fcloseall(3)		    Library Functions Manual		    fcloseall(3)

NAME
     fcloseall - close all open streams

LIBRARY
     Standard C library (libc, -lc)

SYNOPSIS
     #define _GNU_SOURCE	 /* See feature_test_macros(7) */
     #include <stdio.h>

     int fcloseall(void);

DESCRIPTION
     The  fcloseall() function closes all of the calling process's open streams.
     Buffered output for each stream is written before	it  is	closed	(as  for
     fflush(3)); buffered input is discarded.

     The standard streams, stdin, stdout, and stderr are also closed.

RETURN VALUE
     This  function  returns  0 if all files were successfully closed; on error,
     EOF is returned.

ATTRIBUTES
     For an explanation of the terms used in this  section,  see  attributes(7).
     allbox; lbx lb lb l l l.  Interface Attribute Value T{ fcloseall()
     T}	  Thread safety	  MT-Unsafe race:streams

     The  fcloseall()  function	 does not lock the streams, so it is not thread-
     safe.

STANDARDS
     GNU.

SEE ALSO
     close(2), fclose(3), fflush(3), fopen(3), setbuf(3)

Linux man-pages 6.18		   2026-02-08			    fcloseall(3)