1/* Copyright (C) 1993-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>.
17
18 As a special exception, if you link the code in this file with
19 files compiled with a GNU compiler to produce an executable,
20 that does not cause the resulting executable to be covered by
21 the GNU Lesser General Public License. This exception does not
22 however invalidate any other reasons why the executable file
23 might be covered by the GNU Lesser General Public License.
24 This exception applies to code released by its copyright holders
25 in files containing the exception. */
26
27#include <shlib-compat.h>
28#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
29
30#define _IO_USE_OLD_IO_FILE
31#include <stdlib.h>
32#include "libioP.h"
33#include <fcntl.h>
34
35#ifndef _IO_fcntl
36# define _IO_fcntl __fcntl
37#endif
38
39_IO_FILE *
40attribute_compat_text_section
41_IO_old_fdopen (int fd, const char *mode)
42{
43 int read_write;
44 int posix_mode = 0;
45 struct locked_FILE
46 {
47 struct _IO_FILE_complete_plus fp;
48#ifdef _IO_MTSAFE_IO
49 _IO_lock_t lock;
50#endif
51 } *new_f;
52 int fd_flags;
53
54 switch (*mode++)
55 {
56 case 'r':
57 read_write = _IO_NO_WRITES;
58 break;
59 case 'w':
60 read_write = _IO_NO_READS;
61 break;
62 case 'a':
63 posix_mode = O_APPEND;
64 read_write = _IO_NO_READS|_IO_IS_APPENDING;
65 break;
66 default:
67 MAYBE_SET_EINVAL;
68 return NULL;
69 }
70 if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))
71 read_write &= _IO_IS_APPENDING;
72#ifdef F_GETFL
73 fd_flags = _IO_fcntl (fd, F_GETFL);
74#ifndef O_ACCMODE
75#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
76#endif
77 if (fd_flags == -1
78 || ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES))
79 || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS)))
80 return NULL;
81
82 /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b)
83 [System Application Program Interface (API) Amendment 1:
84 Realtime Extensions], Rationale B.8.3.3
85 Open a Stream on a File Descriptor says:
86
87 Although not explicitly required by POSIX.1, a good
88 implementation of append ("a") mode would cause the
89 O_APPEND flag to be set.
90
91 (Historical implementations [such as Solaris2] do a one-time
92 seek in fdopen.)
93
94 However, we do not turn O_APPEND off if the mode is "w" (even
95 though that would seem consistent) because that would be more
96 likely to break historical programs.
97 */
98 if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND))
99 {
100#ifdef F_SETFL
101 if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1)
102#endif
103 return NULL;
104 }
105#endif
106
107 new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
108 if (new_f == NULL)
109 return NULL;
110#ifdef _IO_MTSAFE_IO
111 new_f->fp.file._file._lock = &new_f->lock;
112#endif
113 _IO_old_init (&new_f->fp.file._file, 0);
114 _IO_JUMPS_FILE_plus (&new_f->fp) = &_IO_old_file_jumps;
115 _IO_old_file_init ((struct _IO_FILE_plus *) &new_f->fp);
116#if !_IO_UNIFIED_JUMPTABLES
117 new_f->fp.vtable = NULL;
118#endif
119 if (_IO_old_file_attach (&new_f->fp.file._file, fd) == NULL)
120 {
121 _IO_un_link ((struct _IO_FILE_plus *) &new_f->fp);
122 free (new_f);
123 return NULL;
124 }
125 new_f->fp.file._file._flags &= ~_IO_DELETE_DONT_CLOSE;
126
127 _IO_mask_flags (&new_f->fp.file._file, read_write,
128 _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
129
130 return (_IO_FILE *) &new_f->fp;
131}
132
133strong_alias (_IO_old_fdopen, __old_fdopen)
134compat_symbol (libc, _IO_old_fdopen, _IO_fdopen, GLIBC_2_0);
135compat_symbol (libc, __old_fdopen, fdopen, GLIBC_2_0);
136
137#endif
138