1 /* $OpenBSD: uthread_readv.c,v 1.7 2004/11/30 00:14:51 pat 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_readv.c,v 1.8 1999/08/28 00:03:43 peter Exp $
34 *
35 */
36 #include <sys/types.h>
37 #include <sys/fcntl.h>
38 #include <sys/uio.h>
39 #include <errno.h>
40 #include <unistd.h>
41 #ifdef _THREAD_SAFE
42 #include <pthread.h>
43 #include "pthread_private.h"
44
45 ssize_t
readv(int fd,const struct iovec * iov,int iovcnt)46 readv(int fd, const struct iovec * iov, int iovcnt)
47 {
48 struct pthread *curthread = _get_curthread();
49 ssize_t ret;
50 int type;
51
52 /* This is a cancellation point: */
53 _thread_enter_cancellation_point();
54
55 /* Lock the file descriptor for read: */
56 if ((ret = _FD_LOCK(fd, FD_READ, NULL)) == 0) {
57 /* Get the read/write mode type: */
58 type = _thread_fd_table[fd]->flags & O_ACCMODE;
59
60 /* Check if the file is not open for read: */
61 if (type != O_RDONLY && type != O_RDWR) {
62 /* File is not open for read: */
63 errno = EBADF;
64 _FD_UNLOCK(fd, FD_READ);
65 _thread_leave_cancellation_point();
66 return (-1);
67 }
68
69 /* Perform a non-blocking readv syscall: */
70 while ((ret = _thread_sys_readv(fd, iov, iovcnt)) < 0) {
71 if ((_thread_fd_table[fd]->flags & O_NONBLOCK) == 0 &&
72 (errno == EWOULDBLOCK || errno == EAGAIN)) {
73 curthread->data.fd.fd = fd;
74 _thread_kern_set_timeout(NULL);
75
76 /* Reset the interrupted operation flag: */
77 curthread->interrupted = 0;
78
79 _thread_kern_sched_state(PS_FDR_WAIT,
80 __FILE__, __LINE__);
81
82 /*
83 * Check if the operation was
84 * interrupted by a signal
85 */
86 if (curthread->interrupted) {
87 errno = EINTR;
88 ret = -1;
89 break;
90 }
91 } else {
92 break;
93 }
94 }
95 _FD_UNLOCK(fd, FD_READ);
96 }
97
98 /* No longer in a cancellation point: */
99 _thread_leave_cancellation_point();
100
101 return (ret);
102 }
103 #endif
104