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>
55 * Support for file IO.
59 * The open files table and it's size.
61 static struct file **_sysio_oftab = NULL;
62 static size_t _sysio_oftab_size = 0;
65 * Create and initialize open file record.
68 _sysio_fnew(struct inode *ino, int flags)
72 fil = malloc(sizeof(struct file));
76 _SYSIO_FINIT(fil, ino, flags);
83 * Destroy open file record.
86 _sysio_fgone(struct file *fil)
92 err = (*fil->f_ino->i_ops.inop_close)(fil->f_ino);
98 * IO operation completion handler.
101 _sysio_fcompletio(struct ioctx *ioctx, struct file *fil)
105 if (ioctx->ioctx_cc <= 0)
108 assert(ioctx->ioctx_ino == fil->f_ino);
109 off = fil->f_pos + ioctx->ioctx_cc;
110 if (fil->f_pos && off <= fil->f_pos)
116 * Grow (or truncate) the file descriptor table.
122 struct file **noftab, **filp;
125 * Sanity check the new size.
131 * We never shrink the table.
133 if (n <= _sysio_oftab_size)
136 noftab = realloc(_sysio_oftab, n * sizeof(struct file *));
139 _sysio_oftab = noftab;
140 count = _sysio_oftab_size;
141 _sysio_oftab_size = n;
142 filp = _sysio_oftab + count;
155 _sysio_oftab_size = 0;
160 * Find a free slot in the open files table greater than or equal to the
164 find_free_fildes(int low)
170 for (n = low, filp = _sysio_oftab + low;
171 n >= 0 && (unsigned )n < _sysio_oftab_size && *filp;
176 if ((unsigned )n >= _sysio_oftab_size) {
177 err = fd_grow((unsigned )n + 1);
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 (if forced), or any
220 * available file descriptor if less than zero, or any available descriptor
221 * greater than or equal to the given one if not forced.
224 _sysio_fd_set(struct file *fil, int fd, int force)
230 * Search for a free descriptor if needed.
232 if (fd < 0 || !force) {
235 fd = find_free_fildes(fd);
240 if ((unsigned )fd >= _sysio_oftab_size) {
241 err = fd_grow((unsigned )fd + 1);
249 ofil = _sysio_fd_find(fd);
253 _sysio_oftab[fd] = fil;
261 * Duplicate old file descriptor.
263 * If the new file descriptor is less than zero, the new file descriptor
264 * is chosen freely. Otherwise, choose an available descriptor greater
265 * than or equal to the new, if not forced. Otherwise, if forced, (re)use
269 _sysio_fd_dup(int oldfd, int newfd, int force)
277 fil = _sysio_fd_find(oldfd);
281 fd = _sysio_fd_set(fil, newfd, force);
288 _sysio_fd_close_all()
294 * Close all open descriptors.
296 for (fd = 0, filp = _sysio_oftab;
297 (size_t )fd < _sysio_oftab_size;
306 * Release current working directory.