Move sig_kernel_* et al macros to linux/signal.h
This patch moves the sig_kernel_* and related macros from kernel/signal.c to linux/signal.h, and cleans them up slightly. I need the sig_kernel_* macros for default signal behavior in the utrace code, and want to avoid duplication or overhead to share the knowledge. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roland McGrath
Linus Torvalds
parent
84963048ca
commit
55c0d1f83e
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@ -243,6 +243,131 @@ extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
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extern struct kmem_cache *sighand_cachep;
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/*
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* In POSIX a signal is sent either to a specific thread (Linux task)
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* or to the process as a whole (Linux thread group). How the signal
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* is sent determines whether it's to one thread or the whole group,
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* which determines which signal mask(s) are involved in blocking it
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* from being delivered until later. When the signal is delivered,
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* either it's caught or ignored by a user handler or it has a default
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* effect that applies to the whole thread group (POSIX process).
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*
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* The possible effects an unblocked signal set to SIG_DFL can have are:
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* ignore - Nothing Happens
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* terminate - kill the process, i.e. all threads in the group,
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* similar to exit_group. The group leader (only) reports
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* WIFSIGNALED status to its parent.
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* coredump - write a core dump file describing all threads using
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* the same mm and then kill all those threads
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* stop - stop all the threads in the group, i.e. TASK_STOPPED state
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*
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* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
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* Other signals when not blocked and set to SIG_DFL behaves as follows.
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* The job control signals also have other special effects.
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*
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* +--------------------+------------------+
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* | POSIX signal | default action |
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* +--------------------+------------------+
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* | SIGHUP | terminate |
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* | SIGINT | terminate |
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* | SIGQUIT | coredump |
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* | SIGILL | coredump |
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* | SIGTRAP | coredump |
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* | SIGABRT/SIGIOT | coredump |
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* | SIGBUS | coredump |
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* | SIGFPE | coredump |
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* | SIGKILL | terminate(+) |
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* | SIGUSR1 | terminate |
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* | SIGSEGV | coredump |
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* | SIGUSR2 | terminate |
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* | SIGPIPE | terminate |
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* | SIGALRM | terminate |
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* | SIGTERM | terminate |
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* | SIGCHLD | ignore |
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* | SIGCONT | ignore(*) |
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* | SIGSTOP | stop(*)(+) |
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* | SIGTSTP | stop(*) |
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* | SIGTTIN | stop(*) |
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* | SIGTTOU | stop(*) |
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* | SIGURG | ignore |
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* | SIGXCPU | coredump |
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* | SIGXFSZ | coredump |
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* | SIGVTALRM | terminate |
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* | SIGPROF | terminate |
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* | SIGPOLL/SIGIO | terminate |
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* | SIGSYS/SIGUNUSED | coredump |
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* | SIGSTKFLT | terminate |
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* | SIGWINCH | ignore |
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* | SIGPWR | terminate |
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* | SIGRTMIN-SIGRTMAX | terminate |
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* +--------------------+------------------+
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* | non-POSIX signal | default action |
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* +--------------------+------------------+
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* | SIGEMT | coredump |
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* +--------------------+------------------+
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*
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* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
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* (*) Special job control effects:
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* When SIGCONT is sent, it resumes the process (all threads in the group)
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* from TASK_STOPPED state and also clears any pending/queued stop signals
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* (any of those marked with "stop(*)"). This happens regardless of blocking,
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* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
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* any pending/queued SIGCONT signals; this happens regardless of blocking,
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* catching, or ignored the stop signal, though (except for SIGSTOP) the
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* default action of stopping the process may happen later or never.
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*/
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#ifdef SIGEMT
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#define SIGEMT_MASK rt_sigmask(SIGEMT)
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#else
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#define SIGEMT_MASK 0
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#endif
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#if SIGRTMIN > BITS_PER_LONG
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#define rt_sigmask(sig) (1ULL << ((sig)-1))
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#else
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#define rt_sigmask(sig) sigmask(sig)
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#endif
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#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
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#define SIG_KERNEL_ONLY_MASK (\
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rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
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#define SIG_KERNEL_STOP_MASK (\
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rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
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rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
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#define SIG_KERNEL_COREDUMP_MASK (\
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rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
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rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
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rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
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rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
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rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
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SIGEMT_MASK )
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#define SIG_KERNEL_IGNORE_MASK (\
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rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
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rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
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#define sig_kernel_only(sig) \
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(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
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#define sig_kernel_coredump(sig) \
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(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
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#define sig_kernel_ignore(sig) \
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(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
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#define sig_kernel_stop(sig) \
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(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
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#define sig_needs_tasklist(sig) ((sig) == SIGCONT)
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#define sig_user_defined(t, signr) \
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(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
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((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
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#define sig_fatal(t, signr) \
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(!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
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(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SIGNAL_H */
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119
kernel/signal.c
119
kernel/signal.c
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@ -38,125 +38,6 @@
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static struct kmem_cache *sigqueue_cachep;
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/*
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* In POSIX a signal is sent either to a specific thread (Linux task)
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* or to the process as a whole (Linux thread group). How the signal
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* is sent determines whether it's to one thread or the whole group,
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* which determines which signal mask(s) are involved in blocking it
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* from being delivered until later. When the signal is delivered,
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* either it's caught or ignored by a user handler or it has a default
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* effect that applies to the whole thread group (POSIX process).
