Novell Doc: NDK: Libraries for C (LibC), Volume 1

Syntax

  #include <stdio.h> 
   
  int fflush (
     FILE   *fp);

If successful, returns 0. Otherwise, returns nonzero and sets errno to one of the following:

Decimal	Constant	Description
4	EBADF	The file descriptor is not valid.
12	ENOSPC	No free space remains on the device containing the file.
24	EAGAIN	The O_NONBLOCK flag is set for the file descriptor, and the process cannot immediately perform the write operation.
25	ENXIO	A request was made of a nonexistent device, or the request was outside the capabilities of the device.
28	EIO	The process is orphaned and cannot write to the file.
32	EPIPE	An attempt is made to write to a pipe or FIFO that is not open for reading by any process.
63	EINTR	A signal interrupted the fflush function.
71	EFBIG	An attempt was made to write a file that exceeds the maximum file size.

If the file pointed to by fp is open for output or update, the fflush function causes any unwritten data to be written to the file.

If the file pointed to by fp is open for input or update, the fflush function undoes the effect of any preceding ungetc operation on the stream.

If the value of fp is NULL, all open files are flushed.