1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 <stddef.h>
38 #include <signal.h>
39 #include "sigev_thread.h"
40 #include "un-namespace.h"
41
42 __weak_reference(__aio_read, aio_read);
43 __weak_reference(__aio_readv, aio_readv);
44 __weak_reference(__aio_write, aio_write);
45 __weak_reference(__aio_writev, aio_writev);
46 __weak_reference(__aio_return, aio_return);
47 __weak_reference(__aio_waitcomplete, aio_waitcomplete);
48 __weak_reference(__aio_fsync, aio_fsync);
49 __weak_reference(__lio_listio, lio_listio);
50
51 typedef void (*aio_func)(union sigval val, struct aiocb *iocb);
52
53 extern int __sys_aio_read(struct aiocb *iocb);
54 extern int __sys_aio_readv(struct aiocb *iocb);
55 extern int __sys_aio_write(struct aiocb *iocb);
56 extern int __sys_aio_writev(struct aiocb *iocb);
57 extern ssize_t __sys_aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout);
58 extern ssize_t __sys_aio_return(struct aiocb *iocb);
59 extern int __sys_aio_error(struct aiocb *iocb);
60 extern int __sys_aio_fsync(int op, struct aiocb *iocb);
61 extern int __sys_lio_listio(int mode, struct aiocb * const list[], int nent,
62 struct sigevent *sig);
63
64 static void
aio_dispatch(struct sigev_node * sn)65 aio_dispatch(struct sigev_node *sn)
66 {
67 aio_func f = sn->sn_func;
68
69 f(sn->sn_value, (struct aiocb *)sn->sn_id);
70 }
71
72 static int
aio_sigev_alloc(sigev_id_t id,struct sigevent * sigevent,struct sigev_node ** sn,struct sigevent * saved_ev)73 aio_sigev_alloc(sigev_id_t id, struct sigevent *sigevent,
74 struct sigev_node **sn, struct sigevent *saved_ev)
75 {
76 if (__sigev_check_init()) {
77 /* This might be that thread library is not enabled. */
78 errno = EINVAL;
79 return (-1);
80 }
81
82 *sn = __sigev_alloc(SI_ASYNCIO, sigevent, NULL, 1);
83 if (*sn == NULL) {
84 errno = EAGAIN;
85 return (-1);
86 }
87
88 *saved_ev = *sigevent;
89 (*sn)->sn_id = id;
90 __sigev_get_sigevent(*sn, sigevent, (*sn)->sn_id);
91 (*sn)->sn_dispatch = aio_dispatch;
92
93 __sigev_list_lock();
94 __sigev_register(*sn);
95 __sigev_list_unlock();
96
97 return (0);
98 }
99
100 static int
aio_io(struct aiocb * iocb,int (* sysfunc)(struct aiocb * iocb))101 aio_io(struct aiocb *iocb, int (*sysfunc)(struct aiocb *iocb))
102 {
103 struct sigev_node *sn;
104 struct sigevent saved_ev;
105 int ret, err;
106
107 if (iocb->aio_sigevent.sigev_notify != SIGEV_THREAD) {
108 ret = sysfunc(iocb);
109 return (ret);
110 }
111
112 ret = aio_sigev_alloc((sigev_id_t)iocb, &iocb->aio_sigevent, &sn,
113 &saved_ev);
114 if (ret)
115 return (ret);
116 ret = sysfunc(iocb);
117 iocb->aio_sigevent = saved_ev;
118 if (ret != 0) {
119 err = errno;
120 __sigev_list_lock();
121 __sigev_delete_node(sn);
122 __sigev_list_unlock();
123 errno = err;
124 }
125 return (ret);
126 }
127
128 int
__aio_read(struct aiocb * iocb)129 __aio_read(struct aiocb *iocb)
130 {
131
132 return aio_io(iocb, &__sys_aio_read);
133 }
134
135 int
__aio_readv(struct aiocb * iocb)136 __aio_readv(struct aiocb *iocb)
137 {
138
139 return aio_io(iocb, &__sys_aio_readv);
140 }
141
142 int
__aio_write(struct aiocb * iocb)143 __aio_write(struct aiocb *iocb)
144 {
145
146 return aio_io(iocb, &__sys_aio_write);
147 }
148
149 int
__aio_writev(struct aiocb * iocb)150 __aio_writev(struct aiocb *iocb)
151 {
152
153 return aio_io(iocb, &__sys_aio_writev);
154 }
155
156 ssize_t
__aio_waitcomplete(struct aiocb ** iocbp,struct timespec * timeout)157 __aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout)
158 {
159 ssize_t ret;
160 int err;
161
162 ret = __sys_aio_waitcomplete(iocbp, timeout);
163 if (*iocbp) {
164 if ((*iocbp)->aio_sigevent.sigev_notify == SIGEV_THREAD) {
165 err = errno;
166 __sigev_list_lock();
167 __sigev_delete(SI_ASYNCIO, (sigev_id_t)(*iocbp));
168 __sigev_list_unlock();
169 errno = err;
170 }
171 }
172
173 return (ret);
174 }
175
176 ssize_t
__aio_return(struct aiocb * iocb)177 __aio_return(struct aiocb *iocb)
178 {
179
180 if (iocb->aio_sigevent.sigev_notify == SIGEV_THREAD) {
181 if (__sys_aio_error(iocb) == EINPROGRESS) {
182 /*
183 * Fail with EINVAL to match the semantics of
184 * __sys_aio_return() for an in-progress
185 * request.
186 */
187 errno = EINVAL;
188 return (-1);
189 }
190 __sigev_list_lock();
191 __sigev_delete(SI_ASYNCIO, (sigev_id_t)iocb);
192 __sigev_list_unlock();
193 }
194
195 return __sys_aio_return(iocb);
196 }
197
198 int
__aio_fsync(int op,struct aiocb * iocb)199 __aio_fsync(int op, struct aiocb *iocb)
200 {
201 struct sigev_node *sn;
202 struct sigevent saved_ev;
203 int ret, err;
204
205 if (iocb->aio_sigevent.sigev_notify != SIGEV_THREAD)
206 return __sys_aio_fsync(op, iocb);
207
208 ret = aio_sigev_alloc((sigev_id_t)iocb, &iocb->aio_sigevent, &sn,
209 &saved_ev);
210 if (ret)
211 return (ret);
212 ret = __sys_aio_fsync(op, iocb);
213 iocb->aio_sigevent = saved_ev;
214 if (ret != 0) {
215 err = errno;
216 __sigev_list_lock();
217 __sigev_delete_node(sn);
218 __sigev_list_unlock();
219 errno = err;
220 }
221 return (ret);
222 }
223
224 int
__lio_listio(int mode,struct aiocb * const list[],int nent,struct sigevent * sig)225 __lio_listio(int mode, struct aiocb * const list[], int nent,
226 struct sigevent *sig)
227 {
228 struct sigev_node *sn;
229 struct sigevent saved_ev;
230 int ret, err;
231
232 if (sig == NULL || sig->sigev_notify != SIGEV_THREAD)
233 return (__sys_lio_listio(mode, list, nent, sig));
234
235 ret = aio_sigev_alloc((sigev_id_t)list, sig, &sn, &saved_ev);
236 if (ret)
237 return (ret);
238 ret = __sys_lio_listio(mode, list, nent, sig);
239 *sig = saved_ev;
240 if (ret != 0) {
241 err = errno;
242 __sigev_list_lock();
243 __sigev_delete_node(sn);
244 __sigev_list_unlock();
245 errno = err;
246 }
247 return (ret);
248 }
249