2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/types.h>
33 #include <sys/fcntl.h>
38 #include "pthread_private.h"
40 __weak_reference(__read, read);
43 _read(int fd, void *buf, size_t nbytes)
45 struct pthread *curthread = _get_curthread();
49 /* POSIX says to do just this: */
54 /* Lock the file descriptor for read: */
55 if ((ret = _FD_LOCK(fd, FD_READ, NULL)) == 0) {
56 /* Get the read/write mode type: */
57 type = _thread_fd_getflags(fd) & O_ACCMODE;
59 /* Check if the file is not open for read: */
60 if (type != O_RDONLY && type != O_RDWR) {
61 /* File is not open for read: */
63 _FD_UNLOCK(fd, FD_READ);
67 /* Perform a non-blocking read syscall: */
68 while ((ret = __sys_read(fd, buf, nbytes)) < 0) {
69 if ((_thread_fd_getflags(fd) & O_NONBLOCK) == 0 &&
70 (errno == EWOULDBLOCK || errno == EAGAIN)) {
71 curthread->data.fd.fd = fd;
72 _thread_kern_set_timeout(NULL);
74 /* Reset the interrupted operation flag: */
75 curthread->interrupted = 0;
77 _thread_kern_sched_state(PS_FDR_WAIT,
81 * Check if the operation was
82 * interrupted by a signal
84 if (curthread->interrupted) {
93 _FD_UNLOCK(fd, FD_READ);
99 __read(int fd, void *buf, size_t nbytes)
103 _thread_enter_cancellation_point();
104 ret = _read(fd, buf, nbytes);
105 _thread_leave_cancellation_point();