|Linux & Unix Commands - Search Man Pages
CLOSE(2) Linux Programmer's Manual CLOSE(2)
close - close a file descriptor
int close(int fd);
close 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).
If fd 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 removed using
unlink(2) the file is deleted.
close returns zero on success, or -1 if an error occurred.
EBADF fd isn't a valid open file descriptor.
EINTR The close() call was interrupted by a signal.
EIO 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 previous write(2) operation are first
reported at the final close. 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
fsync(2). (It will depend on the disk hardware at this point.)
open(2), fcntl(2), shutdown(2), unlink(2), fclose(3), fsync(2)
All times are GMT -4. The time now is 08:06 PM.