mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
9233c4d942
just use _foo() <-- foo(). In the case of a libpthread that doesn't do call conversion (such as linuxthreads and our upcoming libpthread), this is adequate. In the case of libc_r, we still need three names, which are now _thread_sys_foo() <-- _foo() <-- foo(). Convert all internal libc usage of: aio_suspend(), close(), fsync(), msync(), nanosleep(), open(), fcntl(), read(), and write() to _foo() instead of foo(). Remove all internal libc usage of: creat(), pause(), sleep(), system(), tcdrain(), wait(), and waitpid(). Make thread cancellation fully POSIX-compliant. Suggested by: deischen
115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by John Birrell.
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#ifdef _THREAD_SAFE
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
int
|
|
_close(int fd)
|
|
{
|
|
int flags;
|
|
int ret;
|
|
struct stat sb;
|
|
struct fd_table_entry *entry;
|
|
|
|
if ((fd == _thread_kern_pipe[0]) || (fd == _thread_kern_pipe[1])) {
|
|
/*
|
|
* Don't allow silly programs to close the kernel pipe.
|
|
*/
|
|
errno = EBADF;
|
|
ret = -1;
|
|
}
|
|
/*
|
|
* Lock the file descriptor while the file is closed and get
|
|
* the file descriptor status:
|
|
*/
|
|
else if (((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) &&
|
|
((ret = _thread_sys_fstat(fd, &sb)) == 0)) {
|
|
/*
|
|
* Check if the file should be left as blocking.
|
|
*
|
|
* This is so that the file descriptors shared with a parent
|
|
* process aren't left set to non-blocking if the child
|
|
* closes them prior to exit. An example where this causes
|
|
* problems with /bin/sh is when a child closes stdin.
|
|
*
|
|
* Setting a file as blocking causes problems if a threaded
|
|
* parent accesses the file descriptor before the child exits.
|
|
* Once the threaded parent receives a SIGCHLD then it resets
|
|
* all of its files to non-blocking, and so it is then safe
|
|
* to access them.
|
|
*
|
|
* Pipes are not set to blocking when they are closed, as
|
|
* the parent and child will normally close the file
|
|
* descriptor of the end of the pipe that they are not
|
|
* using, which would then cause any reads to block
|
|
* indefinitely.
|
|
*/
|
|
if ((S_ISREG(sb.st_mode) || S_ISCHR(sb.st_mode)) && (_thread_fd_table[fd]->flags & O_NONBLOCK) == 0) {
|
|
/* Get the current flags: */
|
|
flags = _thread_sys_fcntl(fd, F_GETFL, NULL);
|
|
/* Clear the nonblocking file descriptor flag: */
|
|
_thread_sys_fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
|
|
}
|
|
|
|
/* XXX: Assumes well behaved threads. */
|
|
/* XXX: Defer real close to avoid race condition */
|
|
entry = _thread_fd_table[fd];
|
|
_thread_fd_table[fd] = NULL;
|
|
free(entry);
|
|
|
|
/* Close the file descriptor: */
|
|
ret = _thread_sys_close(fd);
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
close(int fd)
|
|
{
|
|
int ret;
|
|
|
|
_thread_enter_cancellation_point();
|
|
ret = _close(fd);
|
|
_thread_leave_cancellation_point();
|
|
|
|
return ret;
|
|
}
|
|
#endif
|