1 /* 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 3 * 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 unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * 28 */ 29 30 #include <sys/cdefs.h> 31 #include <sys/types.h> 32 #include <sys/syscall.h> 33 #include <sys/aio.h> 34 35 #include "namespace.h" 36 #include <errno.h> 37 #include <pthread.h> 38 #include <stddef.h> 39 #include <signal.h> 40 #include <unistd.h> 41 #include "sigev_thread.h" 42 #include "un-namespace.h" 43 44 __weak_reference(__aio_read, _aio_read); 45 __weak_reference(__aio_read, aio_read); 46 __weak_reference(__aio_write, _aio_write); 47 __weak_reference(__aio_write, aio_write); 48 __weak_reference(__aio_return, _aio_return); 49 __weak_reference(__aio_return, aio_return); 50 __weak_reference(__aio_waitcomplete, _aio_waitcomplete); 51 __weak_reference(__aio_waitcomplete, aio_waitcomplete); 52 53 typedef void (*aio_func)(union sigval val, struct aiocb *iocb); 54 55 extern int __sys_aio_read(struct aiocb *iocb); 56 extern int __sys_aio_write(struct aiocb *iocb); 57 extern int __sys_aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout); 58 extern int __sys_aio_return(struct aiocb *iocb); 59 extern int __sys_aio_error(struct aiocb *iocb); 60 61 static void 62 aio_dispatch(struct sigev_node *sn) 63 { 64 aio_func f = sn->sn_func; 65 66 f(sn->sn_value, (struct aiocb *)sn->sn_id); 67 } 68 69 static int 70 aio_io(struct aiocb *iocb, int (*sysfunc)(struct aiocb *iocb)) 71 { 72 struct sigev_node *sn; 73 struct sigevent saved_ev; 74 int ret, err; 75 76 if (iocb->aio_sigevent.sigev_notify != SIGEV_THREAD) { 77 ret = sysfunc(iocb); 78 return (ret); 79 } 80 81 if (__sigev_check_init()) { 82 /* This might be that thread library is not enabled. */ 83 errno = EINVAL; 84 return (-1); 85 } 86 87 sn = __sigev_alloc(SI_ASYNCIO, &iocb->aio_sigevent, NULL, 1); 88 if (sn == NULL) { 89 errno = EAGAIN; 90 return (-1); 91 } 92 93 saved_ev = iocb->aio_sigevent; 94 sn->sn_id = (sigev_id_t)iocb; 95 sn->sn_flags |= SNF_ONESHOT; 96 __sigev_get_sigevent(sn, &iocb->aio_sigevent, sn->sn_id); 97 98 __sigev_list_lock(); 99 __sigev_register(sn); 100 __sigev_list_unlock(); 101 102 sn->sn_dispatch = aio_dispatch; 103 ret = sysfunc(iocb); 104 iocb->aio_sigevent = saved_ev; 105 106 if (ret != 0) { 107 err = errno; 108 __sigev_list_lock(); 109 __sigev_delete_node(sn); 110 __sigev_list_unlock(); 111 errno = err; 112 } 113 return (ret); 114 } 115 116 int 117 __aio_read(struct aiocb *iocb) 118 { 119 120 return aio_io(iocb, &__sys_aio_read); 121 } 122 123 int 124 __aio_write(struct aiocb *iocb) 125 { 126 127 return aio_io(iocb, &__sys_aio_write); 128 } 129 130 int 131 __aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout) 132 { 133 int err; 134 int ret = __sys_aio_waitcomplete(iocbp, timeout); 135 136 if (*iocbp) { 137 if ((*iocbp)->aio_sigevent.sigev_notify == SIGEV_THREAD) { 138 err = errno; 139 __sigev_list_lock(); 140 __sigev_delete(SI_ASYNCIO, (sigev_id_t)(*iocbp)); 141 __sigev_list_unlock(); 142 errno = err; 143 } 144 } 145 146 return (ret); 147 } 148 149 int 150 __aio_return(struct aiocb *iocb) 151 { 152 153 if (iocb->aio_sigevent.sigev_notify == SIGEV_THREAD) { 154 if (__sys_aio_error(iocb) == EINPROGRESS) 155 return (EINPROGRESS); 156 __sigev_list_lock(); 157 __sigev_delete(SI_ASYNCIO, (sigev_id_t)iocb); 158 __sigev_list_unlock(); 159 } 160 161 return __sys_aio_return(iocb); 162 } 163