fclose
Section: C Library Functions (3)
Updated: 2022-12-29
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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
POSIX.1-2001, POSIX.1-2008, C99.
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)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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