17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 534709573Sraf * Common Development and Distribution License (the "License"). 634709573Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 210293487cSraf 227c478bd9Sstevel@tonic-gate /* 2334709573Sraf * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 277c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate #include "lint.h" 307c478bd9Sstevel@tonic-gate #include "thr_uberdata.h" 31*f841f6adSraf #include "asyncio.h" 327c478bd9Sstevel@tonic-gate #include <signal.h> 337c478bd9Sstevel@tonic-gate #include <siginfo.h> 347c478bd9Sstevel@tonic-gate #include <ucontext.h> 357c478bd9Sstevel@tonic-gate #include <sys/systm.h> 367c478bd9Sstevel@tonic-gate 377c478bd9Sstevel@tonic-gate const sigset_t maskset = {MASKSET0, MASKSET1, 0, 0}; /* maskable signals */ 387c478bd9Sstevel@tonic-gate 397c478bd9Sstevel@tonic-gate /* 407c478bd9Sstevel@tonic-gate * Return true if the valid signal bits in both sets are the same. 417c478bd9Sstevel@tonic-gate */ 427c478bd9Sstevel@tonic-gate int 437c478bd9Sstevel@tonic-gate sigequalset(const sigset_t *s1, const sigset_t *s2) 447c478bd9Sstevel@tonic-gate { 457c478bd9Sstevel@tonic-gate /* 467c478bd9Sstevel@tonic-gate * We only test valid signal bits, not rubbish following MAXSIG 477c478bd9Sstevel@tonic-gate * (for speed). Algorithm: 487c478bd9Sstevel@tonic-gate * if (s1 & fillset) == (s2 & fillset) then (s1 ^ s2) & fillset == 0 497c478bd9Sstevel@tonic-gate */ 507c478bd9Sstevel@tonic-gate return (!((s1->__sigbits[0] ^ s2->__sigbits[0]) | 517c478bd9Sstevel@tonic-gate ((s1->__sigbits[1] ^ s2->__sigbits[1]) & FILLSET1))); 527c478bd9Sstevel@tonic-gate } 537c478bd9Sstevel@tonic-gate 547c478bd9Sstevel@tonic-gate /* 557c478bd9Sstevel@tonic-gate * Common code for calling the user-specified signal handler. 567c478bd9Sstevel@tonic-gate */ 577c478bd9Sstevel@tonic-gate void 587c478bd9Sstevel@tonic-gate call_user_handler(int sig, siginfo_t *sip, ucontext_t *ucp) 597c478bd9Sstevel@tonic-gate { 607c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 617c478bd9Sstevel@tonic-gate uberdata_t *udp = self->ul_uberdata; 627c478bd9Sstevel@tonic-gate struct sigaction uact; 637c478bd9Sstevel@tonic-gate volatile struct sigaction *sap; 647c478bd9Sstevel@tonic-gate 657c478bd9Sstevel@tonic-gate /* 667c478bd9Sstevel@tonic-gate * If we are taking a signal while parked or about to be parked 677c478bd9Sstevel@tonic-gate * on __lwp_park() then remove ourself from the sleep queue so 687c478bd9Sstevel@tonic-gate * that we can grab locks. The code in mutex_lock_queue() and 697c478bd9Sstevel@tonic-gate * cond_wait_common() will detect this and deal with it when 707c478bd9Sstevel@tonic-gate * __lwp_park() returns. 717c478bd9Sstevel@tonic-gate */ 727c478bd9Sstevel@tonic-gate unsleep_self(); 737c478bd9Sstevel@tonic-gate set_parking_flag(self, 0); 747c478bd9Sstevel@tonic-gate 757c478bd9Sstevel@tonic-gate if (__td_event_report(self, TD_CATCHSIG, udp)) { 767c478bd9Sstevel@tonic-gate self->ul_td_evbuf.eventnum = TD_CATCHSIG; 777c478bd9Sstevel@tonic-gate self->ul_td_evbuf.eventdata = (void *)(intptr_t)sig; 787c478bd9Sstevel@tonic-gate tdb_event(TD_CATCHSIG, udp); 797c478bd9Sstevel@tonic-gate } 807c478bd9Sstevel@tonic-gate 817c478bd9Sstevel@tonic-gate /* 827c478bd9Sstevel@tonic-gate * Get a self-consistent set of flags, handler, and mask 837c478bd9Sstevel@tonic-gate * while holding the sig's sig_lock for the least possible time. 847c478bd9Sstevel@tonic-gate * We must acquire the sig's sig_lock because some thread running 857c478bd9Sstevel@tonic-gate * in sigaction() might be establishing a new signal handler. 867c478bd9Sstevel@tonic-gate * 877c478bd9Sstevel@tonic-gate * Locking exceptions: 887c478bd9Sstevel@tonic-gate * No locking for a child of vfork(). 897c478bd9Sstevel@tonic-gate * If the signal is SIGPROF with an si_code of PROF_SIG, 907c478bd9Sstevel@tonic-gate * then we assume that this signal was generated by 917c478bd9Sstevel@tonic-gate * setitimer(ITIMER_REALPROF) set up by the dbx collector. 927c478bd9Sstevel@tonic-gate * If the signal is SIGEMT with an si_code of EMT_CPCOVF, 937c478bd9Sstevel@tonic-gate * then we assume that the signal was generated by 947c478bd9Sstevel@tonic-gate * a hardware performance counter overflow. 957c478bd9Sstevel@tonic-gate * In these cases, assume that we need no locking. It is the 967c478bd9Sstevel@tonic-gate * monitoring program's responsibility to ensure correctness. 