1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)signalvar.h 8.6 (Berkeley) 2/19/95 32 * $FreeBSD$ 33 */ 34 35#ifndef _SYS_SIGNALVAR_H_ 36#define _SYS_SIGNALVAR_H_ 37 38#include <sys/queue.h> 39#include <sys/_lock.h> 40#include <sys/_mutex.h> 41#include <sys/signal.h> 42 43/* 44 * Kernel signal definitions and data structures. 45 */ 46 47/* 48 * Logical process signal actions and state, needed only within the process 49 * The mapping between sigacts and proc structures is 1:1 except for rfork() 50 * processes masquerading as threads which use one structure for the whole 51 * group. All members are locked by the included mutex. The reference count 52 * and mutex must be last for the bcopy in sigacts_copy() to work. 53 */ 54struct sigacts { 55 sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */ 56 sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */ 57 sigset_t ps_sigonstack; /* Signals to take on sigstack. */ 58 sigset_t ps_sigintr; /* Signals that interrupt syscalls. */ 59 sigset_t ps_sigreset; /* Signals that reset when caught. */ 60 sigset_t ps_signodefer; /* Signals not masked while handled. */ 61 sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */ 62 sigset_t ps_sigignore; /* Signals being ignored. */ 63 sigset_t ps_sigcatch; /* Signals being caught by user. */ 64 sigset_t ps_freebsd4; /* Signals using freebsd4 ucontext. */ 65 sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */ 66 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */ 67 int ps_flag; 68 u_int ps_refcnt; 69 struct mtx ps_mtx; 70}; 71 72#define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */ 73#define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */ 74#define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */ 75 76#ifdef _KERNEL 77 78#ifdef COMPAT_43 79typedef struct { 80 struct osigcontext si_sc; 81 int si_signo; 82 int si_code; 83 union sigval si_value; 84} osiginfo_t; 85 86struct osigaction { 87 union { 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 */ 93}; 94 95typedef void __osiginfohandler_t(int, osiginfo_t *, void *); 96#endif /* COMPAT_43 */ 97 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 */ 101 102/* 103 * get signal action for process and signal; currently only for current process 104 */ 105#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 106 107#endif /* _KERNEL */ 108 109/* 110 * sigset_t manipulation macros. 111 */ 112#define SIGADDSET(set, signo) \ 113 ((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)) 114 115#define SIGDELSET(set, signo) \ 116 ((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)) 117 118#define SIGEMPTYSET(set) \ 119 do { \ 120 int __i; \ 121 for (__i = 0; __i < _SIG_WORDS; __i++) \ 122 (set).__bits[__i] = 0; \ 123 } while (0) 124 125#define SIGFILLSET(set) \ 126 do { \ 127 int __i; \ 128 for (__i = 0; __i < _SIG_WORDS; __i++) \ 129 (set).__bits[__i] = ~0U; \ 130 } while (0) 131 132#define SIGISMEMBER(set, signo) \ 133 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) 134 135#define SIGISEMPTY(set) (__sigisempty(&(set))) 136#define SIGNOTEMPTY(set) (!__sigisempty(&(set))) 137 138#define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2))) 139#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2))) 140 141#define SIGSETOR(set1, set2) \ 142 do { \ 143 int __i; \ 144 for (__i = 0; __i < _SIG_WORDS; __i++) \ 145 (set1).__bits[__i] |= (set2).__bits[__i]; \ 146 } while (0) 147 148#define SIGSETAND(set1, set2) \ 149 do { \ 150 int __i; \ 151 for (__i = 0; __i < _SIG_WORDS; __i++) \ 152 (set1).__bits[__i] &= (set2).__bits[__i]; \ 153 } while (0) 154 155#define SIGSETNAND(set1, set2) \ 156 do { \ 157 int __i; \ 158 for (__i = 0; __i < _SIG_WORDS; __i++) \ 159 (set1).__bits[__i] &= ~(set2).__bits[__i]; \ 160 } while (0) 161 162#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0]) 163#define SIGSETOLD(set, oset) ((set).