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e1586792 | 1 | /* Copyright (C) 1993, 1994, 1997, 1998 Free Software Foundation, Inc. |
40a55d20 | 2 | This file is part of the GNU IO Library. |
96aa2d94 | 3 | |
40a55d20 UD |
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. | |
96aa2d94 | 8 | |
40a55d20 UD |
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. | |
96aa2d94 | 13 | |
40a55d20 UD |
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. | |
96aa2d94 | 18 | |
40a55d20 UD |
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. */ | |
96aa2d94 RM |
25 | |
26 | #ifdef __STDC__ | |
27 | #include <stdlib.h> | |
28 | #endif | |
29 | #include "libioP.h" | |
30 | #include <fcntl.h> | |
31 | ||
32 | #ifndef _IO_fcntl | |
50304ef0 UD |
33 | #ifdef _LIBC |
34 | #define _IO_fcntl __fcntl | |
35 | #else | |
96aa2d94 RM |
36 | #define _IO_fcntl fcntl |
37 | #endif | |
50304ef0 | 38 | #endif |
96aa2d94 RM |
39 | |
40 | _IO_FILE * | |
bd355af0 | 41 | _IO_new_fdopen (fd, mode) |
96aa2d94 RM |
42 | int fd; |
43 | const char *mode; | |
44 | { | |
45 | int read_write; | |
46 | int posix_mode = 0; | |
edf5b2d7 UD |
47 | struct locked_FILE |
48 | { | |
bd355af0 | 49 | struct _IO_FILE_plus fp; |
499e7464 | 50 | #ifdef _IO_MTSAFE_IO |
edf5b2d7 | 51 | _IO_lock_t lock; |
499e7464 | 52 | #endif |
edf5b2d7 | 53 | } *new_f; |
96aa2d94 RM |
54 | int fd_flags; |
55 | ||
56 | switch (*mode++) | |
57 | { | |
58 | case 'r': | |
59 | read_write = _IO_NO_WRITES; | |
60 | break; | |
61 | case 'w': | |
62 | read_write = _IO_NO_READS; | |
63 | break; | |
64 | case 'a': | |
65 | posix_mode = O_APPEND; | |
66 | read_write = _IO_NO_READS|_IO_IS_APPENDING; | |
67 | break; | |
68 | default: | |
c4029823 | 69 | MAYBE_SET_EINVAL; |
96aa2d94 RM |
70 | return NULL; |
71 | } | |
72 | if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) | |
73 | read_write &= _IO_IS_APPENDING; | |
74 | #ifdef F_GETFL | |
75 | fd_flags = _IO_fcntl (fd, F_GETFL); | |
76 | #ifndef O_ACCMODE | |
77 | #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) | |
78 | #endif | |
79 | if (fd_flags == -1 | |
80 | || ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES)) | |
81 | || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS))) | |
82 | return NULL; | |
83 | ||
84 | /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b) | |
85 | [System Application Program Interface (API) Amendment 1: | |
86 | Realtime Extensions], Rationale B.8.3.3 | |
87 | Open a Stream on a File Descriptor says: | |
88 | ||
89 | Although not explicitly required by POSIX.1, a good | |
90 | implementation of append ("a") mode would cause the | |
91 | O_APPEND flag to be set. | |
92 | ||
93 | (Historical implementations [such as Solaris2] do a one-time | |
94 | seek in fdopen.) | |
95 | ||
96 | However, we do not turn O_APPEND off if the mode is "w" (even | |
97 | though that would seem consistent) because that would be more | |
98 | likely to break historical programs. | |
99 | */ | |
100 | if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND)) | |
101 | { | |
102 | #ifdef F_SETFL | |
103 | if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1) | |
104 | #endif | |
105 | return NULL; | |
106 | } | |
107 | #endif | |
108 | ||
edf5b2d7 UD |
109 | new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); |
110 | if (new_f == NULL) | |
96aa2d94 | 111 | return NULL; |
499e7464 | 112 | #ifdef _IO_MTSAFE_IO |
bd355af0 | 113 | new_f->fp.file._lock = &new_f->lock; |
499e7464 | 114 | #endif |
bd355af0 UD |
115 | _IO_init (&new_f->fp.file, 0); |
116 | _IO_JUMPS (&new_f->fp) = &_IO_file_jumps; | |
117 | _IO_file_init (&new_f->fp.file); | |
96aa2d94 | 118 | #if !_IO_UNIFIED_JUMPTABLES |
edf5b2d7 | 119 | new_f->fp.vtable = NULL; |
96aa2d94 | 120 | #endif |
bd355af0 | 121 | if (_IO_file_attach (&new_f->fp.file, fd) == NULL) |
96aa2d94 | 122 | { |
bd355af0 | 123 | _IO_un_link (&new_f->fp.file); |
edf5b2d7 | 124 | free (new_f); |
96aa2d94 RM |
125 | return NULL; |
126 | } | |
bd355af0 | 127 | new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE; |
96aa2d94 | 128 | |
bd355af0 UD |
129 | new_f->fp.file._IO_file_flags = |
130 | _IO_mask_flags (&new_f->fp.file, read_write, | |
96aa2d94 RM |
131 | _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); |
132 | ||
7ce241a0 | 133 | return &new_f->fp.file; |
96aa2d94 RM |
134 | } |
135 | ||
e1586792 | 136 | #if defined PIC && DO_VERSIONING |
bd355af0 UD |
137 | strong_alias (_IO_new_fdopen, __new_fdopen) |
138 | default_symbol_version (_IO_new_fdopen, _IO_fdopen, GLIBC_2.1); | |
139 | default_symbol_version (__new_fdopen, fdopen, GLIBC_2.1); | |
140 | #else | |
141 | # ifdef weak_alias | |
142 | weak_alias (_IO_new_fdopen, _IO_fdopen) | |
143 | weak_alias (_IO_new_fdopen, fdopen) | |
144 | # endif | |
ca34d7a7 | 145 | #endif |