Also style, and remove unneeded cast. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D36207
426 lines
13 KiB
C
426 lines
13 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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. 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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* @(#)signalvar.h 8.6 (Berkeley) 2/19/95
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* $FreeBSD$
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*/
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#ifndef _SYS_SIGNALVAR_H_
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#define _SYS_SIGNALVAR_H_
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/signal.h>
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/*
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* Kernel signal definitions and data structures.
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*/
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/*
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* Logical process signal actions and state, needed only within the process
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* The mapping between sigacts and proc structures is 1:1 except for rfork()
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* processes masquerading as threads which use one structure for the whole
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* group. All members are locked by the included mutex. The reference count
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* and mutex must be last for the bcopy in sigacts_copy() to work.
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*/
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struct sigacts {
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sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */
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sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */
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sigset_t ps_sigonstack; /* Signals to take on sigstack. */
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sigset_t ps_sigintr; /* Signals that interrupt syscalls. */
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sigset_t ps_sigreset; /* Signals that reset when caught. */
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sigset_t ps_signodefer; /* Signals not masked while handled. */
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sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */
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sigset_t ps_sigignore; /* Signals being ignored. */
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sigset_t ps_sigcatch; /* Signals being caught by user. */
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sigset_t ps_freebsd4; /* Signals using freebsd4 ucontext. */
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sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */
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sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */
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int ps_flag;
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u_int ps_refcnt;
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struct mtx ps_mtx;
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};
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#define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
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#define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
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#define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */
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#ifdef _KERNEL
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#ifdef COMPAT_43
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typedef struct {
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struct osigcontext si_sc;
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int si_signo;
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int si_code;
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union sigval si_value;
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} osiginfo_t;
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struct osigaction {
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union {
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void (*__sa_handler)(int);
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void (*__sa_sigaction)(int, osiginfo_t *, void *);
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} __sigaction_u; /* signal handler */
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osigset_t sa_mask; /* signal mask to apply */
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int sa_flags; /* see signal options below */
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};
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typedef void __osiginfohandler_t(int, osiginfo_t *, void *);
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#endif /* COMPAT_43 */
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/* additional signal action values, used only temporarily/internally */
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#define SIG_CATCH ((__sighandler_t *)2)
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/* #define SIG_HOLD ((__sighandler_t *)3) See signal.h */
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/*
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* get signal action for process and signal; currently only for current process
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*/
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#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
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#endif /* _KERNEL */
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/*
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* sigset_t manipulation macros.
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*/
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#define SIGADDSET(set, signo) \
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((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo))
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#define SIGDELSET(set, signo) \
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((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo))
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#define SIGEMPTYSET(set) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set).__bits[__i] = 0; \
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} while (0)
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#define SIGFILLSET(set) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set).__bits[__i] = ~0U; \
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} while (0)
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#define SIGISMEMBER(set, signo) \
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((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
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#define SIGISEMPTY(set) (__sigisempty(&(set)))
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#define SIGNOTEMPTY(set) (!__sigisempty(&(set)))
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#define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2)))
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#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2)))
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#define SIGSETOR(set1, set2) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set1).__bits[__i] |= (set2).__bits[__i]; \
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} while (0)
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#define SIGSETAND(set1, set2) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set1).__bits[__i] &= (set2).__bits[__i]; \
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} while (0)
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#define SIGSETNAND(set1, set2) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set1).__bits[__i] &= ~(set2).__bits[__i]; \
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} while (0)
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#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0])
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#define SIGSETOLD(set, oset) ((set).__bits[0] = (oset))
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#define SIG_CANTMASK(set) \
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SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
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#define SIG_STOPSIGMASK(set) \
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SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \
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SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
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#define SIG_CONTSIGMASK(set) \
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SIGDELSET(set, SIGCONT)
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#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
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#define SIG2OSIG(sig, osig) (osig = (sig).__bits[0])
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#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig
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static __inline int
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__sigisempty(sigset_t *set)
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{
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int i;
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for (i = 0; i < _SIG_WORDS; i++) {
