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annotate lib/freadable.c @ 17426:90f3d53e01f5

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sig2str: port to C++ * lib/sig2str.h (sig2str, str2sig): Declare as extern "C". Reported by Daniel J Sebald in <http://lists.gnu.org/archive/html/bug-gnulib/2013-06/msg00000.html>.
author Paul Eggert <eggert@cs.ucla.edu>
date Sun, 02 Jun 2013 11:52:41 -0700
parents e542fd46ad6f
children
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1 /* Retrieve information about a FILE stream.
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2 Copyright (C) 2007-2013 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include "freadable.h"
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21
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22 #include "stdio-impl.h"
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23
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24 #if defined EPLAN9 /* Plan9 */
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25 # include <fcntl.h>
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26 #endif
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27
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28 bool
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29 freadable (FILE *fp)
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30 {
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31 /* Most systems provide FILE as a struct and the necessary bitmask in
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32 <stdio.h>, because they need it for implementing getc() and putc() as
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33 fast macros. */
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34 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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35 return (fp->_flags & _IO_NO_READS) == 0;
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36 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
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37 return (fp_->_flags & (__SRW | __SRD)) != 0;
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38 #elif defined __EMX__ /* emx+gcc */
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39 return (fp->_flags & (_IORW | _IOREAD)) != 0;
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40 #elif defined __minix /* Minix */
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41 return (fp->_flags & _IOREAD) != 0;
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42 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
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43 return (fp->_flag & (_IORW | _IOREAD)) != 0;
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44 #elif defined __QNX__ /* QNX */
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45 return (fp->_Mode & 0x1 /* _MOPENR */) != 0;
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46 #elif defined __MINT__ /* Atari FreeMiNT */
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47 return fp->__mode.__read;
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48 #elif defined EPLAN9 /* Plan9 */
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49 int fd = fp->fd;
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50 if (fd >= 0)
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51 {
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52 int flags = fcntl (fd, F_GETFL, NULL);
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53 if (flags >= 0)
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54 {
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55 flags &= O_ACCMODE;
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56 return (flags == O_RDONLY || flags == O_RDWR);
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57 }
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58 }
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59 return 0;
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60 #else
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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."
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62 #endif
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63 }