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[glibc.git] / libio / oldiofdopen.c
blobe9c18d932b5bc672eb3f6916c1bbc34b4821d345
1 /* Copyright (C) 1993, 1994, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU IO Library.
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.
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.
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.
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. */
26 #define _IO_USE_OLD_IO_FILE
27 #ifdef __STDC__
28 #include <stdlib.h>
29 #endif
30 #include "libioP.h"
31 #include <fcntl.h>
33 #ifndef _IO_fcntl
34 #define _IO_fcntl fcntl
35 #endif
37 _IO_FILE *
38 _IO_old_fdopen (fd, mode)
39 int fd;
40 const char *mode;
42 int read_write;
43 int posix_mode = 0;
44 struct locked_FILE
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;
53 switch (*mode++)
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;
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;
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:
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.
90 (Historical implementations [such as Solaris2] do a one-time
91 seek in fdopen.)
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.
97 if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND))
99 #ifdef F_SETFL
100 if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1)
101 #endif
102 return NULL;
104 #endif
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)
120 _IO_un_link (&new_f->fp.file);
121 free (new_f);
122 return NULL;
124 new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE;
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);
130 return (_IO_FILE *) &new_f->fp;
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);