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[pspp] / lib / stdio_.h

diff --git a/lib/stdio_.h b/lib/stdio_.h
index 2b920fcd2e5db8472efd96d13407e4f69afee77c..a8290ac3a39c4bf10f4dd19f34504201492daef6 100644 (file)
--- a/lib/stdio_.h
+++ b/lib/stdio_.h
@@ -270,7 +270,11 @@ extern off_t ftello (FILE *fp);
 # if @REPLACE_FFLUSH@
 #  define fflush rpl_fflush
   /* Flush all pending data on STREAM according to POSIX rules.  Both
-     output and seekable input streams are supported.  */
+     output and seekable input streams are supported.
+     Note! LOSS OF DATA can occur if fflush is applied on an input stream
+     that is _not_seekable_ or on an update stream that is _not_seekable_
+     and in which the most recent operation was input.  Seekability can
+     be tested with lseek(fileno(fp),0,SEEK_CUR).  */
   extern int fflush (FILE *gl_stream);
 # endif
 #elif defined GNULIB_POSIXCHECK