9a6ceacede
from SUSv4 XSI. Note that the functions are obsoleted, and only provided to ease porting from System V-like systems. Since sigpause already exists in compat with different interface, XSI sigpause is named xsi_sigpause. Reviewed by: davidxu MFC after: 3 weeks
379 lines
12 KiB
C
379 lines
12 KiB
C
/*-
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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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* 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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* @(#)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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* not exported to user programs.
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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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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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#if defined(_KERNEL) && defined(COMPAT_43)
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/*
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* Compatibility.
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*/
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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 /* _KERNEL && 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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/*
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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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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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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 EGAIN. */
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#define KSI_COPYMASK (KSI_TRAP|KSI_SIGQ)
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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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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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#ifdef _KERNEL
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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 int
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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 (0);
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}
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return (1);
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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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struct pgrp;
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struct thread;
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struct proc;
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struct sigio;
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struct mtx;
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extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */
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extern struct mtx sigio_lock;
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extern int kern_logsigexit; /* Sysctl variable kern.logsigexit */
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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(type) mtx_assert(&sigio_lock, type)
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/* stop_allowed parameter for cursig */
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#define SIG_STOP_ALLOWED 100
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#define SIG_STOP_NOT_ALLOWED 101
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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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/*
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* Machine-independent functions:
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*/
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int cursig(struct thread *td, int stop_allowed);
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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, char *why);
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void pksignal(struct proc *p, int sig, ksiginfo_t *ksi);
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void pgsigio(struct sigio **, int signum, 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 psignal(struct proc *p, int sig);
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int psignal_event(struct proc *p, struct sigevent *, ksiginfo_t *);
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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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void sigexit(struct thread *td, int signum) __dead2;
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int sig_ffs(sigset_t *set);
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void siginit(struct proc *p);
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void signotify(struct thread *td);
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void tdsigcleanup(struct thread *td);
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int tdsignal(struct proc *p, struct thread *td, int sig,
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ksiginfo_t *ksi);
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void trapsignal(struct thread *td, ksiginfo_t *);
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int ptracestop(struct thread *td, int sig);
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ksiginfo_t * ksiginfo_alloc(int);
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void ksiginfo_free(ksiginfo_t *);
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void sigqueue_init(struct sigqueue *queue, struct proc *p);
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void sigqueue_flush(struct sigqueue *queue);
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void sigqueue_delete_proc(struct proc *p, int sig);
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void sigqueue_delete_set(struct sigqueue *queue, sigset_t *set);
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void sigqueue_delete(struct sigqueue *queue, int sig);
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void sigqueue_move_set(struct sigqueue *src, sigqueue_t *dst, sigset_t *);
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int sigqueue_get(struct sigqueue *queue, int sig, ksiginfo_t *info);
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int sigqueue_add(struct sigqueue *queue, int sig, ksiginfo_t *info);
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void sigqueue_collect_set(struct sigqueue *queue, sigset_t *set);
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void sigqueue_move(struct sigqueue *, struct sigqueue *, int sig);
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void sigqueue_delete_set_proc(struct proc *, sigset_t *);
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void sigqueue_delete_stopmask_proc(struct proc *);
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void sigqueue_take(ksiginfo_t *ksi);
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int kern_sigtimedwait(struct thread *, sigset_t,
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ksiginfo_t *, struct timespec *);
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int kern_sigprocmask(struct thread *td, int how,
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sigset_t *set, sigset_t *oset, int flags);
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/*
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* Machine-dependent functions:
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*/
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void sendsig(sig_t, ksiginfo_t *, sigset_t *retmask);
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#endif /* _KERNEL */
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#endif /* !_SYS_SIGNALVAR_H_ */
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