977c478bd9Sstevel@tonic-gate */ 987c478bd9Sstevel@tonic-gate sap = &udp->siguaction[sig].sig_uaction; 997c478bd9Sstevel@tonic-gate if (self->ul_vfork || 1007c478bd9Sstevel@tonic-gate (sip != NULL && 1017c478bd9Sstevel@tonic-gate ((sig == SIGPROF && sip->si_code == PROF_SIG) || 1027c478bd9Sstevel@tonic-gate (sig == SIGEMT && sip->si_code == EMT_CPCOVF)))) { 1037c478bd9Sstevel@tonic-gate /* we wish this assignment could be atomic */ 1040293487cSraf (void) _private_memcpy(&uact, (void *)sap, sizeof (uact)); 1057c478bd9Sstevel@tonic-gate } else { 1067c478bd9Sstevel@tonic-gate mutex_t *mp = &udp->siguaction[sig].sig_lock; 1077c478bd9Sstevel@tonic-gate lmutex_lock(mp); 1080293487cSraf (void) _private_memcpy(&uact, (void *)sap, sizeof (uact)); 1097c478bd9Sstevel@tonic-gate if (sig == SIGCANCEL && (sap->sa_flags & SA_RESETHAND)) 1107c478bd9Sstevel@tonic-gate sap->sa_sigaction = SIG_DFL; 1117c478bd9Sstevel@tonic-gate lmutex_unlock(mp); 1127c478bd9Sstevel@tonic-gate } 1137c478bd9Sstevel@tonic-gate 1147c478bd9Sstevel@tonic-gate /* 1157c478bd9Sstevel@tonic-gate * Set the proper signal mask and call the user's signal handler. 1167c478bd9Sstevel@tonic-gate * (We overrode the user-requested signal mask with maskset 1177c478bd9Sstevel@tonic-gate * so we currently have all blockable signals blocked.) 1187c478bd9Sstevel@tonic-gate * 1197c478bd9Sstevel@tonic-gate * We would like to ASSERT() that the signal is not a member of the 1207c478bd9Sstevel@tonic-gate * signal mask at the previous level (ucp->uc_sigmask) or the specified 1217c478bd9Sstevel@tonic-gate * signal mask for sigsuspend() or pollsys() (self->ul_tmpmask) but 1227c478bd9Sstevel@tonic-gate * /proc can override this via PCSSIG, so we don't bother. 1237c478bd9Sstevel@tonic-gate * 1247c478bd9Sstevel@tonic-gate * We would also like to ASSERT() that the signal mask at the previous 1257c478bd9Sstevel@tonic-gate * level equals self->ul_sigmask (maskset for sigsuspend() / pollsys()), 1267c478bd9Sstevel@tonic-gate * but /proc can change the thread's signal mask via PCSHOLD, so we 1277c478bd9Sstevel@tonic-gate * don't bother with that either. 1287c478bd9Sstevel@tonic-gate */ 1297c478bd9Sstevel@tonic-gate ASSERT(ucp->uc_flags & UC_SIGMASK); 1307c478bd9Sstevel@tonic-gate if (self->ul_sigsuspend) { 1317c478bd9Sstevel@tonic-gate ucp->uc_sigmask = self->ul_sigmask; 1327c478bd9Sstevel@tonic-gate self->ul_sigsuspend = 0; 1337c478bd9Sstevel@tonic-gate /* the sigsuspend() or pollsys() signal mask */ 1347c478bd9Sstevel@tonic-gate sigorset(&uact.sa_mask, &self->ul_tmpmask); 1357c478bd9Sstevel@tonic-gate } else { 1367c478bd9Sstevel@tonic-gate /* the signal mask at the previous level */ 1377c478bd9Sstevel@tonic-gate sigorset(&uact.sa_mask, &ucp->uc_sigmask); 1387c478bd9Sstevel@tonic-gate } 1397c478bd9Sstevel@tonic-gate if (!(uact.sa_flags & SA_NODEFER)) /* add current signal */ 1407c478bd9Sstevel@tonic-gate (void) _private_sigaddset(&uact.sa_mask, sig); 1417c478bd9Sstevel@tonic-gate self->ul_sigmask = uact.sa_mask; 1427c478bd9Sstevel@tonic-gate self->ul_siglink = ucp; 1437c478bd9Sstevel@tonic-gate (void) __lwp_sigmask(SIG_SETMASK, &uact.sa_mask, NULL); 1447c478bd9Sstevel@tonic-gate 1457c478bd9Sstevel@tonic-gate /* 1467c478bd9Sstevel@tonic-gate * If this thread has been sent SIGCANCEL from the kernel 1477c478bd9Sstevel@tonic-gate * or from pthread_cancel(), it is being asked to exit. 1487c478bd9Sstevel@tonic-gate * The kernel may send SIGCANCEL without a siginfo struct. 1497c478bd9Sstevel@tonic-gate * If the SIGCANCEL is process-directed (from kill() or 1507c478bd9Sstevel@tonic-gate * sigqueue()), treat it as an ordinary signal. 1517c478bd9Sstevel@tonic-gate */ 1527c478bd9Sstevel@tonic-gate if (sig == SIGCANCEL) { 1537c478bd9Sstevel@tonic-gate if (sip == NULL || SI_FROMKERNEL(sip) || 1547c478bd9Sstevel@tonic-gate sip->si_code == SI_LWP) { 1557c478bd9Sstevel@tonic-gate do_sigcancel(); 1567c478bd9Sstevel@tonic-gate goto out; 1577c478bd9Sstevel@tonic-gate } 158*f841f6adSraf /* SIGCANCEL is ignored by default */ 159*f841f6adSraf if (uact.sa_sigaction == SIG_DFL || 160*f841f6adSraf uact.sa_sigaction == SIG_IGN) 161*f841f6adSraf goto out; 162*f841f6adSraf } 163*f841f6adSraf 164*f841f6adSraf /* 165*f841f6adSraf * If this thread has been sent SIGAIOCANCEL (SIGLWP) and 166*f841f6adSraf * we are an aio worker thread, cancel the aio request. 167*f841f6adSraf */ 168*f841f6adSraf if (sig == SIGAIOCANCEL) { 169*f841f6adSraf aio_worker_t *aiowp = _pthread_getspecific(_aio_key); 170*f841f6adSraf 171*f841f6adSraf if (sip != NULL && sip->si_code == SI_LWP && aiowp != NULL) 172*f841f6adSraf _siglongjmp(aiowp->work_jmp_buf, 1); 173*f841f6adSraf /* SIGLWP is ignored by default */ 1747c478bd9Sstevel@tonic-gate if (uact.sa_sigaction == SIG_DFL || 1757c478bd9Sstevel@tonic-gate uact.sa_sigaction == SIG_IGN) 1767c478bd9Sstevel@tonic-gate goto out; 1777c478bd9Sstevel@tonic-gate } 1787c478bd9Sstevel@tonic-gate 1797c478bd9Sstevel@tonic-gate if (!