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NAME
fclose - close a stream
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <stdio.h>
int fclose(FILE *stream);
DESCRIPTION
The fclose() function flushes the stream pointed to by stream (writing any buffered output data using
fflush(3)) and closes the underlying file descriptor.
The behaviour of fclose() is undefined if the stream parameter is an illegal pointer, or is a descriptor
already passed to a previous invocation of fclose().
RETURN VALUE
Upon successful completion, 0 is returned. Otherwise, EOF is returned and errno is set to indicate the
error. In either case, any further access (including another call to fclose()) to the stream results in
undefined behavior.
ERRORS
EBADF The file descriptor underlying stream is not valid.
The fclose() function may also fail and set errno for any of the errors specified for the routines
close(2), write(2), or fflush(3).
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
│ fclose() │ Thread safety │ MT-Safe │
└─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
C11, POSIX.1-2008.
HISTORY
C89, POSIX.1-2001.
NOTES
Note that fclose() 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, with sync(2) or
fsync(2).
SEE ALSO
close(2), fcloseall(3), fflush(3), fileno(3), fopen(3), setbuf(3)
Linux man-pages 6.9.1 2024-05-02 fclose(3)