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*
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* The possible effects an unblocked signal set to SIG_DFL can have are:
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* ignore - Nothing Happens
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* terminate - kill the process, i.e. all threads in the group,
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* similar to exit_group. The group leader (only) reports
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* WIFSIGNALED status to its parent.
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* coredump - write a core dump file describing all threads using
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* the same mm and then kill all those threads
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* stop - stop all the threads in the group, i.e. TASK_STOPPED state
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*
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* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
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* Other signals when not blocked and set to SIG_DFL behaves as follows.
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* The job control signals also have other special effects.
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*
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* +--------------------+------------------+
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* | POSIX signal | default action |
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* +--------------------+------------------+
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* | SIGHUP | terminate |
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* | SIGINT | terminate |
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* | SIGQUIT | coredump |
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* | SIGILL | coredump |
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* | SIGTRAP | coredump |
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* | SIGABRT/SIGIOT | coredump |
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* | SIGBUS | coredump |
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* | SIGFPE | coredump |
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* | SIGKILL | terminate(+) |
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* | SIGUSR1 | terminate |
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* | SIGSEGV | coredump |
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* | SIGUSR2 | terminate |
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* | SIGPIPE | terminate |
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* | SIGALRM | terminate |
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* | SIGTERM | terminate |
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* | SIGCHLD | ignore |
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* | SIGCONT | ignore(*) |
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* | SIGSTOP | stop(*)(+) |
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* | SIGTSTP | stop(*) |
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* | SIGTTIN | stop(*) |
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* | SIGTTOU | stop(*) |
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* | SIGURG | ignore |
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* | SIGXCPU | coredump |
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* | SIGXFSZ | coredump |
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* | SIGVTALRM | terminate |
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* | SIGPROF | terminate |
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* | SIGPOLL/SIGIO | terminate |
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* | SIGSYS/SIGUNUSED | coredump |
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* | SIGSTKFLT | terminate |
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* | SIGWINCH | ignore |
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* | SIGPWR | terminate |
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* | SIGRTMIN-SIGRTMAX | terminate |
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* +--------------------+------------------+
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* | non-POSIX signal | default action |
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* +--------------------+------------------+
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* | SIGEMT | coredump |
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* +--------------------+------------------+
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*
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* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
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* (*) Special job control effects:
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* When SIGCONT is sent, it resumes the process (all threads in the group)
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* from TASK_STOPPED state and also clears any pending/queued stop signals
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* (any of those marked with "stop(*)"). This happens regardless of blocking,
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* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
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* any pending/queued SIGCONT signals; this happens regardless of blocking,
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* catching, or ignored the stop signal, though (except for SIGSTOP) the
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* default action of stopping the process may happen later or never.
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*/
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#ifdef SIGEMT
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#define M_SIGEMT M(SIGEMT)
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#else
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#define M_SIGEMT 0
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#endif
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#if SIGRTMIN > BITS_PER_LONG
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#define M(sig) (1ULL << ((sig)-1))
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#else
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#define M(sig) (1UL << ((sig)-1))
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#endif
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#define T(sig, mask) (M(sig) & (mask))
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#define SIG_KERNEL_ONLY_MASK (\
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M(SIGKILL) | M(SIGSTOP) )
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#define SIG_KERNEL_STOP_MASK (\
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M(SIGSTOP) | M(SIGTSTP) | M(SIGTTIN) | M(SIGTTOU) )
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#define SIG_KERNEL_COREDUMP_MASK (\
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M(SIGQUIT) | M(SIGILL) | M(SIGTRAP) | M(SIGABRT) | \
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M(SIGFPE) | M(SIGSEGV) | M(SIGBUS) | M(SIGSYS) | \
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M(SIGXCPU) | M(SIGXFSZ) | M_SIGEMT )
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#define SIG_KERNEL_IGNORE_MASK (\
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M(SIGCONT) | M(SIGCHLD) | M(SIGWINCH) | M(SIGURG) )
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#define sig_kernel_only(sig) \
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(((sig) < SIGRTMIN) && T(sig, SIG_KERNEL_ONLY_MASK))
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#define sig_kernel_coredump(sig) \
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(((sig) < SIGRTMIN) && T(sig, SIG_KERNEL_COREDUMP_MASK))
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#define sig_kernel_ignore(sig) \
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(((sig) < SIGRTMIN) && T(sig, SIG_KERNEL_IGNORE_MASK))
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#define sig_kernel_stop(sig) \
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(((sig) < SIGRTMIN) && T(sig, SIG_KERNEL_STOP_MASK))
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#define sig_needs_tasklist(sig) ((sig) == SIGCONT)
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#define sig_user_defined(t, signr) \
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(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
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((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
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#define sig_fatal(t, signr) \
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(!T(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
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(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
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static int sig_ignored(struct task_struct *t, int sig)
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{
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