(uact.sa_flags & SA_SIGINFO)) 1807c478bd9Sstevel@tonic-gate sip = NULL; 1817c478bd9Sstevel@tonic-gate __sighndlr(sig, sip, ucp, uact.sa_sigaction); 1827c478bd9Sstevel@tonic-gate 1837c478bd9Sstevel@tonic-gate #if defined(sparc) || defined(__sparc) 1847c478bd9Sstevel@tonic-gate /* 1857c478bd9Sstevel@tonic-gate * If this is a floating point exception and the queue 1867c478bd9Sstevel@tonic-gate * is non-empty, pop the top entry from the queue. This 1877c478bd9Sstevel@tonic-gate * is to maintain expected behavior. 1887c478bd9Sstevel@tonic-gate */ 1897c478bd9Sstevel@tonic-gate if (sig == SIGFPE && ucp->uc_mcontext.fpregs.fpu_qcnt) { 1907c478bd9Sstevel@tonic-gate fpregset_t *fp = &ucp->uc_mcontext.fpregs; 1917c478bd9Sstevel@tonic-gate 1927c478bd9Sstevel@tonic-gate if (--fp->fpu_qcnt > 0) { 1937c478bd9Sstevel@tonic-gate unsigned char i; 1947c478bd9Sstevel@tonic-gate struct fq *fqp; 1957c478bd9Sstevel@tonic-gate 1967c478bd9Sstevel@tonic-gate fqp = fp->fpu_q; 1977c478bd9Sstevel@tonic-gate for (i = 0; i < fp->fpu_qcnt; i++) 1987c478bd9Sstevel@tonic-gate fqp[i] = fqp[i+1]; 1997c478bd9Sstevel@tonic-gate } 2007c478bd9Sstevel@tonic-gate } 2017c478bd9Sstevel@tonic-gate #endif /* sparc */ 2027c478bd9Sstevel@tonic-gate 2037c478bd9Sstevel@tonic-gate out: 2047c478bd9Sstevel@tonic-gate (void) _private_setcontext(ucp); 2057c478bd9Sstevel@tonic-gate thr_panic("call_user_handler(): _setcontext() returned"); 2067c478bd9Sstevel@tonic-gate } 2077c478bd9Sstevel@tonic-gate 2087c478bd9Sstevel@tonic-gate /* 2097c478bd9Sstevel@tonic-gate * take_deferred_signal() is called when ul_critical and ul_sigdefer become 2107c478bd9Sstevel@tonic-gate * zero and a deferred signal has been recorded on the current thread. 2117c478bd9Sstevel@tonic-gate * We are out of the critical region and are ready to take a signal. 2127c478bd9Sstevel@tonic-gate * The kernel has all signals blocked on this lwp, but our value of 2137c478bd9Sstevel@tonic-gate * ul_sigmask is the correct signal mask for the previous context. 2147c478bd9Sstevel@tonic-gate */ 2157c478bd9Sstevel@tonic-gate void 2167c478bd9Sstevel@tonic-gate take_deferred_signal(int sig) 2177c478bd9Sstevel@tonic-gate { 2187c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 2197c478bd9Sstevel@tonic-gate siginfo_t siginfo; 2207c478bd9Sstevel@tonic-gate siginfo_t *sip; 2217c478bd9Sstevel@tonic-gate ucontext_t uc; 2227c478bd9Sstevel@tonic-gate volatile int returning; 2237c478bd9Sstevel@tonic-gate 2247c478bd9Sstevel@tonic-gate ASSERT(self->ul_critical == 0); 2257c478bd9Sstevel@tonic-gate ASSERT(self->ul_sigdefer == 0); 2267c478bd9Sstevel@tonic-gate ASSERT(self->ul_cursig == 0); 2277c478bd9Sstevel@tonic-gate 2287c478bd9Sstevel@tonic-gate returning = 0; 2297c478bd9Sstevel@tonic-gate uc.uc_flags = UC_ALL; 2307c478bd9Sstevel@tonic-gate /* 2317c478bd9Sstevel@tonic-gate * We call _private_getcontext (a libc-private synonym for 2327c478bd9Sstevel@tonic-gate * _getcontext) rather than _getcontext because we need to 2337c478bd9Sstevel@tonic-gate * avoid the dynamic linker and link auditing problems here. 2347c478bd9Sstevel@tonic-gate */ 2357c478bd9Sstevel@tonic-gate (void) _private_getcontext(&uc); 2367c478bd9Sstevel@tonic-gate /* 2377c478bd9Sstevel@tonic-gate * If the application signal handler calls setcontext() on 2387c478bd9Sstevel@tonic-gate * the ucontext we give it, it returns here, then we return. 2397c478bd9Sstevel@tonic-gate */ 2407c478bd9Sstevel@tonic-gate if (returning) 2417c478bd9Sstevel@tonic-gate return; 2427c478bd9Sstevel@tonic-gate returning = 1; 2437c478bd9Sstevel@tonic-gate ASSERT(sigequalset(&uc.uc_sigmask, &maskset)); 2447c478bd9Sstevel@tonic-gate if (self->ul_siginfo.si_signo == 0) 2457c478bd9Sstevel@tonic-gate sip = NULL; 2467c478bd9Sstevel@tonic-gate else { 2470293487cSraf (void) _private_memcpy(&siginfo, 2480293487cSraf &self->ul_siginfo, sizeof (siginfo)); 2497c478bd9Sstevel@tonic-gate sip = &siginfo; 2507c478bd9Sstevel@tonic-gate } 2517c478bd9Sstevel@tonic-gate uc.uc_sigmask = self->ul_sigmask; 2527c478bd9Sstevel@tonic-gate call_user_handler(sig, sip, &uc); 2537c478bd9Sstevel@tonic-gate } 2547c478bd9Sstevel@tonic-gate 2557c478bd9Sstevel@tonic-gate void 2567c478bd9Sstevel@tonic-gate sigacthandler(int sig, siginfo_t *sip, void *uvp) 2577c478bd9Sstevel@tonic-gate { 2587c478bd9Sstevel@tonic-gate ucontext_t *ucp = uvp; 2597c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 2607c478bd9Sstevel@tonic-gate 