Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
CLOSE(2)		   Linux Programmer's Manual		      CLOSE(2)

NAME
       close - close a file descriptor

SYNOPSIS
       #include	<unistd.h>

       int close(int fd);

DESCRIPTION
       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 descrip-
       tor 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.

RETURN VALUE
       close returns zero on success, or -1 if an error	occurred.

ERRORS
       EBADF  fd isn't a valid open file descriptor.

       EINTR  The close() call was interrupted by a signal.

       EIO    An I/O error occurred.

CONFORMING TO
       SVr4, SVID, POSIX, X/OPEN, BSD 4.3.  SVr4 documents an additional  ENO-
       LINK error condition.

NOTES
       Not  checking  the  return  value of close is a common but nevertheless
       serious programming error.  It is quite possible	that errors on a  pre-
       vious  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 success-
       fully 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.)

SEE ALSO
       open(2),	fcntl(2), shutdown(2), unlink(2), fclose(3), fsync(2)

				  2001-12-13			      CLOSE(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=close&sektion=2&manpath=Red+Hat+9>

home | help