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if (set->__bits[i])
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return (0);
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}
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return (1);
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}
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static __inline int
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__sigseteq(sigset_t *set1, sigset_t *set2)
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{
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int i;
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for (i = 0; i < _SIG_WORDS; i++) {
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if (set1->__bits[i] != set2->__bits[i])
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return (0);
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}
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return (1);
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}
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#ifdef COMPAT_FREEBSD6
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struct osigevent {
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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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#endif
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typedef struct ksiginfo {
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TAILQ_ENTRY(ksiginfo) ksi_link;
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siginfo_t ksi_info;
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int ksi_flags;
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struct sigqueue *ksi_sigq;
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} ksiginfo_t;
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#define ksi_signo ksi_info.si_signo
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#define ksi_errno ksi_info.si_errno
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#define ksi_code ksi_info.si_code
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#define ksi_pid ksi_info.si_pid
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#define ksi_uid ksi_info.si_uid
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#define ksi_status ksi_info.si_status
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#define ksi_addr ksi_info.si_addr
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#define ksi_value ksi_info.si_value
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#define ksi_band ksi_info.si_band
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#define ksi_trapno ksi_info.si_trapno
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#define ksi_overrun ksi_info.si_overrun
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#define ksi_timerid ksi_info.si_timerid
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#define ksi_mqd ksi_info.si_mqd
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/* bits for ksi_flags */
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#define KSI_TRAP 0x01 /* Generated by trap. */
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#define KSI_EXT 0x02 /* Externally managed ksi. */
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#define KSI_INS 0x04 /* Directly insert ksi, not the copy */
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#define KSI_SIGQ 0x08 /* Generated by sigqueue, might ret EAGAIN. */
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#define KSI_HEAD 0x10 /* Insert into head, not tail. */
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#define KSI_PTRACE 0x20 /* Generated by ptrace. */
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#define KSI_COPYMASK (KSI_TRAP | KSI_SIGQ | KSI_PTRACE)
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#define KSI_ONQ(ksi) ((ksi)->ksi_sigq != NULL)
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typedef struct sigqueue {
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sigset_t sq_signals; /* All pending signals. */
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sigset_t sq_kill; /* Legacy depth 1 queue. */
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sigset_t sq_ptrace; /* Depth 1 queue for ptrace(2). */
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TAILQ_HEAD(, ksiginfo) sq_list;/* Queued signal info. */
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struct proc *sq_proc;
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int sq_flags;
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} sigqueue_t;
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/* Flags for ksi_flags */
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#define SQ_INIT 0x01
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/*
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* Fast_sigblock
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*/
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#define SIGFASTBLOCK_SETPTR 1
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#define SIGFASTBLOCK_UNBLOCK 2
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#define SIGFASTBLOCK_UNSETPTR 3
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#define SIGFASTBLOCK_PEND 0x1
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#define SIGFASTBLOCK_FLAGS 0xf
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#define SIGFASTBLOCK_INC 0x10
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#ifndef _KERNEL
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int __sys_sigfastblock(int cmd, void *ptr);
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#endif
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#ifdef _KERNEL
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extern bool sigfastblock_fetch_always;
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/* Return nonzero if process p has an unmasked pending signal. */
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#define SIGPENDING(td) \
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((!SIGISEMPTY((td)->td_siglist) && \
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!sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask)) || \
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(!SIGISEMPTY((td)->td_proc->p_siglist) && \
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!sigsetmasked(&(td)->td_proc->p_siglist, &(td)->td_sigmask)))
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/*
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* Return the value of the pseudo-expression ((*set & ~*mask) == 0). This
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* is an optimized version of SIGISEMPTY() on a temporary variable
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* containing SIGSETNAND(*set, *mask).
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*/
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static __inline bool
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sigsetmasked(sigset_t *set, sigset_t *mask)
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{
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int i;
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for (i = 0; i < _SIG_WORDS; i++) {
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if (set->__bits[i] & ~mask->__bits[i])
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return (false);
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}
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return (true);
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}
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#define ksiginfo_init(ksi) \
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do { \
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bzero(ksi, sizeof(ksiginfo_t)); \
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} while (0)
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#define ksiginfo_init_trap(ksi) \
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do { \
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ksiginfo_t *kp = ksi; \
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bzero(kp, sizeof(ksiginfo_t)); \
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kp->ksi_flags |= KSI_TRAP; \
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} while (0)
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static __inline void
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ksiginfo_copy(ksiginfo_t *src, ksiginfo_t *dst)
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{
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(dst)->ksi_info = src->ksi_info;
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(dst)->ksi_flags = (src->ksi_flags & KSI_COPYMASK);
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}
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static __inline void
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ksiginfo_set_sigev(ksiginfo_t *dst, struct sigevent *sigev)
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{
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dst->ksi_signo = sigev->sigev_signo;
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dst->ksi_value = sigev->sigev_value;
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}
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struct pgrp;
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struct proc;
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struct sigio;
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struct thread;
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/*
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* Lock the pointers for a sigio object in the underlying objects of
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* a file descriptor.
