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36 * @(#)rec_open.c 8.10 (Berkeley) 9/1/94
37 * $FreeBSD: src/lib/libc/db/recno/rec_open.c,v 1.4 2000/01/27 23:06:11 jasone Exp $
38 * $DragonFly: src/lib/libc/db/recno/rec_open.c,v 1.2 2003/06/17 04:26:42 dillon Exp $
41 #include <sys/types.h>
56 __rec_open(fname, flags, mode, openinfo, dflags)
58 int flags, mode, dflags;
59 const RECNOINFO *openinfo;
68 /* Open the user's file -- if this fails, we're done. */
69 if (fname != NULL && (rfd = _open(fname, flags, mode)) < 0)
72 /* Create a btree in memory (backed by disk). */
75 if (openinfo->flags & ~(R_FIXEDLEN | R_NOKEY | R_SNAPSHOT))
78 btopeninfo.cachesize = openinfo->cachesize;
79 btopeninfo.maxkeypage = 0;
80 btopeninfo.minkeypage = 0;
81 btopeninfo.psize = openinfo->psize;
82 btopeninfo.compare = NULL;
83 btopeninfo.prefix = NULL;
84 btopeninfo.lorder = openinfo->lorder;
85 dbp = __bt_open(openinfo->bfname,
86 O_RDWR, S_IRUSR | S_IWUSR, &btopeninfo, dflags);
88 dbp = __bt_open(NULL, O_RDWR, S_IRUSR | S_IWUSR, NULL, dflags);
93 * Some fields in the tree structure are recno specific. Fill them
94 * in and make the btree structure look like a recno structure. We
95 * don't change the bt_ovflsize value, it's close enough and slightly
100 if (openinfo->flags & R_FIXEDLEN) {
102 t->bt_reclen = openinfo->reclen;
103 if (t->bt_reclen == 0)
106 t->bt_bval = openinfo->bval;
112 F_SET(t, R_EOF | R_INMEM);
118 * In 4.4BSD, stat(2) returns true for ISSOCK on pipes.
119 * Unfortunately, that's not portable, so we use lseek
120 * and check the errno values.
123 if (lseek(rfd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE) {
124 switch (flags & O_ACCMODE) {
131 slow: if ((t->bt_rfp = fdopen(rfd, "r")) == NULL)
135 F_ISSET(t, R_FIXLEN) ? __rec_fpipe : __rec_vpipe;
137 switch (flags & O_ACCMODE) {
150 * Kluge -- we'd like to test to see if the file is too
151 * big to mmap. Since, we don't know what size or type
152 * off_t's or size_t's are, what the largest unsigned
153 * integral type is, or what random insanity the local
154 * C compiler will perpetrate, doing the comparison in
155 * a portable way is flatly impossible. Hope that mmap
156 * fails if the file is too large.
161 #ifdef MMAP_NOT_AVAILABLE
164 * Mmap doesn't work correctly on many current
165 * systems. In particular, it can fail subtly,
166 * with cache coherency problems. Don't use it
169 t->bt_msize = sb.st_size;
170 if ((t->bt_smap = mmap(NULL, t->bt_msize,
171 PROT_READ, MAP_PRIVATE, rfd,
172 (off_t)0)) == MAP_FAILED)
174 t->bt_cmap = t->bt_smap;
175 t->bt_emap = t->bt_smap + sb.st_size;
176 t->bt_irec = F_ISSET(t, R_FIXLEN) ?
177 __rec_fmap : __rec_vmap;
178 F_SET(t, R_MEMMAPPED);
186 /* Use the recno routines. */
187 dbp->close = __rec_close;
188 dbp->del = __rec_delete;
190 dbp->get = __rec_get;
191 dbp->put = __rec_put;
192 dbp->seq = __rec_seq;
193 dbp->sync = __rec_sync;
195 /* If the root page was created, reset the flags. */
196 if ((h = mpool_get(t->bt_mp, P_ROOT, 0)) == NULL)
198 if ((h->flags & P_TYPE) == P_BLEAF) {
201 mpool_put(t->bt_mp, h, MPOOL_DIRTY);
203 mpool_put(t->bt_mp, h, 0);
205 if (openinfo && openinfo->flags & R_SNAPSHOT &&
206 !F_ISSET(t, R_EOF | R_INMEM) &&
207 t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
211 einval: errno = EINVAL;
212 err: sverrno = errno;
214 (void)__bt_close(dbp);
229 /* Toss any page pinned across calls. */
230 if (t->bt_pinned != NULL) {
231 mpool_put(t->bt_mp, t->bt_pinned, 0);
235 /* In-memory database can't have a file descriptor. */
236 if (F_ISSET(t, R_INMEM)) {