1/*
2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
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, 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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
| 1/*
2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
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, 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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
|
32 * $FreeBSD: head/lib/libkse/thread/thr_write.c 50476 1999-08-28 00:22:10Z peter $
| 32 * $FreeBSD: head/lib/libkse/thread/thr_write.c 53812 1999-11-28 05:38:13Z alfred $
|
33 *
34 */
35#include <sys/types.h>
36#include <sys/fcntl.h>
37#include <sys/uio.h>
38#include <errno.h>
39#include <unistd.h>
40#ifdef _THREAD_SAFE
41#include <pthread.h>
42#include "pthread_private.h"
43
44ssize_t
45write(int fd, const void *buf, size_t nbytes)
46{
47 int blocking;
48 int type;
49 ssize_t n;
50 ssize_t num = 0;
51 ssize_t ret;
52
| 33 *
34 */
35#include <sys/types.h>
36#include <sys/fcntl.h>
37#include <sys/uio.h>
38#include <errno.h>
39#include <unistd.h>
40#ifdef _THREAD_SAFE
41#include <pthread.h>
42#include "pthread_private.h"
43
44ssize_t
45write(int fd, const void *buf, size_t nbytes)
46{
47 int blocking;
48 int type;
49 ssize_t n;
50 ssize_t num = 0;
51 ssize_t ret;
52
|
| 53 _thread_enter_cancellation_point();
|
53 /* POSIX says to do just this: */
| 54 /* POSIX says to do just this: */
|
54 if (nbytes == 0)
| 55 if (nbytes == 0) {
56 _thread_leave_cancellation_point();
|
55 return (0);
| 57 return (0);
|
| 58 }
|
56
57 /* Lock the file descriptor for write: */
58 if ((ret = _FD_LOCK(fd, FD_WRITE, NULL)) == 0) {
59 /* Get the read/write mode type: */
60 type = _thread_fd_table[fd]->flags & O_ACCMODE;
61
62 /* Check if the file is not open for write: */
63 if (type != O_WRONLY && type != O_RDWR) {
64 /* File is not open for write: */
65 errno = EBADF;
66 _FD_UNLOCK(fd, FD_WRITE);
| 59
60 /* Lock the file descriptor for write: */
61 if ((ret = _FD_LOCK(fd, FD_WRITE, NULL)) == 0) {
62 /* Get the read/write mode type: */
63 type = _thread_fd_table[fd]->flags & O_ACCMODE;
64
65 /* Check if the file is not open for write: */
66 if (type != O_WRONLY && type != O_RDWR) {
67 /* File is not open for write: */
68 errno = EBADF;
69 _FD_UNLOCK(fd, FD_WRITE);
|
67 return (-1);
| 70 _thread_leave_cancellation_point();
71 return (-1);
|
68 }
69
70 /* Check if file operations are to block */
71 blocking = ((_thread_fd_table[fd]->flags & O_NONBLOCK) == 0);
72
73 /*
74 * Loop while no error occurs and until the expected number
75 * of bytes are written if performing a blocking write:
76 */
77 while (ret == 0) {
78 /* Perform a non-blocking write syscall: */
79 n = _thread_sys_write(fd, buf + num, nbytes - num);
80
81 /* Check if one or more bytes were written: */
82 if (n > 0)
83 /*
84 * Keep a count of the number of bytes
85 * written:
86 */
87 num += n;
88
89 /*
90 * If performing a blocking write, check if the
91 * write would have blocked or if some bytes
92 * were written but there are still more to
93 * write:
94 */
95 if (blocking && ((n < 0 && (errno == EWOULDBLOCK ||
96 errno == EAGAIN)) || (n >= 0 && num < nbytes))) {
97 _thread_run->data.fd.fd = fd;
98 _thread_kern_set_timeout(NULL);
99
100 /* Reset the interrupted operation flag: */
101 _thread_run->interrupted = 0;
102
103 _thread_kern_sched_state(PS_FDW_WAIT,
104 __FILE__, __LINE__);
105
106 /*
107 * Check if the operation was
108 * interrupted by a signal
109 */
110 if (_thread_run->interrupted) {
111 /* Return an error: */
112 ret = -1;
113 }
114
115 /*
116 * If performing a non-blocking write or if an
117 * error occurred, just return whatever the write
118 * syscall did:
119 */
120 } else if (!blocking || n < 0) {
121 /* A non-blocking call might return zero: */
122 ret = n;
123 break;
124
125 /* Check if the write has completed: */
126 } else if (num >= nbytes)
127 /* Return the number of bytes written: */
128 ret = num;
129 }
130 _FD_UNLOCK(fd, FD_RDWR);
131 }
| 72 }
73
74 /* Check if file operations are to block */
75 blocking = ((_thread_fd_table[fd]->flags & O_NONBLOCK) == 0);
76
77 /*
78 * Loop while no error occurs and until the expected number
79 * of bytes are written if performing a blocking write:
80 */
81 while (ret == 0) {
82 /* Perform a non-blocking write syscall: */
83 n = _thread_sys_write(fd, buf + num, nbytes - num);
84
85 /* Check if one or more bytes were written: */
86 if (n > 0)
87 /*
88 * Keep a count of the number of bytes
89 * written:
90 */
91 num += n;
92
93 /*
94 * If performing a blocking write, check if the
95 * write would have blocked or if some bytes
96 * were written but there are still more to
97 * write:
98 */
99 if (blocking && ((n < 0 && (errno == EWOULDBLOCK ||
100 errno == EAGAIN)) || (n >= 0 && num < nbytes))) {
101 _thread_run->data.fd.fd = fd;
102 _thread_kern_set_timeout(NULL);
103
104 /* Reset the interrupted operation flag: */
105 _thread_run->interrupted = 0;
106
107 _thread_kern_sched_state(PS_FDW_WAIT,
108 __FILE__, __LINE__);
109
110 /*
111 * Check if the operation was
112 * interrupted by a signal
113 */
114 if (_thread_run->interrupted) {
115 /* Return an error: */
116 ret = -1;
117 }
118
119 /*
120 * If performing a non-blocking write or if an
121 * error occurred, just return whatever the write
122 * syscall did:
123 */
124 } else if (!blocking || n < 0) {
125 /* A non-blocking call might return zero: */
126 ret = n;
127 break;
128
129 /* Check if the write has completed: */
130 } else if (num >= nbytes)
131 /* Return the number of bytes written: */
132 ret = num;
133 }
134 _FD_UNLOCK(fd, FD_RDWR);
135 }
|
| 136 _thread_leave_cancellation_point();
|
132 return (ret);
133}
134#endif
| 137 return (ret);
138}
139#endif
|