23eeeff7be
handling clean and functional as 5.x evolves. This allows some of the nasty bandaids in the 5.x codepaths to be unwound. Encapsulate 4.x signal handling under COMPAT_FREEBSD4 (there is an anti-foot-shooting measure in place, 5.x folks need this for a while) and finish encapsulating the older stuff under COMPAT_43. Since the ancient stuff is required on alpha (longjmp(3) passes a 'struct osigcontext *' to the current sigreturn(2), instead of the 'ucontext_t *' that sigreturn is supposed to take), add a compile time check to prevent foot shooting there too. Add uniform COMPAT_43 stubs for ia64/sparc64/powerpc. Tested on: i386, alpha, ia64. Compiled on sparc64 (a few days ago). Approved by: re
354 lines
11 KiB
C
354 lines
11 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)signal.h 8.4 (Berkeley) 5/4/95
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* $FreeBSD$
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*/
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#ifndef _SYS_SIGNAL_H_
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#define _SYS_SIGNAL_H_
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#include <sys/cdefs.h>
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#include <sys/_sigset.h>
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#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
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/*
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* System defined signals.
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*/
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#define SIGHUP 1 /* hangup */
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#endif
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#define SIGINT 2 /* interrupt */
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#define SIGQUIT 3 /* quit */
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#endif
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#define SIGILL 4 /* illegal instr. (not reset when caught) */
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#if __XSI_VISIBLE
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#define SIGTRAP 5 /* trace trap (not reset when caught) */
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#endif
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#define SIGABRT 6 /* abort() */
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#if __BSD_VISIBLE
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#define SIGIOT SIGABRT /* compatibility */
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#define SIGEMT 7 /* EMT instruction */
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#endif
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#define SIGFPE 8 /* floating point exception */
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#define SIGKILL 9 /* kill (cannot be caught or ignored) */
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#endif
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#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
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#define SIGBUS 10 /* bus error */
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#endif
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#define SIGSEGV 11 /* segmentation violation */
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#if __BSD_VISIBLE
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#define SIGSYS 12 /* non-existent system call invoked */
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#endif
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#define SIGPIPE 13 /* write on a pipe with no one to read it */
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#define SIGALRM 14 /* alarm clock */
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#endif
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#define SIGTERM 15 /* software termination signal from kill */
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#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
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#define SIGURG 16 /* urgent condition on IO channel */
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#endif
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#define SIGSTOP 17 /* sendable stop signal not from tty */
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#define SIGTSTP 18 /* stop signal from tty */
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#define SIGCONT 19 /* continue a stopped process */
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#define SIGCHLD 20 /* to parent on child stop or exit */
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#define SIGTTIN 21 /* to readers pgrp upon background tty read */
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#define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
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#endif
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#if __BSD_VISIBLE
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#define SIGIO 23 /* input/output possible signal */
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#endif
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#if __XSI_VISIBLE
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#define SIGXCPU 24 /* exceeded CPU time limit */
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#define SIGXFSZ 25 /* exceeded file size limit */
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#define SIGVTALRM 26 /* virtual time alarm */
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#define SIGPROF 27 /* profiling time alarm */
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#endif
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#if __BSD_VISIBLE
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#define SIGWINCH 28 /* window size changes */
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#define SIGINFO 29 /* information request */
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#endif
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#define SIGUSR1 30 /* user defined signal 1 */
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#define SIGUSR2 31 /* user defined signal 2 */
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#endif
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/*
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* XXX missing SIGRTMIN, SIGRTMAX.
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*/
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#define SIG_DFL ((__sighandler_t *)0)
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#define SIG_IGN ((__sighandler_t *)1)
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#define SIG_ERR ((__sighandler_t *)-1)
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/*
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* XXX missing SIG_HOLD.
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*/
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/*-
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* Type of a signal handling function.
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*
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* Language spec sez signal handlers take exactly one arg, even though we
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* actually supply three. Ugh!
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*
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* We don't try to hide the difference by leaving out the args because
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* that would cause warnings about conformant programs. Nonconformant
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* programs can avoid the warnings by casting to (__sighandler_t *) or
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* sig_t before calling signal() or assigning to sa_handler or sv_handler.
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*
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* The kernel should reverse the cast before calling the function. It
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* has no way to do this, but on most machines 1-arg and 3-arg functions
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* have the same calling protocol so there is no problem in practice.
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* A bit in sa_flags could be used to specify the number of args.
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*/
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typedef void __sighandler_t(int);
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#ifndef _SIGSET_T_DECLARED
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#define _SIGSET_T_DECLARED
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typedef __sigset_t sigset_t;
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#endif
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#endif
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#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
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union sigval {
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/* Members as suggested by Annex C of POSIX 1003.1b. */
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int sigval_int;
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void *sigval_ptr;
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};
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#endif
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#if __POSIX_VISIBLE >= 199309
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struct sigevent {
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int sigev_notify; /* Notification type */
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union {
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int __sigev_signo; /* Signal number */
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int __sigev_notify_kqueue;
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} __sigev_u;
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union sigval sigev_value; /* Signal value */
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/*
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* XXX missing sigev_notify_function, sigev_notify_attributes.
