Guardian C Library Calls Reference Manual

Reference to Library Calls

Guardian TNS C Library Calls Reference Manual—128833 3-41

fflush

The fflush function writes to disk any data that is in the buffer of a file opened for

ANSI I/O.

stream

denotes a file opened for ANSI I/O.

Return Value

is zero if the operation is successful or nonzero if an error occurs.

Usage Guidelines

•

If you pass NULL as the argument to fflush, the C compiler flushes all files

currently opened for ANSI I/O.

•

In C-series releases, the fflush function can flush partial lines if stdout and stderr are

directed to type 101 Edit files. In D-series releases, the fflush function does not flush

partial lines if stdout and stderr are directed to type 101 Edit tiles because these files

are shared resources under the CRE.

In D-series releases, to flush partial lines to the stdout and stderr files, you must

either open the files using freopen or close and reopen the files using fopen. In both

cases, these files cannot be shared.

Example

This example writes all buffered data for the file $a.b.c to disk:

#include <stdioh>

FILE *fp;

fp = fopen("$a.b.c", "a");

/* ... */

fflush(fp);

#include <stdioh>

int fflush(FILE *stream);