2 * Copyright (c) 1991, 1993
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29 * @(#)signalvar.h 8.6 (Berkeley) 2/19/95
33 #ifndef _SYS_SIGNALVAR_H_
34 #define _SYS_SIGNALVAR_H_
36 #include <sys/queue.h>
37 #include <sys/_lock.h>
38 #include <sys/_mutex.h>
39 #include <sys/signal.h>
42 * Kernel signal definitions and data structures,
43 * not exported to user programs.
47 * Logical process signal actions and state, needed only within the process
48 * The mapping between sigacts and proc structures is 1:1 except for rfork()
49 * processes masquerading as threads which use one structure for the whole
50 * group. All members are locked by the included mutex. The reference count
51 * and mutex must be last for the bcopy in sigacts_copy() to work.
54 sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */
55 sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */
56 sigset_t ps_sigonstack; /* Signals to take on sigstack. */
57 sigset_t ps_sigintr; /* Signals that interrupt syscalls. */
58 sigset_t ps_sigreset; /* Signals that reset when caught. */
59 sigset_t ps_signodefer; /* Signals not masked while handled. */
60 sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */
61 sigset_t ps_sigignore; /* Signals being ignored. */
62 sigset_t ps_sigcatch; /* Signals being caught by user. */
63 sigset_t ps_freebsd4; /* signals using freebsd4 ucontext. */
64 sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */
65 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */
71 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
72 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
73 #define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */
75 #if defined(_KERNEL) && defined(COMPAT_43)
80 struct osigcontext si_sc;
83 union sigval si_value;
88 void (*__sa_handler)(int);
89 void (*__sa_sigaction)(int, osiginfo_t *, void *);
90 } __sigaction_u; /* signal handler */
91 osigset_t sa_mask; /* signal mask to apply */
92 int sa_flags; /* see signal options below */
95 typedef void __osiginfohandler_t(int, osiginfo_t *, void *);
96 #endif /* _KERNEL && COMPAT_43 */
98 /* additional signal action values, used only temporarily/internally */
99 #define SIG_CATCH ((__sighandler_t *)2)
100 /* #define SIG_HOLD ((__sighandler_t *)3) See signal.h */
103 * get signal action for process and signal; currently only for current process
105 #define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
108 * sigset_t manipulation macros
110 #define SIGADDSET(set, signo) \
111 ((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo))
113 #define SIGDELSET(set, signo) \
114 ((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo))
116 #define SIGEMPTYSET(set) \
119 for (__i = 0; __i < _SIG_WORDS; __i++) \
120 (set).__bits[__i] = 0; \
123 #define SIGFILLSET(set) \
126 for (__i = 0; __i < _SIG_WORDS; __i++) \
127 (set).__bits[__i] = ~0U; \
130 #define SIGISMEMBER(set, signo) \
131 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
133 #define SIGISEMPTY(set) (__sigisempty(&(set)))
134 #define SIGNOTEMPTY(set) (!__sigisempty(&(set)))
136 #define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2)))
137 #define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2)))
139 #define SIGSETOR(set1, set2) \
142 for (__i = 0; __i < _SIG_WORDS; __i++) \
143 (set1).__bits[__i] |= (set2).__bits[__i]; \
146 #define SIGSETAND(set1, set2) \
149 for (__i = 0; __i < _SIG_WORDS; __i++) \
150 (set1).__bits[__i] &= (set2).__bits[__i]; \
153 #define SIGSETNAND(set1, set2) \
156 for (__i = 0; __i < _SIG_WORDS; __i++) \
157 (set1).__bits[__i] &= ~(set2).__bits[__i]; \
160 #define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0])
161 #define SIGSETOLD(set, oset) ((set).__bits[0] = (oset))
163 #define SIG_CANTMASK(set) \
164 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
166 #define SIG_STOPSIGMASK(set) \
167 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \
168 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
170 #define SIG_CONTSIGMASK(set) \
171 SIGDELSET(set, SIGCONT)
173 #define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
175 #define SIG2OSIG(sig, osig) (osig = (sig).__bits[0])
176 #define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig
179 __sigisempty(sigset_t *set)
183 for (i = 0; i < _SIG_WORDS; i++) {
191 __sigseteq(sigset_t *set1, sigset_t *set2)
195 for (i = 0; i < _SIG_WORDS; i++) {
196 if (set1->__bits[i] != set2->__bits[i])
203 int sigev_notify; /* Notification type */
205 int __sigev_signo; /* Signal number */
206 int __sigev_notify_kqueue;
208 union sigval sigev_value; /* Signal value */
211 typedef struct ksiginfo {
212 TAILQ_ENTRY(ksiginfo) ksi_link;
215 struct sigqueue *ksi_sigq;
218 #define ksi_signo ksi_info.si_signo
219 #define ksi_errno ksi_info.si_errno
220 #define ksi_code ksi_info.si_code
221 #define ksi_pid ksi_info.si_pid
222 #define ksi_uid ksi_info.si_uid
223 #define ksi_status ksi_info.si_status
224 #define ksi_addr ksi_info.si_addr
225 #define ksi_value ksi_info.si_value
226 #define ksi_band ksi_info.si_band
227 #define ksi_trapno ksi_info.si_trapno
228 #define ksi_overrun ksi_info.si_overrun
229 #define ksi_timerid ksi_info.si_timerid
230 #define ksi_mqd ksi_info.si_mqd
232 /* bits for ksi_flags */
233 #define KSI_TRAP 0x01 /* Generated by trap. */
234 #define KSI_EXT 0x02 /* Externally managed ksi. */
235 #define KSI_INS 0x04 /* Directly insert ksi, not the copy */
236 #define KSI_SIGQ 0x08 /* Generated by sigqueue, might ret EGAIN. */
237 #define KSI_COPYMASK (KSI_TRAP|KSI_SIGQ)
239 #define KSI_ONQ(ksi) ((ksi)->ksi_sigq != NULL)
241 typedef struct sigqueue {
242 sigset_t sq_signals; /* All pending signals. */
243 sigset_t sq_kill; /* Legacy depth 1 queue. */
244 TAILQ_HEAD(, ksiginfo) sq_list;/* Queued signal info. */
245 struct proc *sq_proc;
249 /* Flags for ksi_flags */
254 /* Return nonzero if process p has an unmasked pending signal. */
255 #define SIGPENDING(td) \
256 ((!SIGISEMPTY((td)->td_siglist) && \
257 !sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask)) || \
258 (!SIGISEMPTY((td)->td_proc->p_siglist) && \
259 !sigsetmasked(&(td)->td_proc->p_siglist, &(td)->td_sigmask)))
261 * Return the value of the pseudo-expression ((*set & ~*mask) != 0). This
262 * is an optimized version of SIGISEMPTY() on a temporary variable
263 * containing SIGSETNAND(*set, *mask).
