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The recent commit b4a5d26d88
"linux: Consolidate sigaction implementation" changed the definition
of struct sigaction for s390 (31bit). Unfortunately the order of the
fields were wrong.
This leads to blocking testcases e.g. nptl/tst-sem11.
A thread which blocks due to sem_wait() is cancelled via pthread_cancel()
and the signal-handler sigcancel_handler (see <glibc-src>/nptl/nptl-init.c
is called.
But it just returns as the siginfo_t argument is not setup by the kernel.
Then the main-thread is blocking due to pthread_join().
The flag SA_SIGINFO is set in sa_flags in struct sigaction and
is copied to the "kernel_sigaction.h" struct by the sigaction() call,
but due to the wrong ordering of the struct fields,
the kernel does not recognize it.
33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
#include <bits/types/siginfo_t.h>
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#define SA_RESTORER 0x04000000
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/* This is the sigaction structure from the Linux 3.2 kernel. */
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struct kernel_sigaction
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{
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union
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{
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__sighandler_t _sa_handler;
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void (*_sa_sigaction)(int, siginfo_t *, void *);
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} _u;
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#define k_sa_handler _u._sa_handler
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/* The 'struct sigaction' definition in s390 kernel header
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arch/s390/include/uapi/asm/signal.h is used for __NR_rt_sigaction
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on 64 bits and for __NR_sigaction for 31 bits.
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The expected layout for __NR_rt_sigaction for 31 bits is either
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'struct sigaction' from include/linux/signal_types.h or
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'struct compat_sigaction' from include/linux/compat.h.
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So for __NR_rt_sigaction we can use the same layout for both s390x
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and s390. */
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unsigned long sa_flags;
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void (*sa_restorer)(void);
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sigset_t sa_mask;
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};
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#define SET_SA_RESTORER(kact, act) \
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(kact)->sa_restorer = (act)->sa_restorer
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#define RESET_SA_RESTORER(act, kact) \
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(act)->sa_restorer = (kact)->sa_restorer
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