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fflush(3s) [bsd man page]

FCLOSE(3S)																FCLOSE(3S)

fclose, fflush - close or flush a stream SYNOPSIS
#include <stdio.h> fclose(stream) FILE *stream; fflush(stream) FILE *stream; DESCRIPTION
Fclose causes any buffers for the named stream to be emptied, and the file to be closed. Buffers allocated by the standard input/output system are freed. Fclose is performed automatically upon calling exit(3). Fflush causes any buffered data for the named output stream to be written to that file. The stream remains open. SEE ALSO
close(2), fopen(3S), setbuf(3S) DIAGNOSTICS
These routines return EOF if stream is not associated with an output file, or if buffered data cannot be transferred to that file. 7th Edition May 15, 1985 FCLOSE(3S)

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

fclose - close a stream SYNOPSIS
#include <stdio.h> int fclose(FILE *stream); DESCRIPTION
The fclose function dissociates the named stream from its underlying file or set of functions. If the stream was being used for output, any buffered data is written first, using fflush(3). RETURN VALUE
Upon successful completion 0 is returned. Otherwise, EOF is returned and the global variable errno is set to indicate the error. In either case any further access (including another call to fclose()) to the stream results in undefined behaviour. ERRORS
EBADF The filedescriptor 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). NOTES
Note that fclose only flushes 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, e.g. with sync(2) or fsync(2). CONFORMING TO
The fclose function conforms to ANSI X3.159-1989 (``ANSI C''). SEE ALSO
close(2), fcloseall(3), fflush(3), fopen(3), setbuf(3) BSD MANPAGE
1993-11-29 FCLOSE(3)
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