2 * This Cplant(TM) source code is the property of Sandia National
5 * This Cplant(TM) source code is copyrighted by Sandia National
8 * The redistribution of this Cplant(TM) source code is subject to the
9 * terms of the GNU Lesser General Public License
10 * (see cit/LGPL or http://www.gnu.org/licenses/lgpl.html)
12 * Cplant(TM) Copyright 1998-2003 Sandia Corporation.
13 * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
14 * license for use of this work by or on behalf of the US Government.
15 * Export of this program may require a license from the United States
20 * This library is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU Lesser General Public
22 * License as published by the Free Software Foundation; either
23 * version 2.1 of the License, or (at your option) any later version.
25 * This library is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
28 * Lesser General Public License for more details.
30 * You should have received a copy of the GNU Lesser General Public
31 * License along with this library; if not, write to the Free Software
32 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
34 * Questions or comments about this library should be sent to:
37 * Sandia National Laboratories, New Mexico
39 * Albuquerque, NM 87185-1110
47 #include <sys/types.h>
48 #include <sys/queue.h>
56 * Support for file IO.
60 * The open files table and it's size.
62 static struct file **_sysio_oftab = NULL;
63 static size_t _sysio_oftab_size = 0;
66 * Create and initialize open file record.
69 _sysio_fnew(struct inode *ino, int flags)
73 fil = malloc(sizeof(struct file));
77 _SYSIO_FINIT(fil, ino, flags);
84 * Destroy open file record.
87 _sysio_fgone(struct file *fil)
93 err = (*fil->f_ino->i_ops.inop_close)(fil->f_ino);
99 * IO operation completion handler.
102 _sysio_fcompletio(struct ioctx *ioctx, struct file *fil)
106 if (ioctx->ioctx_cc <= 0)
109 assert(ioctx->ioctx_ino == fil->f_ino);
110 off = fil->f_pos + ioctx->ioctx_cc;
111 if (fil->f_pos && off <= fil->f_pos)
117 * Grow (or truncate) the file descriptor table.
124 struct file **noftab, **filp;
127 * Sanity check the new size.
130 if ((size_t )fd != n)
135 if (n >= _sysio_oftab_size && n - _sysio_oftab_size < _sysio_oftab_size)
137 noftab = realloc(_sysio_oftab, n * sizeof(struct file *));
140 _sysio_oftab = noftab;
141 count = _sysio_oftab_size;
142 _sysio_oftab_size = n;
145 filp = _sysio_oftab + count;
158 _sysio_oftab_size = 0;
163 * Find a free slot in the open files table.
172 for (n = 0, filp = _sysio_oftab;
173 n < _sysio_oftab_size && *filp;
176 if (n >= _sysio_oftab_size) {
180 filp = &_sysio_oftab[n];
188 * Find open file record from file descriptor.
191 _sysio_fd_find(int fd)
193 if (fd < 0 || (unsigned )fd >= _sysio_oftab_size)
196 return _sysio_oftab[fd];
200 * Close an open descriptor.
203 _sysio_fd_close(int fd)
207 fil = _sysio_fd_find(fd);
211 _sysio_oftab[fd] = NULL;
219 * Associate open file record with given file descriptor or any available
220 * file descriptor if less than zero.
223 _sysio_fd_set(struct file *fil, int fd)
229 * New fd < 0 => any available descriptor.
232 fd = find_free_fildes();
237 if ((unsigned )fd >= _sysio_oftab_size) {
246 ofil = _sysio_fd_find(fd);
250 _sysio_oftab[fd] = fil;
258 * Duplicate old file descriptor.
260 * If the new file descriptor is less than zero, the new file descriptor
264 _sysio_fd_dup2(int oldfd, int newfd)
272 fil = _sysio_fd_find(oldfd);
276 fd = _sysio_fd_set(fil, newfd);
283 _sysio_fd_close_all()
289 * Close all open descriptors.
291 for (fd = 0, filp = _sysio_oftab;
292 (size_t )fd < _sysio_oftab_size;
301 * Release current working directory.