1 /* Retrieve information about a FILE stream.
2 Copyright (C) 2007-2013 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "freadable.h"
22 #include "stdio-impl.h"
24 #if defined EPLAN9 /* Plan9 */
31 /* Most systems provide FILE as a struct and the necessary bitmask in
32 <stdio.h>, because they need it for implementing getc() and putc() as
34 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
35 return (fp->_flags & _IO_NO_READS) == 0;
36 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
37 return (fp_->_flags & (__SRW | __SRD)) != 0;
38 #elif defined __EMX__ /* emx+gcc */
39 return (fp->_flags & (_IORW | _IOREAD)) != 0;
40 #elif defined __minix /* Minix */
41 return (fp->_flags & _IOREAD) != 0;
42 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
43 return (fp->_flag & (_IORW | _IOREAD)) != 0;
44 #elif defined __QNX__ /* QNX */
45 return (fp->_Mode & 0x1 /* _MOPENR */) != 0;
46 #elif defined __MINT__ /* Atari FreeMiNT */
47 return fp->__mode.__read;
48 #elif defined EPLAN9 /* Plan9 */
52 int flags = fcntl (fd, F_GETFL, NULL);
56 return (flags == O_RDONLY || flags == O_RDWR);
61 # error "Please port gnulib freadable.c to your platform! Look at the definition of fopen, fdopen on your system, then report this to bug-gnulib."