__bits[0] = (oset)) 164 165#define SIG_CANTMASK(set) \ 166 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP) 167 168#define SIG_STOPSIGMASK(set) \ 169 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \ 170 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU) 171 172#define SIG_CONTSIGMASK(set) \ 173 SIGDELSET(set, SIGCONT) 174 175#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP)) 176 177#define SIG2OSIG(sig, osig) (osig = (sig).__bits[0]) 178#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig 179 180static __inline int 181__sigisempty(sigset_t *set) 182{ 183 int i; 184 185 for (i = 0; i < _SIG_WORDS; i++) { 186 if (set->__bits[i]) 187 return (0); 188 } 189 return (1); 190} 191 192static __inline int 193__sigseteq(sigset_t *set1, sigset_t *set2) 194{ 195 int i; 196 197 for (i = 0; i < _SIG_WORDS; i++) { 198 if (set1->__bits[i] != set2->__bits[i]) 199 return (0); 200 } 201 return (1); 202} 203 204#ifdef COMPAT_FREEBSD6 205struct osigevent { 206 int sigev_notify; /* Notification type */ 207 union { 208 int __sigev_signo; /* Signal number */ 209 int __sigev_notify_kqueue; 210 } __sigev_u; 211 union sigval sigev_value; /* Signal value */ 212}; 213#endif 214 215typedef struct ksiginfo { 216 TAILQ_ENTRY(ksiginfo) ksi_link; 217 siginfo_t ksi_info; 218 int ksi_flags; 219 struct sigqueue *ksi_sigq; 220} ksiginfo_t; 221 222#define ksi_signo ksi_info.si_signo 223#define ksi_errno ksi_info.si_errno 224#define ksi_code ksi_info.si_code 225#define ksi_pid ksi_info.si_pid 226#define ksi_uid ksi_info.si_uid 227#define ksi_status ksi_info.si_status 228#define ksi_addr ksi_info.si_addr 229#define ksi_value ksi_info.si_value 230#define ksi_band ksi_info.si_band 231#define ksi_trapno ksi_info.si_trapno 232#define ksi_overrun ksi_info.si_overrun 233#define ksi_timerid ksi_info.si_timerid 234#define ksi_mqd ksi_info.si_mqd 235 236/* bits for ksi_flags */ 237#define KSI_TRAP 0x01 /* Generated by trap. */ 238#define KSI_EXT 0x02 /* Externally managed ksi. */ 239#define KSI_INS 0x04 /* Directly insert ksi, not the copy */ 240#define KSI_SIGQ 0x08 /* Generated by sigqueue, might ret EAGAIN. */ 241#define KSI_HEAD 0x10 /* Insert into head, not tail. */ 242#define KSI_PTRACE 0x20 /* Generated by ptrace. */ 243#define KSI_COPYMASK (KSI_TRAP | KSI_SIGQ | KSI_PTRACE) 244 245#define KSI_ONQ(ksi) ((ksi)->ksi_sigq != NULL) 246 247typedef struct sigqueue { 248 sigset_t sq_signals; /* All pending signals. */ 249 sigset_t sq_kill; /* Legacy depth 1 queue. */ 250 sigset_t sq_ptrace; /* Depth 1 queue for ptrace(2). */ 251 TAILQ_HEAD(, ksiginfo) sq_list;/* Queued signal info. */ 252 struct proc *sq_proc; 253 int sq_flags; 254} sigqueue_t; 255 256/* Flags for ksi_flags */ 257#define SQ_INIT 0x01 258 259/* 260 * Fast_sigblock 261 */ 262#define SIGFASTBLOCK_SETPTR 1 263#define SIGFASTBLOCK_UNBLOCK 2 264#define SIGFASTBLOCK_UNSETPTR 3 265 266#define SIGFASTBLOCK_PEND 0x1 267#define SIGFASTBLOCK_FLAGS 0xf 268#define SIGFASTBLOCK_INC 0x10 269 270#ifndef _KERNEL 271int __sys_sigfastblock(int cmd, void *ptr); 272#endif 273 274#ifdef _KERNEL 275extern sigset_t fastblock_mask; 276extern bool sigfastblock_fetch_always; 277 278/* Return nonzero if process p has an unmasked pending signal. */ 279#define SIGPENDING(td) \ 280 ((!SIGISEMPTY((td)->td_siglist) && \ 281 !sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask)) || \ 282 (!SIGISEMPTY((td)->td_proc->p_siglist) && \ 283 !sigsetmasked(&(td)->td_proc->p_siglist, &(td)->td_sigmask))) 284/* 285 * Return the value of the pseudo-expression ((*set & ~*mask) == 0). This 286 * is an optimized version of SIGISEMPTY() on a temporary variable 287 * containing SIGSETNAND(*set, *mask). 288 */ 289static __inline bool 290sigsetmasked(sigset_t *set, sigset_t *mask) 291{ 292 int i; 293 294 for (i = 0; i < _SIG_WORDS; i++) { 295 if (set->__bits[i] & ~mask->__bits[i]) 296 return (false); 297 } 298 return (true); 299} 300 301#define ksiginfo_init(ksi) \ 302do { \ 303 bzero(ksi, sizeof(ksiginfo_t)); \ 304} while(0) 305 306#define ksiginfo_init_trap(ksi) \ 307do { \ 308 ksiginfo_t *kp = ksi; \ 309 bzero(kp, sizeof(ksiginfo_t)); \ 310 kp->ksi_flags |= KSI_TRAP; \ 311} while(0) 312 313static __inline void 314ksiginfo_copy(ksiginfo_t *src, ksiginfo_t *dst) 315{ 316 (dst)->ksi_info = src->ksi_info; 317 (dst)->ksi_flags = (src->ksi_flags & KSI_COPYMASK); 318} 319 320static __inline void 321ksiginfo_set_sigev(ksiginfo_t *dst, struct sigevent *sigev) 322{ 323 dst->ksi_signo = sigev->sigev_signo; 324 dst->ksi_value = sigev->sigev_value; 325} 326 327struct pgrp; 328struct proc; 329struct sigio; 330struct thread; 331 332/* 333 * Lock the pointers for a sigio object in the underlying objects of 334 * a file descriptor. 