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8f953e65 CP |
1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Chris Torek. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following 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 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #if defined(LIBC_SCCS) && !defined(lint) | |
38 | /*static char *sccsid = "from: @(#)fdopen.c 5.6 (Berkeley) 2/24/91";*/ | |
39 | static char *rcsid = "$Id: fdopen.c,v 1.15 1994/01/27 06:07:52 proven Exp $"; | |
40 | #endif /* LIBC_SCCS and not lint */ | |
41 | ||
42 | #include <pthread.h> | |
43 | #include <sys/types.h> | |
44 | #include <fcntl.h> | |
45 | #include <unistd.h> | |
46 | #include <stdio.h> | |
47 | #include <errno.h> | |
48 | #include "local.h" | |
49 | ||
50 | extern pthread_mutex_t __sfp_mutex; | |
51 | extern pthread_cond_t __sfp_cond; | |
52 | extern int __sfp_state; | |
53 | ||
54 | FILE *fdopen(int fd, const char *mode) | |
55 | { | |
56 | register FILE *fp; | |
57 | int flags, oflags, fdflags, tmp; | |
58 | ||
59 | if ((flags = __sflags(mode, &oflags)) == 0) | |
60 | return (NULL); | |
61 | ||
62 | /* Make sure the mode the user wants is a subset of the actual mode. */ | |
63 | if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0) | |
64 | return (NULL); | |
65 | tmp = fdflags & O_ACCMODE; | |
66 | if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { | |
67 | errno = EINVAL; | |
68 | return (NULL); | |
69 | } | |
70 | ||
71 | pthread_once(&__sdidinit, __sinit); | |
72 | pthread_mutex_lock(&__sfp_mutex); | |
73 | while (__sfp_state) { | |
74 | pthread_cond_wait(&__sfp_cond, &__sfp_mutex); | |
75 | } | |
76 | ||
77 | if (fp = __sfp()) { | |
78 | fp->_flags = flags; | |
79 | ||
80 | /* | |
81 | * If opened for appending, but underlying descriptor does not have | |
82 | * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to | |
83 | * end before each write. | |
84 | */ | |
85 | if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) | |
86 | fp->_flags |= __SAPP; | |
87 | fp->_file = fd; | |
88 | ||
89 | } | |
90 | pthread_mutex_unlock(&__sfp_mutex); | |
91 | return (fp); | |
92 | } |