1 /* 2 * Copyright (c) 2003 Jeffrey Roberson <jeff@freebsd.org> 3 * Copyright (c) 2003 Jonathan Mini <mini@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include <sys/param.h> 31 #include <sys/types.h> 32 #include <sys/signalvar.h> 33 #include <signal.h> 34 #include <fcntl.h> 35 #include <unistd.h> 36 #include <setjmp.h> 37 #include <errno.h> 38 #include <pthread.h> 39 #include "thr_private.h" 40 41 /* #define DEBUG_SIGNAL */ 42 #ifdef DEBUG_SIGNAL 43 #define DBG_MSG stdout_debug 44 #else 45 #define DBG_MSG(x...) 46 #endif 47 48 __weak_reference(_sigprocmask, sigprocmask); 49 50 int 51 _sigprocmask(int how, const sigset_t *set, sigset_t *oset) 52 { 53 sigset_t new; 54 55 /* 56 * Make sure applications can't unblock our synchronization 57 * signal. We always want to take this with sigwait(). 58 */ 59 if (set != NULL) { 60 new = *set; 61 switch (how) { 62 case SIG_BLOCK: 63 case SIG_SETMASK: 64 SIGADDSET(new, SIGTHR); 65 break; 66 case SIG_UNBLOCK: 67 SIGDELSET(new, SIGTHR); 68 break; 69 default: 70 break; 71 } 72 set = &new; 73 } 74 75 return (__sys_sigprocmask(how, set, oset)); 76 } 77 78 __weak_reference(_pthread_sigmask, pthread_sigmask); 79 80 int 81 _pthread_sigmask(int how, const sigset_t *set, sigset_t *oset) 82 { 83 int error; 84 85 /* 86 * This always sets the mask on the current thread. 87 */ 88 error = sigprocmask(how, set, oset); 89 90 /* 91 * pthread_sigmask returns errno or success while sigprocmask returns 92 * -1 and sets errno. 93 */ 94 if (error == -1) 95 error = errno; 96 97 return (error); 98 } 99 100 101 __weak_reference(_pthread_kill, pthread_kill); 102 103 int 104 _pthread_kill(pthread_t pthread, int sig) 105 { 106 107 if (_thread_initial == NULL) 108 _thread_init(); 109 return (thr_kill(pthread->thr_id, sig)); 110 } 111 112 /* 113 * User thread signal handler wrapper. 114 */ 115 void 116 _thread_sig_wrapper(int sig, siginfo_t *info, void *context) 117 { 118 struct pthread_state_data psd; 119 __siginfohandler_t *handler; 120 121 GIANT_LOCK(curthread); 122 /* Save the thread's previous state. */ 123 psd.psd_wait_data = curthread->data; 124 psd.psd_state = curthread->state; 125 psd.psd_flags = curthread->flags; 126 127 /* 128 * Do a little cleanup handling for those threads in 129 * queues before calling the signal handler. Signals 130 * for these threads are temporarily blocked until 131 * after cleanup handling. 132 */ 133 switch (psd.psd_state) { 134 case PS_COND_WAIT: 135 _cond_wait_backout(curthread); 136 psd.psd_state = PS_RUNNING; 137 break; 138 139 case PS_MUTEX_WAIT: 140 _mutex_lock_backout(curthread); 141 psd.psd_state = PS_RUNNING; 142 break; 143 144 default: 145 break; 146 } 147 148 if (_thread_sigact[sig -1].sa_handler != NULL) { 149 GIANT_UNLOCK(curthread); 150 handler = (__siginfohandler_t *) 151 _thread_sigact[sig - 1].sa_handler; 152 handler(sig, info, (ucontext_t *)context); 153 GIANT_LOCK(curthread); 154 } 155 156 /* Restore the signal frame. */ 157 curthread->data = psd.psd_wait_data; 158 curthread->state = psd.psd_state; 159 curthread->flags = psd.psd_flags & 160 (PTHREAD_FLAGS_PRIVATE | PTHREAD_FLAGS_TRACE); 161 GIANT_UNLOCK(curthread); 162 } 163