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*/
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#define SIGIO_LOCK() mtx_lock(&sigio_lock)
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#define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock)
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#define SIGIO_UNLOCK() mtx_unlock(&sigio_lock)
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#define SIGIO_LOCKED() mtx_owned(&sigio_lock)
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#define SIGIO_ASSERT_LOCKED() mtx_assert(&sigio_lock, MA_OWNED)
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extern struct mtx sigio_lock;
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/* Flags for kern_sigprocmask(). */
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#define SIGPROCMASK_OLD 0x0001
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#define SIGPROCMASK_PROC_LOCKED 0x0002
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#define SIGPROCMASK_PS_LOCKED 0x0004
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#define SIGPROCMASK_FASTBLK 0x0008
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/*
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* Modes for sigdeferstop(). Manages behaviour of
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* thread_suspend_check() in the region delimited by
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* sigdeferstop()/sigallowstop(). Must be restored to
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* SIGDEFERSTOP_OFF before returning to userspace.
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*/
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#define SIGDEFERSTOP_NOP 0 /* continue doing whatever is done now */
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#define SIGDEFERSTOP_OFF 1 /* stop ignoring STOPs */
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#define SIGDEFERSTOP_SILENT 2 /* silently ignore STOPs */
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#define SIGDEFERSTOP_EINTR 3 /* ignore STOPs, return EINTR */
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#define SIGDEFERSTOP_ERESTART 4 /* ignore STOPs, return ERESTART */
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#define SIGDEFERSTOP_VAL_NCHG (-1) /* placeholder indicating no state change */
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int sigdeferstop_impl(int mode);
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void sigallowstop_impl(int prev);
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static inline int
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sigdeferstop(int mode)
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{
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if (__predict_false(mode == SIGDEFERSTOP_NOP))
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return (SIGDEFERSTOP_VAL_NCHG);
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return (sigdeferstop_impl(mode));
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}
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static inline void
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sigallowstop(int prev)
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{
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if (__predict_true(prev == SIGDEFERSTOP_VAL_NCHG))
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return;
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sigallowstop_impl(prev);
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}
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int cursig(struct thread *td);
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void execsigs(struct proc *p);
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void gsignal(int pgid, int sig, ksiginfo_t *ksi);
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void killproc(struct proc *p, const char *why);
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ksiginfo_t *ksiginfo_alloc(int mwait);
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void ksiginfo_free(ksiginfo_t *ksi);
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int pksignal(struct proc *p, int sig, ksiginfo_t *ksi);
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void pgsigio(struct sigio **sigiop, int sig, int checkctty);
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void pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi);
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int postsig(int sig);
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void kern_psignal(struct proc *p, int sig);
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int ptracestop(struct thread *td, int sig, ksiginfo_t *si);
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void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *retmask);
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struct sigacts *sigacts_alloc(void);
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void sigacts_copy(struct sigacts *dest, struct sigacts *src);
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void sigacts_free(struct sigacts *ps);
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struct sigacts *sigacts_hold(struct sigacts *ps);
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int sigacts_shared(struct sigacts *ps);
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int sig_ast_checksusp(struct thread *td);
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int sig_ast_needsigchk(struct thread *td);
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void sig_drop_caught(struct proc *p);
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void sigexit(struct thread *td, int sig) __dead2;
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int sigev_findtd(struct proc *p, struct sigevent *sigev, struct thread **);
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void sigfastblock_clear(struct thread *td);
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void sigfastblock_fetch(struct thread *td);
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int sig_intr(void);
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void siginit(struct proc *p);
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void signotify(struct thread *td);
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void sigqueue_delete(struct sigqueue *queue, int sig);
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void sigqueue_delete_proc(struct proc *p, int sig);
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void sigqueue_flush(struct sigqueue *queue);
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void sigqueue_init(struct sigqueue *queue, struct proc *p);
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void sigqueue_take(ksiginfo_t *ksi);
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void tdksignal(struct thread *td, int sig, ksiginfo_t *ksi);
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int tdsendsignal(struct proc *p, struct thread *td, int sig,
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ksiginfo_t *ksi);
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void tdsigcleanup(struct thread *td);
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void tdsignal(struct thread *td, int sig);
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void trapsignal(struct thread *td, ksiginfo_t *ksi);
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#endif /* _KERNEL */
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#endif /* !_SYS_SIGNALVAR_H_ */
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