289 lines
8.9 KiB
C
289 lines
8.9 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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* 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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* @(#)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)
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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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#ifdef _KERNEL
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/*
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* Specifies the target of a signal.
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* P - Doesn't matter which thread it gets delivered to.
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* TD - Must be delivered to a specific thread.
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*/
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typedef enum sigtarget_enum { SIGTARGET_P, SIGTARGET_TD } sigtarget_t;
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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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(td)->td_proc->p_flag & P_TRACED))
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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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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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/*
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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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/*
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* Machine-independent functions:
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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);
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void killproc(struct proc *p, char *why);
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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);
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void postsig(int sig);
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void psignal(struct proc *p, int sig);
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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 tdsignal(struct thread *td, int sig, sigtarget_t target);
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void trapsignal(struct thread *td, int sig, u_long code);
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void ptracestop(struct thread *td, int sig);
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/*
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* Machine-dependent functions:
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*/
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void sendsig(sig_t action, int sig, sigset_t *retmask, u_long code);
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#endif /* _KERNEL */
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#endif /* !_SYS_SIGNALVAR_H_ */
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