close - close a file descriptor
int close(int fd);
closes a file descriptor, so that it no longer refers to any file and
may be reused. Any locks held on the file it was associated with,
and owned by the process, are removed (regardless of the file
descriptor that was used to obtain the lock).
is the last copy of a particular file descriptor the resources
associated with it are freed;
if the descriptor was the last reference to a file which has been
the file is deleted.
returns zero on success, or -1 if an error occurred.
isn't a valid open file descriptor.
call was interrupted by a signal.
An I/O error occurred.
SVr4, SVID, POSIX, X/OPEN, BSD 4.3. SVr4 documents an additional
ENOLINK error condition.
Not checking the return value of close is a common but nevertheless
serious programming error. It is quite possible that errors on a
operation are first reported at the final
Not checking the return value when closing the file may lead to
silent loss of data. This can especially be observed with NFS
and disk quotas.
A successful close does not guarantee that the data has been successfully
saved to disk, as the kernel defers writes. It is not common for a filesystem
to flush the buffers when the stream is closed. If you need to be sure that
the data is physically stored use
(It will depend on the disk hardware at this point.)
- RETURN VALUE
- CONFORMING TO
- SEE ALSO