Linux / Unix Command: fflush

Command Library

NAME

fflush - flush a stream  

SYNOPSIS

#include <stdio.h>

int fflush(FILE *stream);  

DESCRIPTION

The function fflush forces a write of all user-space buffered data for the given output or update stream via the stream's underlying write function. The open status of the stream is unaffected.

If the stream argument is NULL, fflush flushes all open output streams.

For a non-locking counterpart, see unlocked_stdio(3).  

RETURN VALUE

Upon successful completion 0 is returned. Otherwise, EOF is returned and the global variable errno is set to indicate the error.  

ERRORS

EBADF

Stream is not an open stream, or is not open for writing.

The function fflush may also fail and set errno for any of the errors specified for the routine write(2).  

SEE ALSO

fsync(2), sync(2), write(2), fclose(3), fopen(3), setbuf(3), unlocked_stdio(3)

---

Important: Use the man command (% man) to see how a command is used on your particular computer.

>> Linux/Unix Command Library

>> Shell Command Library