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d614a753 | 1 | /* Copyright (C) 1993-2020 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
bd355af0 | 3 | |
41bdb6e2 AJ |
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. | |
bd355af0 | 8 | |
41bdb6e2 AJ |
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 | |
bd355af0 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 12 | Lesser General Public License for more details. |
bd355af0 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. |
bd355af0 | 17 | |
41bdb6e2 AJ |
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. */ | |
bd355af0 | 26 | |
16710d58 RM |
27 | #include <shlib-compat.h> |
28 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
29 | ||
bd355af0 | 30 | #define _IO_USE_OLD_IO_FILE |
c8a89e7d | 31 | #include <stdlib.h> |
bd355af0 UD |
32 | #include "libioP.h" |
33 | #include <fcntl.h> | |
34 | ||
9964a145 | 35 | FILE * |
4a381a81 | 36 | attribute_compat_text_section |
9d46370c | 37 | _IO_old_fdopen (int fd, const char *mode) |
bd355af0 UD |
38 | { |
39 | int read_write; | |
40 | int posix_mode = 0; | |
41 | struct locked_FILE | |
42 | { | |
7ea11363 | 43 | struct _IO_FILE_complete_plus fp; |
bd355af0 UD |
44 | #ifdef _IO_MTSAFE_IO |
45 | _IO_lock_t lock; | |
46 | #endif | |
47 | } *new_f; | |
48 | int fd_flags; | |
49 | ||
50 | switch (*mode++) | |
51 | { | |
52 | case 'r': | |
53 | read_write = _IO_NO_WRITES; | |
54 | break; | |
55 | case 'w': | |
56 | read_write = _IO_NO_READS; | |
57 | break; | |
58 | case 'a': | |
59 | posix_mode = O_APPEND; | |
60 | read_write = _IO_NO_READS|_IO_IS_APPENDING; | |
61 | break; | |
62 | default: | |
30bfee26 | 63 | __set_errno (EINVAL); |
bd355af0 UD |
64 | return NULL; |
65 | } | |
66 | if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) | |
67 | read_write &= _IO_IS_APPENDING; | |
5f0704b6 | 68 | fd_flags = __fcntl (fd, F_GETFL); |
bd355af0 UD |
69 | if (fd_flags == -1 |
70 | || ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES)) | |
71 | || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS))) | |
72 | return NULL; | |
73 | ||
74 | /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b) | |
75 | [System Application Program Interface (API) Amendment 1: | |
76 | Realtime Extensions], Rationale B.8.3.3 | |
77 | Open a Stream on a File Descriptor says: | |
78 | ||
79 | Although not explicitly required by POSIX.1, a good | |
80 | implementation of append ("a") mode would cause the | |
81 | O_APPEND flag to be set. | |
82 | ||
83 | (Historical implementations [such as Solaris2] do a one-time | |
84 | seek in fdopen.) | |
85 | ||
86 | However, we do not turn O_APPEND off if the mode is "w" (even | |
87 | though that would seem consistent) because that would be more | |
88 | likely to break historical programs. | |
89 | */ | |
90 | if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND)) | |
91 | { | |
5f0704b6 | 92 | if (__fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1) |
bd355af0 UD |
93 | return NULL; |
94 | } | |
bd355af0 UD |
95 | |
96 | new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); | |
97 | if (new_f == NULL) | |
98 | return NULL; | |
99 | #ifdef _IO_MTSAFE_IO | |
7ea11363 | 100 | new_f->fp.file._file._lock = &new_f->lock; |
bd355af0 | 101 | #endif |
7ea11363 | 102 | _IO_old_init (&new_f->fp.file._file, 0); |
e69dcccb | 103 | _IO_JUMPS_FILE_plus (&new_f->fp) = &_IO_old_file_jumps; |
db3476af | 104 | _IO_old_file_init_internal ((struct _IO_FILE_plus *) &new_f->fp); |
7ea11363 | 105 | if (_IO_old_file_attach (&new_f->fp.file._file, fd) == NULL) |
bd355af0 | 106 | { |
d18ea0c5 | 107 | _IO_un_link ((struct _IO_FILE_plus *) &new_f->fp); |
bd355af0 UD |
108 | free (new_f); |
109 | return NULL; | |
110 | } | |
7ea11363 | 111 | new_f->fp.file._file._flags &= ~_IO_DELETE_DONT_CLOSE; |
bd355af0 | 112 | |
817328ee AS |
113 | _IO_mask_flags (&new_f->fp.file._file, read_write, |
114 | _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); | |
bd355af0 | 115 | |
9964a145 | 116 | return (FILE *) &new_f->fp; |
bd355af0 UD |
117 | } |
118 | ||
119 | strong_alias (_IO_old_fdopen, __old_fdopen) | |
16710d58 RM |
120 | compat_symbol (libc, _IO_old_fdopen, _IO_fdopen, GLIBC_2_0); |
121 | compat_symbol (libc, __old_fdopen, fdopen, GLIBC_2_0); | |
122 | ||
123 | #endif |