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 */ 33 34 #ifndef _SYS_SIGNALVAR_H_ 35 #define _SYS_SIGNALVAR_H_ 36 37 #include <sys/queue.h> 38 #include <sys/_lock.h> 39 #include <sys/_mutex.h> 40 #include <sys/signal.h> 41 42 /* 43 * Kernel signal definitions and data structures. 44 */ 45 46 /* 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. 52 */ 53 struct sigacts { 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 */ 66 int ps_flag; 67 u_int ps_refcnt; 68 struct mtx ps_mtx; 69 }; 70 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. */ 74 75 #ifdef _KERNEL 76 77 #ifdef COMPAT_43 78 typedef struct { 79 struct osigcontext si_sc; 80 int si_signo; 81 int si_code; 82 union sigval si_value; 83 } osiginfo_t; 84 85 struct osigaction { 86 union { 87 void (*__sa_handler)(int); 88 void (*__sa_sigaction)(int, osiginfo_t *, void *); 89 } __sigaction_u; /* signal handler */ 90 osigset_t sa_mask; /* signal mask to apply */ 91 int sa_flags; /* see signal options below */ 92 }; 93 94 typedef void __osiginfohandler_t(int, osiginfo_t *, void *); 95 #endif /* COMPAT_43 */ 96 97 /* additional signal action values, used only temporarily/internally */ 98 #define SIG_CATCH ((__sighandler_t *)2) 99 /* #define SIG_HOLD ((__sighandler_t *)3) See signal.h */ 100 101 /* 102 * get signal action for process and signal; currently only for current process 103 */ 104 #define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 105 106 #endif /* _KERNEL */ 107 108 /* 109 * sigset_t manipulation macros. 110 */ 111 #define SIGADDSET(set, signo) \ 112 ((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)) 113 114 #define SIGDELSET(set, signo) \ 115 ((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)) 116 117 #define SIGEMPTYSET(set) \ 118 do { \ 119 int __i; \ 120 for (__i = 0; __i < _SIG_WORDS; __i++) \ 121 (set).__bits[__i] = 0; \ 122 } while (0) 123 124 #define SIGFILLSET(set) \ 125 do { \ 126 int __i; \ 127 for (__i = 0; __i < _SIG_WORDS; __i++) \ 128 (set).__bits[__i] = ~0U; \ 129 } while (0) 130 131 #define SIGISMEMBER(set, signo) \ 132 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) 133 134 #define SIGISEMPTY(set) (__sigisempty(&(set))) 135 #define SIGNOTEMPTY(set) (!__sigisempty(&(set))) 136 137 #define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2))) 138 #define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2))) 139 140 #define SIGSETOR(set1, set2) \ 141 do { \ 142 int __i; \ 143 for (__i = 0; __i < _SIG_WORDS; __i++) \ 144 (set1).__bits[__i] |= (set2).__bits[__i]; \ 145 } while (0) 146 147 #define SIGSETAND(set1, set2) \ 148 do { \ 149 int __i; \ 150 for (__i = 0; __i < _SIG_WORDS; __i++) \ 151 (set1).__bits[__i] &= (set2).__bits[__i]; \ 152 } while (0) 153 154 #define SIGSETNAND(set1, set2) \ 155 do { \ 156 int __i; \ 157 for (__i = 0; __i < _SIG_WORDS; __i++) \ 158 (set1).__bits[__i] &= ~(set2).__bits[__i]; \ 159 } while (0) 160 161 #define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0]) 162 #define SIGSETOLD(set, oset) ((set).__bits[0] = (oset)) 163 164 #define SIG_CANTMASK(set) \ 165 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP) 166 167 #define SIG_STOPSIGMASK(set) \ 168 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \ 169 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU) 170 171 #define SIG_CONTSIGMASK(set) \ 172 SIGDELSET(set, SIGCONT) 173 174 #define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP)) 175 176 #define SIG2OSIG(sig, osig) (osig = (sig).