1 /* $OpenBSD: uthread_accept.c,v 1.8 2003/12/23 19:31:05 brad Exp $ */
2 /*
3 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
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, this list of conditions and the following 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 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by John Birrell.
17 * 4. Neither the name of the author nor the names of any co-contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: uthread_accept.c,v 1.9 1999/08/28 00:03:20 peter Exp $
34 */
35 #include <errno.h>
36 #include <unistd.h>
37 #include <sys/types.h>
38 #include <sys/socket.h>
39 #include <fcntl.h>
40 #ifdef _THREAD_SAFE
41 #include <pthread.h>
42 #include "pthread_private.h"
43
44 int
accept(int fd,struct sockaddr * name,socklen_t * namelen)45 accept(int fd, struct sockaddr * name, socklen_t *namelen)
46 {
47 struct pthread *curthread = _get_curthread();
48 int ret;
49
50 /* This is a cancellation point: */
51 _thread_enter_cancellation_point();
52
53 /* Lock the file descriptor: */
54 if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) {
55 /* Enter a loop to wait for a connection request: */
56 while ((ret = _thread_sys_accept(fd, name, namelen)) < 0) {
57 /* Check if the socket is to block: */
58 if ((_thread_fd_table[fd]->flags & O_NONBLOCK) == 0 &&
59 (errno == EWOULDBLOCK || errno == EAGAIN)) {
60 /* Save the socket file descriptor: */
61 curthread->data.fd.fd = fd;
62 curthread->data.fd.fname = __FILE__;
63 curthread->data.fd.branch = __LINE__;
64
65 /* Set the timeout: */
66 _thread_kern_set_timeout(NULL);
67 curthread->interrupted = 0;
68
69 /* Schedule the next thread: */
70 _thread_kern_sched_state(PS_FDR_WAIT, __FILE__,
71 __LINE__);
72
73 /* Check if the wait was interrupted: */
74 if (curthread->interrupted) {
75 /* Return an error status: */
76 errno = EINTR;
77 ret = -1;
78 break;
79 }
80 } else {
81 /*
82 * Another error has occurred, so exit the
83 * loop here:
84 */
85 break;
86 }
87 }
88
89 /*
90 * If no errors initialize the file descriptor table
91 * for the new socket. Turn on blocking mode in the
92 * child if it is on in the parent. This is done
93 * as _thread_fd_table_init *may* have turned the flag on.
94 */
95 if (ret != -1) {
96 if (_thread_fd_table_init(ret) != 0) {
97 /* Quietly close the socket: */
98 _thread_sys_close(ret);
99 ret = -1;
100 } else if ((_thread_fd_table[fd]->flags & O_NONBLOCK) == 0)
101 _thread_fd_table[ret]->flags &= ~O_NONBLOCK;
102 }
103
104 /* Unlock the file descriptor: */
105 _FD_UNLOCK(fd, FD_RDWR);
106 }
107
108 /* No longer in a cancellation point: */
109 _thread_leave_cancellation_point();
110
111 /* Return the socket file descriptor or -1 on error: */
112 return (ret);
113 }
114 #endif
115