1 /* Copyright (C) 1993-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>.
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. */
32 # include <shlib-compat.h>
37 #define _IO_fcntl __fcntl
39 #define _IO_fcntl fcntl
44 _IO_new_fdopen (fd
, mode
)
52 struct _IO_FILE_plus fp
;
56 struct _IO_wide_data wd
;
65 read_write
= _IO_NO_WRITES
;
68 read_write
= _IO_NO_READS
;
71 posix_mode
= O_APPEND
;
72 read_write
= _IO_NO_READS
|_IO_IS_APPENDING
;
78 for (i
= 1; i
< 5; ++i
)
85 read_write
&= _IO_IS_APPENDING
;
99 fd_flags
= _IO_fcntl (fd
, F_GETFL
);
101 #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
106 if (((fd_flags
& O_ACCMODE
) == O_RDONLY
&& !(read_write
& _IO_NO_WRITES
))
107 || ((fd_flags
& O_ACCMODE
) == O_WRONLY
&& !(read_write
& _IO_NO_READS
)))
113 /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b)
114 [System Application Program Interface (API) Amendment 1:
115 Realtime Extensions], Rationale B.8.3.3
116 Open a Stream on a File Descriptor says:
118 Although not explicitly required by POSIX.1, a good
119 implementation of append ("a") mode would cause the
120 O_APPEND flag to be set.
122 (Historical implementations [such as Solaris2] do a one-time
125 However, we do not turn O_APPEND off if the mode is "w" (even
126 though that would seem consistent) because that would be more
127 likely to break historical programs.
129 if ((posix_mode
& O_APPEND
) && !(fd_flags
& O_APPEND
))
132 if (_IO_fcntl (fd
, F_SETFL
, fd_flags
| O_APPEND
) == -1)
138 new_f
= (struct locked_FILE
*) malloc (sizeof (struct locked_FILE
));
142 new_f
->fp
.file
._lock
= &new_f
->lock
;
144 _IO_no_init (&new_f
->fp
.file
, 0, 0, &new_f
->wd
,
146 (use_mmap
&& (read_write
& _IO_NO_WRITES
))
147 ? &_IO_wfile_jumps_maybe_mmap
:
150 _IO_JUMPS (&new_f
->fp
) =
152 (use_mmap
&& (read_write
& _IO_NO_WRITES
)) ? &_IO_file_jumps_maybe_mmap
:
155 _IO_file_init (&new_f
->fp
);
156 #if !_IO_UNIFIED_JUMPTABLES
157 new_f
->fp
.vtable
= NULL
;
159 /* We only need to record the fd because _IO_file_init will have unset the
160 offset. It is important to unset the cached offset because the real
161 offset in the file could change between now and when the handle is
162 activated and we would then mislead ftell into believing that we have a
164 new_f
->fp
.file
._fileno
= fd
;
165 new_f
->fp
.file
._flags
&= ~_IO_DELETE_DONT_CLOSE
;
167 _IO_mask_flags (&new_f
->fp
.file
, read_write
,
168 _IO_NO_READS
+_IO_NO_WRITES
+_IO_IS_APPENDING
);
170 return &new_f
->fp
.file
;
172 libc_hidden_ver (_IO_new_fdopen
, _IO_fdopen
)
174 strong_alias (_IO_new_fdopen
, __new_fdopen
)
175 versioned_symbol (libc
, _IO_new_fdopen
, _IO_fdopen
, GLIBC_2_1
);
176 versioned_symbol (libc
, __new_fdopen
, fdopen
, GLIBC_2_1
);