/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)signalvar.h 8.6 (Berkeley) 2/19/95
* $FreeBSD$
*/
#ifndef _SYS_SIGNALVAR_H_
#define _SYS_SIGNALVAR_H_
#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#include <sys/signal.h>
/*
* Kernel signal definitions and data structures,
* not exported to user programs.
*/
/*
* Logical process signal actions and state, needed only within the process
* The mapping between sigacts and proc structures is 1:1 except for rfork()
* processes masquerading as threads which use one structure for the whole
* group. All members are locked by the included mutex. The reference count
* and mutex must be last for the bcopy in sigacts_copy() to work.
*/
struct sigacts {
sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */
sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */
sigset_t ps_sigonstack; /* Signals to take on sigstack. */
sigset_t ps_sigintr; /* Signals that interrupt syscalls. */
sigset_t ps_sigreset; /* Signals that reset when caught. */
sigset_t ps_signodefer; /* Signals not masked while handled. */
sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */
sigset_t ps_sigignore; /* Signals being ignored. */
sigset_t ps_sigcatch; /* Signals being caught by user. */
sigset_t ps_freebsd4; /* signals using freebsd4 ucontext. */
sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */
sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */
int ps_flag;
int ps_refcnt;
struct mtx ps_mtx;
};
#define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
#define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
#define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */
#if defined(_KERNEL) && defined(COMPAT_43)
/*
* Compatibility.
*/
typedef struct {
struct osigcontext si_sc;
int si_signo;
int si_code;
union sigval si_value;
} osiginfo_t;
struct osigaction {
union {
void (*__sa_handler)(int);
void (*__sa_sigaction)(int, osiginfo_t *, void *);
} __sigaction_u; /* signal handler */
osigset_t sa_mask; /* signal mask to apply */
int sa_flags; /* see signal options below */
};
typedef void __osiginfohandler_t(int, osiginfo_t *, void *);
#endif /* _KERNEL && COMPAT_43 */
/* additional signal action values, used only temporarily/internally */
#define SIG_CATCH ((__sighandler_t *)2)
#define SIG_HOLD ((__sighandler_t *)3)
/*
* get signal action for process and signal; currently only for current process
*/
#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
/*
* sigset_t manipulation macros
*/
#define SIGADDSET(set, signo) \
((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo))
#define SIGDELSET(set, signo) \
((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo))
#define SIGEMPTYSET(set) \
do { \
int __i; \
for (__i = 0; __i < _SIG_WORDS; __i++) \
(set).__bits[__i] = 0; \
} while (0)
#define SIGFILLSET(set) \
do { \
int __i; \
for (__i = 0; __i < _SIG_WORDS; __i++) \
(set).__bits[__i] = ~0U; \
} while (0)
#define SIGISMEMBER(set, signo) \
((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
#define SIGISEMPTY(set) (__sigisempty(&(set)))
#define SIGNOTEMPTY(set) (!__sigisempty(&(set)))
#define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2)))
#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2)))
#define SIGSETOR(set1, set2) \
do { \
int __i; \
for (__i = 0; __i < _SIG_WORDS; __i++) \
(set1).__bits[__i] |= (set2).__bits[__i]; \
} while (0)
#define SIGSETAND(set1, set2) \
do { \
int __i; \
for (__i = 0; __i < _SIG_WORDS; __i++) \
(set1).__bits[__i] &= (set2).__bits[__i]; \
} while (0)
#define SIGSETNAND(set1, set2) \
do { \
int __i; \
for (__i = 0; __i < _SIG_WORDS; __i++) \
(set1).__bits[__i] &= ~(set2).__bits[__i]; \
} while (0)
#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0])
#define SIGSETOLD(set, oset) ((set).__bits[0] = (oset))
#define SIG_CANTMASK(set) \
SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
#define SIG_STOPSIGMASK(set) \
SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \
SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
#define SIG_CONTSIGMASK(set) \
SIGDELSET(set, SIGCONT)
#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
#define SIG2OSIG(sig, osig) (osig = (sig).__bits[0])
#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig
static __inline int
__sigisempty(sigset_t *set)
{
int i;
for (i = 0; i < _SIG_WORDS; i++) {
if (set->__bits[i])
return (0);
}
return (1);
}
static __inline int
__sigseteq(sigset_t *set1, sigset_t *set2)
{
int i;
for (i = 0; i < _SIG_WORDS; i++) {
if (set1->__bits[i] != set2->__bits[i])
return (0);
}
return (1);
}
#ifdef _KERNEL
/*
* Specifies the target of a signal.
* P - Doesn't matter which thread it gets delivered to.
* TD - Must be delivered to a specific thread.
*/
typedef enum sigtarget_enum { SIGTARGET_P, SIGTARGET_TD } sigtarget_t;
/* Return nonzero if process p has an unmasked pending signal. */
#define SIGPENDING(td) \
(!SIGISEMPTY((td)->td_siglist) && \
!sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask))
/*
* Return the value of the pseudo-expression ((*set & ~*mask) != 0). This
* is an optimized version of SIGISEMPTY() on a temporary variable
* containing SIGSETNAND(*set, *mask).
*/
static __inline int
sigsetmasked(sigset_t *set, sigset_t *mask)
{
int i;
for (i = 0; i < _SIG_WORDS; i++) {
if (set->__bits[i] & ~mask->__bits[i])
return (0);
}
return (1);
}
struct pgrp;
struct thread;
struct proc;
struct sigio;
struct mtx;
extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */
extern struct mtx sigio_lock;
/*
* Lock the pointers for a sigio object in the underlying objects of
* a file descriptor.
*/
#define SIGIO_LOCK() mtx_lock(&sigio_lock)
#define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock)
#define SIGIO_UNLOCK() mtx_unlock(&sigio_lock)
#define SIGIO_LOCKED() mtx_owned(&sigio_lock)
#define SIGIO_ASSERT(type) mtx_assert(&sigio_lock, type)
/*
* Machine-independent functions:
*/
int cursig(struct thread *td);
void execsigs(struct proc *p);
void gsignal(int pgid, int sig);
void killproc(struct proc *p, char *why);
void pgsigio(struct sigio **, int signum, int checkctty);
void pgsignal(struct pgrp *pgrp, int sig, int checkctty);
void postsig(int sig);
void psignal(struct proc *p, int sig);
struct sigacts *sigacts_alloc(void);
void sigacts_copy(struct sigacts *dest, struct sigacts *src);
void sigacts_free(struct sigacts *ps);
struct sigacts *sigacts_hold(struct sigacts *ps);
int sigacts_shared(struct sigacts *ps);
void sigexit(struct thread *td, int signum) __dead2;
int sig_ffs(sigset_t *set);
void siginit(struct proc *p);
void signotify(struct thread *td);
void tdsignal(struct thread *td, int sig, sigtarget_t target);
void trapsignal(struct thread *td, int sig, u_long code);
int ptracestop(struct thread *td, int sig);
/*
* Machine-dependent functions:
*/
void sendsig(sig_t action, int sig, sigset_t *retmask, u_long code);
#endif /* _KERNEL */
#endif /* !_SYS_SIGNALVAR_H_ */
