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 */ 54 struct 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 79 typedef struct { 80 struct osigcontext si_sc; 81 int si_signo; 82 int si_code; 83 union sigval si_value; 84 } osiginfo_t; 85 86 struct 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 95 typedef 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 179 180 static __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 } 191 192 static __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 205 struct 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 214 215 typedef 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_KILLPG 0x40 /* killpg - update p_killpg_cnt */ 244 #define KSI_COPYMASK (KSI_TRAP | KSI_SIGQ | KSI_PTRACE | KSI_KILLPG) 245 246 #define KSI_ONQ(ksi) ((ksi)->ksi_sigq != NULL) 247 248 typedef struct sigqueue { 249 sigset_t sq_signals; /* All pending signals. */ 250 sigset_t sq_kill; /* Legacy depth 1 queue. */ 251 sigset_t sq_ptrace; /* Depth 1 queue for ptrace(2). */ 252 TAILQ_HEAD(, ksiginfo) sq_list;/* Queued signal info. */ 253 struct proc *sq_proc; 254 int sq_flags; 255 } sigqueue_t; 256 257 /* Flags for ksi_flags */ 258 #define SQ_INIT 0x01 259 260 /* 261 * Fast_sigblock 262 */ 263 #define SIGFASTBLOCK_SETPTR 1 264 #define SIGFASTBLOCK_UNBLOCK 2 265 #define SIGFASTBLOCK_UNSETPTR 3 266 267 #define SIGFASTBLOCK_PEND 0x1 268 #define SIGFASTBLOCK_FLAGS 0xf 269 #define SIGFASTBLOCK_INC 0x10 270 271 #ifndef _KERNEL 272 int __sys_sigfastblock(int cmd, void *ptr); 273 #endif 274 275 #ifdef _KERNEL 276 extern 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 */ 289 static __inline bool 290 sigsetmasked(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) \ 302 do { \ 303 bzero(ksi, sizeof(ksiginfo_t)); \ 304 } while (0) 305 306 #define ksiginfo_init_trap(ksi) \ 307 do { \ 308 ksiginfo_t *kp = ksi; \ 309 bzero(kp, sizeof(ksiginfo_t)); \ 310 kp->ksi_flags |= KSI_TRAP; \ 311 } while (0) 312 313 static __inline void 314 ksiginfo_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 } 319 320 static __inline void 321 ksiginfo_set_sigev(ksiginfo_t *dst, struct sigevent *sigev) 322 { 323 dst->ksi_signo = sigev->sigev_signo; 324 dst->ksi_value = sigev->sigev_value; 325 } 326 327 struct pgrp; 328 struct proc; 329 struct sigio; 330 struct 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) 341 342 extern 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 */ 363 int sigdeferstop_impl(int mode); 364 void sigallowstop_impl(int prev); 365 366 static inline int 367 sigdeferstop(int mode) 368 { 369 370 if (__predict_false(mode == SIGDEFERSTOP_NOP)) 371 return (SIGDEFERSTOP_VAL_NCHG); 372 return (sigdeferstop_impl(mode)); 373 } 374 375 static inline void 376 sigallowstop(int prev) 377 { 378 379 if (__predict_true(prev == SIGDEFERSTOP_VAL_NCHG)) 380 return; 381 sigallowstop_impl(prev); 382 } 383 384 int cursig(struct thread *td); 385 void execsigs(struct proc *p); 386 void gsignal(int pgid, int sig, ksiginfo_t *ksi); 387 void killproc(struct proc *p, const char *why); 388 ksiginfo_t *ksiginfo_alloc(int mwait); 389 void ksiginfo_free(ksiginfo_t *ksi); 390 int pksignal(struct proc *p, int sig, ksiginfo_t *ksi); 391 void pgsigio(struct sigio **sigiop, int sig, int checkctty); 392 void pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi); 393 int postsig(int sig); 394 void kern_psignal(struct proc *p, int sig); 395 int ptracestop(struct thread *td, int sig, ksiginfo_t *si); 396 void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *retmask); 397 struct sigacts *sigacts_alloc(void); 398 void sigacts_copy(struct sigacts *dest, struct sigacts *src); 399 void sigacts_free(struct sigacts *ps); 400 struct sigacts *sigacts_hold(struct sigacts *ps); 401 int sigacts_shared(struct sigacts *ps); 402 int sig_ast_checksusp(struct thread *td); 403 int sig_ast_needsigchk(struct thread *td); 404 void sig_drop_caught(struct proc *p); 405 void sigexit(struct thread *td, int sig) __dead2; 406 int sigev_findtd(struct proc *p, struct sigevent *sigev, struct thread **); 407 void sigfastblock_clear(struct thread *td); 408 void sigfastblock_fetch(struct thread *td); 409 int sig_intr(void); 410 void siginit(struct proc *p); 411 void signotify(struct thread *td); 412 void sigqueue_delete(struct sigqueue *queue, int sig); 413 void sigqueue_delete_proc(struct proc *p, int sig); 414 void sigqueue_flush(struct sigqueue *queue); 415 void sigqueue_init(struct sigqueue *queue, struct proc *p); 416 void sigqueue_take(ksiginfo_t *ksi); 417 void tdksignal(struct thread *td, int sig, ksiginfo_t *ksi); 418 int tdsendsignal(struct proc *p, struct thread *td, int sig, 419 ksiginfo_t *ksi); 420 void tdsigcleanup(struct thread *td); 421 void tdsignal(struct thread *td, int sig); 422 void trapsignal(struct thread *td, ksiginfo_t *ksi); 423 424 #endif /* _KERNEL */ 425 426 #endif /* !_SYS_SIGNALVAR_H_ */ 427