2617c478bd9Sstevel@tonic-gate /* 2627c478bd9Sstevel@tonic-gate * Do this in case we took a signal while in a cancelable system call. 2637c478bd9Sstevel@tonic-gate * It does no harm if we were not in such a system call. 2647c478bd9Sstevel@tonic-gate */ 2657c478bd9Sstevel@tonic-gate self->ul_sp = 0; 2667c478bd9Sstevel@tonic-gate if (sig != SIGCANCEL) 2677c478bd9Sstevel@tonic-gate self->ul_cancel_async = self->ul_save_async; 2687c478bd9Sstevel@tonic-gate 2697c478bd9Sstevel@tonic-gate /* 2707c478bd9Sstevel@tonic-gate * If we are not in a critical region and are 2717c478bd9Sstevel@tonic-gate * not deferring signals, take the signal now. 2727c478bd9Sstevel@tonic-gate */ 2737c478bd9Sstevel@tonic-gate if ((self->ul_critical + self->ul_sigdefer) == 0) { 2747c478bd9Sstevel@tonic-gate call_user_handler(sig, sip, ucp); 2757c478bd9Sstevel@tonic-gate return; /* call_user_handler() cannot return */ 2767c478bd9Sstevel@tonic-gate } 2777c478bd9Sstevel@tonic-gate 2787c478bd9Sstevel@tonic-gate /* 2797c478bd9Sstevel@tonic-gate * We are in a critical region or we are deferring signals. When 2807c478bd9Sstevel@tonic-gate * we emerge from the region we will call take_deferred_signal(). 2817c478bd9Sstevel@tonic-gate */ 2827c478bd9Sstevel@tonic-gate ASSERT(self->ul_cursig == 0); 2837c478bd9Sstevel@tonic-gate self->ul_cursig = (char)sig; 2847c478bd9Sstevel@tonic-gate if (sip != NULL) 2850293487cSraf (void) _private_memcpy(&self->ul_siginfo, 2860293487cSraf sip, sizeof (siginfo_t)); 2877c478bd9Sstevel@tonic-gate else 2887c478bd9Sstevel@tonic-gate self->ul_siginfo.si_signo = 0; 2897c478bd9Sstevel@tonic-gate 2907c478bd9Sstevel@tonic-gate /* 2917c478bd9Sstevel@tonic-gate * Make sure that if we return to a call to __lwp_park() 2927c478bd9Sstevel@tonic-gate * or ___lwp_cond_wait() that it returns right away 2937c478bd9Sstevel@tonic-gate * (giving us a spurious wakeup but not a deadlock). 2947c478bd9Sstevel@tonic-gate */ 2957c478bd9Sstevel@tonic-gate set_parking_flag(self, 0); 2967c478bd9Sstevel@tonic-gate 2977c478bd9Sstevel@tonic-gate /* 2987c478bd9Sstevel@tonic-gate * Return to the previous context with all signals blocked. 2997c478bd9Sstevel@tonic-gate * We will restore the signal mask in take_deferred_signal(). 3007c478bd9Sstevel@tonic-gate * Note that we are calling the system call trap here, not 3017c478bd9Sstevel@tonic-gate * the _setcontext() wrapper. We don't want to change the 3027c478bd9Sstevel@tonic-gate * thread's ul_sigmask by this operation. 3037c478bd9Sstevel@tonic-gate */ 3047c478bd9Sstevel@tonic-gate ucp->uc_sigmask = maskset; 3057c478bd9Sstevel@tonic-gate (void) __setcontext_syscall(ucp); 3067c478bd9Sstevel@tonic-gate thr_panic("sigacthandler(): __setcontext() returned"); 3077c478bd9Sstevel@tonic-gate } 3087c478bd9Sstevel@tonic-gate 309*f841f6adSraf #pragma weak sigaction = _sigaction 3107c478bd9Sstevel@tonic-gate int 311*f841f6adSraf _sigaction(int sig, const struct sigaction *nact, struct sigaction *oact) 3127c478bd9Sstevel@tonic-gate { 3137c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 3147c478bd9Sstevel@tonic-gate uberdata_t *udp = self->ul_uberdata; 3157c478bd9Sstevel@tonic-gate struct sigaction oaction; 3167c478bd9Sstevel@tonic-gate struct sigaction tact; 3177c478bd9Sstevel@tonic-gate struct sigaction *tactp = NULL; 3187c478bd9Sstevel@tonic-gate int rv; 3197c478bd9Sstevel@tonic-gate 3207c478bd9Sstevel@tonic-gate if (sig <= 0 || sig >= NSIG) { 3217c478bd9Sstevel@tonic-gate errno = EINVAL; 3227c478bd9Sstevel@tonic-gate return (-1); 3237c478bd9Sstevel@tonic-gate } 3247c478bd9Sstevel@tonic-gate 3257c478bd9Sstevel@tonic-gate if (!self->ul_vfork) 3267c478bd9Sstevel@tonic-gate lmutex_lock(&udp->siguaction[sig].sig_lock); 3277c478bd9Sstevel@tonic-gate 3287c478bd9Sstevel@tonic-gate oaction = udp->siguaction[sig].sig_uaction; 3297c478bd9Sstevel@tonic-gate 3307c478bd9Sstevel@tonic-gate if (nact != NULL) { 3317c478bd9Sstevel@tonic-gate tact = *nact; /* make a copy so we can modify it */ 3327c478bd9Sstevel@tonic-gate tactp = &tact; 3337c478bd9Sstevel@tonic-gate delete_reserved_signals(&tact.sa_mask); 3347c478bd9Sstevel@tonic-gate 3357c478bd9Sstevel@tonic-gate #if !defined(_LP64) 3367c478bd9Sstevel@tonic-gate tact.sa_resv[0] = tact.sa_resv[1] = 0; /* cleanliness */ 3377c478bd9Sstevel@tonic-gate #endif 3387c478bd9Sstevel@tonic-gate /* 3397c478bd9Sstevel@tonic-gate * To be compatible with the behavior of SunOS 4.x: 3407c478bd9Sstevel@tonic-gate * If the new signal handler is SIG_IGN or SIG_DFL, do 3417c478bd9Sstevel@tonic-gate * not change the signal's entry in the siguaction array. 