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*/
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};
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#define sigev_signo __sigev_u.__sigev_signo
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#if __BSD_VISIBLE
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#define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue
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#endif
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#define SIGEV_NONE 0 /* No async notification */
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#define SIGEV_SIGNAL 1 /* Generate a queued signal */
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#if __BSD_VISIBLE
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#define SIGEV_KEVENT 3 /* Generate a kevent */
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#endif
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/*
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* XXX missing SIGEV_THREAD.
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*/
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#endif /* __POSIX_VISIBLE >= 199309 */
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#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
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typedef struct __siginfo {
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int si_signo; /* signal number */
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int si_errno; /* errno association */
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/*
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* Cause of signal, one of the SI_ macros or signal-specific
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* values, i.e. one of the FPE_... values for SIGFPE. This
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* value is equivalent to the second argument to an old-style
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* FreeBSD signal handler.
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*/
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int si_code; /* signal code */
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__pid_t si_pid; /* sending process */
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__uid_t si_uid; /* sender's ruid */
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int si_status; /* exit value */
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void *si_addr; /* faulting instruction */
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union sigval si_value; /* signal value */
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long si_band; /* band event for SIGPOLL */
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int __spare__[7]; /* gimme some slack */
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} siginfo_t;
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#endif
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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struct __siginfo;
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/*
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* Signal vector "template" used in sigaction call.
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*/
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struct sigaction {
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union {
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void (*__sa_handler)(int);
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void (*__sa_sigaction)(int, struct __siginfo *, void *);
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} __sigaction_u; /* signal handler */
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int sa_flags; /* see signal options below */
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sigset_t sa_mask; /* signal mask to apply */
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};
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#endif
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#if __XSI_VISIBLE
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/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
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#define sa_handler __sigaction_u.__sa_handler
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#define sa_sigaction __sigaction_u.__sa_sigaction
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#endif
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
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#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
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#if __XSI_VISIBLE
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#define SA_ONSTACK 0x0001 /* take signal on signal stack */
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#define SA_RESTART 0x0002 /* restart system call on signal return */
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#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
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#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
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#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
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#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
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#endif
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#if __BSD_VISIBLE
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/* XXX dubious. */
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#ifdef COMPAT_SUNOS
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#define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */
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#endif
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#endif
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#if __BSD_VISIBLE
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#define NSIG 32 /* number of old signals (counting 0) */
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#endif
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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#define SI_USER 0x10001
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#define SI_QUEUE 0x10002
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#define SI_TIMER 0x10003
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#define SI_ASYNCIO 0x10004
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#define SI_MESGQ 0x10005
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#endif
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#if __BSD_VISIBLE
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#define SI_UNDEFINED 0
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#endif
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#if __BSD_VISIBLE
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typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
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typedef void __siginfohandler_t(int, struct __siginfo *, void *);
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#endif
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#if __XSI_VISIBLE
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/*
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* Structure used in sigaltstack call.
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*/
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#if __BSD_VISIBLE
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typedef struct sigaltstack {
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#else
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typedef struct {
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#endif
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char *ss_sp; /* signal stack base */
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__size_t ss_size; /* signal stack length */
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int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
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} stack_t;
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#define SS_ONSTACK 0x0001 /* take signal on alternate stack */
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#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
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#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
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#endif
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#if __BSD_VISIBLE
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/*
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* 4.3 compatibility:
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* Signal vector "template" used in sigvec call.
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*/
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struct sigvec {
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__sighandler_t *sv_handler; /* signal handler */
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int sv_mask; /* signal mask to apply */
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int sv_flags; /* see signal options below */
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};
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#define SV_ONSTACK SA_ONSTACK
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#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
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#define SV_RESETHAND SA_RESETHAND
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#define SV_NODEFER SA_NODEFER
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#define SV_NOCLDSTOP SA_NOCLDSTOP
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#define SV_SIGINFO SA_SIGINFO
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#define sv_onstack sv_flags /* isn't compatibility wonderful! */
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#endif
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/* Keep this in one place only */
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#if defined(_KERNEL) && defined(COMPAT_43) && \
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!defined(__i386__) && !defined(__alpha__)
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struct osigcontext {
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int _not_used;
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};
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#endif
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#if __XSI_VISIBLE
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/*
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* Structure used in sigstack call.
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*/
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struct sigstack {
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/* XXX ss_sp's type should be `void *'. */
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char *ss_sp; /* signal stack pointer */
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int ss_onstack; /* current status */
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};
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#endif
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#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
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/*
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* Macro for converting signal number to a mask suitable for
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* sigblock().
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*/
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#define sigmask(m) (1 << ((m)-1))
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#endif
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#if __BSD_VISIBLE
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#define BADSIG SIG_ERR
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#endif
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#if __POSIX_VISIBLE || __XSI_VISIBLE
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/*
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* Flags for sigprocmask:
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*/
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#define SIG_BLOCK 1 /* block specified signal set */
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#define SIG_UNBLOCK 2 /* unblock specified signal set */
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#define SIG_SETMASK 3 /* set specified signal set */
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#endif
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/*
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* For historical reasons; programs expect signal's return value to be
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* defined by <sys/signal.h>.
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*/
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__BEGIN_DECLS
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__sighandler_t *signal(int, __sighandler_t *);
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__END_DECLS
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#endif /* !_SYS_SIGNAL_H_ */
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