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fclose(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|ATTRIBUTES \|STANDARDS \|HISTORY \|NOTES \|SEE ALSO \|COLOPHON

fclose(3)                Library Functions Manualfclose(3)

NAME top

       fclose - close a stream

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <stdio.h>int fclose(FILE *stream);

DESCRIPTION top

       Thefclose() function flushes the stream pointed to bystream       (writing any buffered output data usingfflush(3)) and closes the       underlying file descriptor.

RETURN VALUE top

       Upon successful completion, 0 is returned.  Otherwise,EOFis       returned anderrno is set to indicate the error.  In either case,       any further access (including another call tofclose()) to the       stream results in undefined behavior.

ERRORS top

EBADFThe file descriptor underlyingstream is not valid.       Thefclose() function may also fail and seterrno for any of the       errors specified for the routinesclose(2),write(2), orfflush(3).

ATTRIBUTES top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │fclose()                             │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

       C11, POSIX.1-2008.

HISTORY top

       C89, POSIX.1-2001.

NOTES top

       Note thatfclose() flushes only the user-space buffers provided by       the C library.  To ensure that the data is physically stored on       disk the kernel buffers must be flushed too, for example, withsync(2) orfsync(2).

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            2025-05-17fclose(3)

Pages that refer to this page:close(2), abort(3), fcloseall(3), fflush(3), FILE(3type), fileno(3), fmemopen(3), fopen(3), fopencookie(3), getmntent(3), open_memstream(3), popen(3), setbuf(3), stdio(3), xdr(3)