3427c478bd9Sstevel@tonic-gate * This allows a child of vfork(2) to set signal handlers 3437c478bd9Sstevel@tonic-gate * to SIG_IGN or SIG_DFL without affecting the parent. 3447c478bd9Sstevel@tonic-gate * 3457c478bd9Sstevel@tonic-gate * This also covers a race condition with some thread 3467c478bd9Sstevel@tonic-gate * setting the signal action to SIG_DFL or SIG_IGN 3477c478bd9Sstevel@tonic-gate * when the thread has also received and deferred 3487c478bd9Sstevel@tonic-gate * that signal. When the thread takes the deferred 3497c478bd9Sstevel@tonic-gate * signal, even though it has set the action to SIG_DFL 3507c478bd9Sstevel@tonic-gate * or SIG_IGN, it will execute the old signal handler 3517c478bd9Sstevel@tonic-gate * anyway. This is an inherent signaling race condition 3527c478bd9Sstevel@tonic-gate * and is not a bug. 3537c478bd9Sstevel@tonic-gate * 3547c478bd9Sstevel@tonic-gate * A child of vfork() is not allowed to change signal 3557c478bd9Sstevel@tonic-gate * handlers to anything other than SIG_DFL or SIG_IGN. 3567c478bd9Sstevel@tonic-gate */ 3577c478bd9Sstevel@tonic-gate if (self->ul_vfork) { 3587c478bd9Sstevel@tonic-gate if (tact.sa_sigaction != SIG_IGN) 3597c478bd9Sstevel@tonic-gate tact.sa_sigaction = SIG_DFL; 360*f841f6adSraf } else if (sig == SIGCANCEL || sig == SIGAIOCANCEL) { 3617c478bd9Sstevel@tonic-gate /* 362*f841f6adSraf * Always catch these signals. 363*f841f6adSraf * We need SIGCANCEL for pthread_cancel() to work. 364*f841f6adSraf * We need SIGAIOCANCEL for aio_cancel() to work. 3657c478bd9Sstevel@tonic-gate */ 3667c478bd9Sstevel@tonic-gate udp->siguaction[sig].sig_uaction = tact; 3677c478bd9Sstevel@tonic-gate if (tact.sa_sigaction == SIG_DFL || 3687c478bd9Sstevel@tonic-gate tact.sa_sigaction == SIG_IGN) 3697c478bd9Sstevel@tonic-gate tact.sa_flags = SA_SIGINFO; 3707c478bd9Sstevel@tonic-gate else { 3717c478bd9Sstevel@tonic-gate tact.sa_flags |= SA_SIGINFO; 3727c478bd9Sstevel@tonic-gate tact.sa_flags &= ~(SA_NODEFER | SA_RESETHAND); 3737c478bd9Sstevel@tonic-gate } 3747c478bd9Sstevel@tonic-gate tact.sa_sigaction = udp->sigacthandler; 3757c478bd9Sstevel@tonic-gate tact.sa_mask = maskset; 3767c478bd9Sstevel@tonic-gate } else if (tact.sa_sigaction != SIG_DFL && 3777c478bd9Sstevel@tonic-gate tact.sa_sigaction != SIG_IGN) { 3787c478bd9Sstevel@tonic-gate udp->siguaction[sig].sig_uaction = tact; 3797c478bd9Sstevel@tonic-gate tact.sa_flags &= ~SA_NODEFER; 3807c478bd9Sstevel@tonic-gate tact.sa_sigaction = udp->sigacthandler; 3817c478bd9Sstevel@tonic-gate tact.sa_mask = maskset; 3827c478bd9Sstevel@tonic-gate } 3837c478bd9Sstevel@tonic-gate } 3847c478bd9Sstevel@tonic-gate 3857c478bd9Sstevel@tonic-gate if ((rv = __sigaction(sig, tactp, oact)) != 0) 3867c478bd9Sstevel@tonic-gate udp->siguaction[sig].sig_uaction = oaction; 3877c478bd9Sstevel@tonic-gate else if (oact != NULL && 3887c478bd9Sstevel@tonic-gate oact->sa_sigaction != SIG_DFL && 3897c478bd9Sstevel@tonic-gate oact->sa_sigaction != SIG_IGN) 3907c478bd9Sstevel@tonic-gate *oact = oaction; 3917c478bd9Sstevel@tonic-gate 392*f841f6adSraf /* 393*f841f6adSraf * We detect setting the disposition of SIGIO just to set the 394*f841f6adSraf * _sigio_enabled flag for the asynchronous i/o (aio) code. 395*f841f6adSraf */ 396*f841f6adSraf if (sig == SIGIO && rv == 0 && tactp != NULL) { 397*f841f6adSraf _sigio_enabled = 398*f841f6adSraf (tactp->sa_handler != SIG_DFL && 399*f841f6adSraf tactp->sa_handler != SIG_IGN); 400*f841f6adSraf } 401*f841f6adSraf 4027c478bd9Sstevel@tonic-gate if (!self->ul_vfork) 4037c478bd9Sstevel@tonic-gate lmutex_unlock(&udp->siguaction[sig].sig_lock); 4047c478bd9Sstevel@tonic-gate return (rv); 4057c478bd9Sstevel@tonic-gate } 4067c478bd9Sstevel@tonic-gate 4077c478bd9Sstevel@tonic-gate /* 4087c478bd9Sstevel@tonic-gate * Calling set_parking_flag(curthread, 1) informs the kernel that we are 4097c478bd9Sstevel@tonic-gate * calling __lwp_park or ___lwp_cond_wait(). If we take a signal in 4107c478bd9Sstevel@tonic-gate * the unprotected (from signals) interval before reaching the kernel, 4117c478bd9Sstevel@tonic-gate * sigacthandler() will call set_parking_flag(curthread, 0) to inform 4127c478bd9Sstevel@tonic-gate * the kernel to return immediately from these system calls, giving us 4137c478bd9Sstevel@tonic-gate * a spurious wakeup but not a deadlock. 