int fclose(FILE *stream);
The fclose() function causes the stream pointed to by stream to be
flushed and the associated file to be closed. Any unwritten buffered data for
the stream is written to the file; any unread buffered data is discarded. The
stream is disassociated from the file. If the associated buffer was
automatically allocated, it is deallocated.
The fclose() function marks for update the st_ctime
and st_mtime fields of the underlying file if the stream is writable
and if buffered data has not yet been written to the file. It will perform a
close(2) operation on the file descriptor that is associated with the
stream pointed to by stream.
After the call to fclose(), any use of stream causes
The fclose() function is performed automatically for all
open files upon calling exit(2).
Upon successful completion, fclose() returns 0. Otherwise, it
returns EOF and sets errno to indicate the error.
The fclose() function will fail if:
The O_NONBLOCK flag is set for the file descriptor
underlying stream and the process would be delayed in the write
The file descriptor underlying stream is not valid.
An attempt was made to write a file that exceeds the
maximum file size or the process's file size limit; or the file is a regular
file and an attempt was made to write at or beyond the offset maximum
associated with the corresponding stream.
The fclose() function was interrupted by a
The process is a member of a background process group
attempting to write to its controlling terminal, TOSTOP
is set, the
process is neither ignoring nor blocking SIGTTOU
and the process group
of the process is orphaned. stream
was created by
and a wide-character or byte sequence buffered is
invalid in the current locale.
There was no free space remaining on the device
containing the file.
An attempt is made to write to a pipe or FIFO that
is not open for reading by any process. A SIGPIPE signal will also be
sent to the calling thread.
The fclose() function may fail if:
A request was made of a non-existent device, or the
request was beyond the limits of the device.
See attributes(7) for descriptions of the following attributes: