X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffwritable.c;h=0b53927ab5ac455777f98da03030c3a31a556aa6;hb=4779b635ef35c7b0bc4044fcb5bc746d06f158c4;hp=04bc97c5b90ed9fa8618a9e34ef83e3e11c93b4e;hpb=75fb803d0df021f3983da81735094adce7dd3009;p=gnulib.git

diff --git a/lib/fwritable.c b/lib/fwritable.c
index 04bc97c5b..0b53927ab 100644
--- a/lib/fwritable.c
+++ b/lib/fwritable.c
@@ -1,5 +1,5 @@
 /* Retrieve information about a FILE stream.
-   Copyright (C) 2007-2011 Free Software Foundation, Inc.
+   Copyright (C) 2007-2013 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -21,6 +21,10 @@
 
 #include "stdio-impl.h"
 
+#if defined EPLAN9                  /* Plan9 */
+# include <fcntl.h>
+#endif
+
 bool
 fwritable (FILE *fp)
 {
@@ -29,16 +33,30 @@ fwritable (FILE *fp)
      fast macros.  */
 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
   return (fp->_flags & _IO_NO_WRITES) == 0;
-#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
   return (fp_->_flags & (__SRW | __SWR)) != 0;
 #elif defined __EMX__               /* emx+gcc */
   return (fp->_flags & (_IORW | _IOWRT)) != 0;
+#elif defined __minix               /* Minix */
+  return (fp->_flags & _IOWRITE) != 0;
 #elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
   return (fp->_flag & (_IORW | _IOWRT)) != 0;
 #elif defined __QNX__               /* QNX */
   return (fp->_Mode & 0x2 /* _MOPENW */) != 0;
 #elif defined __MINT__              /* Atari FreeMiNT */
   return fp->__mode.__write;
+#elif defined EPLAN9                /* Plan9 */
+  int fd = fp->fd;
+  if (fd >= 0)
+    {
+      int flags = fcntl (fd, F_GETFL, NULL);
+      if (flags >= 0)
+        {
+          flags &= O_ACCMODE;
+          return (flags == O_WRONLY || flags == O_RDWR);
+        }
+    }
+  return 0;
 #else
 # error "Please port gnulib fwritable.c to your platform! Look at the definition of fopen, fdopen on your system, then report this to bug-gnulib."
 #endif