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32 * @(#)rec_open.c 8.10 (Berkeley) 9/1/94
33 * $FreeBSD: src/lib/libc/db/recno/rec_open.c,v 1.4 2000/01/27 23:06:11 jasone Exp $
34 * $DragonFly: src/lib/libc/db/recno/rec_open.c,v 1.6 2005/11/19 20:46:32 swildner Exp $
37 #include "namespace.h"
38 #include <sys/types.h>
48 #include "un-namespace.h"
54 __rec_open(const char *fname, int flags, int mode, const RECNOINFO *openinfo,
66 /* Open the user's file -- if this fails, we're done. */
67 if (fname != NULL && (rfd = _open(fname, flags, mode)) < 0)
70 /* Create a btree in memory (backed by disk). */
73 if (openinfo->flags & ~(R_FIXEDLEN | R_NOKEY | R_SNAPSHOT))
76 btopeninfo.cachesize = openinfo->cachesize;
77 btopeninfo.maxkeypage = 0;
78 btopeninfo.minkeypage = 0;
79 btopeninfo.psize = openinfo->psize;
80 btopeninfo.compare = NULL;
81 btopeninfo.prefix = NULL;
82 btopeninfo.lorder = openinfo->lorder;
83 dbp = __bt_open(openinfo->bfname,
84 O_RDWR, S_IRUSR | S_IWUSR, &btopeninfo, dflags);
86 dbp = __bt_open(NULL, O_RDWR, S_IRUSR | S_IWUSR, NULL, dflags);
91 * Some fields in the tree structure are recno specific. Fill them
92 * in and make the btree structure look like a recno structure. We
93 * don't change the bt_ovflsize value, it's close enough and slightly
98 if (openinfo->flags & R_FIXEDLEN) {
100 t->bt_reclen = openinfo->reclen;
101 if (t->bt_reclen == 0)
104 t->bt_bval = openinfo->bval;
110 F_SET(t, R_EOF | R_INMEM);
116 * In 4.4BSD, stat(2) returns true for ISSOCK on pipes.
117 * Unfortunately, that's not portable, so we use lseek
118 * and check the errno values.
121 if (lseek(rfd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE) {
122 switch (flags & O_ACCMODE) {
129 slow: if ((t->bt_rfp = fdopen(rfd, "r")) == NULL)
133 F_ISSET(t, R_FIXLEN) ? __rec_fpipe : __rec_vpipe;
135 switch (flags & O_ACCMODE) {
145 if (_fstat(rfd, &sb))
148 * Kluge -- we'd like to test to see if the file is too
149 * big to mmap. Since, we don't know what size or type
150 * off_t's or size_t's are, what the largest unsigned
151 * integral type is, or what random insanity the local
152 * C compiler will perpetrate, doing the comparison in
153 * a portable way is flatly impossible. Hope that mmap
154 * fails if the file is too large.
159 #ifdef MMAP_NOT_AVAILABLE
162 * Mmap doesn't work correctly on many current
163 * systems. In particular, it can fail subtly,
164 * with cache coherency problems. Don't use it
167 t->bt_msize = sb.st_size;
168 if ((t->bt_smap = mmap(NULL, t->bt_msize,
169 PROT_READ, MAP_PRIVATE, rfd,
170 (off_t)0)) == MAP_FAILED)
172 t->bt_cmap = t->bt_smap;
173 t->bt_emap = t->bt_smap + sb.st_size;
174 t->bt_irec = F_ISSET(t, R_FIXLEN) ?
175 __rec_fmap : __rec_vmap;
176 F_SET(t, R_MEMMAPPED);
184 /* Use the recno routines. */
185 dbp->close = __rec_close;
186 dbp->del = __rec_delete;
188 dbp->get = __rec_get;
189 dbp->put = __rec_put;
190 dbp->seq = __rec_seq;
191 dbp->sync = __rec_sync;
193 /* If the root page was created, reset the flags. */
194 if ((h = mpool_get(t->bt_mp, P_ROOT, 0)) == NULL)
196 if ((h->flags & P_TYPE) == P_BLEAF) {
199 mpool_put(t->bt_mp, h, MPOOL_DIRTY);
201 mpool_put(t->bt_mp, h, 0);
203 if (openinfo && openinfo->flags & R_SNAPSHOT &&
204 !F_ISSET(t, R_EOF | R_INMEM) &&
205 t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
209 einval: errno = EINVAL;
210 err: sverrno = errno;
220 __rec_fd(const DB *dbp)
226 /* Toss any page pinned across calls. */
227 if (t->bt_pinned != NULL) {
228 mpool_put(t->bt_mp, t->bt_pinned, 0);
232 /* In-memory database can't have a file descriptor. */
233 if (F_ISSET(t, R_INMEM)) {