FCLOSEALL(3)                                                            Linux Programmer's Manual                                                           FCLOSEALL(3)

NAME
       fcloseall - close all open streams

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).

       ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬────────────────────────┐
       │Interface                                                                                                              │ Attribute     │ Value                  │
       ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼────────────────────────┤
       │fcloseall()                                                                                                            │ Thread safety │ MT-Unsafe race:streams │
       └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴────────────────────────┘

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

CONFORMING TO
       This function is a GNU extension.

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

GNU                                                                            2021-03-22                                                                   FCLOSEALL(3)