1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/types.h> 29 #include <sys/bitmap.h> 30 #include <sys/sysmacros.h> 31 #include <sys/systm.h> 32 #include <sys/user.h> 33 #include <sys/errno.h> 34 #include <sys/proc.h> 35 #include <sys/fault.h> 36 #include <sys/procset.h> 37 #include <sys/signal.h> 38 #include <sys/siginfo.h> 39 #include <sys/time.h> 40 #include <sys/kmem.h> 41 #include <sys/schedctl.h> 42 #include <sys/debug.h> 43 #include <sys/condvar_impl.h> 44 #include <sys/model.h> 45 #include <sys/sdt.h> 46 #include <sys/zone.h> 47 48 static int 49 copyout_siginfo(model_t datamodel, k_siginfo_t *ksip, void *uaddr) 50 { 51 zoneid_t zoneid = getzoneid(); 52 53 if (datamodel == DATAMODEL_NATIVE) { 54 if (SI_FROMUSER(ksip) && zoneid != GLOBAL_ZONEID && 55 zoneid != ksip->si_zoneid) { 56 k_siginfo_t sani_sip = *ksip; 57 sani_sip.si_pid = curproc->p_zone->zone_zsched->p_pid; 58 sani_sip.si_uid = 0; 59 sani_sip.si_ctid = -1; 60 sani_sip.si_zoneid = zoneid; 61 if (copyout(&sani_sip, uaddr, sizeof (sani_sip))) 62 return (set_errno(EFAULT)); 63 } else { 64 if (copyout(ksip, uaddr, sizeof (*ksip))) 65 return (set_errno(EFAULT)); 66 } 67 } 68 #ifdef _SYSCALL32_IMPL 69 else { 70 siginfo32_t si32; 71 72 siginfo_kto32(ksip, &si32); 73 if (SI_FROMUSER(ksip) && zoneid != GLOBAL_ZONEID && 74 zoneid != ksip->si_zoneid) { 75 si32.si_pid = curproc->p_zone->zone_zsched->p_pid; 76 si32.si_uid = 0; 77 si32.si_ctid = -1; 78 si32.si_zoneid = zoneid; 79 } 80 if (copyout(&si32, uaddr, sizeof (si32))) 81 return (set_errno(EFAULT)); 82 } 83 #endif 84 return (ksip->si_signo); 85 } 86 87 /* 88 * Wait until a signal within a specified set is posted or until the 89 * time interval 'timeout' if specified. The signal is caught but 90 * not delivered. The value of the signal is returned to the caller. 91 */ 92 int 93 sigtimedwait(sigset_t *setp, siginfo_t *siginfop, timespec_t *timeoutp) 94 { 95 sigset_t set; 96 k_sigset_t oldmask; 97 kthread_t *t = curthread; 98 klwp_t *lwp = ttolwp(t); 99 proc_t *p = ttoproc(t); 100 timespec_t sig_timeout; 101 timespec_t *rqtp = NULL; 102 int timecheck = 0; 103 int ret; 104 int error = 0; 105 k_siginfo_t info, *infop; 106 model_t datamodel = get_udatamodel(); 107 108 if (timeoutp) { 109 timespec_t now; 110 111 timecheck = timechanged; 112 gethrestime(&now); 113 if (datamodel == DATAMODEL_NATIVE) { 114 if (copyin(timeoutp, &sig_timeout, 115 sizeof (sig_timeout))) 116 return (set_errno(EFAULT)); 117 } else { 118 timespec32_t timeout32; 119 120 if (copyin(timeoutp, &timeout32, sizeof (timeout32))) 121 return (set_errno(EFAULT)); 122 TIMESPEC32_TO_TIMESPEC(&sig_timeout, &timeout32) 123 } 124 125 if (itimerspecfix(&sig_timeout)) 126 return (set_errno(EINVAL)); 127 /* 128 * Convert the timespec value into absolute time. 129 */ 130 timespecadd(&sig_timeout, &now); 131 rqtp = &sig_timeout; 132 } 133 if (copyin(setp, &set, sizeof (set))) 134 return (set_errno(EFAULT)); 135 sigutok(&set, &t->t_sigwait); 136 if (sigisempty(&t->t_sigwait)) 137 return (set_errno(EINVAL)); 138 139 mutex_enter(&p->p_lock); 140 /* 141 * set the thread's signal mask to unmask 142 * those signals in the specified set. 143 */ 144 schedctl_finish_sigblock(t); 145 oldmask = t->t_hold; 146 sigdiffset(&t->t_hold, &t->t_sigwait); 147 148 /* 149 * Wait until we take a signal or until 150 * the absolute future time is passed. 151 */ 152 while ((ret = cv_waituntil_sig(&t->t_delay_cv, &p->p_lock, 153 rqtp, timecheck)) > 0) 154 continue; 155 if (ret == -1) 156 error = EAGAIN; 157 158 /* 159 * Restore thread's signal mask to its previous value. 160 */ 161 t->t_hold = oldmask; 162 t->t_sig_check = 1; /* so post_syscall sees new t_hold mask */ 163 164 if (error) { 165 mutex_exit(&p->p_lock); 166 sigemptyset(&t->t_sigwait); 167 return (set_errno(error)); /* timer expired */ 168 } 169 /* 170 * Don't bother with signal if it is not in request set. 171 */ 172 if (lwp->lwp_cursig == 0 || 173 !sigismember(&t->t_sigwait, lwp->lwp_cursig)) { 174 mutex_exit(&p->p_lock); 175 /* 176 * lwp_cursig is zero if pokelwps() awakened cv_wait_sig(). 177 * This happens if some other thread in this process called 178 * forkall() or exit(). 179 */ 180 sigemptyset(&t->t_sigwait); 181 return (set_errno(EINTR)); 182 } 183 184 if (lwp->lwp_curinfo) 185 infop = &lwp->lwp_curinfo->sq_info; 186 else { 187 infop = &info; 188 bzero(infop, sizeof (info)); 189 infop->si_signo = lwp->lwp_cursig; 190 infop->si_code = SI_NOINFO; 191 } 192 193 lwp->lwp_ru.nsignals++; 194 ret = lwp->lwp_cursig; 195 DTRACE_PROC2(signal__clear, int, ret, ksiginfo_t *, infop); 196 lwp->lwp_cursig = 0; 197 lwp->lwp_extsig = 0; 198 mutex_exit(&p->p_lock); 199 200 if (siginfop) 201 ret = copyout_siginfo(datamodel, infop, siginfop); 202 if (lwp->lwp_curinfo) { 203 siginfofree(lwp->lwp_curinfo); 204 lwp->lwp_curinfo = NULL; 205 } 206 sigemptyset(&t->t_sigwait); 207 return (ret); 208 } 209