__bits[0]) 177 #define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig 178 179 static __inline int 180 __sigisempty(sigset_t *set) 181 { 182 int i; 183 184 for (i = 0; i < _SIG_WORDS; i++) { 185 if (set->__bits[i]) 186 return (0); 187 } 188 return (1); 189 } 190 191 static __inline int 192 __sigseteq(sigset_t *set1, sigset_t *set2) 193 { 194 int i; 195 196 for (i = 0; i < _SIG_WORDS; i++) { 197 if (set1->__bits[i] != set2->__bits[i]) 198 return (0); 199 } 200 return (1); 201 } 202 203 #ifdef COMPAT_FREEBSD6 204 struct osigevent { 205 int sigev_notify; /* Notification type */ 206 union { 207 int __sigev_signo; /* Signal number */ 208 int __sigev_notify_kqueue; 209 } __sigev_u; 210 union sigval sigev_value; /* Signal value */ 211 }; 212 #endif 213 214 typedef struct ksiginfo { 215 TAILQ_ENTRY(ksiginfo) ksi_link; 216 siginfo_t ksi_info; 217 int ksi_flags; 218 struct sigqueue *ksi_sigq; 219 } ksiginfo_t; 220 221 #define ksi_signo ksi_info.si_signo 222 #define ksi_errno ksi_info.si_errno 223 #define ksi_code ksi_info.si_code 224 #define ksi_pid ksi_info.si_pid 225 #define ksi_uid ksi_info.si_uid 226 #define ksi_status ksi_info.si_status 227 #define ksi_addr ksi_info.si_addr 228 #define ksi_value ksi_info.si_value 229 #define ksi_band ksi_info.si_band 230 #define ksi_trapno ksi_info.si_trapno 231 #define ksi_overrun ksi_info.si_overrun 232 #define ksi_timerid ksi_info.si_timerid 233 #define ksi_mqd ksi_info.si_mqd 234 235 /* bits for ksi_flags */ 236 #define KSI_TRAP 0x01 /* Generated by trap. */ 237 #define KSI_EXT 0x02 /* Externally managed ksi. */ 238 #define KSI_INS 0x04 /* Directly insert ksi, not the copy */ 239 #define KSI_SIGQ 0x08 /* Generated by sigqueue, might ret EAGAIN. */ 240 #define KSI_HEAD 0x10 /* Insert into head, not tail. */ 241 #define KSI_PTRACE 0x20 /* Generated by ptrace. */ 242 #define KSI_COPYMASK (KSI_TRAP | KSI_SIGQ | KSI_PTRACE) 243 244 #define KSI_ONQ(ksi) ((ksi)->ksi_sigq != NULL) 245 246 typedef struct sigqueue { 247 sigset_t sq_signals; /* All pending signals. */ 248 sigset_t sq_kill; /* Legacy depth 1 queue. */ 249 sigset_t sq_ptrace; /* Depth 1 queue for ptrace(2). */ 250 TAILQ_HEAD(, ksiginfo) sq_list;/* Queued signal info. */ 251 struct proc *sq_proc; 252 int sq_flags; 253 } sigqueue_t; 254 255 /* Flags for ksi_flags */ 256 #define SQ_INIT 0x01 257 258 /* 259 * Fast_sigblock 260 */ 261 #define SIGFASTBLOCK_SETPTR 1 262 #define SIGFASTBLOCK_UNBLOCK 2 263 #define SIGFASTBLOCK_UNSETPTR 3 264 265 #define SIGFASTBLOCK_PEND 0x1 266 #define SIGFASTBLOCK_FLAGS 0xf 267 #define SIGFASTBLOCK_INC 0x10 268 269 #ifndef _KERNEL 270 int __sys_sigfastblock(int cmd, void *ptr); 271 #endif 272 273 #ifdef _KERNEL 274 extern bool sigfastblock_fetch_always; 275 276 /* Return nonzero if process p has an unmasked pending signal. */ 277 #define SIGPENDING(td) \ 278 ((!SIGISEMPTY((td)->td_siglist) && \ 279 !sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask)) || \ 280 (!SIGISEMPTY((td)->td_proc->p_siglist) && \ 281 !sigsetmasked(&(td)->td_proc->p_siglist, &(td)->td_sigmask))) 282 /* 283 * Return the value of the pseudo-expression ((*set & ~*mask) == 0). This 284 * is an optimized version of SIGISEMPTY() on a temporary variable 285 * containing SIGSETNAND(*set, *mask). 286 */ 287 static __inline bool 288 sigsetmasked(sigset_t *set, sigset_t *mask) 289 { 290 int i; 291 292 for (i = 0; i < _SIG_WORDS; i++) { 293 if (set->__bits[i] & ~mask->__bits[i]) 294 return (false); 295 } 296 return (true); 297 } 298 299 #define ksiginfo_init(ksi) \ 300 do { \ 301 bzero(ksi, sizeof(ksiginfo_t)); \ 302 } while (0) 303 304 #define ksiginfo_init_trap(ksi) \ 305 do { \ 306 ksiginfo_t *kp = ksi; \ 307 bzero(kp, sizeof(ksiginfo_t)); \ 308 kp->ksi_flags |= KSI_TRAP; \ 309 } while (0) 310 311 static __inline void 312 ksiginfo_copy(ksiginfo_t *src, ksiginfo_t *dst) 313 { 314 (dst)->ksi_info = src->ksi_info; 315 (dst)->ksi_flags = (src->ksi_flags & KSI_COPYMASK); 316 } 317 318 static __inline void 319 ksiginfo_set_sigev(ksiginfo_t *dst, struct sigevent *sigev) 320 { 321 dst->ksi_signo = sigev->sigev_signo; 322 dst->ksi_value = sigev->sigev_value; 323 } 324 325 struct pgrp; 326 struct proc; 327 struct sigio; 328 struct thread; 329 330 /* 331 * Lock the pointers for a sigio object in the underlying objects of 332 * a file descriptor. 