X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=include%2Flinux%2Fsignal.h;h=3fa0fab4a04bfc3b5ce155a1b92146cde54d962d;hb=55c0d1f83e481dd6c77f52f7dcfeb043b8b740fa;hp=1e4ce7225eeef979c26cfc8a8cde48eba797dad2;hpb=be883da7594b0a2a02074e683673ae0e522566a4;p=powerpc.git diff --git a/include/linux/signal.h b/include/linux/signal.h index 1e4ce7225e..3fa0fab4a0 100644 --- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -8,32 +8,6 @@ #include #include -/* - * These values of sa_flags are used only by the kernel as part of the - * irq handling routines. - * - * SA_INTERRUPT is also used by the irq handling routines. - * SA_SHIRQ is for shared interrupt support on PCI and EISA. - * SA_PROBEIRQ is set by callers when they expect sharing mismatches to occur - */ -#define SA_SAMPLE_RANDOM SA_RESTART -#define SA_SHIRQ 0x04000000 -#define SA_PROBEIRQ 0x08000000 - -/* - * As above, these correspond to the IORESOURCE_IRQ_* defines in - * linux/ioport.h to select the interrupt line behaviour. When - * requesting an interrupt without specifying a SA_TRIGGER, the - * setting should be assumed to be "as already configured", which - * may be as per machine or firmware initialisation. - */ -#define SA_TRIGGER_LOW 0x00000008 -#define SA_TRIGGER_HIGH 0x00000004 -#define SA_TRIGGER_FALLING 0x00000002 -#define SA_TRIGGER_RISING 0x00000001 -#define SA_TRIGGER_MASK (SA_TRIGGER_HIGH|SA_TRIGGER_LOW|\ - SA_TRIGGER_RISING|SA_TRIGGER_FALLING) - /* * Real Time signals may be queued. */ @@ -267,6 +241,133 @@ extern int sigprocmask(int, sigset_t *, sigset_t *); struct pt_regs; extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie); +extern struct kmem_cache *sighand_cachep; + +/* + * In POSIX a signal is sent either to a specific thread (Linux task) + * or to the process as a whole (Linux thread group). How the signal + * is sent determines whether it's to one thread or the whole group, + * which determines which signal mask(s) are involved in blocking it + * from being delivered until later. When the signal is delivered, + * either it's caught or ignored by a user handler or it has a default + * effect that applies to the whole thread group (POSIX process). + * + * The possible effects an unblocked signal set to SIG_DFL can have are: + * ignore - Nothing Happens + * terminate - kill the process, i.e. all threads in the group, + * similar to exit_group. The group leader (only) reports + * WIFSIGNALED status to its parent. + * coredump - write a core dump file describing all threads using + * the same mm and then kill all those threads + * stop - stop all the threads in the group, i.e. TASK_STOPPED state + * + * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. + * Other signals when not blocked and set to SIG_DFL behaves as follows. + * The job control signals also have other special effects. + * + * +--------------------+------------------+ + * | POSIX signal | default action | + * +--------------------+------------------+ + * | SIGHUP | terminate | + * | SIGINT | terminate | + * | SIGQUIT | coredump | + * | SIGILL | coredump | + * | SIGTRAP | coredump | + * | SIGABRT/SIGIOT | coredump | + * | SIGBUS | coredump | + * | SIGFPE | coredump | + * | SIGKILL | terminate(+) | + * | SIGUSR1 | terminate | + * | SIGSEGV | coredump | + * | SIGUSR2 | terminate | + * | SIGPIPE | terminate | + * | SIGALRM | terminate | + * | SIGTERM | terminate | + * | SIGCHLD | ignore | + * | SIGCONT | ignore(*) | + * | SIGSTOP | stop(*)(+) | + * | SIGTSTP | stop(*) | + * | SIGTTIN | stop(*) | + * | SIGTTOU | stop(*) | + * | SIGURG | ignore | + * | SIGXCPU | coredump | + * | SIGXFSZ | coredump | + * | SIGVTALRM | terminate | + * | SIGPROF | terminate | + * | SIGPOLL/SIGIO | terminate | + * | SIGSYS/SIGUNUSED | coredump | + * | SIGSTKFLT | terminate | + * | SIGWINCH | ignore | + * | SIGPWR | terminate | + * | SIGRTMIN-SIGRTMAX | terminate | + * +--------------------+------------------+ + * | non-POSIX signal | default action | + * +--------------------+------------------+ + * | SIGEMT | coredump | + * +--------------------+------------------+ + * + * (+) For SIGKILL and SIGSTOP the action is "always", not just "default". + * (*) Special job control effects: + * When SIGCONT is sent, it resumes the process (all threads in the group) + * from TASK_STOPPED state and also clears any pending/queued stop signals + * (any of those marked with "stop(*)"). This happens regardless of blocking, + * catching, or ignoring SIGCONT. When any stop signal is sent, it clears + * any pending/queued SIGCONT signals; this happens regardless of blocking, + * catching, or ignored the stop signal, though (except for SIGSTOP) the + * default action of stopping the process may happen later or never. + */ + +#ifdef SIGEMT +#define SIGEMT_MASK rt_sigmask(SIGEMT) +#else +#define SIGEMT_MASK 0 +#endif + +#if SIGRTMIN > BITS_PER_LONG +#define rt_sigmask(sig) (1ULL << ((sig)-1)) +#else +#define rt_sigmask(sig) sigmask(sig) +#endif +#define siginmask(sig, mask) (rt_sigmask(sig) & (mask)) + +#define SIG_KERNEL_ONLY_MASK (\ + rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP)) + +#define SIG_KERNEL_STOP_MASK (\ + rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \ + rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) ) + +#define SIG_KERNEL_COREDUMP_MASK (\ + rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \ + rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \ + rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \ + rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \ + rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \ + SIGEMT_MASK ) + +#define SIG_KERNEL_IGNORE_MASK (\ + rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \ + rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) ) + +#define sig_kernel_only(sig) \ + (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK)) +#define sig_kernel_coredump(sig) \ + (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK)) +#define sig_kernel_ignore(sig) \ + (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK)) +#define sig_kernel_stop(sig) \ + (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK)) + +#define sig_needs_tasklist(sig) ((sig) == SIGCONT) + +#define sig_user_defined(t, signr) \ + (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \ + ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN)) + +#define sig_fatal(t, signr) \ + (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \ + (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL) + #endif /* __KERNEL__ */ #endif /* _LINUX_SIGNAL_H */