9104847f21
changes in MD code are trivial, before this change, trapsignal and sendsig use discrete parameters, now they uses member fields of ksiginfo_t structure. For sendsig, this change allows us to pass POSIX realtime signal value to user code. 2. Remove cpu_thread_siginfo, it is no longer needed because we now always generate ksiginfo_t data and feed it to libpthread. 3. Add p_sigqueue to proc structure to hold shared signals which were blocked by all threads in the proc. 4. Add td_sigqueue to thread structure to hold all signals delivered to thread. 5. i386 and amd64 now return POSIX standard si_code, other arches will be fixed. 6. In this sigqueue implementation, pending signal set is kept as before, an extra siginfo list holds additional siginfo_t data for signals. kernel code uses psignal() still behavior as before, it won't be failed even under memory pressure, only exception is when deleting a signal, we should call sigqueue_delete to remove signal from sigqueue but not SIGDELSET. Current there is no kernel code will deliver a signal with additional data, so kernel should be as stable as before, a ksiginfo can carry more information, for example, allow signal to be delivered but throw away siginfo data if memory is not enough. SIGKILL and SIGSTOP have fast path in sigqueue_add, because they can not be caught or masked. The sigqueue() syscall allows user code to queue a signal to target process, if resource is unavailable, EAGAIN will be returned as specification said. Just before thread exits, signal queue memory will be freed by sigqueue_flush. Current, all signals are allowed to be queued, not only realtime signals. Earlier patch reviewed by: jhb, deischen Tested on: i386, amd64
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* $FreeBSD$ */
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#ifndef _OSF1_SIGNAL_H
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#define _OSF1_SIGNAL_H
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#define OSF1_NSIG 64
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#define OSF1_SIG_DFL 0
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#define OSF1_SIG_ERR -1
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#define OSF1_SIG_IGN 1
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#define OSF1_SIG_HOLD 2
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#define OSF1_SIGNO(a) ((a) & OSF1_SIGNO_MASK)
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#define OSF1_SIGCALL(a) ((a) & ~OSF1_SIGNO_MASK)
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#define OSF1_SIG_BLOCK 1
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#define OSF1_SIG_UNBLOCK 2
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#define OSF1_SIG_SETMASK 3
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typedef u_long osf1_sigset_t;
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typedef void (*osf1_handler_t)(int);
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struct osf1_sigaction {
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osf1_handler_t osa_handler;
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osf1_sigset_t osa_mask;
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int osa_flags;
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};
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struct osf1_sigaltstack {
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caddr_t ss_sp;
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int ss_flags;
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size_t ss_size;
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};
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/* sa_flags */
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#define OSF1_SA_ONSTACK 0x00000001
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#define OSF1_SA_RESTART 0x00000002
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#define OSF1_SA_NOCLDSTOP 0x00000004
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#define OSF1_SA_NODEFER 0x00000008
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#define OSF1_SA_RESETHAND 0x00000010
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#define OSF1_SA_NOCLDWAIT 0x00000020
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#define OSF1_SA_SIGINFO 0x00000040
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/* ss_flags */
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#define OSF1_SS_ONSTACK 0x00000001
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#define OSF1_SS_DISABLE 0x00000002
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#define OSF1_SIGNO_MASK 0x00FF
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#define OSF1_SIGNAL_MASK 0x0000
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#define OSF1_SIGDEFER_MASK 0x0100
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#define OSF1_SIGHOLD_MASK 0x0200
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#define OSF1_SIGRELSE_MASK 0x0400
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#define OSF1_SIGIGNORE_MASK 0x0800
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#define OSF1_SIGPAUSE_MASK 0x1000
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extern int osf1_to_linux_sig[];
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void bsd_to_osf1_sigaltstack(const struct sigaltstack *, struct osf1_sigaltstack *);
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void bsd_to_osf1_sigset(const sigset_t *, osf1_sigset_t *);
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void osf1_to_bsd_sigaltstack(const struct osf1_sigaltstack *, struct sigaltstack *);
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void osf1_to_bsd_sigset(const osf1_sigset_t *, sigset_t *);
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void osf1_sendsig(sig_t, struct ksiginfo *, sigset_t *);
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#endif /* !_OSF1_SIGNAL_H */
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