333 */ 334 #define SIGIO_LOCK() mtx_lock(&sigio_lock) 335 #define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock) 336 #define SIGIO_UNLOCK() mtx_unlock(&sigio_lock) 337 #define SIGIO_LOCKED() mtx_owned(&sigio_lock) 338 #define SIGIO_ASSERT_LOCKED() mtx_assert(&sigio_lock, MA_OWNED) 339 340 extern struct mtx sigio_lock; 341 342 /* Flags for kern_sigprocmask(). */ 343 #define SIGPROCMASK_OLD 0x0001 344 #define SIGPROCMASK_PROC_LOCKED 0x0002 345 #define SIGPROCMASK_PS_LOCKED 0x0004 346 #define SIGPROCMASK_FASTBLK 0x0008 347 348 /* 349 * Modes for sigdeferstop(). Manages behaviour of 350 * thread_suspend_check() in the region delimited by 351 * sigdeferstop()/sigallowstop(). Must be restored to 352 * SIGDEFERSTOP_OFF before returning to userspace. 353 */ 354 #define SIGDEFERSTOP_NOP 0 /* continue doing whatever is done now */ 355 #define SIGDEFERSTOP_OFF 1 /* stop ignoring STOPs */ 356 #define SIGDEFERSTOP_SILENT 2 /* silently ignore STOPs */ 357 #define SIGDEFERSTOP_EINTR 3 /* ignore STOPs, return EINTR */ 358 #define SIGDEFERSTOP_ERESTART 4 /* ignore STOPs, return ERESTART */ 359 360 #define SIGDEFERSTOP_VAL_NCHG (-1) /* placeholder indicating no state change */ 361 int sigdeferstop_impl(int mode); 362 void sigallowstop_impl(int prev); 363 364 static inline int 365 sigdeferstop(int mode) 366 { 367 368 if (__predict_false(mode == SIGDEFERSTOP_NOP)) 369 return (SIGDEFERSTOP_VAL_NCHG); 370 return (sigdeferstop_impl(mode)); 371 } 372 373 static inline void 374 sigallowstop(int prev) 375 { 376 377 if (__predict_true(prev == SIGDEFERSTOP_VAL_NCHG)) 378 return; 379 sigallowstop_impl(prev); 380 } 381 382 int cursig(struct thread *td); 383 void execsigs(struct proc *p); 384 void killproc(struct proc *p, const char *why); 385 ksiginfo_t *ksiginfo_alloc(int mwait); 386 void ksiginfo_free(ksiginfo_t *ksi); 387 int pksignal(struct proc *p, int sig, ksiginfo_t *ksi); 388 void pgsigio(struct sigio **sigiop, int sig, int checkctty); 389 void pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi); 390 int postsig(int sig); 391 void kern_psignal(struct proc *p, int sig); 392 int ptracestop(struct thread *td, int sig, ksiginfo_t *si); 393 void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *retmask); 394 struct sigacts *sigacts_alloc(void); 395 void sigacts_copy(struct sigacts *dest, struct sigacts *src); 396 void sigacts_free(struct sigacts *ps); 397 struct sigacts *sigacts_hold(struct sigacts *ps); 398 int sigacts_shared(struct sigacts *ps); 399 int sig_ast_checksusp(struct thread *td); 400 int sig_ast_needsigchk(struct thread *td); 401 void sig_drop_caught(struct proc *p); 402 void sigexit(struct thread *td, int sig) __dead2; 403 int sigev_findtd(struct proc *p, struct sigevent *sigev, struct thread **); 404 void sigfastblock_clear(struct thread *td); 405 void sigfastblock_fetch(struct thread *td); 406 int sig_intr(void); 407 void siginit(struct proc *p); 408 void signotify(struct thread *td); 409 void sigqueue_delete(struct sigqueue *queue, int sig); 410 void sigqueue_delete_proc(struct proc *p, int sig); 411 void sigqueue_flush(struct sigqueue *queue); 412 void sigqueue_init(struct sigqueue *queue, struct proc *p); 413 void sigqueue_take(ksiginfo_t *ksi); 414 void tdksignal(struct thread *td, int sig, ksiginfo_t *ksi); 415 int tdsendsignal(struct proc *p, struct thread *td, int sig, 416 ksiginfo_t *ksi); 417 void tdsigcleanup(struct thread *td); 418 void tdsignal(struct thread *td, int sig); 419 void trapsignal(struct thread *td, ksiginfo_t *ksi); 420 421 #endif /* _KERNEL */ 422 423 #endif /* !_SYS_SIGNALVAR_H_ */ 424