4147c478bd9Sstevel@tonic-gate */ 4157c478bd9Sstevel@tonic-gate void 4167c478bd9Sstevel@tonic-gate set_parking_flag(ulwp_t *self, int park) 4177c478bd9Sstevel@tonic-gate { 4187c478bd9Sstevel@tonic-gate volatile sc_shared_t *scp; 4197c478bd9Sstevel@tonic-gate 4207c478bd9Sstevel@tonic-gate enter_critical(self); 4217c478bd9Sstevel@tonic-gate if ((scp = self->ul_schedctl) != NULL || 4227c478bd9Sstevel@tonic-gate (scp = setup_schedctl()) != NULL) 4237c478bd9Sstevel@tonic-gate scp->sc_park = park; 4247c478bd9Sstevel@tonic-gate else if (park == 0) /* schedctl failed, do it the long way */ 4257c478bd9Sstevel@tonic-gate __lwp_unpark(self->ul_lwpid); 4267c478bd9Sstevel@tonic-gate exit_critical(self); 4277c478bd9Sstevel@tonic-gate } 4287c478bd9Sstevel@tonic-gate 4297c478bd9Sstevel@tonic-gate /* 4307c478bd9Sstevel@tonic-gate * Tell the kernel to block all signals. 4317c478bd9Sstevel@tonic-gate * Use the schedctl interface, or failing that, use __lwp_sigmask(). 4327c478bd9Sstevel@tonic-gate * This action can be rescinded only by making a system call that 4337c478bd9Sstevel@tonic-gate * sets the signal mask: 4347c478bd9Sstevel@tonic-gate * __lwp_sigmask(), __sigprocmask(), __setcontext(), 4357c478bd9Sstevel@tonic-gate * __sigsuspend() or __pollsys(). 4367c478bd9Sstevel@tonic-gate * In particular, this action cannot be reversed by assigning 4377c478bd9Sstevel@tonic-gate * scp->sc_sigblock = 0. That would be a way to lose signals. 4387c478bd9Sstevel@tonic-gate * See the definition of restore_signals(self). 4397c478bd9Sstevel@tonic-gate */ 4407c478bd9Sstevel@tonic-gate void 4417c478bd9Sstevel@tonic-gate block_all_signals(ulwp_t *self) 4427c478bd9Sstevel@tonic-gate { 4437c478bd9Sstevel@tonic-gate volatile sc_shared_t *scp; 4447c478bd9Sstevel@tonic-gate 4457c478bd9Sstevel@tonic-gate enter_critical(self); 4467c478bd9Sstevel@tonic-gate if ((scp = self->ul_schedctl) != NULL || 4477c478bd9Sstevel@tonic-gate (scp = setup_schedctl()) != NULL) 4487c478bd9Sstevel@tonic-gate scp->sc_sigblock = 1; 4497c478bd9Sstevel@tonic-gate else 4507c478bd9Sstevel@tonic-gate (void) __lwp_sigmask(SIG_SETMASK, &maskset, NULL); 4517c478bd9Sstevel@tonic-gate exit_critical(self); 4527c478bd9Sstevel@tonic-gate } 4537c478bd9Sstevel@tonic-gate 4547c478bd9Sstevel@tonic-gate #pragma weak setcontext = _private_setcontext 4557c478bd9Sstevel@tonic-gate #pragma weak _setcontext = _private_setcontext 4567c478bd9Sstevel@tonic-gate int 4577c478bd9Sstevel@tonic-gate _private_setcontext(const ucontext_t *ucp) 4587c478bd9Sstevel@tonic-gate { 4597c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 4607c478bd9Sstevel@tonic-gate int ret; 4617c478bd9Sstevel@tonic-gate ucontext_t uc; 4627c478bd9Sstevel@tonic-gate 4637c478bd9Sstevel@tonic-gate /* 4647c478bd9Sstevel@tonic-gate * Returning from the main context (uc_link == NULL) causes 4657c478bd9Sstevel@tonic-gate * the thread to exit. See setcontext(2) and makecontext(3C). 4667c478bd9Sstevel@tonic-gate */ 4677c478bd9Sstevel@tonic-gate if (ucp == NULL) 4687c478bd9Sstevel@tonic-gate _thr_exit(NULL); 4690293487cSraf (void) _private_memcpy(&uc, ucp, sizeof (uc)); 4707c478bd9Sstevel@tonic-gate 4717c478bd9Sstevel@tonic-gate /* 4727c478bd9Sstevel@tonic-gate * Restore previous signal mask and context link. 4737c478bd9Sstevel@tonic-gate */ 4747c478bd9Sstevel@tonic-gate if (uc.uc_flags & UC_SIGMASK) { 4757c478bd9Sstevel@tonic-gate block_all_signals(self); 4767c478bd9Sstevel@tonic-gate delete_reserved_signals(&uc.uc_sigmask); 4777c478bd9Sstevel@tonic-gate self->ul_sigmask = uc.uc_sigmask; 4787c478bd9Sstevel@tonic-gate if (self->ul_cursig) { 4797c478bd9Sstevel@tonic-gate /* 4807c478bd9Sstevel@tonic-gate * We have a deferred signal present. 4817c478bd9Sstevel@tonic-gate * The signal mask will be set when the 4827c478bd9Sstevel@tonic-gate * signal is taken in take_deferred_signal(). 4837c478bd9Sstevel@tonic-gate */ 4847c478bd9Sstevel@tonic-gate ASSERT(self->ul_critical + self->ul_sigdefer != 0); 4857c478bd9Sstevel@tonic-gate uc.uc_flags &= ~UC_SIGMASK; 4867c478bd9Sstevel@tonic-gate } 4877c478bd9Sstevel@tonic-gate } 4887c478bd9Sstevel@tonic-gate self->ul_siglink = uc.uc_link; 4897c478bd9Sstevel@tonic-gate 4907c478bd9Sstevel@tonic-gate /* 4917c478bd9Sstevel@tonic-gate * We don't know where this context structure has been. 4927c478bd9Sstevel@tonic-gate * Preserve the curthread pointer, at least. 4937c478bd9Sstevel@tonic-gate */ 4947c478bd9Sstevel@tonic-gate #if defined(__sparc) 4957c478bd9Sstevel@tonic-gate uc.uc_mcontext.gregs[REG_G7] = (greg_t)self; 4967c478bd9Sstevel@tonic-gate #elif defined(__amd64) 4977c478bd9Sstevel@tonic-gate uc.uc_mcontext.gregs[REG_FS] = (greg_t)self->ul_gs; 4987c478bd9Sstevel@tonic-gate #elif defined(__i386) 4997c478bd9Sstevel@tonic-gate uc.uc_mcontext.gregs[GS] = (greg_t)self->ul_gs; 5007c478bd9Sstevel@tonic-gate #else 5017c478bd9Sstevel@tonic-gate #error "none of __sparc, __amd64, __i386 defined" 5027c478bd9Sstevel@tonic-gate #endif 5037c478bd9Sstevel@tonic-gate /* 5047c478bd9Sstevel@tonic-gate * Make sure that if we return to a call to __lwp_park() 5057c478bd9Sstevel@tonic-gate * or ___lwp_cond_wait() that it returns right away 5067c478bd9Sstevel@tonic-gate * (giving us a spurious wakeup but not a deadlock). 