266 sigsetmasked(sigset_t *set, sigset_t *mask)
270 for (i = 0; i < _SIG_WORDS; i++) {
271 if (set->__bits[i] & ~mask->__bits[i])
277 #define ksiginfo_init(ksi) \
279 bzero(ksi, sizeof(ksiginfo_t)); \
282 #define ksiginfo_init_trap(ksi) \
284 ksiginfo_t *kp = ksi; \
285 bzero(kp, sizeof(ksiginfo_t)); \
286 kp->ksi_flags |= KSI_TRAP; \
290 ksiginfo_copy(ksiginfo_t *src, ksiginfo_t *dst)
292 (dst)->ksi_info = src->ksi_info;
293 (dst)->ksi_flags = (src->ksi_flags & KSI_COPYMASK);
302 extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */
303 extern struct mtx sigio_lock;
304 extern int kern_logsigexit; /* Sysctl variable kern.logsigexit */
307 * Lock the pointers for a sigio object in the underlying objects of
310 #define SIGIO_LOCK() mtx_lock(&sigio_lock)
311 #define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock)
312 #define SIGIO_UNLOCK() mtx_unlock(&sigio_lock)
313 #define SIGIO_LOCKED() mtx_owned(&sigio_lock)
314 #define SIGIO_ASSERT(type) mtx_assert(&sigio_lock, type)
316 /* stop_allowed parameter for cursig */
317 #define SIG_STOP_ALLOWED 100
318 #define SIG_STOP_NOT_ALLOWED 101
320 /* flags for kern_sigprocmask */
321 #define SIGPROCMASK_OLD 0x0001
322 #define SIGPROCMASK_PROC_LOCKED 0x0002
323 #define SIGPROCMASK_PS_LOCKED 0x0004
326 * Machine-independent functions:
328 int cursig(struct thread *td, int stop_allowed);
329 void execsigs(struct proc *p);
330 void gsignal(int pgid, int sig, ksiginfo_t *ksi);
331 void killproc(struct proc *p, char *why);
332 void pksignal(struct proc *p, int sig, ksiginfo_t *ksi);
333 void pgsigio(struct sigio **, int signum, int checkctty);
334 void pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi);
335 int postsig(int sig);
336 void psignal(struct proc *p, int sig);
337 int psignal_event(struct proc *p, struct sigevent *, ksiginfo_t *);
338 struct sigacts *sigacts_alloc(void);
339 void sigacts_copy(struct sigacts *dest, struct sigacts *src);
340 void sigacts_free(struct sigacts *ps);
341 struct sigacts *sigacts_hold(struct sigacts *ps);
342 int sigacts_shared(struct sigacts *ps);
343 void sigexit(struct thread *td, int signum) __dead2;
344 int sig_ffs(sigset_t *set);
345 void siginit(struct proc *p);
346 void signotify(struct thread *td);
347 void tdsigcleanup(struct thread *td);
348 int tdsignal(struct proc *p, struct thread *td, int sig,
350 void trapsignal(struct thread *td, ksiginfo_t *);
351 int ptracestop(struct thread *td, int sig);
352 ksiginfo_t * ksiginfo_alloc(int);
353 void ksiginfo_free(ksiginfo_t *);
354 void sigqueue_init(struct sigqueue *queue, struct proc *p);
355 void sigqueue_flush(struct sigqueue *queue);
356 void sigqueue_delete_proc(struct proc *p, int sig);
357 void sigqueue_delete_set(struct sigqueue *queue, sigset_t *set);
358 void sigqueue_delete(struct sigqueue *queue, int sig);
359 void sigqueue_move_set(struct sigqueue *src, sigqueue_t *dst, sigset_t *);
360 int sigqueue_get(struct sigqueue *queue, int sig, ksiginfo_t *info);
361 int sigqueue_add(struct sigqueue *queue, int sig, ksiginfo_t *info);
362 void sigqueue_collect_set(struct sigqueue *queue, sigset_t *set);
363 void sigqueue_move(struct sigqueue *, struct sigqueue *, int sig);
364 void sigqueue_delete_set_proc(struct proc *, sigset_t *);
365 void sigqueue_delete_stopmask_proc(struct proc *);
366 void sigqueue_take(ksiginfo_t *ksi);
367 int kern_sigtimedwait(struct thread *, sigset_t,
368 ksiginfo_t *, struct timespec *);
369 int kern_sigprocmask(struct thread *td, int how,
370 sigset_t *set, sigset_t *oset, int flags);
372 * Machine-dependent functions:
374 void sendsig(sig_t, ksiginfo_t *, sigset_t *retmask);
378 #endif /* !_SYS_SIGNALVAR_H_ */