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1 | /* Copyright (C) 1993, 1994, 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU IO Library. | |
3 | ||
4 | This library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU General Public License as | |
6 | published by the Free Software Foundation; either version 2, or (at | |
7 | your option) any later version. | |
8 | ||
9 | This library is distributed in the hope that it will be useful, but | |
10 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this library; see the file COPYING. If not, write to | |
16 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston, | |
17 | MA 02111-1307, USA. | |
18 | ||
19 | As a special exception, if you link this library with files | |
20 | compiled with a GNU compiler to produce an executable, this does | |
21 | not cause the resulting executable to be covered by the GNU General | |
22 | Public License. This exception does not however invalidate any | |
23 | other reasons why the executable file might be covered by the GNU | |
24 | General Public License. */ | |
25 | ||
26 | #define _IO_USE_OLD_IO_FILE | |
27 | #ifdef __STDC__ | |
28 | #include <stdlib.h> | |
29 | #endif | |
30 | #include "libioP.h" | |
31 | #include <fcntl.h> | |
32 | ||
33 | #ifndef _IO_fcntl | |
34 | #define _IO_fcntl fcntl | |
35 | #endif | |
36 | ||
37 | _IO_FILE * | |
38 | _IO_old_fdopen (fd, mode) | |
39 | int fd; | |
40 | const char *mode; | |
41 | { | |
42 | int read_write; | |
43 | int posix_mode = 0; | |
44 | struct locked_FILE | |
45 | { | |
46 | struct _IO_FILE_plus fp; | |
47 | #ifdef _IO_MTSAFE_IO | |
48 | _IO_lock_t lock; | |
49 | #endif | |
50 | } *new_f; | |
51 | int fd_flags; | |
52 | ||
53 | switch (*mode++) | |
54 | { | |
55 | case 'r': | |
56 | read_write = _IO_NO_WRITES; | |
57 | break; | |
58 | case 'w': | |
59 | read_write = _IO_NO_READS; | |
60 | break; | |
61 | case 'a': | |
62 | posix_mode = O_APPEND; | |
63 | read_write = _IO_NO_READS|_IO_IS_APPENDING; | |
64 | break; | |
65 | default: | |
66 | MAYBE_SET_EINVAL; | |
67 | return NULL; | |
68 | } | |
69 | if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) | |
70 | read_write &= _IO_IS_APPENDING; | |
71 | #ifdef F_GETFL | |
72 | fd_flags = _IO_fcntl (fd, F_GETFL); | |
73 | #ifndef O_ACCMODE | |
74 | #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) | |
75 | #endif | |
76 | if (fd_flags == -1 | |
77 | || ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES)) | |
78 | || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS))) | |
79 | return NULL; | |
80 | ||
81 | /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b) | |
82 | [System Application Program Interface (API) Amendment 1: | |
83 | Realtime Extensions], Rationale B.8.3.3 | |
84 | Open a Stream on a File Descriptor says: | |
85 | ||
86 | Although not explicitly required by POSIX.1, a good | |
87 | implementation of append ("a") mode would cause the | |
88 | O_APPEND flag to be set. | |
89 | ||
90 | (Historical implementations [such as Solaris2] do a one-time | |
91 | seek in fdopen.) | |
92 | ||
93 | However, we do not turn O_APPEND off if the mode is "w" (even | |
94 | though that would seem consistent) because that would be more | |
95 | likely to break historical programs. | |
96 | */ | |
97 | if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND)) | |
98 | { | |
99 | #ifdef F_SETFL | |
100 | if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1) | |
101 | #endif | |
102 | return NULL; | |
103 | } | |
104 | #endif | |
105 | ||
106 | new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); | |
107 | if (new_f == NULL) | |
108 | return NULL; | |
109 | #ifdef _IO_MTSAFE_IO | |
110 | new_f->fp.file._lock = &new_f->lock; | |
111 | #endif | |
112 | _IO_init (&new_f->fp.file, 0); | |
113 | _IO_JUMPS (&new_f->fp) = &_IO_old_file_jumps; | |
114 | _IO_old_file_init (&new_f->fp.file); | |
115 | #if !_IO_UNIFIED_JUMPTABLES | |
116 | new_f->fp.vtable = NULL; | |
117 | #endif | |
118 | if (_IO_old_file_attach (&new_f->fp.file, fd) == NULL) | |
119 | { | |
120 | _IO_un_link (&new_f->fp.file); | |
121 | free (new_f); | |
122 | return NULL; | |
123 | } | |
124 | new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE; | |
125 | ||
126 | new_f->fp.file._IO_file_flags = | |
127 | _IO_mask_flags (&new_f->fp.file, read_write, | |
128 | _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); | |
129 | ||
130 | return (_IO_FILE *) &new_f->fp; | |
131 | } | |
132 | ||
133 | strong_alias (_IO_old_fdopen, __old_fdopen) | |
134 | symbol_version (_IO_old_fdopen, _IO_fdopen, GLIBC_2.0); | |
135 | symbol_version (__old_fdopen, fdopen, GLIBC_2.0); |