5077c478bd9Sstevel@tonic-gate */ 5087c478bd9Sstevel@tonic-gate set_parking_flag(self, 0); 5097c478bd9Sstevel@tonic-gate self->ul_sp = 0; 5107c478bd9Sstevel@tonic-gate ret = __setcontext_syscall(&uc); 5117c478bd9Sstevel@tonic-gate 5127c478bd9Sstevel@tonic-gate /* 5137c478bd9Sstevel@tonic-gate * It is OK for setcontext() to return if the user has not specified 5147c478bd9Sstevel@tonic-gate * UC_CPU. 5157c478bd9Sstevel@tonic-gate */ 5167c478bd9Sstevel@tonic-gate if (uc.uc_flags & UC_CPU) 5177c478bd9Sstevel@tonic-gate thr_panic("setcontext(): __setcontext() returned"); 5187c478bd9Sstevel@tonic-gate return (ret); 5197c478bd9Sstevel@tonic-gate } 5207c478bd9Sstevel@tonic-gate 5217c478bd9Sstevel@tonic-gate #pragma weak thr_sigsetmask = _thr_sigsetmask 5227c478bd9Sstevel@tonic-gate #pragma weak pthread_sigmask = _thr_sigsetmask 5237c478bd9Sstevel@tonic-gate #pragma weak _pthread_sigmask = _thr_sigsetmask 5247c478bd9Sstevel@tonic-gate int 5257c478bd9Sstevel@tonic-gate _thr_sigsetmask(int how, const sigset_t *set, sigset_t *oset) 5267c478bd9Sstevel@tonic-gate { 5277c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 5287c478bd9Sstevel@tonic-gate sigset_t saveset; 5297c478bd9Sstevel@tonic-gate 5307c478bd9Sstevel@tonic-gate if (set == NULL) { 5317c478bd9Sstevel@tonic-gate enter_critical(self); 5327c478bd9Sstevel@tonic-gate if (oset != NULL) 5337c478bd9Sstevel@tonic-gate *oset = self->ul_sigmask; 5347c478bd9Sstevel@tonic-gate exit_critical(self); 5357c478bd9Sstevel@tonic-gate } else { 5367c478bd9Sstevel@tonic-gate switch (how) { 5377c478bd9Sstevel@tonic-gate case SIG_BLOCK: 5387c478bd9Sstevel@tonic-gate case SIG_UNBLOCK: 5397c478bd9Sstevel@tonic-gate case SIG_SETMASK: 5407c478bd9Sstevel@tonic-gate break; 5417c478bd9Sstevel@tonic-gate default: 5427c478bd9Sstevel@tonic-gate return (EINVAL); 5437c478bd9Sstevel@tonic-gate } 5447c478bd9Sstevel@tonic-gate 5457c478bd9Sstevel@tonic-gate /* 5467c478bd9Sstevel@tonic-gate * The assignments to self->ul_sigmask must be protected from 5477c478bd9Sstevel@tonic-gate * signals. The nuances of this code are subtle. Be careful. 5487c478bd9Sstevel@tonic-gate */ 5497c478bd9Sstevel@tonic-gate block_all_signals(self); 5507c478bd9Sstevel@tonic-gate if (oset != NULL) 5517c478bd9Sstevel@tonic-gate saveset = self->ul_sigmask; 5527c478bd9Sstevel@tonic-gate switch (how) { 5537c478bd9Sstevel@tonic-gate case SIG_BLOCK: 5547c478bd9Sstevel@tonic-gate self->ul_sigmask.__sigbits[0] |= set->__sigbits[0]; 5557c478bd9Sstevel@tonic-gate self->ul_sigmask.__sigbits[1] |= set->__sigbits[1]; 5567c478bd9Sstevel@tonic-gate break; 5577c478bd9Sstevel@tonic-gate case SIG_UNBLOCK: 5587c478bd9Sstevel@tonic-gate self->ul_sigmask.__sigbits[0] &= ~set->__sigbits[0]; 5597c478bd9Sstevel@tonic-gate self->ul_sigmask.__sigbits[1] &= ~set->__sigbits[1]; 5607c478bd9Sstevel@tonic-gate break; 5617c478bd9Sstevel@tonic-gate case SIG_SETMASK: 5627c478bd9Sstevel@tonic-gate self->ul_sigmask.__sigbits[0] = set->__sigbits[0]; 5637c478bd9Sstevel@tonic-gate self->ul_sigmask.__sigbits[1] = set->__sigbits[1]; 5647c478bd9Sstevel@tonic-gate break; 5657c478bd9Sstevel@tonic-gate } 5667c478bd9Sstevel@tonic-gate delete_reserved_signals(&self->ul_sigmask); 5677c478bd9Sstevel@tonic-gate if (oset != NULL) 5687c478bd9Sstevel@tonic-gate *oset = saveset; 5697c478bd9Sstevel@tonic-gate restore_signals(self); 5707c478bd9Sstevel@tonic-gate } 5717c478bd9Sstevel@tonic-gate 5727c478bd9Sstevel@tonic-gate return (0); 5737c478bd9Sstevel@tonic-gate } 5747c478bd9Sstevel@tonic-gate 5757c478bd9Sstevel@tonic-gate #pragma weak sigprocmask = _sigprocmask 5767c478bd9Sstevel@tonic-gate int 5777c478bd9Sstevel@tonic-gate _sigprocmask(int how, const sigset_t *set, sigset_t *oset) 5787c478bd9Sstevel@tonic-gate { 5797c478bd9Sstevel@tonic-gate int error; 5807c478bd9Sstevel@tonic-gate 5817c478bd9Sstevel@tonic-gate /* 5827c478bd9Sstevel@tonic-gate * Guard against children of vfork(). 5837c478bd9Sstevel@tonic-gate */ 5847c478bd9Sstevel@tonic-gate if (curthread->ul_vfork) 5857c478bd9Sstevel@tonic-gate return (__lwp_sigmask(how, set, oset)); 5867c478bd9Sstevel@tonic-gate 5877c478bd9Sstevel@tonic-gate if ((error = _thr_sigsetmask(how, set, oset)) != 0) { 5887c478bd9Sstevel@tonic-gate errno = error; 5897c478bd9Sstevel@tonic-gate return (-1); 5907c478bd9Sstevel@tonic-gate } 5917c478bd9Sstevel@tonic-gate 5927c478bd9Sstevel@tonic-gate return (0); 5937c478bd9Sstevel@tonic-gate } 5947c478bd9Sstevel@tonic-gate 5957c478bd9Sstevel@tonic-gate /* 5967c478bd9Sstevel@tonic-gate * Called at library initialization to set up signal handling. 