1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)signalvar.h 8.6 (Berkeley) 2/19/95 30 * $FreeBSD$ 31 */ 32 33 #ifndef _SYS_SIGNALVAR_H_ 34 #define _SYS_SIGNALVAR_H_ 35 36 #include <sys/queue.h> 37 #include <sys/_lock.h> 38 #include <sys/_mutex.h> 39 #include <sys/signal.h> 40 41 /* 42 * Kernel signal definitions and data structures. 43 */ 44 45 /* 46 * Logical process signal actions and state, needed only within the process 47 * The mapping between sigacts and proc structures is 1:1 except for rfork() 48 * processes masquerading as threads which use one structure for the whole 49 * group. All members are locked by the included mutex. The reference count 50 * and mutex must be last for the bcopy in sigacts_copy() to work. 51 */ 52 struct sigacts { 53 sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */ 54 sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */ 55 sigset_t ps_sigonstack; /* Signals to take on sigstack. */ 56 sigset_t ps_sigintr; /* Signals that interrupt syscalls. */ 57 sigset_t ps_sigreset; /* Signals that reset when caught. */ 58 sigset_t ps_signodefer; /* Signals not masked while handled. */ 59 sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */ 60 sigset_t ps_sigignore; /* Signals being ignored. */ 61 sigset_t ps_sigcatch; /* Signals being caught by user. */ 62 sigset_t ps_freebsd4; /* Signals using freebsd4 ucontext. */ 63 sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */ 64 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */ 65 int ps_flag; 66 u_int ps_refcnt; 67 struct mtx ps_mtx; 68 }; 69 70 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */ 71 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */ 72 #define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */ 73 74 #ifdef _KERNEL 75 76 #ifdef COMPAT_43 77 typedef struct { 78 struct osigcontext si_sc; 79 int si_signo; 80 int si_code; 81 union sigval si_value; 82 } osiginfo_t; 83 84 struct osigaction { 85 union { 86 void (*__sa_handler)(int); 87 void (*__sa_sigaction)(int, osiginfo_t *, void *); 88 } __sigaction_u; /* signal handler */ 89 osigset_t sa_mask; /* signal mask to apply */ 90 int sa_flags; /* see signal options below */ 91 }; 92 93 typedef void __osiginfohandler_t(int, osiginfo_t *, void *); 94 #endif /* COMPAT_43 */ 95 96 /* additional signal action values, used only temporarily/internally */ 97 #define SIG_CATCH ((__sighandler_t *)2) 98 /* #define SIG_HOLD ((__sighandler_t *)3) See signal.h */ 99 100 /* 101 * get signal action for process and signal; currently only for current process 102 */ 103 #define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 104 105 #endif /* _KERNEL */ 106 107 /* 108 * sigset_t manipulation macros. 109 */ 110 #define SIGADDSET(set, signo) \ 111 ((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)) 112 113 #define SIGDELSET(set, signo) \ 114 ((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)) 115 116 #define SIGEMPTYSET(set) \ 117 do { \ 118 int __i; \ 119 for (__i = 0; __i < _SIG_WORDS; __i++) \ 120 (set).__bits[__i] = 0; \ 121 } while (0) 122 123 #define SIGFILLSET(set) \ 124 do { \ 125 int __i; \ 126 for (__i = 0; __i < _SIG_WORDS; __i++) \ 127 (set).__bits[__i] = ~0U; \ 128 } while (0) 129 130 #define SIGISMEMBER(set, signo) \ 131 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) 132 133 #define SIGISEMPTY(set) (__sigisempty(&(set))) 134 #define SIGNOTEMPTY(set) (!__sigisempty(&(set))) 135 136 #define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2))) 137 #define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2))) 138 139 #define SIGSETOR(set1, set2) \ 140 do { \ 141 int __i; \ 142 for (__i = 0; __i < _SIG_WORDS; __i++) \ 143 (set1).__bits[__i] |= (set2).__bits[__i]; \ 144 } while (0) 145 146 #define SIGSETAND(set1, set2) \ 147 do { \ 148 int __i; \ 149 for (__i = 0; __i < _SIG_WORDS; __i++) \ 150 (set1).__bits[__i] &= (set2).