Annotation of prex/usr/lib/libc/stdio/fdopen.c, Revision 1.1.1.1
1.1 nbrk 1: /*-
2: * Copyright (c) 1990, 1993
3: * The Regents of the University of California. 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. Neither the name of the University nor the names of its 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 THE REGENTS 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 REGENTS 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:
33: #include <sys/types.h>
34: #include <fcntl.h>
35: #include <unistd.h>
36: #include <stdio.h>
37: #include <errno.h>
38: #include "local.h"
39:
40: FILE *
41: fdopen(fd, mode)
42: int fd;
43: const char *mode;
44: {
45: FILE *fp;
46: int flags, oflags, fdflags, tmp;
47:
48: if ((flags = __sflags(mode, &oflags)) == 0)
49: return (NULL);
50:
51: /* Make sure the mode the user wants is a subset of the actual mode. */
52: if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
53: return (NULL);
54: tmp = fdflags & O_ACCMODE;
55: if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
56: errno = EINVAL;
57: return (NULL);
58: }
59:
60: if ((fp = __sfp()) == NULL)
61: return (NULL);
62: fp->_flags = flags;
63: /*
64: * If opened for appending, but underlying descriptor does not have
65: * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
66: * end before each write.
67: */
68: if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
69: fp->_flags |= __SAPP;
70: fp->_file = fd;
71: return (fp);
72: }
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