close(2) close(2)
NAME [Toc] [Back]
close - close a file descriptor
SYNOPSIS [Toc] [Back]
#include <unistd.h>
int close(int fildes);
DESCRIPTION [Toc] [Back]
close() closes the file descriptor indicated by fildes. fildes is a
file descriptor obtained from a creat(), open(), dup(), fcntl(), or
pipe() system call. All associated file segments which have been
locked by this process with the lockf() function are released (i.e.,
unlocked).
RETURN VALUE [Toc] [Back]
Upon successful completion, close() returns a value of 0; otherwise,
it returns -1 and sets errno to indicate the error.
ERRORS [Toc] [Back]
close() fails if the any of following conditions are encountered:
[EBADF] fildes is not a valid open file descriptor.
[EINTR] An attempt to close a slow device or connection or
file with pending aio requests was interrupted by
a signal. The file descriptor still points to an
open device or connection or file.
[ENOSPC] Not enough space on the file system. This error
can occur when closing a file on an NFS file
system. [When a write() system call is executed
on a local file system and if a new buffer needs
to be allocated to hold the data, the buffer is
mapped onto the disk at that time. A full disk is
detected at this time and write() returns an
error. When the write() system call is executed
on an NFS file system, the new buffer is allocated
without communicating with the NFS server to see
if there is space for the buffer (to improve NFS
performance). It is only when the buffer is
written to the server (at file close or the buffer
is full) that the disk-full condition is
detected.]
SEE ALSO [Toc] [Back]
creat(2), dup(2), exec(2), fcntl(2), lockf(2), open(2), pipe(2),
thread_safety(5).
STANDARDS CONFORMANCE [Toc] [Back]
close(): AES, SVID2, SVID3, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: August 2003 [ Back ] |