__bits[__i]; \ 151 } while (0) 152 153 #define SIGSETNAND(set1, set2) \ 154 do { \ 155 int __i; \ 156 for (__i = 0; __i < _SIG_WORDS; __i++) \ 157 (set1).__bits[__i] &= ~(set2).__bits[__i]; \ 158 } while (0) 159 160 #define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0]) 161 #define SIGSETOLD(set, oset) ((set).__bits[0] = (oset)) 162 163 #define SIG_CANTMASK(set) \ 164 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP) 165 166 #define SIG_STOPSIGMASK(set) \ 167 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \ 168 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU) 169 170 #define SIG_CONTSIGMASK(set) \ 171 SIGDELSET(set, SIGCONT) 172 173 #define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP)) 174 175 #define SIG2OSIG(sig, osig) (osig = (sig).__bits[0]) 176 #define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig 177 178 static __inline int 179 __sigisempty(sigset_t *set) 180 { 181 int i; 182 183 for (i = 0; i < _SIG_WORDS; i++) { 184 if (set->__bits[i]) 185 return (0); 186 } 187 return (1); 188 } 189 190 static __inline int 191 __sigseteq(sigset_t *set1, sigset_t *set2) 192 { 193 int i; 194 195 for (i = 0; i < _SIG_WORDS; i++) { 196 if (set1->__bits[i] != set2->__bits[i]) 197 return (0); 198 } 199 return (1); 200 } 201 202 #ifdef COMPAT_FREEBSD6 203 struct osigevent { 204 int sigev_notify; /* Notification type */ 205 union { 206 int __sigev_signo; /* Signal number */ 207 int __sigev_notify_kqueue; 208 } __sigev_u; 209 union sigval sigev_value; /* Signal value */ 210 }; 211 #endif 212 213 typedef struct ksiginfo { 214 TAILQ_ENTRY(ksiginfo) ksi_link; 215 siginfo_t ksi_info; 216 int ksi_flags; 217 struct sigqueue *ksi_sigq; 218 } ksiginfo_t; 219 220 #define ksi_signo ksi_info.si_signo 221 #define ksi_errno ksi_info.si_errno 222 #define ksi_code ksi_info.si_code 223 #define ksi_pid ksi_info.si_pid 224 #define ksi_uid ksi_info.si_uid 225 #define ksi_status ksi_info.si_status 226 #define ksi_addr ksi_info.si_addr 227 #define ksi_value ksi_info.si_value 228 #define ksi_band ksi_info.si_band 229 #define ksi_trapno ksi_info.si_trapno 230 #define ksi_overrun ksi_info.si_overrun 231 #define ksi_timerid ksi_info.si_timerid 232 #define ksi_mqd ksi_info.si_mqd 233 234 /* bits for ksi_flags */ 235 #define KSI_TRAP 0x01 /* Generated by trap. */ 236 #define KSI_EXT 0x02 /* Externally managed ksi. */ 237 #define KSI_INS 0x04 /* Directly insert ksi, not the copy */ 238 #define KSI_SIGQ 0x08 /* Generated by sigqueue, might ret EGAIN. */ 239 #define KSI_HEAD 0x10 /* Insert into head, not tail. */ 240 #define KSI_COPYMASK (KSI_TRAP|KSI_SIGQ) 241 242 #define KSI_ONQ(ksi) ((ksi)->ksi_sigq != NULL) 243 244 typedef struct sigqueue { 245 sigset_t sq_signals; /* All pending signals. */ 246 sigset_t sq_kill; /* Legacy depth 1 queue. */ 247 TAILQ_HEAD(, ksiginfo) sq_list;/* Queued signal info. */ 248 struct proc *sq_proc; 249 int sq_flags; 250 } sigqueue_t; 251 252 /* Flags for ksi_flags */ 253 #define SQ_INIT 0x01 254 255 #ifdef _KERNEL 256 257 /* Return nonzero if process p has an unmasked pending signal. */ 258 #define SIGPENDING(td) \ 259 ((!SIGISEMPTY((td)->td_siglist) && \ 260 !sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask)) || \ 261 (!SIGISEMPTY((td)->td_proc->p_siglist) && \ 262 !sigsetmasked(&(td)->td_proc->p_siglist, &(td)->td_sigmask))) 263 /* 264 * Return the value of the pseudo-expression ((*set & ~*mask) != 0). This 265 * is an optimized version of SIGISEMPTY() on a temporary variable 266 * containing SIGSETNAND(*set, *mask). 