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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
145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/*-
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* Copyright (c) 1998 Mark Newton
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* Copyright (c) 1994 Christos Zoulas
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SVR4_SIGNAL_H_
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#define _SVR4_SIGNAL_H_
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#include <i386/svr4/svr4_machdep.h>
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#include <compat/svr4/svr4_siginfo.h>
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#define SVR4_SIGHUP 1
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#define SVR4_SIGINT 2
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#define SVR4_SIGQUIT 3
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#define SVR4_SIGILL 4
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#define SVR4_SIGTRAP 5
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#define SVR4_SIGIOT 6
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#define SVR4_SIGABRT 6
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#define SVR4_SIGEMT 7
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#define SVR4_SIGFPE 8
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#define SVR4_SIGKILL 9
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#define SVR4_SIGBUS 10
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#define SVR4_SIGSEGV 11
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#define SVR4_SIGSYS 12
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#define SVR4_SIGPIPE 13
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#define SVR4_SIGALRM 14
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#define SVR4_SIGTERM 15
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#define SVR4_SIGUSR1 16
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#define SVR4_SIGUSR2 17
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#define SVR4_SIGCLD 18
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#define SVR4_SIGCHLD 18
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#define SVR4_SIGPWR 19
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#define SVR4_SIGWINCH 20
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#define SVR4_SIGURG 21
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#define SVR4_SIGPOLL 22
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#define SVR4_SIGIO 22
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#define SVR4_SIGSTOP 23
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#define SVR4_SIGTSTP 24
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#define SVR4_SIGCONT 25
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#define SVR4_SIGTTIN 26
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#define SVR4_SIGTTOU 27
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#define SVR4_SIGVTALRM 28
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#define SVR4_SIGPROF 29
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#define SVR4_SIGXCPU 30
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#define SVR4_SIGXFSZ 31
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#define SVR4_NSIG 32
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#define SVR4_SIGNO_MASK 0x00FF
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#define SVR4_SIGNAL_MASK 0x0000
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#define SVR4_SIGDEFER_MASK 0x0100
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#define SVR4_SIGHOLD_MASK 0x0200
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#define SVR4_SIGRELSE_MASK 0x0400
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#define SVR4_SIGIGNORE_MASK 0x0800
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#define SVR4_SIGPAUSE_MASK 0x1000
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typedef void (*svr4_sig_t)(int, svr4_siginfo_t *, void *);
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#define SVR4_SIG_DFL (svr4_sig_t) 0
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#define SVR4_SIG_ERR (svr4_sig_t) -1
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#define SVR4_SIG_IGN (svr4_sig_t) 1
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#define SVR4_SIG_HOLD (svr4_sig_t) 2
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#define SVR4_SIGNO(a) ((a) & SVR4_SIGNO_MASK)
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#define SVR4_SIGCALL(a) ((a) & ~SVR4_SIGNO_MASK)
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#define SVR4_SIG_BLOCK 1
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#define SVR4_SIG_UNBLOCK 2
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#define SVR4_SIG_SETMASK 3
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extern int bsd_to_svr4_sig[SVR4_NSIG];
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extern int svr4_to_bsd_sig[SVR4_NSIG];
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#define SVR4_BSD2SVR4_SIG(sig) \
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(((sig) < SVR4_NSIG) ? bsd_to_svr4_sig[sig] : sig)
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#define SVR4_SVR42BSD_SIG(sig) \
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(((sig) < SVR4_NSIG) ? svr4_to_bsd_sig[sig] : sig)
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typedef struct {
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u_long bits[4];
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} svr4_sigset_t;
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struct svr4_sigaction {
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int ssa_flags;
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svr4_sig_t ssa_handler;
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svr4_sigset_t ssa_mask;
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int ssa_reserved[2];
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};
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struct svr4_sigaltstack {
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char *ss_sp;
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int ss_size;
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int ss_flags;
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};
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/* sa_flags */
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#define SVR4_SA_ONSTACK 0x00000001
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#define SVR4_SA_RESETHAND 0x00000002
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#define SVR4_SA_RESTART 0x00000004
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#define SVR4_SA_SIGINFO 0x00000008
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#define SVR4_SA_NODEFER 0x00000010
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#define SVR4_SA_NOCLDWAIT 0x00010000 /* No zombies */
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#define SVR4_SA_NOCLDSTOP 0x00020000 /* No jcl */
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#define SVR4_SA_ALLBITS 0x0003001f
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/* ss_flags */
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#define SVR4_SS_ONSTACK 0x00000001
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#define SVR4_SS_DISABLE 0x00000002
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#define SVR4_SS_ALLBITS 0x00000003
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#define SVR4_MINSIGSTKSZ 8192
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struct ksiginfo;
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void bsd_to_svr4_sigaltstack(const struct sigaltstack *, struct svr4_sigaltstack *);
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void bsd_to_svr4_sigset(const sigset_t *, svr4_sigset_t *);
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void svr4_to_bsd_sigaltstack(const struct svr4_sigaltstack *, struct sigaltstack *);
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void svr4_to_bsd_sigset(const svr4_sigset_t *, sigset_t *);
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void svr4_sendsig(sig_t, struct ksiginfo *, sigset_t *);
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#endif /* !_SVR4_SIGNAL_H_ */
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