335 */ 336#define SIGIO_LOCK() mtx_lock(&sigio_lock) 337#define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock) 338#define SIGIO_UNLOCK() mtx_unlock(&sigio_lock) 339#define SIGIO_LOCKED() mtx_owned(&sigio_lock) 340#define SIGIO_ASSERT_LOCKED() mtx_assert(&sigio_lock, MA_OWNED) 341 342extern struct mtx sigio_lock; 343 344/* Flags for kern_sigprocmask(). */ 345#define SIGPROCMASK_OLD 0x0001 346#define SIGPROCMASK_PROC_LOCKED 0x0002 347#define SIGPROCMASK_PS_LOCKED 0x0004 348#define SIGPROCMASK_FASTBLK 0x0008 349 350/* 351 * Modes for sigdeferstop(). Manages behaviour of 352 * thread_suspend_check() in the region delimited by 353 * sigdeferstop()/sigallowstop(). Must be restored to 354 * SIGDEFERSTOP_OFF before returning to userspace. 355 */ 356#define SIGDEFERSTOP_NOP 0 /* continue doing whatever is done now */ 357#define SIGDEFERSTOP_OFF 1 /* stop ignoring STOPs */ 358#define SIGDEFERSTOP_SILENT 2 /* silently ignore STOPs */ 359#define SIGDEFERSTOP_EINTR 3 /* ignore STOPs, return EINTR */ 360#define SIGDEFERSTOP_ERESTART 4 /* ignore STOPs, return ERESTART */ 361 362#define SIGDEFERSTOP_VAL_NCHG (-1) /* placeholder indicating no state change */ 363int sigdeferstop_impl(int mode); 364void sigallowstop_impl(int prev); 365 366static inline int 367sigdeferstop(int mode) 368{ 369 370 if (__predict_false(mode == SIGDEFERSTOP_NOP)) 371 return (SIGDEFERSTOP_VAL_NCHG); 372 return (sigdeferstop_impl(mode)); 373} 374 375static inline void 376sigallowstop(int prev) 377{ 378 379 if (__predict_true(prev == SIGDEFERSTOP_VAL_NCHG)) 380 return; 381 sigallowstop_impl(prev); 382} 383 384int cursig(struct thread *td); 385void execsigs(struct proc *p); 386void gsignal(int pgid, int sig, ksiginfo_t *ksi); 387void killproc(struct proc *p, const char *why); 388ksiginfo_t * ksiginfo_alloc(int wait); 389void ksiginfo_free(ksiginfo_t *ksi); 390int pksignal(struct proc *p, int sig, ksiginfo_t *ksi); 391void pgsigio(struct sigio **sigiop, int sig, int checkctty); 392void pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi); 393int postsig(int sig); 394void kern_psignal(struct proc *p, int sig); 395int ptracestop(struct thread *td, int sig, ksiginfo_t *si); 396void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *retmask); 397struct sigacts *sigacts_alloc(void); 398void sigacts_copy(struct sigacts *dest, struct sigacts *src); 399void sigacts_free(struct sigacts *ps); 400struct sigacts *sigacts_hold(struct sigacts *ps); 401int sigacts_shared(struct sigacts *ps); 402int sig_ast_checksusp(struct thread *td); 403int sig_ast_needsigchk(struct thread *td); 404void sig_drop_caught(struct proc *p); 405void sigexit(struct thread *td, int sig) __dead2; 406int sigev_findtd(struct proc *p, struct sigevent *sigev, struct thread **); 407int sig_ffs(sigset_t *set); 408void sigfastblock_clear(struct thread *td); 409void sigfastblock_fetch(struct thread *td); 410void sigfastblock_setpend(struct thread *td, bool resched); 411int sig_intr(void); 412void siginit(struct proc *p); 413void signotify(struct thread *td); 414void sigqueue_delete(struct sigqueue *queue, int sig); 415void sigqueue_delete_proc(struct proc *p, int sig); 416void sigqueue_flush(struct sigqueue *queue); 417void sigqueue_init(struct sigqueue *queue, struct proc *p); 418void sigqueue_take(ksiginfo_t *ksi); 419void tdksignal(struct thread *td, int sig, ksiginfo_t *ksi); 420int tdsendsignal(struct proc *p, struct thread *td, int sig, 421 ksiginfo_t *ksi); 422void tdsigcleanup(struct thread *td); 423void tdsignal(struct thread *td, int sig); 424void trapsignal(struct thread *td, ksiginfo_t *ksi); 425 426#endif /* _KERNEL */ 427 428#endif /* !_SYS_SIGNALVAR_H_ */ 429