267 */ 268 static __inline int 269 sigsetmasked(sigset_t *set, sigset_t *mask) 270 { 271 int i; 272 273 for (i = 0; i < _SIG_WORDS; i++) { 274 if (set->__bits[i] & ~mask->__bits[i]) 275 return (0); 276 } 277 return (1); 278 } 279 280 #define ksiginfo_init(ksi) \ 281 do { \ 282 bzero(ksi, sizeof(ksiginfo_t)); \ 283 } while(0) 284 285 #define ksiginfo_init_trap(ksi) \ 286 do { \ 287 ksiginfo_t *kp = ksi; \ 288 bzero(kp, sizeof(ksiginfo_t)); \ 289 kp->ksi_flags |= KSI_TRAP; \ 290 } while(0) 291 292 static __inline void 293 ksiginfo_copy(ksiginfo_t *src, ksiginfo_t *dst) 294 { 295 (dst)->ksi_info = src->ksi_info; 296 (dst)->ksi_flags = (src->ksi_flags & KSI_COPYMASK); 297 } 298 299 static __inline void 300 ksiginfo_set_sigev(ksiginfo_t *dst, struct sigevent *sigev) 301 { 302 dst->ksi_signo = sigev->sigev_signo; 303 dst->ksi_value = sigev->sigev_value; 304 } 305 306 struct pgrp; 307 struct proc; 308 struct sigio; 309 struct thread; 310 311 /* 312 * Lock the pointers for a sigio object in the underlying objects of 313 * a file descriptor. 314 */ 315 #define SIGIO_LOCK() mtx_lock(&sigio_lock) 316 #define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock) 317 #define SIGIO_UNLOCK() mtx_unlock(&sigio_lock) 318 #define SIGIO_LOCKED() mtx_owned(&sigio_lock) 319 #define SIGIO_ASSERT(type) mtx_assert(&sigio_lock, type) 320 321 extern struct mtx sigio_lock; 322 323 /* Flags for kern_sigprocmask(). */ 324 #define SIGPROCMASK_OLD 0x0001 325 #define SIGPROCMASK_PROC_LOCKED 0x0002 326 #define SIGPROCMASK_PS_LOCKED 0x0004 327 328 /* 329 * Modes for sigdeferstop(). Manages behaviour of 330 * thread_suspend_check() in the region delimited by 331 * sigdeferstop()/sigallowstop(). Must be restored to 332 * SIGDEFERSTOP_OFF before returning to userspace. 333 */ 334 #define SIGDEFERSTOP_NOP 0 /* continue doing whatever is done now */ 335 #define SIGDEFERSTOP_OFF 1 /* stop ignoring STOPs */ 336 #define SIGDEFERSTOP_SILENT 2 /* silently ignore STOPs */ 337 #define SIGDEFERSTOP_EINTR 3 /* ignore STOPs, return EINTR */ 338 #define SIGDEFERSTOP_ERESTART 4 /* ignore STOPs, return ERESTART */ 339 340 #define SIGDEFERSTOP_VAL_NCHG (-1) /* placeholder indicating no state change */ 341 int sigdeferstop_impl(int mode); 342 void sigallowstop_impl(int prev); 343 344 static inline int 345 sigdeferstop(int mode) 346 { 347 348 if (mode == SIGDEFERSTOP_NOP) 349 return (SIGDEFERSTOP_VAL_NCHG); 350 return (sigdeferstop_impl(mode)); 351 } 352 353 static inline void 354 sigallowstop(int prev) 355 { 356 357 if (prev == SIGDEFERSTOP_VAL_NCHG) 358 return; 359 sigallowstop_impl(prev); 360 } 361 362 int cursig(struct thread *td); 363 void execsigs(struct proc *p); 364 void gsignal(int pgid, int sig, ksiginfo_t *ksi); 365 void killproc(struct proc *p, char *why); 366 ksiginfo_t * ksiginfo_alloc(int wait); 367 void ksiginfo_free(ksiginfo_t *ksi); 368 int pksignal(struct proc *p, int sig, ksiginfo_t *ksi); 369 void pgsigio(struct sigio **sigiop, int sig, int checkctty); 370 void pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi); 371 int postsig(int sig); 372 void kern_psignal(struct proc *p, int sig); 373 int ptracestop(struct thread *td, int sig); 374 void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *retmask); 375 struct sigacts *sigacts_alloc(void); 376 void sigacts_copy(struct sigacts *dest, struct sigacts *src); 377 void sigacts_free(struct sigacts *ps); 378 struct sigacts *sigacts_hold(struct sigacts *ps); 379 int sigacts_shared(struct sigacts *ps); 380 void sigexit(struct thread *td, int sig) __dead2; 381 int sigev_findtd(struct proc *p, struct sigevent *sigev, struct thread **); 382 int sig_ffs(sigset_t *set); 383 void siginit(struct proc *p); 384 void signotify(struct thread *td); 385 void sigqueue_delete(struct sigqueue *queue, int sig); 386 void sigqueue_delete_proc(struct proc *p, int sig); 387 void sigqueue_flush(struct sigqueue *queue); 388 void sigqueue_init(struct sigqueue *queue, struct proc *p); 389 void sigqueue_take(ksiginfo_t *ksi); 390 void tdksignal(struct thread *td, int sig, ksiginfo_t *ksi); 391 int tdsendsignal(struct proc *p, struct thread *td, int sig, 392 ksiginfo_t *ksi); 393 void tdsigcleanup(struct thread *td); 394 void tdsignal(struct thread *td, int sig); 395 void trapsignal(struct thread *td, ksiginfo_t *ksi); 396 397 #endif /* _KERNEL */ 398 399 #endif /* !_SYS_SIGNALVAR_H_ */ 400