5977c478bd9Sstevel@tonic-gate * All we really do is initialize the sig_lock mutexes. 5987c478bd9Sstevel@tonic-gate * All signal handlers are either SIG_DFL or SIG_IGN on exec(). 5997c478bd9Sstevel@tonic-gate * However, if any signal handlers were established on alternate 6007c478bd9Sstevel@tonic-gate * link maps before the primary link map has been initialized, 6017c478bd9Sstevel@tonic-gate * then inform the kernel of the new sigacthandler. 6027c478bd9Sstevel@tonic-gate */ 6037c478bd9Sstevel@tonic-gate void 6047c478bd9Sstevel@tonic-gate signal_init() 6057c478bd9Sstevel@tonic-gate { 6067c478bd9Sstevel@tonic-gate uberdata_t *udp = curthread->ul_uberdata; 6077c478bd9Sstevel@tonic-gate struct sigaction *sap; 6087c478bd9Sstevel@tonic-gate struct sigaction act; 6097c478bd9Sstevel@tonic-gate int sig; 6107c478bd9Sstevel@tonic-gate 6117c478bd9Sstevel@tonic-gate for (sig = 0; sig < NSIG; sig++) { 6127c478bd9Sstevel@tonic-gate udp->siguaction[sig].sig_lock.mutex_magic = MUTEX_MAGIC; 6137c478bd9Sstevel@tonic-gate sap = &udp->siguaction[sig].sig_uaction; 6147c478bd9Sstevel@tonic-gate if (sap->sa_sigaction != SIG_DFL && 6157c478bd9Sstevel@tonic-gate sap->sa_sigaction != SIG_IGN && 6167c478bd9Sstevel@tonic-gate __sigaction(sig, NULL, &act) == 0 && 6177c478bd9Sstevel@tonic-gate act.sa_sigaction != SIG_DFL && 6187c478bd9Sstevel@tonic-gate act.sa_sigaction != SIG_IGN) { 6197c478bd9Sstevel@tonic-gate act = *sap; 6207c478bd9Sstevel@tonic-gate act.sa_flags &= ~SA_NODEFER; 6217c478bd9Sstevel@tonic-gate act.sa_sigaction = udp->sigacthandler; 6227c478bd9Sstevel@tonic-gate act.sa_mask = maskset; 6237c478bd9Sstevel@tonic-gate (void) __sigaction(sig, &act, NULL); 6247c478bd9Sstevel@tonic-gate } 6257c478bd9Sstevel@tonic-gate } 6267c478bd9Sstevel@tonic-gate } 6277c478bd9Sstevel@tonic-gate 6287c478bd9Sstevel@tonic-gate /* 6297c478bd9Sstevel@tonic-gate * Common code for cancelling self in _sigcancel() and pthread_cancel(). 6307c478bd9Sstevel@tonic-gate * If the thread is at a cancellation point (ul_cancelable) then just 6317c478bd9Sstevel@tonic-gate * return and let _canceloff() do the exit, else exit immediately if 6327c478bd9Sstevel@tonic-gate * async mode is in effect. 6337c478bd9Sstevel@tonic-gate */ 6347c478bd9Sstevel@tonic-gate void 6357c478bd9Sstevel@tonic-gate do_sigcancel() 6367c478bd9Sstevel@tonic-gate { 6377c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 6387c478bd9Sstevel@tonic-gate 6397c478bd9Sstevel@tonic-gate ASSERT(self->ul_critical == 0); 6407c478bd9Sstevel@tonic-gate ASSERT(self->ul_sigdefer == 0); 6417c478bd9Sstevel@tonic-gate self->ul_cancel_pending = 1; 6427c478bd9Sstevel@tonic-gate if (self->ul_cancel_async && 6437c478bd9Sstevel@tonic-gate !self->ul_cancel_disabled && 6447c478bd9Sstevel@tonic-gate !self->ul_cancelable) 6457c478bd9Sstevel@tonic-gate _pthread_exit(PTHREAD_CANCELED); 6467c478bd9Sstevel@tonic-gate } 6477c478bd9Sstevel@tonic-gate 6487c478bd9Sstevel@tonic-gate /* 649*f841f6adSraf * Set up the SIGCANCEL handler for threads cancellation, 650*f841f6adSraf * needed only when we have more than one thread, 651*f841f6adSraf * or the SIGAIOCANCEL handler for aio cancellation, 652*f841f6adSraf * called when aio is initialized, in __uaio_init(). 6537c478bd9Sstevel@tonic-gate */ 6547c478bd9Sstevel@tonic-gate void 655*f841f6adSraf setup_cancelsig(int sig) 6567c478bd9Sstevel@tonic-gate { 6577c478bd9Sstevel@tonic-gate uberdata_t *udp = curthread->ul_uberdata; 658*f841f6adSraf mutex_t *mp = &udp->siguaction[sig].sig_lock; 6597c478bd9Sstevel@tonic-gate struct sigaction act; 6607c478bd9Sstevel@tonic-gate 661*f841f6adSraf ASSERT(sig == SIGCANCEL || sig == SIGAIOCANCEL); 662*f841f6adSraf lmutex_lock(mp); 663*f841f6adSraf act = udp->siguaction[sig].sig_uaction; 664*f841f6adSraf lmutex_unlock(mp); 6657c478bd9Sstevel@tonic-gate if (act.sa_sigaction == SIG_DFL || 6667c478bd9Sstevel@tonic-gate act.sa_sigaction == SIG_IGN) 6677c478bd9Sstevel@tonic-gate act.sa_flags = SA_SIGINFO; 6687c478bd9Sstevel@tonic-gate else { 6697c478bd9Sstevel@tonic-gate act.sa_flags |= SA_SIGINFO; 6707c478bd9Sstevel@tonic-gate act.sa_flags &= ~(SA_NODEFER | SA_RESETHAND); 6717c478bd9Sstevel@tonic-gate } 6727c478bd9Sstevel@tonic-gate act.sa_sigaction = udp->sigacthandler; 6737c478bd9Sstevel@tonic-gate act.sa_mask = maskset; 674*f841f6adSraf (void) __sigaction(sig, &act, NULL); 6757c478bd9Sstevel@tonic-gate } 676