorer handler is the point I think.
Yes. I [mostly] fixed the rt_sigaction01 test a few hours ago. A
summary of the issues with the old version:
1. The test as it was written before verified functionality by
ensuring that coredumps and crashes didn't occur. The new version
either catches the appropriate rt signal and increments, or catches
SIGSEGV and continues. Eventually once all of the issues are worked
out with SIGRTMIN, the known issue TINFO printout needs to be removed
from include/ltp_signal.h
2. If the sa_flags field of a struct sigaction `object' specifies
SA_SIGINFO, you should and must use sa_sigaction instead of
sa_handler, as stated in the manpage, because sa_handler and
sa_sigaction are a union structure on many architectures, or not
present when rt_* not implemented.
3. An autoconf test was added to look for sa_sigaction in struct
sigaction, as it isn't present on all architectures.
So, while this does fix rt_sigaction01, by and large, the following
issues still exist with the rt_sig* syscalls:
1. SIGRTMIN always SIGSEGV's because signal_fault is being called in
arch/x86/kernel/signal.c . I need to put some printk's in the code to
understand why -EFAULT is being thrown, and thus why signal_fault is
being tossed.
2. rt_sigprocmask01 and rt_sigsuspend01 still segfault for the same
reason, as noted in 1.
Someone in the kernel.org team should generate some kind of
documentation to clarify several points (including architectural
quirks) with the rt_sig* syscalls. This trial and error problem
solving isn't very helpful and there are a fair number of gotchas
involved with implementing a functional set of sigaction-like calls
using rt_sig*.
Thanks,
-Garrett
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