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fcloseall(3) — Linux manual page

fcloseall(3)             Library Functions Manualfcloseall(3)

NAME        top

       fcloseall - close all open streams

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#define _GNU_SOURCE/* See feature_test_macros(7) */#include <stdio.h>int fcloseall(void);

DESCRIPTION        top

       Thefcloseall() function closes all of the calling process's open       streams.  Buffered output for each stream is written before it is       closed (as forfflush(3)); buffered input is discarded.       The standard streams,stdin,stdout, andstderr are also closed.

RETURN VALUE        top

       This function returns 0 if all files were successfully closed; on       error,EOFis returned.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌───────────────────────┬───────────────┬────────────────────────┐       │Interface│Attribute│Value│       ├───────────────────────┼───────────────┼────────────────────────┤       │fcloseall()           │ Thread safety │ MT-Unsafe race:streams │       └───────────────────────┴───────────────┴────────────────────────┘       Thefcloseall() function does not lock the streams, so it is not       thread-safe.

STANDARDS        top

       GNU.

SEE ALSO        top

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

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17fcloseall(3)

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