Updated to fedora-glibc-20071212T1051
[glibc.git] / libio / oldiofdopen.c
blobc616b387fa47de38c91c2f7e37fd6e3ccfab439d
1 /* Copyright (C) 1993,94,97,99,2000,2002,2003,2004
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA.
20 As a special exception, if you link the code in this file with
21 files compiled with a GNU compiler to produce an executable,
22 that does not cause the resulting executable to be covered by
23 the GNU Lesser General Public License. This exception does not
24 however invalidate any other reasons why the executable file
25 might be covered by the GNU Lesser General Public License.
26 This exception applies to code released by its copyright holders
27 in files containing the exception. */
29 #include <shlib-compat.h>
30 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
32 #define _IO_USE_OLD_IO_FILE
33 #ifdef __STDC__
34 # include <stdlib.h>
35 #endif
36 #include "libioP.h"
37 #include <fcntl.h>
39 #ifndef _IO_fcntl
40 # define _IO_fcntl __fcntl
41 #endif
43 _IO_FILE *
44 attribute_compat_text_section
45 _IO_old_fdopen (fd, mode)
46 int fd;
47 const char *mode;
49 int read_write;
50 int posix_mode = 0;
51 struct locked_FILE
53 struct _IO_FILE_complete_plus fp;
54 #ifdef _IO_MTSAFE_IO
55 _IO_lock_t lock;
56 #endif
57 } *new_f;
58 int fd_flags;
60 switch (*mode++)
62 case 'r':
63 read_write = _IO_NO_WRITES;
64 break;
65 case 'w':
66 read_write = _IO_NO_READS;
67 break;
68 case 'a':
69 posix_mode = O_APPEND;
70 read_write = _IO_NO_READS|_IO_IS_APPENDING;
71 break;
72 default:
73 MAYBE_SET_EINVAL;
74 return NULL;
76 if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))
77 read_write &= _IO_IS_APPENDING;
78 #ifdef F_GETFL
79 fd_flags = _IO_fcntl (fd, F_GETFL);
80 #ifndef O_ACCMODE
81 #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
82 #endif
83 if (fd_flags == -1
84 || ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES))
85 || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS)))
86 return NULL;
88 /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b)
89 [System Application Program Interface (API) Amendment 1:
90 Realtime Extensions], Rationale B.8.3.3
91 Open a Stream on a File Descriptor says:
93 Although not explicitly required by POSIX.1, a good
94 implementation of append ("a") mode would cause the
95 O_APPEND flag to be set.
97 (Historical implementations [such as Solaris2] do a one-time
98 seek in fdopen.)
100 However, we do not turn O_APPEND off if the mode is "w" (even
101 though that would seem consistent) because that would be more
102 likely to break historical programs.
104 if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND))
106 #ifdef F_SETFL
107 if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1)
108 #endif
109 return NULL;
111 #endif
113 new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
114 if (new_f == NULL)
115 return NULL;
116 #ifdef _IO_MTSAFE_IO
117 new_f->fp.file._file._lock = &new_f->lock;
118 #endif
119 _IO_old_init (&new_f->fp.file._file, 0);
120 _IO_JUMPS ((struct _IO_FILE_plus *) &new_f->fp) = &_IO_old_file_jumps;
121 _IO_old_file_init ((struct _IO_FILE_plus *) &new_f->fp);
122 #if !_IO_UNIFIED_JUMPTABLES
123 new_f->fp.vtable = NULL;
124 #endif
125 if (_IO_old_file_attach (&new_f->fp.file._file, fd) == NULL)
127 INTUSE(_IO_un_link) ((struct _IO_FILE_plus *) &new_f->fp);
128 free (new_f);
129 return NULL;
131 new_f->fp.file._file._flags &= ~_IO_DELETE_DONT_CLOSE;
133 new_f->fp.file._file._IO_file_flags =
134 _IO_mask_flags (&new_f->fp.file._file, read_write,
135 _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
137 return (_IO_FILE *) &new_f->fp;
140 strong_alias (_IO_old_fdopen, __old_fdopen)
141 compat_symbol (libc, _IO_old_fdopen, _IO_fdopen, GLIBC_2_0);
142 compat_symbol (libc, __old_fdopen, fdopen, GLIBC_2_0);
144 #endif