2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $FreeBSD: src/lib/libc_r/uthread/uthread_close.c,v 1.10.2.5 2003/06/13 16:04:59 ru Exp $
33 * $DragonFly: src/lib/libc_r/uthread/uthread_close.c,v 1.3 2006/08/01 08:25:58 corecode Exp $
41 #include "pthread_private.h"
49 struct fd_table_entry
*entry
;
51 if ((fd
< 0) || (fd
>= _thread_dtablesize
) ||
52 (fd
== _thread_kern_pipe
[0]) || (fd
== _thread_kern_pipe
[1])) {
54 * Don't allow silly programs to close the kernel pipe.
56 * Non-active descriptors are detected by _FD_LOCK below.
62 * Lock the file descriptor while the file is closed and get
63 * the file descriptor status:
65 else if (((ret
= _FD_LOCK(fd
, FD_RDWR
, NULL
)) == 0) &&
66 ((ret
= __sys_fstat(fd
, &sb
)) == 0)) {
68 * Check if the file should be left as blocking.
70 * This is so that the file descriptors shared with a parent
71 * process aren't left set to non-blocking if the child
72 * closes them prior to exit. An example where this causes
73 * problems with /bin/sh is when a child closes stdin.
75 * Setting a file as blocking causes problems if a threaded
76 * parent accesses the file descriptor before the child exits.
77 * Once the threaded parent receives a SIGCHLD then it resets
78 * all of its files to non-blocking, and so it is then safe
81 * Pipes are not set to blocking when they are closed, as
82 * the parent and child will normally close the file
83 * descriptor of the end of the pipe that they are not
84 * using, which would then cause any reads to block
87 if ((S_ISREG(sb
.st_mode
) || S_ISCHR(sb
.st_mode
))
88 && (_thread_fd_getflags(fd
) & O_NONBLOCK
) == 0) {
89 /* Get the current flags: */
90 flags
= __sys_fcntl(fd
, F_GETFL
, NULL
);
91 /* Clear the nonblocking file descriptor flag: */
92 __sys_fcntl(fd
, F_SETFL
, flags
& ~O_NONBLOCK
);
95 /* XXX: Assumes well behaved threads. */
96 /* XXX: Defer real close to avoid race condition */
97 entry
= _thread_fd_table
[fd
];
98 _thread_fd_table
[fd
] = NULL
;
101 /* Drop stale pthread stdio descriptor flags. */
103 _pthread_stdio_flags
[fd
] = -1;
105 /* Close the file descriptor: */
106 ret
= __sys_close(fd
);
116 _thread_enter_cancellation_point();
118 _thread_leave_cancellation_point();