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fpurge(3)


NAME

   fpurge, __fpurge - purge a stream

SYNOPSIS

   /* unsupported */
   #include <stdio.h>

   int fpurge(FILE *stream);

   /* supported */
   #include <stdio.h>
   #include <stdio_ext.h>

   void  __fpurge(FILE *stream);

DESCRIPTION

   The  function  fpurge()  clears  the  buffers of the given stream.  For
   output streams this discards any unwritten output.  For  input  streams
   this  discards  any  input  read from the underlying object but not yet
   obtained via getc(3); this includes any text pushed back via ungetc(3).
   See also fflush(3).

   The  function __fpurge() does precisely the same, but without returning
   a value.

RETURN VALUE

   Upon successful completion fpurge() returns 0.  On error, it returns -1
   and sets errno appropriately.

ERRORS

   EBADF  stream is not an open stream.

ATTRIBUTES

   For   an   explanation   of   the  terms  used  in  this  section,  see
   attributes(7).

   
   Interface   Attribute      Value               
   
   __fpurge()  Thread safety  MT-Safe race:stream

CONFORMING TO

   These  functions  are  nonstandard  and  not  portable.   The  function
   fpurge()  was  introduced  in  4.4BSD and is not available under Linux.
   The function __fpurge() was introduced in Solaris, and  is  present  in
   glibc 2.1.95 and later.

NOTES

   Usually it is a mistake to want to discard input buffers.

SEE ALSO

   fflush(3), setbuf(3), stdio_ext(3)

COLOPHON

   This  page  is  part of release 4.09 of the Linux man-pages project.  A
   description of the project, information about reporting bugs,  and  the
   latest     version     of     this    page,    can    be    found    at
   https://www.kernel.org/doc/man-pages/.

                              2015-07-23                         FPURGE(3)



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